Schweitzer Engineering Laboratories, Inc.

United States of America

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IPC Class
G01R 31/08 - Locating faults in cables, transmission lines, or networks 31
H02H 3/00 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection 26
G01R 31/00 - Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere 14
G06F 19/00 - Digital computing or data processing equipment or methods, specially adapted for specific applications (specially adapted for specific functions G06F 17/00;data processing systems or methods specially adapted for administrative, commercial, financial, managerial, supervisory or forecasting purposes G06Q;healthcare informatics G16H) 9
H04L 29/06 - Communication control; Communication processing characterised by a protocol 9
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1.

VIRTUAL DISPLAY

      
Application Number US2021021686
Publication Number 2021/202068
Status In Force
Filing Date 2021-03-10
Publication Date 2021-10-07
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Iii, Edmund O.
  • Lee, Tony J.
  • Gubba Ravikumar, Krishnanjan
  • Nelms, Lisa Gayle

Abstract

The present disclosure pertains to systems and methods for generating a virtual display using a unidirectional communication channel. In one embodiment, a system may comprise a transmitting device including a processing subsystem to generate a representation of an encoded signal comprising information to be displayed on a virtual display. A virtual display transmission subsystem may transmit the encoded signal. A receiving device may comprise a virtual display reception subsystem to receive the encoded signal. A processing subsystem may extract the information to be displayed on the virtual display from the encoded signal and generate a representation of the virtual display. A virtual display subsystem may display the representation of the virtual display. The virtual display transmission subsystem and the virtual display reception subsystem may create a unidirectional communication channel from the transmitting device to the receiving device.

IPC Classes  ?

  • G09G 5/00 - Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators

2.

SDN FLOW PATH MODIFICATION BASED ON PACKET INSPECTION

      
Application Number US2021021634
Publication Number 2021/194748
Status In Force
Filing Date 2021-03-10
Publication Date 2021-09-30
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Kalra, Amandeep Singh
  • Dolezilek, David J.
  • Meine, Robert

Abstract

A network communication system may include intelligent electronic devices (IEDs) in a ring communication network. A software-defined networking device may be programmed by a removable or disconnectable software-defined network (SDN) controller to control the flow path of data packets to the IEDs in the ring network. The software-defined networking device may inspect a data packet intended for a first IED to determine that the inspected data packet requests a responsive data packet from the first IED. A flow path failure may be identified based on a failure to detect a responsive data packet from the first IED within an expected response time.

IPC Classes  ?

  • H04L 12/437 - Ring fault isolation or reconfiguration
  • H04L 12/43 - Loop networks with decentralised control with synchronous transmission, e.g. time division multiplex (TDM), slotted rings
  • H04W 24/08 - Testing using real traffic
  • G06F 8/20 - Software design
  • H04L 12/42 - Loop networks

3.

ELIMINATION OF ADDRESS RESOLUTION PROTOCOL

      
Application Number US2021018176
Publication Number 2021/183262
Status In Force
Filing Date 2021-02-16
Publication Date 2021-09-16
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Smith, Rhett
  • Dearien, Jason A.
  • Gammel, Dennis

Abstract

The present disclosure pertains to systems and methods for eliminating Address Resolution Protocol (ARP) traffic in data networks. In one embodiment, a controller in a software-defined network (SDN) may generate a plurality of communication flows. The controller may program a plurality of network devices in a data plane based on the plurality of communication flows. A packet to be transmitted in the data plane may be received from a transmitting host by one of the plurality of network devices. A destination host specified in the packet may be determined without reliance on an original media access control (MAC) address in the packet, and the packet may be routed to the destination host.

IPC Classes  ?

  • H04L 29/12 - Arrangements, apparatus, circuits or systems, not covered by a single one of groups characterised by the data terminal
  • H04L 12/00 - Data switching networks

4.

ELECTRIC POWER DISTRIBUTION SECTIONALIZING IN HIGH-RISK AREAS USING WIRELESS FAULT SENSORS

      
Application Number US2021020391
Publication Number 2021/178357
Status In Force
Filing Date 2021-03-02
Publication Date 2021-09-10
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Keckalo, David Walter
  • Hao, Kei

Abstract

Disclosed herein are systems and methods for safe electric power delivery protection within a high-risk area while maintaining electric power availability in non-faulted areas. Fault signals from wireless sensors are used at a recloser to block reclosing onto a faulted high-risk zone. Fault signals from wireless sensors are used at a recloser to permit reclosing when the reclosing operation will not close onto a fault location within the high-risk zone. Portions of the power system may be selectively openable by sectionalizers. When a fault is reported by a wireless sensor as being on a portion of the power system selectively openable, a recloser may be permitted to attempt a reclose operation affecting the high-risk zone and the selectively openable portion.

IPC Classes  ?

  • H02H 3/06 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection - Details with automatic reconnection
  • H02H 3/00 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection
  • H02H 3/02 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection - Details
  • H02H 3/08 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to excess current

5.

ELECTRIC POWER SYSTEM VOLTAGE MONITORING AND CONTROL WITH ENERGY PACKETS

      
Application Number US2021016794
Publication Number 2021/178104
Status In Force
Filing Date 2021-02-05
Publication Date 2021-09-10
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Iii, Edmund O.
  • Zweigle, Gregary C.
  • Blood, Ellery A.

Abstract

Electric power system voltage control and voltage stability may be calculated using energy packets. Sets of negative energy packet sets normalized by a set of positive and negative energy packet sets may be used for voltage control by adding or removing capacitive units. Energy packet voltage indicators may be calculated using energy packets, and used to determine voltage stability. Control actions may be taken depending on the determined voltage stability.

IPC Classes  ?

  • G01R 21/00 - Arrangements for measuring electric power or power factor
  • G01D 4/00 - Tariff metering apparatus
  • G06Q 50/06 - Electricity, gas or water supply
  • H02J 3/00 - Circuit arrangements for ac mains or ac distribution networks

6.

CONTROL PANEL MODULE ASSEMBLY DEVICES AND TECHNIQUES

      
Application Number US2021019884
Publication Number 2021/173980
Status In Force
Filing Date 2021-02-26
Publication Date 2021-09-02
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Alzate, Julian M.
  • Soller, Cameron Scott
  • Gentry, Bryan
  • Hildenbrand, Kyle Ellis

Abstract

Systems, apparatus, methods, and techniques of assembly of discrete modules of a control panel are disclosed. The modules can be independently wired, tested, and installed into a control panel. Module definitions are defined specifying components to perform the electrical function, a mechanical arrangement of the components, electrical connections, and logical interactions of the module. A bill of materials can be generated based on a designation of a set of modules for a control panel and the module definitions. Modularly assembled control panels are disclosed. An assembly frame is described herein for temporarily mounting components of a module for independent assembly of a control module and for eventual removal and installation into a control panel frame. The assembly frame may include a faceplate frame and side frames and temporary mounting features.

IPC Classes  ?

  • G06F 1/18 - Packaging or power distribution
  • E04H 5/02 - Buildings or groups of buildings for industrial purposes, e.g. for power-plants or factories
  • E04H 5/04 - Transformer houses; Substations or switchgear houses
  • H05K 7/14 - Mounting supporting structure in casing or on frame or rack
  • H05K 7/18 - Construction of rack or frame

7.

FIRE RISK MITIGATION IN ELECTRIC POWER SYSTEMS

      
Application Number US2021016791
Publication Number 2021/173324
Status In Force
Filing Date 2021-02-05
Publication Date 2021-09-02
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Wade, Austin Edward
  • Gubba Ravikumar, Krishnanjan

Abstract

Systems and methods may mitigate risk of fire caused by an electric power system. In one embodiment, a system may include an intelligent electronic device (IED). The IED includes a communication subsystem to receive a signal from a sensor related to a condition of the electric conductor. A processing subsystem in communication with the communication subsystem may operate in at least two modes comprising a high security mode and a fire prevention mode. In the fire prevention mode, the IED may interrupt a flow of electric current based on the signal from the at least one sensor associated with the electric conductor. In the high security mode, the system may interrupt a flow of electric current based on the signal from the at least one sensor associated with the electric conductor and based on a second condition relating to the electric conductor.

IPC Classes  ?

  • G01R 31/08 - Locating faults in cables, transmission lines, or networks
  • G01R 31/50 - Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
  • G01R 31/52 - Testing for short-circuits, leakage current or ground faults
  • G01R 31/54 - Testing for continuity
  • G01R 31/58 - Testing of lines, cables or conductors

8.

MODULARLY ASSEMBLED CONTROL PANELS

      
Application Number US2021019894
Publication Number 2021/173990
Status In Force
Filing Date 2021-02-26
Publication Date 2021-09-02
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Barber, Michael
  • Thompson, Michael J.
  • Corwin, Beth Larae
  • Alzate, Julian M.
  • Jayne, Robert I.

Abstract

Systems, apparatus, methods, and techniques of assembly of discrete modules of a control panel are disclosed. The modules can be independently wired, tested, and installed into a control panel. Module definitions are defined specifying components to perform the electrical function, a mechanical arrangement of the components, electrical connections, and logical interactions of the module. A bill of materials can be generated based on a designation of a set of modules for a control panel and the module definitions. Modularly assembled control panels are disclosed. An assembly frame is described herein for temporarily mounting components of a module for independent assembly of a control module and for eventual removal and installation into a control panel frame. The assembly frame may include a faceplate frame and side frames and temporary mounting features.

IPC Classes  ?

  • G06F 1/18 - Packaging or power distribution
  • E04H 5/02 - Buildings or groups of buildings for industrial purposes, e.g. for power-plants or factories
  • E04H 5/04 - Transformer houses; Substations or switchgear houses
  • H05K 7/14 - Mounting supporting structure in casing or on frame or rack
  • H05K 7/18 - Construction of rack or frame

9.

CONTROL PANEL ASSEMBLY METHODS AND TECHNIQUES

      
Application Number US2021019898
Publication Number 2021/173993
Status In Force
Filing Date 2021-02-26
Publication Date 2021-09-02
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Barber, Michael
  • Alzate, Julian M.
  • Jayne, Robert I.

Abstract

Systems, apparatus, methods, and techniques of assembly of discrete modules of a control panel are disclosed. The modules can be independently wired, tested, and installed into a control panel. Module definitions are defined specifying components to perform the electrical function, a mechanical arrangement of the components, electrical connections, and logical interactions of the module. A bill of materials can be generated based on a designation of a set of modules for a control panel and the module definitions. Modularly assembled control panels are disclosed. An assembly frame is described herein for temporarily mounting components of a module for independent assembly of a control module and for eventual removal and installation into a control panel frame. The assembly frame may include a faceplate frame and side frames and temporary mounting features.

IPC Classes  ?

  • G06F 1/18 - Packaging or power distribution
  • E04H 5/02 - Buildings or groups of buildings for industrial purposes, e.g. for power-plants or factories
  • E04H 5/04 - Transformer houses; Substations or switchgear houses
  • H05K 7/14 - Mounting supporting structure in casing or on frame or rack
  • H05K 7/18 - Construction of rack or frame

10.

SYSTEMS, METHODS AND APPARATUSES FOR FREQUENCY TRACKING

      
Application Number US2020053355
Publication Number 2021/076322
Status In Force
Filing Date 2020-09-30
Publication Date 2021-04-22
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Manson, Scott, M.
  • Blood, Ellery, A.
  • Zweigle, Gregary, C.

Abstract

A frequency tracking system may use shaft speed and electrical frequency to estimate a frequency of a monitored machine. The frequency tracking system may convert shaft speed to a mechanical frequency and blend the electrical frequency and the mechanical frequency together to determine an estimated frequency. The frequency tracking system may blend the frequencies based on an operating state of the monitored machine and the frequency sensors.

IPC Classes  ?

  • G01D 5/34 - Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using optical means, i.e. using infrared, visible or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
  • H02K 11/25 - Devices for sensing temperature, or actuated thereby
  • H02P 29/024 - Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load

11.

SECURE CONTROL OF INTELLIGENT ELECTRONIC DEVICES IN POWER DELIVERY SYSTEMS

      
Application Number US2020053743
Publication Number 2021/076339
Status In Force
Filing Date 2020-10-01
Publication Date 2021-04-22
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Gammel, Dennis
  • Powers, Josh
  • Dearien, Jason A.
  • Pereyda, Joshua Thomas

Abstract

Systems and methods are disclosed herein relating to the secure configuration of intelligent electronic devices. Intelligent electronic devices are used in electric power generation and transmission systems for protection, control, automation, and/or monitoring of equipment. The use of tokens and token-based digital signatures in the configuration process of intelligent electronic devices reduces the likelihood of malicious acts or unintended errors. Tokens distributed to engineers, technicians, intelligent electronic devices, computing devices, and/or software decrease the likelihood of errors being introduced in the configuration process.

IPC Classes  ?

  • H04W 12/06 - Authentication
  • H04W 12/08 - Access security
  • H04L 9/32 - Arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system
  • G06F 21/62 - Protecting access to data via a platform, e.g. using keys or access control rules

12.

ELECTRICAL ARC EVENT DETECTION IN AN ELECTRIC POWER SYSTEM

      
Application Number US2020053175
Publication Number 2021/076314
Status In Force
Filing Date 2020-09-29
Publication Date 2021-04-22
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Iii, Edmund O.
  • Whitehead, David E.
  • Casebolt, David J.
  • Gubba Ravikumar, Krishnanjan
  • Wade, Austin Edward
  • Nelms, Lisa Gayle

Abstract

The present disclosure pertains to systems and methods for monitoring electrical arc events in an electric power system. In one embodiment, a system may comprise an arc flash detection (AFD) unit to detect electromagnetic radiation generated by an electrical arc event, a primary protection relay to generate measurements of an electric current, and an integrator. In various embodiments, the integrator may comprise a communication port to receive the detection of the electrical arc event and the measurements of the electric current. The integrator may also comprise a processing subsystem to validate the detection of the electrical arc and generate protective actions to interrupt the flow of the current to the electrical arc event.

IPC Classes  ?

  • G01R 31/08 - Locating faults in cables, transmission lines, or networks
  • G01R 31/12 - Testing dielectric strength or breakdown voltage

13.

