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公开(公告)号：US20220131366A1
公开(公告)日：2022-04-28
申请号：US17647259
申请日：2022-01-06
Applicant: Schweitzer Engineering Laboratories, Inc
Inventor： Edmund O. Schweitzer, III , David E. Whitehead , Tony J. Lee , Krishnanjan Gubba Ravikumar
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.
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公开(公告)号：US11119128B2
公开(公告)日：2021-09-14
申请号：US16919896
申请日：2020-07-02
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Edmund O. Schweitzer, III , David E. Whitehead , Krishnanjan Gubba Ravikumar , Austin Edward Wade
Abstract: Systems and methods to test an electric power delivery system include a communication subsystem to transmit test signals to one or more merging units, a test subsystem to transmit a test data stream to the one or more merging units via the communication subsystem, and a processor subsystem to receive looped back data from the one or more merging unit in response to the transmitted test data stream and to determine an operating condition based on the looped back data.
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公开(公告)号：US11108737B2
公开(公告)日：2021-08-31
申请号：US16832816
申请日：2020-03-27
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Edmund O. Schweitzer, III , Krishnanjan Gubba Ravikumar , Austin Edward Wade , Tony J. Lee , David J. Casebolt , David E. Whitehead
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.
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公开(公告)号：US20210109139A1
公开(公告)日：2021-04-15
申请号：US16919896
申请日：2020-07-02
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Edmund O. Schweitzer, III , David E. Whitehead , Krishnanjan Gubba Ravikumar , Austin Edward Wade
Abstract: Systems and methods to test an electric power delivery system include a communication subsystem to transmit test signals to one or more merging units, a test subsystem to transmit a test data stream to the one or more merging units via the communication subsystem, and a processor subsystem to receive looped back data from the one or more merging unit in response to the transmitted test data stream and to determine an operating condition based on the looped back data.
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公开(公告)号：US10581237B2
公开(公告)日：2020-03-03
申请号：US15294580
申请日：2016-10-14
Applicant: Schweitzer Engineering Laboratories, Inc.
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.
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Patent Agency Ranking
公开(公告)号：US10310004B2
公开(公告)日：2019-06-04
申请号：US15269904
申请日：2016-09-16
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Edmund O. Schweitzer, III , Mangapathirao Venkata Mynam , David E. Whitehead , Bogdan Z. Kasztenny , Armando Guzman-Casillas , Veselin Skendzic
Abstract: The present disclosure relates to detection of faults in an electric power system. In one embodiment, 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. The traveling wave subsystem also determines a second index between an arrival maximum of the traveling wave at the second terminal and an exit maximum of the traveling wave. An operating quantity and a restraint quantity may be determined based on a magnitude of the representations of electrical conditions in the first index and the second index. A fault may be declared based on a comparison of the operating quantity and the restraint quantity. A protective action subsystem may be configured to implement a protective action based on the declaration of the fault.
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公开(公告)号：US20180212421A1
公开(公告)日：2018-07-26
申请号：US15269904
申请日：2016-09-16
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Edmund O. Schweitzer, III , Mangapathirao Venkata Mynam , David E. Whitehead , Bogdan Z. Kasztenny , Armando Guzman-Casillas , Veselin Skendzic
CPC classification number: G01R31/11 , G01R31/085 , H02H1/0007 , H02H1/0092 , H02H3/083 , H02H7/263 , H02H7/265
Abstract: The present disclosure relates to detection of faults in an electric power system. In one embodiment, 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. The traveling wave subsystem also determines a second index between an arrival maximum of the traveling wave at the second terminal and an exit maximum of the traveling wave. An operating quantity and a restraint quantity may be determined based on a magnitude of the representations of electrical conditions in the first index and the second index. A fault may be declared based on a comparison of the operating quantity and the restraint quantity. A protective action subsystem may be configured to implement a protective action based on the declaration of the fault.
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公开(公告)号：US20180106851A1
公开(公告)日：2018-04-19
申请号：US15783965
申请日：2017-10-13
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Edmund O. Schweitzer, III , Shankar V. Achanta , David E. Whitehead
CPC classification number: G01R31/086 , G01R1/00 , G01R19/2513 , G01R31/024 , H02J1/00 , H04L1/00 , H04L29/02
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.
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公开(公告)号：US09760062B2
公开(公告)日：2017-09-12
申请号：US14056170
申请日：2013-10-17
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Shankar V. Achanta , David E. Whitehead , Henry Loehner
Abstract: Systems and methods for detecting the failure of a precision time source using an independent time source are disclosed. Additionally, detecting the failure of a GNSS based precision time source based on a calculated location of a GNSS receiver is disclosed. Moreover, the system may be further configured to distribute a time derived from the precision time source as a precision time reference to time dependent devices. In the event of a failure of the precision time source, the system may be configured to distribute a time derived from a second precision time source as the precision time signal during a holdover period.
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40.发明申请公开(公告)号：US20170195362A1
公开(公告)日：2017-07-06
申请号：US15394097
申请日：2016-12-29
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Edmund O. Schweitzer, III , Cody W. Tews , David E. Whitehead
CPC classification number: H04L63/1466 , G06F11/0709 , G06F11/0793 , H04L43/0852 , H04L43/16 , H04L63/1441 , H04L2463/121 , Y04S40/168
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.
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