-
公开(公告)号：US11018497B2
公开(公告)日：2021-05-25
申请号：US16837522
申请日：2020-04-01
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Marcos A. Donolo , Jay Hartshorn
Abstract: In-phase transfer of an electric power source to a load bus from a first feeder to a second feeder is disclosed herein. Voltage phase difference, voltage frequency difference, and voltage rate-of-change of frequency difference, between the second feeder and the load bus are used along with a breaker delay time to determine whether the breaker will close while the phase of the second feeder and the load bus are within an acceptable range. One or more breaker close time checks may be performed, including a breaker close time consistency check and a breaker close time uncertainty check.
-
公开(公告)号：US11381084B1
公开(公告)日：2022-07-05
申请号：US17494190
申请日：2021-10-05
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Marcos A. Donolo , Jay Hartshorn , Veselin Skendzic , Chandrasekaran Swaminathan , Vinod K. Yedidi , Angelo D'Aversa , Hang Li , Subhash C. Patel
Abstract: A method includes receiving electrical measurements of an input signal of a power system. The method includes determining an estimated frequency of the power system using a rate of change of phase of the power system and using zero crossings of the power system. Selection between using the rate of change of phase of the power system and using zero crossings of the power system is based on a comparison between an estimated phase angle and a measured phase angle of the power system.
-
公开(公告)号：US20200328591A1
公开(公告)日：2020-10-15
申请号：US16837522
申请日：2020-04-01
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Marcos A. Donolo , Jay Hartshorn
Abstract: In-phase transfer of an electric power source to a load bus from a first feeder to a second feeder is disclosed herein. Voltage phase difference, voltage frequency difference, and voltage rate-of-change of frequency difference, between the second feeder and the load bus are used along with a breaker delay time to determine whether the breaker will close while the phase of the second feeder and the load bus are within an acceptable range. One or more breaker close time checks may be performed, including a breaker close time consistency check and a breaker close time uncertainty check.
-
公开(公告)号：US12244135B2
公开(公告)日：2025-03-04
申请号：US18056087
申请日：2022-11-16
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Marcos A. Donolo , Jay Hartshorn , Anushka M. Dissanayake , Pallavi Kulkarni , Veselin Skendzic , Vinod K. Yedidi , Subhash C. Patel , Angelo D'Aversa
Abstract: Signal transducers in electrical communication with shorted leads of current transformers are used to provide monitoring and protection functions to an electric power delivery system. Differential protection is performed by comparing a predetermined threshold against a voltage signal from series-connected leads of signal transducers in electrical communication with shorted leads of current transformers. The signal transducers may be Rogowski coils. Signal transducers in communication with shorted leads may be used to improve safety and increase performance of the current transformers by decreasing susceptibility to saturation.
-
公开(公告)号：US20240250518A1
公开(公告)日：2024-07-25
申请号：US18419092
申请日：2024-01-22
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Normann Fischer , Anushka M. Dissanayake , Jay Hartshorn , Marcos A. Donolo
CPC classification number: H02H7/045 , H02H1/0007 , H02H7/042
Abstract: A system for high-impedance differential protection for power systems using a variety of signals from the power system. A fault may be detected using filtered phase current or filtered phase voltage magnitudes from current transformers (CTs) connected in parallel by phase. A fault may be detected using filtered phase voltages and raw phase voltages from the CTs. A fault may be detected using raw phase currents and raw phase voltages from the CTs. A fault may be detected using filtered phase currents and raw phase currents. A fault may be detected using raw phase currents and raw neutral currents. The embodiments herein maintain dependability and security of a differential element even when low-class CTs are used. The embodiments herein may allow users to optimize pickup settings even when low-class CTs are used.
-
Patent Agency Ranking
公开(公告)号：US11469588B2
公开(公告)日：2022-10-11
申请号：US17411335
申请日：2021-08-25
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Marcos A. Donolo , Andrea Di Tomasso , Yusuf Zafer Korkmaz , Jay Hartshorn
Abstract: Differential protection of electric power delivery system equipment using a compensated operating signal under spurious conditions is disclosed herein. Current transformers (CTs) may provide spurious current signals under certain operating conditions resulting in unintended operation of differential protection. The present disclosure uses a compensated operating signal during such conditions. The compensated operating signal is calculated using operate current and a difference between direct current content of currents obtained from the CTs. Switching between use of the operate current and the compensated operating signal is based on a comparison of the average direct current content of the CTs and a threshold.
-
公开(公告)号：US20200096546A1
公开(公告)日：2020-03-26
申请号：US16569702
申请日：2019-09-13
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Marcos A. Donolo , Jay Hartshorn
Abstract: Systems and methods may be used to measure a frequency of a power delivery system and/or of a supply signal transmitted to a load. A system may record an input waveform, determine a frequency of the input waveform at a present time based at least in part on the input waveform and a derivative of the input waveform, and control an operation of a power delivery system based at least in part on the determined frequency.
-
公开(公告)号：US11754602B2
公开(公告)日：2023-09-12
申请号：US17545385
申请日：2021-12-08
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Marcos A. Donolo , Jay Hartshorn
CPC classification number: G01R23/02 , G01R23/005 , H03M1/12
Abstract: Systems and methods may be used to measure a frequency of a power delivery system and/or of a supply signal transmitted to a load. A system may record an input waveform, determine a frequency of the input waveform at a present time based at least in part on the input waveform and a derivative of the input waveform, and control an operation of a power delivery system based at least in part on the determined frequency.
-
公开(公告)号：US20220099717A1
公开(公告)日：2022-03-31
申请号：US17545385
申请日：2021-12-08
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Marcos A. Donolo , Jay Hartshorn
Abstract: Systems and methods may be used to measure a frequency of a power delivery system and/or of a supply signal transmitted to a load. A system may record an input waveform, determine a frequency of the input waveform at a present time based at least in part on the input waveform and a derivative of the input waveform, and control an operation of a power delivery system based at least in part on the determined frequency.
-
公开(公告)号：US20220069566A1
公开(公告)日：2022-03-03
申请号：US17411335
申请日：2021-08-25
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Marcos A. Donolo , Andrea Di Tomasso , Yusuf Zafer Korkmaz , Jay Hartshorn
Abstract: Differential protection of electric power delivery system equipment using a compensated operating signal under spurious conditions is disclosed herein. Current transformers (CTs) may provide spurious current signals under certain operating conditions resulting in unintended operation of differential protection. The present disclosure uses a compensated operating signal during such conditions. The compensated operating signal is calculated using operate current and a difference between direct current content of currents obtained from the CTs. Switching between use of the operate current and the compensated operating signal is based on a comparison of the average direct current content of the CTs and a threshold.
-
-
-
-
-
-
-
-
-
Search Results
16
records
(took 0.031 seconds)