RELIABLE POWER MODULE FOR IMPROVED SUBSTATION DEVICE AVAILABILITY

      
Application Number US2020053356
Publication Number 2021/076323
Status In Force
Filing Date 2020-09-30
Publication Date 2021-04-22
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Iii, Edmund O.
  • Whitehead, David E.
  • Lee, Tony J.
  • Casebolt, David J.
  • Gubba Ravikumar, Krishnanjan
  • Wade, Austin Edward
  • Hall, Bruce A.
  • Loughlin, Kelsey M.
  • Robertson, Sean D.

Abstract

Disclosed herein are systems for maintaining protection of electric power delivery systems in the event of a control power failure or other anomaly. A reliable power module conditions electric power from multiple independent sources and provides electrical operational power to electric power delivery system protective loads. The reliable power module includes a power storage device for providing operational power even upon loss of all control power sources. The power storage may be sufficient to ride through expected losses such as a time to start up backup generation. The power storage may be sufficient to power a trip coil. Thus, electric power system protection is maintained even upon loss of control power.

IPC Classes  ?

  • H02J 9/04 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
  • H02H 3/00 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection
  • H02J 4/00 - Circuit arrangements for mains or distribution networks not specified as ac or dc
  • H02J 9/00 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting

14.

TOKEN-BASED DEVICE ACCESS RESTRICTION SYSTEMS

      
Application Number US2020053744
Publication Number 2021/076340
Status In Force
Filing Date 2020-10-01
Publication Date 2021-04-22
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Gammel, Dennis
  • Powers, Josh
  • Dearien, Jason A.
  • Pereyda, Joshua Thomas

Abstract

The present disclosure pertains to systems and methods of restricting access to devices utilizing tokens. In some embodiments, a system may include a user requesting a token, ensuring the user requesting a token has the permission to request the token and is not the user approving the token. In some embodiments, the system may include the user granting the token, wherein the user granting the token is not the user receiving the token. The system ensures that the user accessing the device has the permission to access the device. Additionally, the system decreases the opportunities for insider attacks and increases the resistance to credential theft attacks. Further, the system increases the accountability for changes and the ability to review changes.

IPC Classes  ?

  • G06F 1/28 - Supervision thereof, e.g. detecting power-supply failure by out of limits supervision
  • G06F 1/26 - Power supply means, e.g. regulation thereof
  • G06F 21/33 - User authentication using certificates
  • H04L 9/32 - Arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system
  • H04W 12/08 - Access security
  • H04L 9/08 - Key distribution
  • H04L 29/06 - Communication control; Communication processing characterised by a protocol

15.

TOKEN-BASED DEVICE ACCESS RESTRICTIONS BASED ON SYSTEM UPTIME

      
Application Number US2020053745
Publication Number 2021/076341
Status In Force
Filing Date 2020-10-01
Publication Date 2021-04-22
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Gammel, Dennis
  • Powers, Josh
  • Dearien, Jason A.
  • Pereyda, Joshua Thomas

Abstract

Systems and methods are described herein for token-based access to an intelligent electronic device (IED) resource in a power delivery system. A token server and an IED resource may be communicatively connected via a communication network. The token server may generate a token associated with access privileges to one or more IED resources. The token server associates an access duration time with the generated token. The user presents the IED resource with the token as part of an access attempt. The IED resource grants access at a first time defined with reference to the device uptime of the IED resource until a second time defined with reference to the device up time. The difference between the first time and the second time corresponds to the access duration time of the token.

IPC Classes  ?

  • H04L 9/32 - Arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system

16.

ENERGY PACKET CONTROL OF GENERATOR PRIME MOVER

      
Application Number US2020055250
Publication Number 2021/076449
Status In Force
Filing Date 2020-10-12
Publication Date 2021-04-22
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Iii, Edmund O.
  • Zweigle, Gregary C.
  • Blood, Ellery A.
  • Manson, Scott M.

Abstract

A controller may use energy packets to control a prime mover of a machine. The controller may include an energy packet measurement control to calculate energy packets and convert the energy packets into a fuel valve reference. Further, a frequency control may receive system feedback associated with the monitored machine and generate a frequency correction based on the system feedback. The controller may add the energy packet value and the frequency correction to determine a prime mover power reference and provide the prime mover power reference to a fuel valve control of the machine.

IPC Classes  ?

  • F01B 25/06 - Sensing elements responsive to speed
  • F01D 17/06 - Arrangement of sensing elements responsive to speed
  • F15B 11/04 - Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member for controlling the speed

17.

PRIMARY AND SYSTEM PROTECTION FOR AN ELECTRIC POWER DELIVERY SYSTEM

      
Application Number US2020053742
Publication Number 2021/071734
Status In Force
Filing Date 2020-10-01
Publication Date 2021-04-15
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Iii, Edmund O.
  • Whitehead, David E.
  • Lee, Tony J.
  • Gubba Ravikumar, Krishnanjan

Abstract

Primary protection relays and an integrator disclosed for providing primary protection and secondary applications for an electric power delivery system. The primary protection relays obtain signals from, and provide primary protection operations for the power system, and may operate independently from the integrator. An integrator receives signals and status communications from the primary protection relays to perform secondary applications for the electric power delivery system. The secondary applications may include backup protection, system protection, interconnected protection, and automation functions.

IPC Classes  ?

  • G06F 1/30 - Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations
  • H02H 3/093 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to excess current with timing means
  • H02H 3/10 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to excess current additionally responsive to some other abnormal electrical conditions
  • H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over
  • H02J 9/04 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
  • H02J 9/02 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which an auxiliary distribution system and its associated lamps are brought into service
  • H01H 7/00 - Devices for introducing a predetermined time delay between the initiation of the switching operation and the opening or closing of the contacts

18.

HIGH-IMPEDANCE FAULT DETECTION USING WIRELESS CURRENT TRANSFORMERS

      
Application Number US2020052785
Publication Number 2021/071683
Status In Force
Filing Date 2020-09-25
Publication Date 2021-04-15
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Fischer, Normann
  • Rice, Raymond W.
  • Mulpuri, Ravindra P.
  • Mobley, James

Abstract

The present disclosure pertains to systems and methods for monitoring and protecting an electric power system. In one embodiment, a system may comprise line-mounted wireless current transformers to measure at least one parameter of an alternating current (AC), receive a synchronization signal at which to measure the AC, and send a message comprising the measured AC. The system may also comprise an intelligent electronic device (IED) to send the synchronization signal to and receive the messages from the line-mount wireless current transformers, determine whether a high-impedance fault (HiZ) exists between the line-mounted wireless current transformers, and implement a control action based on the existence of the HiZ fault.

IPC Classes  ?

  • H02H 3/00 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection
  • G01R 31/08 - Locating faults in cables, transmission lines, or networks
  • H02H 3/08 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to excess current
  • H02J 13/00 - Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
  • G01R 31/00 - Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere

19.

MULTIPLE MERGING UNIT TESTING SYSTEM

      
Application Number US2020052788
Publication Number 2021/071684
Status In Force
Filing Date 2020-09-25
Publication Date 2021-04-15
Owner SCHWEITZER ENGINEERING LABORATORIES, INC (USA)
Inventor
  • Schweitzer, Iii, Edmund O.
  • Whitehead, David E.
  • Gubba Ravikumar, Krishnanjan
  • Wade, Austin Edward

Abstract

Systems and methods testing a power protection relay include a merging unit to receive signals from an electric power delivery system. The merging unit includes a test signal input to receive test signals from a testing device, a relay output to output at least one of the test signals to a power protection relay, a distribution output to output at least another of the test signals to one or more additional merging units, and a switch subsystem to route the test signal to the relay output or the distribution output.

IPC Classes  ?

  • H02H 1/00 - EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS - Details of emergency protective circuit arrangements
  • H02H 3/00 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection
  • G01R 21/133 - Arrangements for measuring electric power or power factor by using digital technique
  • G01R 21/00 - Arrangements for measuring electric power or power factor

20.

TESTING DEVICE FOR PROTECTIVE RELAYS IN ELECTRIC POWER DELIVERY SYSTEMS

      
Application Number US2020053174
Publication Number 2021/071693
Status In Force
Filing Date 2020-09-29
Publication Date 2021-04-15
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Iii, Edmund O.
  • Whitehead, David E.
  • Lee, Tony J.
  • Casebolt, David J.
  • Gubba Ravikumar, Krishnanjan
  • Schmidt, David
  • Wade, Austin Edward

Abstract

Systems and methods for testing a protection relay, such as a primary bus protection relay, may include a testing device for providing current signals imitating current on both sides of a bus to the primary bus protection relay. The signals may be provided using signals corresponding with a signal format from merging units or other monitoring devices. The testing device may be configured to receive communications from the primary bus protection relay for evaluation of the operation of the primary bus protection relay.

IPC Classes  ?

  • G01R 31/327 - Testing of circuit interrupters, switches or circuit-breakers

21.

ELECTRIC POWER SYSTEM TRANSDUCER FAILURE MONITOR AND MEASUREMENT RECOVERY

      
Application Number US2020053713
Publication Number 2021/071731
Status In Force
Filing Date 2020-10-01
Publication Date 2021-04-15
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Iii, Edmund O.
  • Hou, Daqing
  • Whitehead, David E.
  • Lee, Tony J.
  • Gubba Ravikumar, Krishnanjan

Abstract

Systems and methods including improving availability of protection of an electric power delivery system even upon unavailability of power system signals. Such protection relays may provide protection using signals from the power system and provide the signals to an integrator or another device. Upon unavailability of power system signals to a protection relay, the integrator sends substitute power system signals may be provided to the protection relay. The protection relay may continue to provide protection using the substitute power system signals.

IPC Classes  ?

  • G01R 31/08 - Locating faults in cables, transmission lines, or networks
  • G06F 11/07 - Responding to the occurrence of a fault, e.g. fault tolerance
  • H04L 12/26 - Monitoring arrangements; Testing arrangements
  • H04L 29/06 - Communication control; Communication processing characterised by a protocol

22.

SECURE ELECTRIC POWER DELIVERY SYSTEM PROTECTION DURING CYBER THREATS

      
Application Number US2020041185
Publication Number 2021/011258
Status In Force
Filing Date 2020-07-08
Publication Date 2021-01-21
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Edmund, O., Iii
  • Gubba Ravikumar, Krishnanjan
  • Wade, Austin, Edward
  • Lee, Tony, J.
  • Casebolt, David, J.
  • Whitehead, David, E.

Abstract

Systems and methods may maintain protection of electric power delivery systems in the event of an attack on protection and/or control features of the power system. Primary protective functions may be physically isolated from other functions in primary protection relays. Integrators may facilitate non-primary protection functions and disconnect all communication with primary protection relays in the event of an attack. Primary protection relays maintain protection functions even during the attack or unavailability of the integrators.

IPC Classes  ?

  • H02H 7/26 - Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occurred
  • G06F 21/56 - Computer malware detection or handling, e.g. anti-virus arrangements

23.

CONDUCTIVE COOLING FOR SMALL FORM-FACTOR PLUGGABLE (SFP) FIBER OPTIC TRANSCEIVERS

      
Application Number US2020014754
Publication Number 2020/190368
Status In Force
Filing Date 2020-01-23
Publication Date 2020-09-24
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor Watts, Steven

Abstract

The present disclosure relates to conductive cooling of a small form-factor pluggable (SFP) transceiver. For example, an SFP transceiver assembly may include a cooling block and a thermally conductive pad having a thermally conductive material. The SFP transceiver assembly may include a spring finger that contacts the thermally conductive pad while the SFP transceiver is inserted into the SFP transceiver assembly to allow heat to be conducted from the SFP transceiver to the cooling block via the thermally conductive pad to conductively cool the SFP transceiver.

IPC Classes  ?

  • G02B 6/38 - Mechanical coupling means having fibre to fibre mating means
  • G02B 6/42 - Coupling light guides with opto-electronic elements

24.

DETECTING AND DETERRING NETWORK ATTACKS

      
Application Number US2019054035
Publication Number 2020/081227
Status In Force
Filing Date 2019-10-01
Publication Date 2020-04-23
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Kalra, Amandeep Singh
  • Dolezilek, David J.

Abstract

The disclosure pertains to detecting a network attack. In one embodiment, a first device may receive a high-precision time signal and may use the signal to associate a first time stamp with each of a plurality of data packets reflecting a time that each data packet is transmitted. A second device may receive the plurality of data packets from the first device via a data network. The second device may also receive the high-precision time signal and may use the signal to associate a second time stamp with each of the plurality of data packets reflecting a time that each data packet is received. A time of flight may be determined based on the first time stamp and the second time stamp. The second device may determine whether the time of flight for each of the first plurality of data packets is consistent with a time of flight.

IPC Classes  ?

  • H04L 12/24 - Arrangements for maintenance or administration

25.

SINGLE-END TRAVELING WAVE FAULT LOCATION USING LINE-MOUNTED DEVICE

      
Application Number US2019054029
Publication Number 2020/076556
Status In Force
Filing Date 2019-10-01
Publication Date 2020-04-16
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Edmund O., Iii
  • Rice, Raymond W.

Abstract

A line-mounted device is used to provide power system signals to a device for detecting a fault and calculating a fault location using a traveling wave launched thereby. Current at the line-mounted device is used to separate incident and reflected traveling waves at a terminal. Times and polarities of traveling waves passing the line-mounted device and the terminal are compared to determine if the fault is located between the terminal and line-mounted device or at a location beyond the terminal or line-mounted device. Voltage of the traveling wave may be calculated using currents from the line-mounted device.

IPC Classes  ?

  • G01R 31/02 - Testing of electric apparatus, lines, or components for short-circuits, discontinuities, leakage, or incorrect line connection
  • G01R 31/11 - Locating faults in cables, transmission lines, or networks using pulse-reflection methods

26.

ELECTRIC POWER SYSTEM PRICING WITH ENERGY PACKETS

      
Application Number US2019054180
Publication Number 2020/072570
Status In Force
Filing Date 2019-10-02
Publication Date 2020-04-09
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Edmund O., Iii
  • Whitehead, David E.
  • Zweigle, Gregary C.
  • Jacobsen, Dallas J.

Abstract

Calculation of a value of energy passing a point of an electric power delivery system, and price associated with the value is disclosed herein. Use of energy packets according with the embodiments of this disclosure more accurately represents the amount of energy produced and consumed by equipment. Energy packets may be calculated over one or more phases, over configurable time periods. Energy packets may be used in conjunction with a monetary rate to calculate the price for billing an energy consumer or crediting an energy producer.

IPC Classes  ?

  • H02J 3/00 - Circuit arrangements for ac mains or ac distribution networks
  • G01R 22/10 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
  • G01R 22/06 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods

27.

DISTANCE PROTECTION OF ELECTRIC POWER DELIVERY SYSTEMS USING TIME DOMAIN AND FREQUENCY DOMAIN

      
Application Number US2019033694
Publication Number 2020/055461
Status In Force
Filing Date 2019-05-23
Publication Date 2020-03-19
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Kasztenny, Bogdan Z.
  • Mynam, Mangapathirao Venkata
  • Daniels, Chadburn Troy

Abstract

Distance protection of electric power delivery systems are disclosed herein where a fault within a zone of protection is detected using time-domain fault detection supervised by frequency-domain fault detection. The distance fault detection may be asserted when the real or imaginary parts of the time-domain operating and polarizing quantities are both positive or both negative and an angle between the frequency domain operating and polarizing quantities is within a predetermined range. Additional security may be provided using a level check, a sign consistency check, or a disturbance detector.

IPC Classes  ?

  • G01R 31/08 - Locating faults in cables, transmission lines, or networks
  • G01R 19/25 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
  • G01R 29/18 - Indicating phase sequence; Indicating synchronism
  • H02H 3/00 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection
  • H02H 7/26 - Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occurred
  • H04B 3/46 - Monitoring; Testing

28.

DETECTION OF LOW-ENERGY EVENTS IN AN ELECTRIC POWER SYSTEM

      
Application Number US2019048103
Publication Number 2020/046796
Status In Force
Filing Date 2019-08-26
Publication Date 2020-03-05
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Edmund O., Iii
  • Guzman-Casillas, Armando
  • Skendzic, Veselin
  • Mynam, Mangapathirao Venkata
  • Kasztenny, Bogdan, Z.

Abstract

The present disclosure relates to determining locations of low-energy events on power lines. For example, an IED may receiving an input signal indicating a local electrical condition of a power line. The IED may detect traveling waves on the power line based on the local electrical condition. The IED may detect traveling waves on the power line based on the local and remote electrical conditions. The IED may determine that the traveling waves are associated with a low-energy event. The IED may determine the location of the low-energy event on the power line based at least in part on the traveling waves.

IPC Classes  ?

  • G01D 4/00 - Tariff metering apparatus
  • G01R 22/10 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques

29.

TIME-BASED NETWORK OPERATION PROFILES IN A SOFTWARE-DEFINED NETWORK

      
Application Number US2019018424
Publication Number 2019/173039
Status In Force
Filing Date 2019-02-18
Publication Date 2019-09-12
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Gammel, Dennis
  • Smith, Rhett

Abstract

A software-defined network controller (SDN controller) defines a first network flow to be selectively implemented by a networking device according to a first network operation profile. The SDN controller defines a second network flow to be selectively implemented by the networking device according to a second network operation profile. The first and second network operation profiles are stored within a memory of the networking device to be selectively implemented during different time periods based on a precision time input via a precision time input port on the networking device. In some embodiments, the networking device may detect a network event and implement a network operation profile for a preset time period based on the precision time input.

IPC Classes  ?

  • H04B 3/00 - Line transmission systems
  • H04L 7/10 - Arrangements for initial synchronisation
  • H04L 12/26 - Monitoring arrangements; Testing arrangements
  • H04L 29/06 - Communication control; Communication processing characterised by a protocol

30.

EVENT-BASED FLOW CONTROL IN SOFTWARE-DEFINED NETWORKS

      
Application Number US2019018425
Publication Number 2019/173040
Status In Force
Filing Date 2019-02-18
Publication Date 2019-09-12
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Gammel, Dennis
  • Smith, Rhett

Abstract

A software-defined network controller (SDN controller) defines a first network flow to be selectively implemented by a networking device according to a first network operation profile. The SDN controller defines a second network flow to be selectively implemented by the networking device according to a second network operation profile. A memory device of the networking device may store at least first and second network operation profiles for selective implementation during defined event windows. The event window(s) may be defined by start event inputs and stop event inputs. The event inputs may include, without limitation, a combination of parameter-based inputs and/or temporal inputs. In one specific embodiment, the networking device detects a network event and modifies a network operation profile for a preset time period and/or until an interrupt or stop event is detected.

IPC Classes  ?

31.

TRIGGER ALARM ACTIONS AND ALARM-TRIGGERED NETWORK FLOWS IN SOFTWARE-DEFINED NETWORKS

      
Application Number US2019018426
Publication Number 2019/173041
Status In Force
Filing Date 2019-02-18
Publication Date 2019-09-12
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Gammel, Dennis
  • Smith, Rhett

Abstract

A software-defined network controller (SDN controller) defines a first network flow to be selectively implemented by a networking device according to a first network operation profile. The SDN controller defines a second network flow to be selectively implemented by the networking device according to a second network operation profile. A memory device of the networking device may store at least first and second network operation profiles for selective implementation based on network packet characteristic matching and/or a "trigger alarm" event. The first network operation profile is implemented when an incoming network packet matches a pre-defined and/or customizable network packet characteristic match template. The second network operation profile is implemented when a "trigger alarm" event is received. A network operation profile may execute a write action to latch, or otherwise trigger, a physical alarm of a networking device or associated device.

IPC Classes  ?

  • H04L 12/56 - Packet switching systems
  • H04L 29/06 - Communication control; Communication processing characterised by a protocol
  • H04W 24/00 - Supervisory, monitoring or testing arrangements
  • H04W 28/12 - Flow control using signalling between network elements

32.

SELECTIVE PORT MIRRORING AND IN-BAND TRANSPORT OF NETWORK COMMUNICATIONS FOR INSPECTION

      
Application Number US2019016875
Publication Number 2019/168640
Status In Force
Filing Date 2019-02-06
Publication Date 2019-09-06
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Dearien, Jason A.
  • Smith, Rhett
  • Meine, Robert

Abstract

The present disclosure pertains to systems and methods of monitoring communication devices and communication links in a software-defined network (SDN). Network packets may be colored or tagged for routing to a packet analyzer. A VLAN bitmask may be added to a packet to identify the packet for inspection and, optionally, provide origin information identify a switch and/or port of origin. Port mirroring may be utilized and/or eventual routing of network packets to their original destination may ensure that network traffic is not disrupted. In one example, a most significant bit of a VLAN bitmask may be used by a match rule to identify packets intended for a packet analyzer without regard to original packet routing instructions and/or packet content.

IPC Classes  ?

  • H04L 29/08 - Transmission control procedure, e.g. data link level control procedure
  • H04L 29/06 - Communication control; Communication processing characterised by a protocol
  • H04L 12/46 - Interconnection of networks

33.

TRAFFIC ACTIVITY-BASED SIGNALING TO ADJUST FORWARDING BEHAVIOR OF PACKETS

      
Application Number US2019015689
Publication Number 2019/168624
Status In Force
Filing Date 2019-01-29
Publication Date 2019-09-06
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Smith, Rhett
  • Meine, Robert

Abstract

The present disclosure pertains to systems and methods of monitoring communication devices and communication links in a software defined network (SDN). In one embodiment, a system may include a communications interface configured to receive a plurality of ingress packets. A forwarding subsystem may match a subset of the plurality of ingress packets with the data flow and forwarding the subset of the plurality of ingress packets based on a first instruction set associated with the data flow. A statistical information subsystem may update a meter count associated with the subset of the plurality of ingress packets matched with the data flow. A logic engine configured to determine that the meter count fails to satisfy a threshold, change a port link state based on the failure to satisfy the threshold; and transition from the first instruction set to a second instruction set associated with the flow data.

IPC Classes  ?

  • H02H 7/20 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from norm for electronic equipment
  • H04L 12/26 - Monitoring arrangements; Testing arrangements
  • H04L 12/721 - Routing procedures, e.g. shortest path routing, source routing, link state routing or distance vector routing
  • H04L 12/725 - Selecting a path with suitable quality of service [QoS]
  • H04L 12/851 - Traffic type related actions, e.g. QoS or priority
  • H04L 12/859 - Flow control actions based on the nature of the application, e.g. controlling web browsing or e-mail traffic

34.

OVEREXCITATION PROTECTION FOR ELECTRIC POWER SYSTEM EQUIPMENT

      
Application Number US2019016876
Publication Number 2019/168641
Status In Force
Filing Date 2019-02-06
Publication Date 2019-09-06
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Chowdhury, Ritwik
  • Finney, Dale S.

Abstract

Disclosed are systems and methods to determine an overexcitation condition on electric power delivery system equipment that includes a magnetizing core. Overexcitation conditions are determined even during sub-synchronous resonance, ferro-resonance, and other complex events. Power system voltage is integrated and normalized to determine a flux on the magnetizing core. The flux is compared with a protection model to determine the overexcitation condition on the magnetizing core. Once an overexcitation condition is detected, a protective action may be taken to remove power from the effected power delivery system equipment.

IPC Classes  ?

  • G01R 19/165 - Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
  • G01R 19/25 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
  • H02H 7/045 - Differential protection of transformers
  • H02K 3/44 - Protection against moisture or chemical attack; Windings specially adapted for operation in liquid or gas
  • H02P 9/10 - Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load

35.

POINT ON WAVE SWITCHING USING SLOW SPEED PROCESSING

      
Application Number US2019014464
Publication Number 2019/160650
Status In Force
Filing Date 2019-01-22
Publication Date 2019-08-22
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor Haes, Dennis

Abstract

An intelligent electronic device (IED) may provide point on wave switching. The IED may receive a control operation request, and determine when to issue a control command to cause a switch to change positions. The actuation of the switch may occur at a target point on an alternating current. An IED may have a processor that is too slow to implement a switch when a desired point on an alternating current first occurs. Accordingly, some embodiments may compensate for the processing speed of an IED by determining a number of processor cycles needed (in advance) to issue a control command so that the resulting action results in the desired point on wave open or close.

IPC Classes  ?

  • H02B 13/035 - Gas-insulated switchgear
  • H01H 11/00 - Apparatus or processes specially adapted for the manufacture of electric switches

36.

ELECTRIC POWER GENERATOR SELECTION, SHEDDING, AND RUNBACK FOR POWER SYSTEM STABILITY

      
Application Number US2019014310
Publication Number 2019/156797
Status In Force
Filing Date 2019-01-18
Publication Date 2019-08-15
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Gubba Ravikumar, Krishnanjan
  • Armstrong, Benjamin E.
  • Kazmi, Maaz Syed Muhammad

Abstract

The present disclosure provides systems and methods for managing an electric power delivery system. The systems and methods may limit generated power of the power delivery system from surpassing a load demand, in order to avoid system instability. The systems and methods may receive an excess generation value and manage generators to runback and/or shed to maintain excess generation below a threshold. The systems and methods may determine a plurality of generator groups for runback. The runback capacity of the generators may be compared against the excess generation. If the excess generation is not greater than the runback capacity, the systems and methods may select generator groups until the runback capacity of the selected groups is greater than the excess generation, and may runback those generators according to runback set points. The unselected generators may continue normal operation to be available for another runback request.

IPC Classes  ?

  • H02J 3/06 - Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
  • H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers
  • H02J 3/46 - Controlling the sharing of output between the generators, converters, or transformers
  • H02J 3/14 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
  • H02P 9/02 - Arrangements for controlling electric generators for the purpose of obtaining a desired output - Details

37.

SECURE TRAVELING WAVE DISTANCE PROTECTION IN AN ELECTRIC POWER DELIVERY SYSTEM

      
Application Number US2018052196
Publication Number 2019/060706
Status In Force
Filing Date 2018-09-21
Publication Date 2019-03-28
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Edmund O., Iii
  • Kasztenny, Bogdan Z.

Abstract

The present disclosure pertains to systems and methods for monitoring traveling waves in an electric power system. In various embodiments, a data acquisition subsystem may acquire electric power system signals. A traveling wave detection subsystem may detect two or more traveling waves based on the electric power system signals and determine a location of an event triggering the traveling waves. A traveling wave security subsystem may selectively generate a restraining signal based on the location of the event as within a blocking zone. A protection action subsystem may implement a protective action when the location is outside of a blocking zone. In various embodiments, a protective action will not be implemented for traveling waves launched from known locations of switching devices operating normally. Further, protective actions may be restrained if a magnitude of a traveling wave differs from an expected value based on a pre-fault voltage.

IPC Classes  ?

  • G01R 31/28 - Testing of electronic circuits, e.g. by signal tracer
  • G01R 31/08 - Locating faults in cables, transmission lines, or networks
  • G05B 9/02 - Safety arrangements electric

38.

HIGH-FIDELITY VOLTAGE MEASUREMENT USING A CAPACITANCE-COUPLED VOLTAGE TRANSFORMER

      
Application Number US2018052275
Publication Number 2019/060765
Status In Force
Filing Date 2018-09-21
Publication Date 2019-03-28
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Edmund O., Iii
  • Kasztenny, Bogdan Z.
  • Skendzic, Veselin

Abstract

The present disclosure pertains to systems and methods for detecting traveling waves in electric power delivery systems. In one embodiment, a system comprises a capacitance-coupled voltage transformer (CCVT) in electrical communication with the electric power delivery system, the CCVT comprising a stack of capacitors and an electrical contact to a first ground connection. A current transformer is disposed between the stack of capacitors and the first ground connection. The current transformer provides an electrical signal corresponding to a current associated with the CCVT. An intelligent electronic device (IED) in electrical communication with the first current measurement device generates a voltage signal based on the electrical signal from the current transformer. The IED detects a traveling wave based on the first voltage signal; and analyzes the traveling wave to detect a fault on the electric power delivery system.

IPC Classes  ?

  • G01R 19/00 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof
  • G01R 15/06 - Voltage dividers having reactive components, e.g. capacitive transformer

39.

HIGH-FIDELITY VOLTAGE MEASUREMENT USING RESISTIVE DIVIDER IN A CAPACITANCE-COUPLED VOLTAGE TRANSFORMER

      
Application Number US2018052470
Publication Number 2019/060841
Status In Force
Filing Date 2018-09-24
Publication Date 2019-03-28
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Edmund O., Iii
  • Skendzic, Veselin

Abstract

This disclosure pertains to systems and methods for detecting traveling waves in electric power delivery systems. In one embodiment, a system comprises a capacitance-coupled voltage transformer (CCVT) in an electric power delivery system, the CCVT comprising a first capacitor disposed between an electrical bus and a first electrical node, and a second capacitor electrically disposed between the first electrical node and a ground connection. A resistive divider in electrical communication with a first node may generate a resistive divider electrical signal corresponding to a voltage value. An intelligent electronic device (IED) in electrical communication with the resistive divider monitors a resistive divider voltage signal. The IED detects a traveling wave based on the resistive divider voltage signal and a measurement of a primary current through an electrical bus in electrical communication with the CCVT; and analyzes the traveling wave to detect a fault on the electric power delivery system.

IPC Classes  ?

  • G01R 31/08 - Locating faults in cables, transmission lines, or networks
  • G01R 31/02 - Testing of electric apparatus, lines, or components for short-circuits, discontinuities, leakage, or incorrect line connection
  • H02H 3/16 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to fault current to earth, frame or mass
  • H02H 3/17 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to fault current to earth, frame or mass by means of an auxiliary voltage injected into the installation to be protected

40.

DISTANCE PROTECTION USING TRAVELING WAVES IN AN ELECTRIC POWER DELIVERY SYSTEM

      
Application Number US2018052204
Publication Number 2019/060712
Status In Force
Filing Date 2018-09-21
Publication Date 2019-03-28
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Edmund O., Iii
  • Kasztenny, Bogdan Z.

Abstract

The present disclosure pertains to systems and methods to detect faults in electric power delivery systems. In one embodiment, a data acquisition system may acquire a plurality of electric power delivery system signals from an electric power transmission line. A traveling wave system may detect a traveling wave based on the plurality of electric power delivery system signals received from the data acquisition system. The traveling wave may be analyzed using a first mode to determine a first mode arrival time and using a second mode to determine a second mode arrival time. A time difference between the first mode arrival time and the second mode arrival time may be determined. A fault location system may estimate or confirm a location of the fault based on the time difference. A protection action module may implement a protective action based on the location of the fault.

IPC Classes  ?

  • G01R 31/08 - Locating faults in cables, transmission lines, or networks
  • H02H 7/30 - Staggered disconnection

41.

TRAVELING WAVE IDENTIFICATION USING DISTORTIONS FOR ELECTRIC POWER SYSTEM PROTECTION

      
Application Number US2018052207
Publication Number 2019/060714
Status In Force
Filing Date 2018-09-21
Publication Date 2019-03-28
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Edmund O., Iii
  • Kasztenny, Bogdan, Z.

Abstract

The present disclosure pertains to systems and methods for analyzing traveling waves in an electric power delivery system. In one embodiment, a system may comprise a traveling wave identification subsystem to receive electric power system signals and identify a plurality of incident, reflected, and transmitted traveling waves. A first traveling wave may be selected from the incident and transmitted traveling waves, and a first distortion may be determined. A second traveling wave subsequent to the first traveling wave, may selected from the incident traveling waves and a second distortion may be determined. A traveling wave analysis subsystem may compare the first distortion and the second distortion and determine whether the first distortion is consistent with the second distortion. A protective action subsystem may implement a protective action based on a first determination that the first distortion is consistent with the second distortion.

IPC Classes  ?

  • G01R 31/28 - Testing of electronic circuits, e.g. by signal tracer
  • G01R 31/08 - Locating faults in cables, transmission lines, or networks
  • G05B 9/02 - Safety arrangements electric

42.

IMPROVED ACCURACY OF EVENT LOCATING ON POWERLINES BASED ON FIELD DATA

      
Application Number US2018052480
Publication Number 2019/060848
Status In Force
Filing Date 2018-09-24
Publication Date 2019-03-28
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor Schweitzer, Edmund O., Iii

Abstract

An intelligent electronic device (IED) may detect arrival times and/or other characteristics of traveling waves and/or reflections thereof to determine a distance to a fault location in terms of per-unit length. An IED may convert between line distances, line-of-sight distances, straight-line distances, and/or terrain-based distances. An IED may refine one or more physical line parameters used for traveling wave-based location calculations for iterative improvements in accuracy. For instance, an IED may compare reported distances to fault locations with field -verified, confirmed fault locations to refine physical line parameters used in future location calculations. Similarly, an IED may identify which of a plurality of towers corresponds to a fault location based on a mapping of towers on a per-unit scale. Confirmed fault locations may be used to update or refine the mapping to improve future tower identification relative to per-unit fault location.

IPC Classes  ?

  • G01R 31/08 - Locating faults in cables, transmission lines, or networks
  • G01R 31/11 - Locating faults in cables, transmission lines, or networks using pulse-reflection methods
  • H02H 1/00 - EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS - Details of emergency protective circuit arrangements
  • H02H 3/38 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to phase angle between voltage and current
  • H02J 4/00 - Circuit arrangements for mains or distribution networks not specified as ac or dc

43.

TRANSIENT SIMULATION MODELING FOR DYNAMIC REMEDIAL ACTION SCHEMES USING REAL-TIME PROTECTION SETTING UPDATES

      
Application Number US2018030120
Publication Number 2018/204227
Status In Force
Filing Date 2018-04-30
Publication Date 2018-11-08
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor Gubba Ravikumar, Krishnanjan

Abstract

Protective IEDs in an electrical power system, such as distributed controllers, may periodically or in real-time communicate updated protection settings to a wide-area controller, such as a coordination controller, that defines and/or implements a remedial action scheme to protect the electrical power system. The wide-area controller may utilize real-time protection setting information from a plurality of protective IEDs to perform dynamic transient model simulations based on (1) the current topology of the power system, (2) real-time measurements from the system, and (3) the updated, real time protection settings of various IEDs within the system. The results of the updated transient model simulations may be used to dynamically adjust the remedial actions scheme of the wide-area controller.

IPC Classes  ?

  • G05B 9/02 - Safety arrangements electric
  • G05D 7/06 - Control of flow characterised by the use of electric means
  • G06F 1/28 - Supervision thereof, e.g. detecting power-supply failure by out of limits supervision
  • G06G 7/62 - Analogue computers for specific processes, systems, or devices, e.g. simulators for electric systems or apparatus

44.

TRAVELING WAVE BASED SINGLE END FAULT LOCATION

      
Application Number US2017060800
Publication Number 2018/089598
Status In Force
Filing Date 2017-11-09
Publication Date 2018-05-17
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Edmund O., Iii
  • Guzman-Casillas, Armando
  • Kasztenny, Bogdan Z.
  • Tong, Yajian
  • Mynam, Mangapathirao Venkata

Abstract

Traveling wave information from a single end of an electric power delivery system is used to determine a fault location on a power line of the electric power delivery system. Hypotheses of which of a plurality of received traveling waves represents a first reflection from the fault are evaluated. A determination of an arrival time of the first reflection from the fault is used to calculate a distance from the single end of the power line to the fault location.

IPC Classes  ?

  • G06F 19/00 - Digital computing or data processing equipment or methods, specially adapted for specific applications (specially adapted for specific functions G06F 17/00;data processing systems or methods specially adapted for administrative, commercial, financial, managerial, supervisory or forecasting purposes G06Q;healthcare informatics G16H)
  • G01R 31/02 - Testing of electric apparatus, lines, or components for short-circuits, discontinuities, leakage, or incorrect line connection
  • G01R 13/04 - Arrangements for displaying electric variables or waveforms for producing permanent records
  • G01R 13/06 - Modifications for recording transient disturbances, e.g. by starting or accelerating a recording medium
  • G01R 13/08 - Electromechanical recording system using a mechanical direct-writing method

45.

ELECTRIC POWER SYSTEM MONITORING USING DISTRIBUTED CONDUCTOR-MOUNTED DEVICES

      
Application Number US2017056788
Publication Number 2018/075402
Status In Force
Filing Date 2017-10-16
Publication Date 2018-04-26
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Edmund O., Iii
  • Achanta, Shankar V.
  • Whitehead, David E.

Abstract

Disclosed herein are systems for monitoring and protecting an electric power system using a plurality of conductor-mounted detectors (CMDs). In one embodiment, a plurality of CMDs are coupled to an electrical conductor. Each CMD may harvest power from the electrical conductor and may monitor electrical current in the conductor. When the electrical current in the conductor exceeds a fault current threshold a fault signal may be transmitted. A receiver in communication with each of the plurality of CMDs may receive the fault signal from at least one of the plurality of CMDs. A protective action may be generated and implemented to clear the fault. A portion of the electric power system affected by the fault may be determined based on identification of each of the plurality of CMDs to transmit the fault signal.

IPC Classes  ?

  • G01R 31/08 - Locating faults in cables, transmission lines, or networks

46.

LOW-POWER FIBER OPTIC TRANSCEIVER

      
Application Number US2017048141
Publication Number 2018/039304
Status In Force
Filing Date 2017-08-23
Publication Date 2018-03-01
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Rector, David M.
  • Rice, Raymond W.
  • Watts, Steven
  • Hadley, Vince B.

Abstract

The present disclosure pertains to systems and methods for low-power optical transceivers. In one embodiment, a low-power optical transceiver may include a microcontroller and an optical receiver and an optical transmitter in communication with and controlled by the microcontroller. The optical receiver may include a photodetector configured to receive a first optical representation of a first signal to be received and to generate an electrical representation of the first signal. An amplifier may amplify the electrical representation of the first signal, and an output in electrical communication with the amplifier may generate an electrical output. The optical transmitter may include a laser diode configured to generate a second optical representation of a second signal to be transmitted. The microcontroller may be configured to control an output power of the laser diode.

IPC Classes  ?

  • H04B 10/12 - Transmission through light guides, e.g. optical fibres (H04B 10/22, H04B 10/24, H04B 10/30 take precedence);;
  • H04B 10/11 - Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
  • H04B 10/25 - Arrangements specific to fibre transmission
  • H04B 10/40 - Transceivers
  • H04B 10/43 - Transceivers using a single component as both light source and receiver, e.g. using a photoemitter as a photoreceiver
  • H04B 10/50 - Transmitters
  • H04B 10/60 - Receivers

47.

MICROGRID POWER FLOW MONITORING AND CONTROL

      
Application Number US2017043363
Publication Number 2018/022463
Status In Force
Filing Date 2017-07-21
Publication Date 2018-02-01
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Khatib, Abdel Rahman
  • Cai, Niannian

Abstract

A microgrid power flow monitoring and control system is described herein. The control system may determine active and reactive power sharing shortage on the electric power delivery system. The control system may utilize the control strategies of generation units, such as ISO control, droop control and constant power control to estimate power flow within a microgrid or other isolated system. A control strategy of one or more generators may be modified based on the determined power flow.

IPC Classes  ?

  • G06F 1/30 - Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations
  • H02J 3/00 - Circuit arrangements for ac mains or ac distribution networks
  • H02J 3/46 - Controlling the sharing of output between the generators, converters, or transformers

48.

FAULT DETECTION AND PROTECTION DURING STEADY STATE USING TRAVELING WAVES

      
Application Number US2017043362
Publication Number 2018/022462
Status In Force
Filing Date 2017-07-21
Publication Date 2018-02-01
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Edmund O., Iii
  • Kasztenny, Bogdan Z.
  • Whitehead, David E.

Abstract

An electric power delivery system may be protected upon occurrence of a fault condition by the systems and methods disclosed herein by detecting the fault condition and signaling a protective action before the overcurrent condition reaches the protective equipment. The protective action may be an opening of a circuit breaker or 5 engagement of a fault current limiter. The overcurrent condition may be a non-steady-state condition. The fault may be detected using traveling wave or incremental quantity techniques.

IPC Classes  ?

  • G01R 31/08 - Locating faults in cables, transmission lines, or networks
  • G01R 13/02 - Arrangements for displaying electric variables or waveforms for displaying measured electric variables in digital form
  • G01R 27/16 - Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
  • G01R 31/11 - Locating faults in cables, transmission lines, or networks using pulse-reflection methods

49.

PHASE SELECTION FOR TRAVELING WAVE FAULT DETECTION SYSTEMS

      
Application Number US2017037288
Publication Number 2017/218558
Status In Force
Filing Date 2017-06-13
Publication Date 2017-12-21
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Guzman-Casillas, Armando
  • Kasztenny, Bogdan Z.
  • Mynam, Mangapathirao Venkata

Abstract

Phase selection for traveling wave fault detection systems is disclosed herein. Intelligent electronic devices (IEDs) may be used to monitor and protect electric power delivery systems by detecting and acting upon traveling waves. A phase of the electric power delivery system may be selected based on the relative polarity of the traveling waves detected. The amplitude and/or polarity of the selected phase may be compared with the amplitudes and/or polarities of the other phases to determine a fault condition. For instance, the IED may determine a single-phase-to-ground fault based on the relative polarities and magnitudes of the detected traveling waves, send a protective action to the identified faulted phase, and/or continue to monitor the system for a continuation of the event or identification of a different event, such as a three-phase fault, using incremental quantities.

IPC Classes  ?

  • H02H 7/20 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from norm for electronic equipment
  • G01R 31/08 - Locating faults in cables, transmission lines, or networks
  • G01R 31/40 - Testing power supplies
  • G05B 9/02 - Safety arrangements electric

50.

OVERCURRENT ELEMENT IN TIME DOMAIN

      
Application Number US2017037345
Publication Number 2017/218600
Status In Force
Filing Date 2017-06-13
Publication Date 2017-12-21
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Guzman-Casillas, Armando
  • Kasztenny, Bogdan Z.
  • Mynam, Mangapathirao Venkata
  • Fischer, Normann

Abstract

The present disclosure pertains to systems and methods for supervising protective elements in electric power systems. In one embodiment, a system may be configured to selectively enable a protective action an electric power system. The system may include a data acquisition subsystem receive a plurality of representations of electrical conditions associated with at least a portion of the electric power delivery system. An incremental quantities module may calculate incremental quantities from the plurality of representations. A protective module may be configured to detect an event, to determine an incremental quantities value during the event, and to determine a time-varying threshold. The incremental quantities value during the event may be compared with the time-varying threshold, and a protective action module may be enabled to implement a protective action when the value of the incremental quantities value during the event exceeds the time-varying threshold.

IPC Classes  ?

  • G01R 19/00 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof
  • G01R 21/00 - Arrangements for measuring electric power or power factor
  • G01R 31/02 - Testing of electric apparatus, lines, or components for short-circuits, discontinuities, leakage, or incorrect line connection
  • G01R 31/08 - Locating faults in cables, transmission lines, or networks
  • G01R 31/28 - Testing of electronic circuits, e.g. by signal tracer
  • G05B 9/02 - Safety arrangements electric

51.

SUPERVISION OF INPUT SIGNAL CHANNELS

      
Application Number US2016068787
Publication Number 2017/117167
Status In Force
Filing Date 2016-12-28
Publication Date 2017-07-06
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Edmund O. Iii
  • Skendzic, Veselin
  • Windley, Tracey G.
  • Kasztenny, Bogdan Z.

Abstract

The present disclosure pertains to systems and methods for monitoring a plurality of analog-to-digital converters. In one embodiment, a plurality of input channels may each be in communication with a different phase of a three-phase electric power delivery system. The input channels may be configured to receive analog signals from the different phases. A composite signal subsystem may be configured to generate a composite signal based on the plurality of input channels. An analog-to-digital converter subsystem may be configured to produce a digitized representation of each of the plurality of input channels and a digitized representation of the composite signal. An analog-to-digital converter monitor subsystem may identify an error in the analog-to-digital conversion based on the digitized representation of the composite signal and the digitized representations of the plurality of input channels.

IPC Classes  ?

  • G01R 31/3193 - Tester hardware, i.e. output processing circuits with comparison between actual response and known fault-free response
  • G01R 31/42 - AC power supplies
  • G01R 31/327 - Testing of circuit interrupters, switches or circuit-breakers
  • G01R 31/303 - Contactless testing of integrated circuits

52.

TIME SIGNAL MANIPULATION AND SPOOFING DETECTION BASED ON A LATENCY OF A COMMUNICATION SYSTEM

      
Application Number US2016069374
Publication Number 2017/117482
Status In Force
Filing Date 2016-12-30
Publication Date 2017-07-06
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Edmund O., Iii
  • Tews, Cody W.
  • Whitehead, David E.

Abstract

This disclosure relates to detecting manipulation or spoofing of a time based on a latency of a communication system. In one embodiment, a system includes a time input to receive a time signal. The system includes a first interface to receive a first representation of a first condition at a first location at a first time and a second interface to receive a second representation of a second condition at a second location and at the first time. A latency determination subsystem may determine a latency based on a comparison of the time of arrival of the second measurement and the first time. A threshold subsystem may generate an indication of whether the latency satisfies a threshold. An anomalous condition subsystem may identify an anomalous condition based on the indication, and a remedial action may be implemented based on the anomalous condition.

IPC Classes  ?

  • G01C 21/00 - Navigation; Navigational instruments not provided for in groups
  • G01R 21/00 - Arrangements for measuring electric power or power factor
  • G01R 21/06 - Arrangements for measuring electric power or power factor by measuring current and voltage
  • G01S 1/00 - Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
  • G01S 5/00 - Position-fixing by co-ordinating two or more direction or position-line determinations; Position-fixing by co-ordinating two or more distance determinations
  • G01S 5/14 - Determining absolute distances from a plurality of spaced points of known location

53.

TRAVELING WAVE DIRECTIONAL ELEMENT

      
Application Number US2016056466
Publication Number 2017/066205
Status In Force
Filing Date 2016-10-11
Publication Date 2017-04-20
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Edmund O., Iii
  • Guzman-Casillas, Armando
  • Kasztenny, Bogdan Z.
  • Mynam, Mangapathirao Venkata

Abstract

The present disclosure relates to a fault in an electric power delivery system. In one embodiment, a system may include a data acquisition subsystem configured to receive a plurality of representations of electrical conditions associated with at least a portion of the electric power delivery system. A traveling wave detector may be configured to detect a traveling wave event based on the plurality of representations of electrical conditions. A traveling wave directional subsystem may be configured to calculate an energy value of the traveling wave event during an accumulation period based on the detection of the traveling wave by the traveling wave disturbance detector. A maximum and a minimum energy value may be determined during the accumulation period. A fault direction may be determined based on the maximum energy value and the minimum energy value. A fault detector subsystem configured to declare a fault based on the determined fault direction.

IPC Classes  ?

  • H02J 4/00 - Circuit arrangements for mains or distribution networks not specified as ac or dc

54.

ELECTRIC POWER SYSTEM MONITORING USING HIGH-FREQUENCY SIGNALS

      
Application Number US2016056892
Publication Number 2017/066476
Status In Force
Filing Date 2016-10-13
Publication Date 2017-04-20
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Edmund O., Iii
  • Skendzic, Veselin
  • Tews, Cody W.
  • Whitehead, David E.

Abstract

A system for monitoring an electric power delivery system by obtaining high-frequency electric power system measurements and displaying event information is disclosed herein. The system may use the high-frequency electric power system information to detect traveling waves. The system may generate a display showing fault location on the electric power system, and timing of traveling waves received at locations on the electric power system. The display may include time on one axis and location on another axis. The display may include a waterfall display.

IPC Classes  ?

  • G01R 31/02 - Testing of electric apparatus, lines, or components for short-circuits, discontinuities, leakage, or incorrect line connection
  • G01R 31/08 - Locating faults in cables, transmission lines, or networks
  • G01R 31/11 - Locating faults in cables, transmission lines, or networks using pulse-reflection methods

55.

TESTING SYSTEM FOR TRAVELING WAVE FAULT DETECTORS

      
Application Number US2016056911
Publication Number 2017/066489
Status In Force
Filing Date 2016-10-13
Publication Date 2017-04-20
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Whitehead, David E.
  • Lee, Tony J.
  • Sheffield, Zachary King
  • Windley, Tracey G

Abstract

A testing apparatus for imposing a traveling wave signal on an electric system signal for testing a fault detector is disclosed herein. The fault detector may be configured to simulate a fault at a particular location by controlling the timing of the traveling wave signal. The testing apparatus may be configured to impose multiple traveling wave signals to test the accuracy of the fault location determined by the fault detector. The testing apparatus may be configured to determine the calculation accuracy of the fault detector. The testing apparatus may impose a traveling wave signal on a signal simulating an electrical signal on an electric power delivery system. The testing apparatus may be used to test capabilities of a fault detector of detecting a fault using traveling waves or incremental quantities.

IPC Classes  ?

  • H02H 7/26 - Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occurred
  • G06F 11/273 - Tester hardware, i.e. output processing circuits
  • G06F 11/277 - Tester hardware, i.e. output processing circuits with comparison between actual response and known fault-free response
  • H02H 3/26 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to phase angle between voltages or between currents
  • H02H 3/28 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus

56.

HIGH-FREQUENCY ELECTRIC POWER SYSTEM SIGNAL PROCESSING SYSTEM

      
Application Number US2016057218
Publication Number 2017/066704
Status In Force
Filing Date 2016-10-14
Publication Date 2017-04-20
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Edmund, O., Iii
  • Whitehead, David, E.
  • Mynam, Mangapathirao, Venkata

Abstract

The present disclosure pertains to systems and methods for obtaining and processing high-frequency electric power system measurements for control and monitoring of an electric power system. High-frequency measurements may be used to detect traveling waves and/or to detect faults in the electric power system. In various embodiments, a processing device may receive high-frequency electric power system measurements from each of a local location and a remote location and may process the high-frequency electric power system measurements to identify and locate a fault. The occurrence of and location of a fault and may be used to implement protective actions to remediate identified faults.

IPC Classes  ?

  • G01R 31/08 - Locating faults in cables, transmission lines, or networks
  • G01R 31/02 - Testing of electric apparatus, lines, or components for short-circuits, discontinuities, leakage, or incorrect line connection
  • G01R 27/16 - Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
  • G01R 13/02 - Arrangements for displaying electric variables or waveforms for displaying measured electric variables in digital form

57.

TIME-DOMAIN LINE PROTECTION OF ELECTRIC POWER DELIVERY SYSTEMS

      
Application Number US2016052329
Publication Number 2017/049224
Status In Force
Filing Date 2016-09-16
Publication Date 2017-03-23
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Edmund, O., Iii
  • Mynam, Mangapathirao, Venkata
  • Whitehead, David, E.
  • Kasztenny, Bogdan, Z.
  • Guzman-Casillas, Armando
  • Skendzic, Veselin

Abstract

The present disclosure relates to detection of faults in an electric power system. A time-domain traveling wave differential subsystem is configured to determine at a first terminal a first index between an arrival maximum of a traveling wave generated by a fault at the first terminal and an exit maximum of the traveling wave. An incremental quantities subsystem may be configured to calculate a plurality of values of an operating quantity based on the plurality of time-domain representations of electrical conditions. An incremental quantities subsystem is configured to determine a forward torque, an operating torque, and a reverse torque based on the plurality of time-domain representations of electrical conditions. A time-domain traveling wave directional subsystem is configured to receive a plurality of current traveling wave and a plurality of voltage traveling wave time-domain representations based on electrical conditions in the electric power delivery system.

IPC Classes  ?

  • H02H 7/26 - Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occurred
  • G06F 11/273 - Tester hardware, i.e. output processing circuits
  • G06F 11/277 - Tester hardware, i.e. output processing circuits with comparison between actual response and known fault-free response
  • H02H 3/26 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to phase angle between voltages or between currents
  • H02H 3/28 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
  • H02H 3/33 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers

58.

COMMUNICATION DEVICE FOR IMPLEMENTING SELECTIVE ENCRYPTION IN A SOFTWARE DEFINED NETWORK

      
Application Number US2016039582
Publication Number 2017/039796
Status In Force
Filing Date 2016-06-27
Publication Date 2017-03-09
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Smith, Rhett
  • Grussling, Barry Jakob

Abstract

The present disclosure pertains to systems and methods for selectively encrypting data flows within a software defined network (SDN). In one embodiment, a communication device may be configured to receive a plurality of unencrypted data packets. The communication device may receive from an SDN controller a criterion used to identify at least one of the unencrypted data flows to be encrypted. Based on the criterion, an encryption subsystem may generate an encrypted data flow the unencrypted data packets based on an encryption key. In some embodiments, the encryption system may parse the packets and encrypt the data payloads without encrypting the routing information associated with the packet. In other embodiments, the encryption subsystem may be configured to encapsulate and encrypt the entire unencrypted data packet. In some embodiments, the encryption subsystem may further be configured to authenticate a sending device and/or to verify the integrity of a message.

IPC Classes  ?

  • H04L 29/06 - Communication control; Communication processing characterised by a protocol

59.

SIMULATING, VISUALIZING, AND SEARCHING TRAFFIC IN A SOFTWARE DEFINED NETWORK

      
Application Number US2016038419
Publication Number 2017/014891
Status In Force
Filing Date 2016-06-20
Publication Date 2017-01-26
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Dearien, Jason A.
  • Berner, Marc Ryan
  • Powers, Josh

Abstract

The present disclosure pertains to systems and methods for simulating data packet routing within a software defined network ("SDN"), visualizing the results of the simulation, and permitting a user to search the resulting simulation. In one specified embodiment, a system may receive from a user a simulation parameter associated with a packet to be simulated in the SDN. A packet based on the at least one simulation parameter may be generated. A response of the SDN to the packet may be simulated by identifying applicable traffic routing rules and identifying a subsequent destination based on the applicable traffic routing rules. A record of the subsequent destination may be added to the simulation result, and the process may continue until a terminating condition is satisfied.

IPC Classes  ?

  • H04L 12/26 - Monitoring arrangements; Testing arrangements
  • H04L 12/28 - Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
  • H04L 12/725 - Selecting a path with suitable quality of service [QoS]

60.

CONFIGURATION OF A SOFTWARE DEFINED NETWORK

      
Application Number US2016039079
Publication Number 2017/014904
Status In Force
Filing Date 2016-06-23
Publication Date 2017-01-26
Owner SCHWEITZER ENGINEERING LABORATORIES, INC . (USA)
Inventor
  • Berner, Marc Ryan
  • Smith, Rhett
  • Dearien, Jason A.
  • Powers, Josh
  • Boomer, Grant O.

Abstract

The present disclosure pertains to systems and method for configuration of communication flows in a software defined network ("SDN"). In one embodiment, a system is operable to configure a communication flow between a first host and a second host. A mode selection subsystem is configured to cause a plurality of network devices in a network connecting the first communication host and the second communication host to transition between an open mode and an SDN operating mode. In the open mode, the network devices may discover a communication path between the first host and the second host. An analysis subsystem may receive information from the plurality of network devices information about the discovered path, and a topology discovery subsystem may be configured to create a communication flow corresponding to the discovered path. The communication flow may allow communication between the first host and the second host in the SDN operating mode.

IPC Classes  ?

  • G06F 17/30 - Information retrieval; Database structures therefor
  • H04L 12/24 - Arrangements for maintenance or administration
  • H04L 12/70 - Packet switching systems
  • H04L 29/06 - Communication control; Communication processing characterised by a protocol
  • H04L 29/08 - Transmission control procedure, e.g. data link level control procedure

61.

COMMUNICATION LINK FAILURE DETECTION IN A SOFTWARE DEFINED NETWORK

      
Application Number US2016039081
Publication Number 2017/014905
Status In Force
Filing Date 2016-06-23
Publication Date 2017-01-26
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Smith, Rhett
  • Berner, Marc Ryan

Abstract

The present disclosure pertains to systems and methods of monitoring communication devices and communication links in a software defined network (SDN). In one embodiment a system may include a data bus and a communication interface in communication with the data bus. The system may further include a communication link monitoring subsystem configured to receive an indication of a status of the communication devices and the communication links over time. The system may associate the status of the communication devices and the communication links over time. The system may determine a deviation from normal parameters based on a current status, and may assess a likelihood of a change in the status based on the deviation from normal parameters. If necessary, a traffic rerouting subsystem configured to reroute data traffic to a failover path based on the likelihood of a change in the status.

IPC Classes  ?

  • G06F 17/30 - Information retrieval; Database structures therefor
  • H04L 12/24 - Arrangements for maintenance or administration
  • H04L 12/70 - Packet switching systems
  • H04L 29/06 - Communication control; Communication processing characterised by a protocol
  • H04L 29/08 - Transmission control procedure, e.g. data link level control procedure

62.

ROUTING OF TRAFFIC IN NETWORK THROUGH AUTOMATICALLY GENERATED AND PHYSICALLY DISTINCT COMMUNICATION PATHS

      
Application Number US2016038139
Publication Number 2017/014878
Status In Force
Filing Date 2016-06-17
Publication Date 2017-01-26
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Smith, Rhett
  • Berner, Marc Ryan
  • Powers, Josh
  • Buehler, David M.
  • Dearien, Jason A.

Abstract

The present disclosure pertains to systems and methods to identify high-priority traffic within a software defined network ("SDN") and to route such traffic through physically distinct communication paths. Such routing may help to reduce network congestion faced by high-priority traffic and increase the reliability of transmission of such data. Certain embodiments may further be configured to generate a failover communication path that is physically distinct from a primary communication path. Still further, certain embodiments may be configured to suggest enhancements to a network that may improve a reliability criterion.

IPC Classes  ?

  • H04L 12/26 - Monitoring arrangements; Testing arrangements
  • H04L 12/28 - Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
  • H04L 12/725 - Selecting a path with suitable quality of service [QoS]

63.

TRANSMISSION LINE PROTECTION USING TRAVELING WAVES IN OPTICAL GROUND WIRE FIBER

      
Application Number US2016017802
Publication Number 2016/130949
Status In Force
Filing Date 2016-02-12
Publication Date 2016-08-18
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Kasztenny, Bogdan Z.
  • Taylor, Douglas I.

Abstract

Disclosed herein are systems for detecting a location of a fault on an electric power transmission line using a state-of-polarization traveling wave in an optical ground wire. Various embodiments may also detect a traveling wave on a conductor of the transmission system. The arrival times of the state-of-polarization traveling wave and the electrical traveling wave may be compared. Using the difference in times and the known propagation velocities of the traveling waves, a distance to the fault may be calculated. Arrival time of the state-of-polarization traveling wave may be calculated using electrical signals from photodetectors in an optical channel with polarizing filters at different orientations or reference frames.

IPC Classes  ?

  • G01K 11/32 - Measuring temperature based on physical or chemical changes not covered by group , , , or using changes in transmittance, scattering or luminescence in optical fibres
  • G01B 11/16 - Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
  • G01R 31/08 - Locating faults in cables, transmission lines, or networks

64.

FAULT LOCATION USING TRAVELING WAVES

      
Application Number US2016014061
Publication Number 2016/118584
Status In Force
Filing Date 2016-01-20
Publication Date 2016-07-28
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Edmund O., Iii
  • Mynam, Mangapathirao Venkata
  • Guzman-Casillas, Armando

Abstract

The present disclosure relates to calculating a fault location in an electric power transmission system based on traveling waves. In one embodiment, a system consistent with the present disclosure may be configured to detect a fault in an electric power transmission system. The system may include a traveling wave detection subsystem configured to detect and measure traveling waves on a transmission line and a fault location estimation subsystem. The fault location estimation subsystem may receive from the traveling wave detection subsystem a first plurality of traveling waves on the transmission line generated during a reference event. The fault location estimation subsystem may receive from the traveling wave detection subsystem a second plurality of traveling waves generated during an unplanned event. An unmatched traveling wave in the second plurality of waves may be detected and a location of the unplanned event based on the unmatched traveling wave.

IPC Classes  ?

  • G01R 31/11 - Locating faults in cables, transmission lines, or networks using pulse-reflection methods
  • G01R 13/02 - Arrangements for displaying electric variables or waveforms for displaying measured electric variables in digital form
  • H02H 7/26 - Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occurred

65.

MULTILINGUAL POWER SYSTEM PROTECTION DEVICE

      
Application Number US2016014059
Publication Number 2016/118582
Status In Force
Filing Date 2016-01-20
Publication Date 2016-07-28
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • D'Aversa, Angelo
  • Lee, Man Lung
  • Howell, Matthew J.
  • Stanley, Thomas Allen

Abstract

A multilingual power system protection device to facilitate communications in different human languages over different communication ports is described herein. In one embodiment, an electric power system device may include communication ports configured to receive inputs in different human languages and a monitored equipment interface in communication with a component of an electric power system. The electric power system device may receive an input on one of the communication ports and may associate the input with a function implemented by the component of the electric power system. The electric power system device may further generate a response in a pre-selected human language, and may transmit the response using the communication ports.

IPC Classes  ?

  • G06F 3/00 - Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements

66.

GENERATOR PROTECTION ELEMENT

      
Application Number US2015056870
Publication Number 2016/105655
Status In Force
Filing Date 2015-10-22
Publication Date 2016-06-30
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Thompson, Michael J.
  • Finney, Dale S.

Abstract

The present disclosure is applicable to generators with low motoring power. In one embodiment, a generator protection element may include a generator monitoring subsystem configured to measure a real power output and an imaginary power output of a generator. The system may also include an electrical parameter threshold subsystem configured to determine whether the measured real power output and the measured imaginary power output satisfy a tripping characteristic. The tripping characteristic may be defined by a function having a slope with respect to a real power axis and an imaginary power axis. In some embodiments, the function may be a piecewise function that defines a first linear segment having a first slope and a second linear segment having a second slope. The first slope and the second slope may be equal and opposite. A tripping subsystem may issue a trip command based upon satisfaction of the tripping characteristic.

IPC Classes  ?

  • F01K 3/00 - Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
  • H02K 7/18 - Structural association of electric generators with mechanical driving motors, e.g.with turbines
  • H02K 7/00 - Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines

67.

TIME SIGNAL VERIFICATION AND DISTRIBUTION

      
Application Number US2015054144
Publication Number 2016/057458
Status In Force
Filing Date 2015-10-06
Publication Date 2016-04-14
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Achanta, Shankar V.
  • Achanta, Srinivas
  • Whitehead, David E.

Abstract

The time signal verification and distribution device disclosed herein verifies and distributes a time signal to consuming devices. The device determines a time quality status of a first and second time signal, calculates a difference between a first and a second time signal, and compares the difference to a predetermined threshold. Based on the time quality status and the comparison, the time signal verification and distribution device distributes a time signal to a plurality of time signal consuming devices. Exceeding the predetermined threshold may indicate a spoofing attack or other problem with the time signals.

IPC Classes  ?

  • G01S 19/10 - Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing dedicated supplementary positioning signals
  • G01S 19/13 - Receivers
  • H04L 12/413 - Bus networks with decentralised control with random access, e.g. carrier-sense multiple-access with collision detection (CSMA-CD)

68.

DETERMINING STATUS OF ELECTRIC POWER TRANSMISSION LINES IN AN ELECTRIC POWER TRANSMISSION SYSTEM

      
Application Number US2015050977
Publication Number 2016/048832
Status In Force
Filing Date 2015-09-18
Publication Date 2016-03-31
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Gubba Ravikumar, Krishnanjan
  • Upreti, Ashish
  • Nayak, Bharath
  • Korkmaz, Yusuf Zafer

Abstract

The present application discloses systems and methods to determine loss of at least one electric power transmission line in an electric power transmission system. In various embodiments, a system consistent with the present disclosure may include an electrical parameter monitoring subsystem configured to receive electrical parameter measurements and to determine a change of the electrical measurements. An analysis subsystem may determine whether a change in the electrical measurements is indicative of loss of at least one transmission line and may calculate a number of transmission lines lost based on the change. In some embodiments, a remedial action subsystem may be configured to implement a remedial action in response to loss of at least one transmission line. The number of transmission lines lost may be determined based on an angle difference ratio and a power ratio between two buses in electrical transmission system.

IPC Classes  ?

  • G01R 31/08 - Locating faults in cables, transmission lines, or networks
  • G01R 31/11 - Locating faults in cables, transmission lines, or networks using pulse-reflection methods

69.

FAULT DETECTION IN ELECTRIC POWER DELIVERY SYSTEMS USING UNDERREACH, DIRECTIONAL, AND TRAVELING WAVE ELEMENTS

      
Application Number US2015050504
Publication Number 2016/044469
Status In Force
Filing Date 2015-09-16
Publication Date 2016-03-24
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Edmund, O., Iii
  • Mynam, Mangapathirao, Venkata
  • Guzman-Casillas, Armando
  • Skendzic, Veselin
  • Kasztenny, Bogdan Z.
  • Lee, Tony J.
  • Whitehead, David E.

Abstract

The present disclosure pertains to systems and methods for detecting faults in an electric power delivery system. In one embodiment, a system may include a data acquisition subsystem configured to receive a plurality of representations of electrical conditions. A traveling wave differential subsystem may be configured to determine operating quantities and restraint quantities from the plurality of representations of electrical conditions. An incremental quantities subsystem configured to calculate an incremental current quantity and an incremental voltage quantity. A fault detector subsystem may be configured to declare a fault based on a comparison of the operating quantity and the restraint quantity. The fault detection subsystem may be configured to determine a fault type based on the incremental current quantity and the incremental voltage quantity, to select an applicable loop quantity, and to declare a fault. A protective action subsystem may implement a protective action based on the declaration of the fault.

IPC Classes  ?

  • G01R 19/25 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
  • G06F 19/24 - for machine learning, data mining or biostatistics, e.g. pattern finding, knowledge discovery, rule extraction, correlation, clustering or classification
  • G01R 31/08 - Locating faults in cables, transmission lines, or networks
  • H02H 3/42 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to product of voltage and current
  • H02H 3/50 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to the appearance of abnormal wave forms, e.g. ac in dc installations

70.

RELAY CONFIGURATION SYSTEMS AND METHODS

      
Application Number US2015042610
Publication Number 2016/022349
Status In Force
Filing Date 2015-07-29
Publication Date 2016-02-11
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Lee, Tony, J.
  • Dodgen, Stephen, L.
  • Patrick, Michael, H.
  • Underwood, Lee, S.

Abstract

Disclosed herein are a variety of systems and methods that may be utilized to facilitate the configuration of intelligent electronic devices (IED) and other devices. In one embodiment, a configurable IED may be able to perform a plurality of features. The plurality of features may be enabled by a plurality of functional modules configured to implement the plurality of features. A feature-selecting subsystem configured to receive a first feature-selecting filter and to apply the first feature-selecting filter to selectively enable a subset of a plurality of features based on the feature-selecting filter. The subset of the plurality of features may be associated with a plurality of feature configuration settings. A feature configuration subsystem configured to receive at least one configuration filter and to set at least a subset of the plurality of feature configuration settings.

IPC Classes  ?

  • G06F 9/00 - Arrangements for program control, e.g. control units
  • G06F 15/177 - Initialisation or configuration control
  • G06F 17/00 - Digital computing or data processing equipment or methods, specially adapted for specific functions

71.

SYSTEMS AND METHODS FOR MONITORING AND PROTECTING AN ELECTRIC POWER GENERATOR

      
Application Number US2015041950
Publication Number 2016/014924
Status In Force
Filing Date 2015-07-24
Publication Date 2016-01-28
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Kasztenny, Bogdan Z.
  • Fischer, Normann
  • Finney, Dale S.
  • Taylor, Douglas I.

Abstract

Protection of an electrical generator includes determining a rotor and stator components using rotor and stator electrical signals, calculating a unbalance and/or differential component using the stator and rotor components, and determining a stator or rotor fault based on the unbalance and/or differential component. Further, the faulted phase and/or zone of a stator fault may be determined using the stator positive sequence voltage and negative sequence current.

IPC Classes  ?

  • H02H 7/06 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from norm for synchronous capacitors

72.

PHYSICAL ACCESS CONTROL AUTHENTICATION

      
Application Number US2015038622
Publication Number 2016/007332
Status In Force
Filing Date 2015-06-30
Publication Date 2016-01-14
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Masters, George W.
  • Smith, Rhett

Abstract

Disclosed herein are a variety of systems and methods for authentication physical access to a distributed site of an electric power generation and delivery system. According to various embodiments, a mobile device may be utilized as an input device for a physical access control system associated with a distributed site. Authentication credentials entered by a user using the mobile device may be communicated to the physical access control system for use in connection with authentication and/or access control decisions. Using the mobile device may, among other things, allow for users to provide certain authentication credentials to the physical access control system without the need to utilize certain input devices that may be prone to damage and/or failure due to exposure to environmental conditions.

IPC Classes  ?

  • E05B 49/00 - Electric permutation locks; Circuits therefor
  • G07C 9/00 - Individual registration on entry or exit
  • H02B 7/06 - Distribution substations, e.g. for urban network

73.

ADAPTIVE HOLDOVER TIMING ERROR ESTIMATION AND CORRECTION

      
Application Number US2015029939
Publication Number 2015/195221
Status In Force
Filing Date 2015-05-08
Publication Date 2015-12-23
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Rippon, Daniel B.
  • Achanta, Shankar V.

Abstract

Disclosed herein are a variety of various systems and method for adaptive holdover time error estimation. In one embodiment a system may include a local time source configured to generate a local time signal and an external time source interface configured to receive an external time signal. A time source subsystem may be configured to compare the local time signal and the external time signal and to determine a temperature-dependent signal drift rate of the local time signal relative to the external time signal. The time source subsystem may be a time-dependent signal drift rate of the local time signal relative to the external time signal. A holdover subsystem may detect a loss of reception of the external time signal during a holdover period and may estimate a total maximum error based on an estimated maximum time-dependent error and an estimated maximum temperature-dependent error.

IPC Classes  ?

  • G06F 1/12 - Synchronisation of different clock signals
  • H04W 56/00 - Synchronisation arrangements
  • G01S 19/03 - Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers

74.

SYNCHRONOUS MACHINE MONITORING USING TIME STAMPED ELECTRICAL AND MECHANICAL DATA

      
Application Number US2015030481
Publication Number 2015/179179
Status In Force
Filing Date 2015-05-13
Publication Date 2015-11-26
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Seeley, Nicholas C.
  • Casebolt, David J.
  • Zweigle, Gregary C.

Abstract

Electrical power machines are monitored according to the disclosure herein using time stamped mechanical conditions and electrical conditions. The mechanical conditions may include rotational position, calculated and time stamped rotational frequency, valve position, temperature, or vibration. The time stamped electrical conditions may include electrical power system frequency, electrical power machine field data, electrical power machine terminal information such as voltage and current, and the like. Electrical and mechanical time-stamped electrical power machine data from different machines that may be local or remote from each other may be compared for monitoring the machines.

IPC Classes  ?

  • H02H 7/08 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from norm for dynamo-electric motors

75.

RESILIENT COMMUNICATION FOR AN ELECTRIC POWER DELIVERY SYSTEM

      
Application Number US2015022795
Publication Number 2015/167712
Status In Force
Filing Date 2015-03-26
Publication Date 2015-11-05
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Dolezilek, David J.
  • Kalra, Amandeep Singh

Abstract

A system for resiliently monitoring an electric power delivery system may include a plurality of server intelligent electronic devices (IEDs) configured to monitor and/or control the electric power delivery system. Each server IED may be communicatively coupled to a client control system by a plurality of communication paths. If a communication path fails, communication may continue along another path. In an embodiment, the client control system may include dual primary client controllers that continually request information from the server IEDs using multiple of the communication paths. The client controllers may request information from each other if the information is not received from the server IEDs, for example, due to a communication failure. In an embodiment, the client control system and server IEDs may be communicatively coupled in a loop topology, and each direction around the loop may be a distinct communication path.

IPC Classes  ?

  • G06F 1/30 - Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations

76.

TIME SIGNAL PROPAGATION DELAY CORRECTION

      
Application Number US2015024000
Publication Number 2015/167745
Status In Force
Filing Date 2015-04-02
Publication Date 2015-11-05
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Rice, Raymond W.
  • Achanta, Srinivas

Abstract

Disclosed herein are a variety of systems and methods for correcting for propagation delay in time signals used in connection with an electric power generation and delivery system. According to various embodiments, a device consistent with the present disclosure may determine an estimated propagation delay between an accurate time source and a receiving device. The propagation delay may be determined based on a variety of transmission parameters including, for example, communication channel type and/or length. A corrected time signal may be generated by advancing a reference incitation such as an "on-time" reference and/or "start-of-second" reference included in the time signal by an amount associated with the propagation delay. The corrected time signal may then be transmitted to the receiving device.

IPC Classes  ?

77.

CONTINGENCY-BASED LOAD SHEDDING

      
Application Number US2015014487
Publication Number 2015/130439
Status In Force
Filing Date 2015-02-04
Publication Date 2015-09-03
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Bartlett, Jedidiah W.
  • Allen, William F.

Abstract

Disclosed herein are a variety of systems and methods for management of an electric power generation and distribution system. According to various embodiments, a system consistent with the present disclosure may be configured to analyze a data set comprising a plurality of generator performance characteristics of a generator at a plurality of operating conditions. The performance characteristics may be used to produce a generator capability model. The generator capability model may comprise a mathematical representation approximating the generator performance characteristics at the plurality of operating conditions. The system may further produce an estimated generator capacity at a modeled condition that is distinct from the generator performance characteristics of the data set and is based upon the generator capability model and may implement a control action based on the estimated generator capacity at the modeled condition.

IPC Classes  ?

  • G05D 3/12 - Control of position or direction using feedback

78.

POWER SYSTEM MANAGEMENT

      
Application Number US2015014486
Publication Number 2015/130438
Status In Force
Filing Date 2015-02-04
Publication Date 2015-09-03
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Bartlett, Jedidiah W.
  • Burns, Joshua

Abstract

Disclosed herein are a variety of systems and methods for management of an electric power generation and distribution system. According to various embodiments, a system consistent with the present disclosure may be configured to analyze a data set comprising a plurality of generator performance characteristics of a generator at a plurality of operating conditions. The performance characteristics may be used to produce a generator capability model. The generator capability model may comprise a mathematical representation approximating the generator performance characteristics at the plurality of operating conditions. The system may further produce an estimated generator capacity at a modeled condition that is distinct from the generator performance characteristics of the data set and is based upon the generator capability model and may implement a control action based on the estimated generator capacity at the modeled condition.

IPC Classes  ?

  • G05D 3/12 - Control of position or direction using feedback
  • G05D 5/00 - Control of dimensions of material

79.

TOPOLOGY DETERMINATION USING GRAPH THEORY

      
Application Number US2015014488
Publication Number 2015/130440
Status In Force
Filing Date 2015-02-04
Publication Date 2015-09-03
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Bartlett, Jedidiah W.
  • Streets, Jeromy

Abstract

Disclosed herein are a variety of systems and methods for management of an electric power generation and distribution system. According to various embodiments, a system consistent with the present disclosure may be configured to analyze a data set comprising a plurality of generator performance characteristics of a generator at a plurality of operating conditions. The performance characteristics may be used to produce a generator capability model. The generator capability model may comprise a mathematical representation approximating the generator performance characteristics at the plurality of operating conditions. The system may further produce an estimated generator capacity at a modeled condition that is distinct from the generator performance characteristics of the data set and is based upon the generator capability model and may implement a control action based on the estimated generator capacity at the modeled condition.

IPC Classes  ?

  • G06F 15/173 - Interprocessor communication using an interconnection network, e.g. matrix, shuffle, pyramid, star or snowflake

80.

MONITORING SYNCHRONIZATION OF A MOTOR USING STATOR CURRENT MEASUREMENTS

      
Application Number US2014051848
Publication Number 2015/041789
Status In Force
Filing Date 2014-08-20
Publication Date 2015-03-26
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor Donolo, Marcos A.

Abstract

Monitoring synchronization of an electric motor using current signals from power supplied to the motor is disclosed herein. The current signals may be used to calculate representative current values which may be used to calculate a rotational frequency of the rotor of the motor. The rotational frequency may be used to determine synchronization, such as slip. Monitoring may be during startup of a synchronous motor in induction mode. Upon reaching a predetermined synchronization threshold, the motor may be configured from induction mode to synchronous mode.

IPC Classes  ?

  • H02H 7/08 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from norm for dynamo-electric motors

81.

SELECTION AND DISPLAY OF POLLED AND STREAMED ELECTRIC POWER SYSTEM MEASUREMENTS

      
Application Number US2014057023
Publication Number 2015/042591
Status In Force
Filing Date 2014-09-23
Publication Date 2015-03-26
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Zweigle, Gregary C.
  • Hewitt, Eric J.
  • Blood, Ellery A.
  • Gotshall, Stanley P.
  • Huddleston, Riley Grant
  • Morrison, William D.
  • Bestebreur, Jared Kyle

Abstract

Combining and analyzing streamed and polled electric power delivery system information is disclosed herein. A system therefore includes a plurality of IEDs in communication with the electric power distribution system and configured to provide streaming and/or polled data via a communications network. An analysis engine in communication with the communications network receives selected streaming information and requested polled information, analyzes such streamed and polled information, and provides a display of such streaming and polled information to a user.

IPC Classes  ?

  • G06F 15/16 - Combinations of two or more digital computers each having at least an arithmetic unit, a program unit and a register, e.g. for a simultaneous processing of several programs
  • G06F 15/173 - Interprocessor communication using an interconnection network, e.g. matrix, shuffle, pyramid, star or snowflake
  • G06F 17/30 - Information retrieval; Database structures therefor

82.

DETECTION OF FAULTS IN POWER DISTRIBUTION SYSTEM

      
Application Number US2014054233
Publication Number 2015/038424
Status In Force
Filing Date 2014-09-05
Publication Date 2015-03-19
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Fischer, Normann
  • Kalra, Amandeep Singh

Abstract

Detection of a fault in an ungrounded electric power distribution system that includes a plurality of feeders and buses is disclosed herein. Embodiments consistent with the present disclosure may monitor an electrical parameter associated with each of a plurality of feeders and buses in the ungrounded electric power distribution system. An incremental change in the monitored electrical parameters may be determined using the monitored electrical parameter. Further, the incremental change may be associated with a first sub-set of the plurality of feeders. Torque values for the feeders may be calculated using a reference quantity from the bus first exhibiting an incremental change above a threshold. A feeder having the largest incremental change in the first sub-set of the plurality of feeders may be identified. A fault may be identified based on the torque and the incremental change.

IPC Classes  ?

  • H02H 3/26 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to phase angle between voltages or between currents
  • G01R 11/25 - Arrangements for indicating or signalling faults
  • G01R 31/08 - Locating faults in cables, transmission lines, or networks

83.

FAULT LOCATION CALCULATING TRAVELING WAVE ARRIVAL TIME

      
Application Number US2014055894
Publication Number 2015/039113
Status In Force
Filing Date 2014-09-16
Publication Date 2015-03-19
Owner SCHWEITZER ENGINEERING LABORATORIES, INC (USA)
Inventor
  • Schweitzer, Edmund O., Iii
  • Mynam, Mangapathirao Venkata
  • Guzman-Casillas, Armando
  • Lee, Tony J.
  • Skendzic, Veselin
  • Kasztenny, Bogdan Z.
  • Whitehead, David E.

Abstract

A location of a fault in an electric power delivery system may be detected using traveling waves instigated by the fault. The time of arrival of the traveling wave may be calculated using the peak of the traveling wave. To determine the time of arrival of the peak of the traveling wave, estimates may be made of the time of arrival, and a parabola may be fit to filtered measurements before and after the estimated peak. The maximum of the parabola may be the time of arrival of the traveling wave. Dispersion of the traveling wave may also be corrected using an initial location of the fault and a known rate of dispersion of the electric power delivery system. Time stamps may be corrected using the calculated dispersion of the traveling wave.

IPC Classes  ?

  • G01R 31/08 - Locating faults in cables, transmission lines, or networks
  • G01R 31/11 - Locating faults in cables, transmission lines, or networks using pulse-reflection methods
  • G01R 31/315 - Contactless testing by inductive methods

84.

TRAVELING WAVE VALIDATION USING ESTIMATED FAULT LOCATION

      
Application Number US2014055896
Publication Number 2015/039114
Status In Force
Filing Date 2014-09-16
Publication Date 2015-03-19
Owner SCHWEITZER ENGINEERING LABORATORIES, INC (USA)
Inventor
  • Schweitzer, Edmund O., Iii
  • Mynam, Mangapathirao Venkata
  • Guzman-Casillas, Armando
  • Skendzic, Veselin
  • Kasztenny, Bogdan Z.
  • Whitehead, David E.

Abstract

Electric power delivery system fault location systems and methods as disclosed herein include validation of the received traveling wave fault measurements. Validation may include estimating a location of the fault using an impedance-based fault location calculation. Time windows of expected arrival times of traveling waves based on the estimated fault location and known parameters of the line may then be established. Arrival times of traveling waves may then be compared against the time windows. If the traveling waves arrive within a time window, then the traveling waves may be used to calculate the location of the fault.

IPC Classes  ?

  • G01R 31/08 - Locating faults in cables, transmission lines, or networks
  • G01R 31/11 - Locating faults in cables, transmission lines, or networks using pulse-reflection methods
  • G01R 31/315 - Contactless testing by inductive methods

85.

POWER LINE PARAMETER ADJUSTMENT AND FAULT LOCATION USING TRAVELING WAVES

      
Application Number US2014055919
Publication Number 2015/039124
Status In Force
Filing Date 2014-09-16
Publication Date 2015-03-19
Owner SCHWEITZER ENGINEERING LABORATORIES, INC (USA)
Inventor
  • Schweitzer, Edmund O., Iii
  • Mynam, Mangapathirao Venkata
  • Guzman-Casillas, Armando
  • Skendzic, Veselin
  • Kasztenny, Bogdan Z.
  • Whitehead, David E.

Abstract

Fault location using traveling waves in an electric power delivery system according to the embodiments herein uses line parameters that are adjusted using traveling wave reflections from known discontinuities in the electric power delivery system. The arrival times of a traveling wave and a reflection of the traveling wave from a known discontinuity may be used to adjust parameters of the electric power delivery system such as, for example, line length. The adjusted parameter can then be used to more accurately calculate the location of the fault using the traveling waves.

IPC Classes  ?

  • G06F 19/00 - Digital computing or data processing equipment or methods, specially adapted for specific applications (specially adapted for specific functions G06F 17/00;data processing systems or methods specially adapted for administrative, commercial, financial, managerial, supervisory or forecasting purposes G06Q;healthcare informatics G16H)

86.

DELAY COMPENSATION FOR VARIABLE CABLE LENGTH

      
Application Number US2014049813
Publication Number 2015/023478
Status In Force
Filing Date 2014-08-05
Publication Date 2015-02-19
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Achanta, Srinivas
  • Ahsan, Hidayatullah

Abstract

The present application discloses a time distribution device capable of providing a synchronized time signal to a plurality of end devices connected to the time distribution device with cables of various lengths. The time distribution device may receive a time signal, generate a time reference based on the received time signal, compensate the time reference for hardware delay, and overcompensate the time reference for a delay caused by a maximum cable length. Prior to being distributed to various end devices, each being connected with the time distribution device by cables of varying length, this overcompensated time reference may then be delayed by an amount based on the cable length connecting each respective end device such that the arrival of each of the synchronized time references at the various end devices is synchronized.

IPC Classes  ?

  • H04W 4/02 - Services making use of location information
  • H04W 56/00 - Synchronisation arrangements
  • H04W 64/00 - Locating users or terminals for network management purposes, e.g. mobility management

87.

POINT-TO-MULTIPOINT POLLING IN A MONITORING SYSTEM FOR AN ELECTRIC POWER DISTRIBUTION SYSTEM

      
Application Number US2014048018
Publication Number 2015/017246
Status In Force
Filing Date 2014-07-24
Publication Date 2015-02-05
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Bryson, Richard Paul, Jr.
  • Sagen, Eric

Abstract

An automation controller may wirelessly poll a plurality of remote monitoring devices configured to monitor an electric power distribution system and store monitored system data collected therefrom. The automation controller may be wirelessly coupled to the plurality of remote monitoring devices using a spread-spectrum protocol, such as Bluetooth®. The automation controller may gather monitored system data using Distributed Network Protocol (DNP3). DNP3 packets may be communicated as the payload of Bluetooth® packets. The spread-spectrum protocol may limit the number of devices to which the automation controller may be actively connected at one time. Accordingly, the automation controller may couple and uncouple from the remote monitoring devices in a round-robin pattern to collect the monitored system data from all of the remote monitoring devices. The automation controller may provide engineering access and/or collect relay event data using the spread-spectrum protocol and a high-bandwidth protocol.

IPC Classes  ?

  • G06F 11/00 - Error detection; Error correction; Monitoring

88.

DISTRIBUTED CONTROL IN ELECTRIC POWER DELIVERY SYSTEMS

      
Application Number US2014042806
Publication Number 2014/209688
Status In Force
Filing Date 2014-06-17
Publication Date 2014-12-31
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Zweigle, Gregary C.
  • Blood, Ellery A.

Abstract

This disclosure includes various systems and methods for determining an operating stage based on electrical conditions in electric power delivery systems and identifying a control strategy based upon the operating stage. The control strategy may be selected and customized to avoid or to ameliorate stresses in an electric power delivery system while maintaining the stability of electric power delivery systems. Various embodiments consistent with the present disclosure may include a distributed controller configured receive a plurality of indications of electrical conditions from a plurality of control devices in electrical communication with the electrical power delivery system. The distributed controller may determine an operating stage from among a plurality of operating stages based upon the plurality of indications of electrical conditions. The distributed controller may further identify a control strategy based upon the operating stage. The control strategy may be communicated to and implemented by the plurality of control devices.

IPC Classes  ?

  • H01H 47/00 - Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current

89.

SOURCE IMPEDANCE ESTIMATION

      
Application Number US2014040322
Publication Number 2014/204637
Status In Force
Filing Date 2014-05-30
Publication Date 2014-12-24
Owner SCHWEITZER ENGINEERING LABORATORIES, INC (USA)
Inventor
  • Allen, William F.
  • Haes, Dennis

Abstract

Disclosed herein are a variety of systems and methods for estimating a source impedance value. One embodiment may include an intelligent electronic device (IED) configured to interface with an electric power distribution system. The IED may include a communications interface, a processor, and a non-transitory computer-readable storage medium. The computer-readable storage medium may include software instructions executable on the processor that enable the IED to identify a source impedance modeling event at a node in the power distribution system. The software instructions may further enable the IED to receive a plurality of measurements representing an electrical condition at the node prior to the source impedance modeling event and subsequent to the source impedance modeling event. The IED may calculate a source impedance value based on the first plurality of measurements at the node. Based on the source impedance value, a control action may be generated.

IPC Classes  ?

  • G05F 1/70 - Regulating power factor; Regulating reactive current or power

90.

AUTOMATICALLY CONFIGURABLE INTELLIGENT ELECTRONIC DEVICE

      
Application Number US2014038409
Publication Number 2014/189785
Status In Force
Filing Date 2014-05-16
Publication Date 2014-11-27
Owner SCHWEITZER ENGINEERING LABORATORIES, INC (USA)
Inventor
  • Mynam, Mangapathirao Venkata
  • Guzman-Casillas, Armando

Abstract

Disclosed herein are intelligent electronic devices configured for monitoring an electric power deliver system and for determining a plurality of configuration settings based on measurements from the electric power delivery system. An lED may identify a configuration event, obtain a plurality of electrical parameters associated with the configuration event, determine a plurality of configuration parameters from the electrical parameters, determine a plurality of configuration settings based on the configuration parameters, and apply the settings to the lED. The lED may also be configured to initiate the configuration event by openina a single pole of a multi-phase power line.

IPC Classes  ?

  • G06F 19/00 - Digital computing or data processing equipment or methods, specially adapted for specific applications (specially adapted for specific functions G06F 17/00;data processing systems or methods specially adapted for administrative, commercial, financial, managerial, supervisory or forecasting purposes G06Q;healthcare informatics G16H)

91.

SYNCHRONIZED CLOCK EVENT REPORT

      
Application Number US2014034358
Publication Number 2014/179075
Status In Force
Filing Date 2014-04-16
Publication Date 2014-11-06
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor Sagen, Eric A.

Abstract

The present application discloses monitoring a plurality of time inputs to detect a defined time event and providing a report of the plurality of time inputs for analysis in response to detecting the defined time event. To create the report, an event monitor records data relating to the plurality of time inputs in a temporary memory for a defined window of time. In response to detecting the defined time event, the event monitor transfers the data recorded in the temporary memory to a persistent memory and continues to record data relating to the plurality of time inputs to the persistent memory for a second defined window of time. The event monitor provides a report of the data relating to the plurality of time inputs stored in the persistent memory for analysis.

IPC Classes  ?

  • G06F 13/00 - Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units

92.

MULTI-CONSTELLATION GNSS INTEGRITY CHECK FOR DETECTION OF TIME SIGNAL MANIPULATION

      
Application Number US2014010422
Publication Number 2014/158297
Status In Force
Filing Date 2014-01-07
Publication Date 2014-10-02
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor Achanta, Shankar, V.

Abstract

The present application discloses detecting manipulation of GNSS signals using a second time source. If two or more GNSS constellation signals are being detected, the phase error between the GNSS constellation signals may be monitored. When the phase error drifts, then manipulation is determined. The integrity of a GNSS constellation signal may be monitored using an internal time source such as a crystal oscillator by monitoring a slope of the free running counter at the detected rising edges of a pulse-per-second signal from the GNSS constellation. If more than two GNSS constellations are monitored, a voting scheme may be used to determine the manipulated GNSS constellation.

IPC Classes  ?

  • G01S 19/48 - Determining position by combining or switching between position solutions derived from the satellite radio beacon positioning system and position solutions derived from a further system

93.

ADAPTIVE TOPOLOGY ASSISTED PROTECTION AND CONTROL OF ELECTRIC POWER DELIVERY SYSTEMS

      
Application Number US2014031839
Publication Number 2014/160761
Status In Force
Filing Date 2014-03-26
Publication Date 2014-10-02
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Allen, William, F.
  • Haes, Dennis
  • Fazzari, Bryan, J.

Abstract

Disclosed are adaptive communication assisted protection and control. Local intelligent electronic devices (lEDs) associated with local switching devices and having unique IDs may transmit switch status and unique IDs to an area lED. The area lED may calculate topology using switch status, and provide control information to local lEDs using the topology. The area lED may communicate the unique ID of the local lED calculated to be immediately upstream of each local lED and, upon detection of a fault, the local lEDs may send blocking signals that include the received unique ID of the lED immediately upstream therefrom. The area lED may communicate control commands that include the unique IDs and control commands for the local lEDs to take the control action. Upon matching of the unique ID in the control command with its own unique ID, the local lEDs may take the control action and transmit remaining actions.

IPC Classes  ?

  • G06F 15/16 - Combinations of two or more digital computers each having at least an arithmetic unit, a program unit and a register, e.g. for a simultaneous processing of several programs

94.

SYSTEMS AND METHODS FOR MANAGING COMMUNICATION BETWEEN DEVICES IN AN ELECTRICAL POWER SYSTEM

      
Application Number US2014023169
Publication Number 2014/150406
Status In Force
Filing Date 2014-03-11
Publication Date 2014-09-25
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Day, Benjamin, S.
  • Bennett, Jerry, J.

Abstract

Systems and methods for managing communication between devices in an electric power generation and delivery system are disclosed. In certain embodiments, a method for managing communication between devices may include receiving a message including an identifier via a communications interface. In certain embodiments, the identifier may identify a particular publishing device. A determination may be made whether the message is a most recently received message associated with the identifier. If the message is the most recently received message, the message may be stored message in a message buffer associated with the identifier, and transmitted from a device using a suitable queuing methodology.

IPC Classes  ?

95.

TRANSMISSION OF DATA OVER A LOW-BANDWIDTH COMMUNICATION CHANNEL

      
Application Number US2014016955
Publication Number 2014/149309
Status In Force
Filing Date 2014-02-18
Publication Date 2014-09-25
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Kasztenny, Bogdan, Z.
  • Tibbals, Timothy, P.
  • Dolezilek, David, J.
  • Day, Benjamin, S.
  • Bradetich, Ryan
  • Bennett, Jerry, J.
  • Achanta, Shankar, V.

Abstract

Disclosed herein are various systems and methods that may improve the transmission of data over low-bandwidth communication channels in an electric power delivery system. Devices communicating across a low-bandwidth communication channel may implement several approaches, according to various embodiments disclosed herein, to reduce the data transmitted across the low-bandwidth communication channel and to prioritize the transmission of time-sensitive and/or more important information with respect to other data. Various embodiments disclosed herein may inspect packets to be transmitted across a low-bandwidth communication channel in order to identify high priority data. High priority data may be time-sensitive information, and accordingly, transmission of such data may be prioritized over other data in order to reduce transmission latency of the higher priority data.

IPC Classes  ?

  • G06F 15/173 - Interprocessor communication using an interconnection network, e.g. matrix, shuffle, pyramid, star or snowflake
  • H04L 12/12 - Arrangements for remote connection or disconnection of substations or of equipment thereof
  • H04L 12/16 - Arrangements for providing special services to substations

96.

STATE TRAJECTORY PREDICTION IN AN ELECTRIC POWER DELIVERY SYSTEM

      
Application Number US2014018666
Publication Number 2014/134164
Status In Force
Filing Date 2014-02-26
Publication Date 2014-09-04
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Zweigle, Gregary, C.
  • Hewitt, Eric, J.
  • Blood, Ellery, A.

Abstract

Disclosed is state trajectory prediction in an electric power delivery system. Electric power delivery system information is calculated from measurements by intelligent electronic devices (lEDs), and communicated to a state trajectory prediction system. The state trajectory prediction system may be configured to generate a load prediction profile. The load prediction profile may provide a predicted response of a load at a future time. Further, the state trajectory prediction system may be configured to generate a generator prediction profile that provides a predicted response of a generator at a future time. The state trajectory prediction system may generate a state trajectory prediction based, at least in part, on the load prediction profile and the generator prediction profile. The state trajectory prediction may represent a future state of the electric power delivery system.

IPC Classes  ?

  • G06F 15/16 - Combinations of two or more digital computers each having at least an arithmetic unit, a program unit and a register, e.g. for a simultaneous processing of several programs

97.

DETECTION OF POORLY DAMPED OSCILLATION MODES

      
Application Number US2014016521
Publication Number 2014/127257
Status In Force
Filing Date 2014-02-14
Publication Date 2014-08-21
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Venkatasubramanian, Vaithianathan
  • Tashman, Zaid
  • Khalilinia, Hamed

Abstract

A plurality of measurement signals may be evaluated to detect a poorly damped oscillation mode in an electric power delivery system. An oscillation mode of interest may be detected, and the oscillation mode of interest may be analyzed using a frequency transform. A plurality of amplitudes of the oscillation mode of interest in each measurement signal may be determined using a sliding window. The plurality of amplitudes may be used to calculate a damping of the oscillation mode of interest. The damping may be calculated solving a linearized system of equations. The linearized system of equations may be a least square estimate of the damping based on the logarithm of each amplitude. If the damping indicates that the oscillation mode of interest is poorly damped, a control action may be taken.

IPC Classes  ?

  • G06F 1/26 - Power supply means, e.g. regulation thereof
  • G06F 1/28 - Supervision thereof, e.g. detecting power-supply failure by out of limits supervision
  • G06F 17/10 - Complex mathematical operations

98.

MULTI-CONSTELLATION GNSS INTEGRITY CHECK FOR DETECTION OF TIME SIGNAL MANIPULATION

      
Application Number US2014010507
Publication Number 2014/113240
Status In Force
Filing Date 2014-01-07
Publication Date 2014-07-24
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor Achanta, Shankar, V.

Abstract

The present application discloses detecting manipulation of GNSS signals using a second time source. If two or more GNSS constellation signals are being detected, the phase error between the GNSS constellation signals may be monitored. When the phase error drifts, then manipulation is determined. The integrity of a GNSS constellation signal may be monitored using an internal time source such as a crystal oscillator by monitoring a slope of the free running counter at the detected rising edges of a pulse-per-second signal from the GNSS constellation. If more than two GNSS constellations are monitored, a voting scheme may be used to determine the manipulated GNSS constellation.

IPC Classes  ?

99.

PREVENTING OUT-OF-SYNCHRONISM RECLOSING BETWEEN POWER SYSTEMS

      
Application Number US2013078093
Publication Number 2014/107415
Status In Force
Filing Date 2013-12-27
Publication Date 2014-07-10
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Kasztenny, Bogdan, Z.
  • Finney, Dale, S.

Abstract

The present disclosure provides apparatus, systems, and methods for preventing out-of-synchronism closing between power systems. An intelligent electronic device (IED) apparatus may include a control component and a delay component. The control component is configured to selectively control opening and closing of a breaker. The control component selectively outputs a close signal to cause the breaker to connect a first portion of a power delivery system to another portion of the power delivery system. The delay component is configured to delay output of the close signal to the breaker. The delay component includes circuitry independent from control by the control component and the delay component is inconfigurable from a remote location.

IPC Classes  ?

  • H02H 3/02 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection - Details

100.

RECORDING OF OPERATING PARAMETERS OF AN INTELLIGENT ELECTRONIC DEVICE

      
Application Number US2013067224
Publication Number 2014/070712
Status In Force
Filing Date 2013-10-29
Publication Date 2014-05-08
Owner SCHWEITZER ENGINEERING LABORATORIES, INC. (USA)
Inventor
  • Schweitzer, Edmund, O., Iii
  • Schwartz, Ronald, A.
  • Whitehead, David, E.

Abstract

The present disclosure provides systems and methods for recording operating parameters of an intelligent electronic device (lED). A system may include a parameter acquisition module, a parameter storage module, and a memory management module. The parameter acquisition module may be configured to periodically obtain operating parameters of an lED at a first interval. The first interval may have a first time length to provide a first resolution of operation of the lED. The parameter storage module may be configured to store the operating parameters. The memory management module may be configured to delete, outside a first resolution period, a first portion of the operating parameters while maintaining a second portion of the operating parameters. The second portion may include operating parameters for each of a second interval. The second interval may have a second time length to provide a reduced second resolution of the operation of the lED.

IPC Classes  ?

  • G05B 15/02 - Systems controlled by a computer electric
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