-
公开(公告)号：US20240022112A1
公开(公告)日：2024-01-18
申请号：US17812041
申请日：2022-07-12
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Ritwik Chowdhury , Dale S. Finney , Normann Fischer
CPC classification number: H02J13/00036 , H02B1/30 , H02J13/00002 , H02H1/0061
Abstract: Breaker control units (BCUs) may include an output to selectively cause a circuit breaker (CB) to open and close a circuit, a voltage input to monitor a voltage of at least one of a bus and a line, a processor to calculate a point-on-wave switching time, and a remote input configured to be coupled to a remote intelligent electronic device (IED) to receive commands to selectively open and close the CB at a specified optimal time. Electric power systems may include such BCUs. Methods of switching CBs may include monitoring at least one of a bus and a line with a BCU and controlling switching of the CB at a predetermined point-on-wave value with onboard electronics of the BCU. The methods may additionally include calculating a trapped charge and/or a residual flux with an IED and causing the BCU to switch the CB at a specific optimum point-on-wave value.
-
22.发明授权公开(公告)号：US11411390B2
公开(公告)日：2022-08-09
申请号：US17139393
申请日：2020-12-31
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Ritwik Chowdhury , Matchyaraju Alla , Satish Samineni , Normann Fischer , Dale S. Finney
Abstract: Detection of, and protection against faults within a restricted earth fault (REF) zone of a transformer or a generator is disclosed herein. Security of the REF protection element uses comparison of a negative-sequence reference quantity. The REF condition is only detected when there is sufficient ground involvement and a fault in the reverse detection has not been detected. Dependability of the REF protection element in low-impedance grounded systems is improved by ensuring that the element operates when a zero-sequence reference quantity and a neutral operate quantity are orthogonal to each other. The REF protection element further determines an open CT condition and blocks detection of an REF fault upon determination of the open CT condition. A tripping subsystem may issue a trip command based upon detection of the REF condition.
-
公开(公告)号：US20220190581A1
公开(公告)日：2022-06-16
申请号：US17123450
申请日：2020-12-16
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Ritwik Chowdhury , Dale S. Finney , Normann Fischer , Matchyaraju Alla
IPC: H02H1/00 , G05B19/042 , G01R31/34 , G01R31/62 , H02H7/04
Abstract: The present disclosure relates to systems and methods for protecting against and mitigating the effects of over-excitation of elements in electric power systems. In one embodiment, a system consistent with the present disclosure may comprise a point pair subsystem to receive a plurality of point pairs that define an over-excitation curve for a piece of monitored equipment. The system may receive a plurality of measurements corresponding to electrical conditions associated with the piece of monitored equipment. A logarithmic interpolation subsystem may determine a logarithmic interpolation corresponding to one of the plurality of measurements based on the plurality of point pairs. An over-excitation detection subsystem may detect an over-excitation condition based on the logarithmic interpolation, and a protective action subsystem may implement a protective action based on the over-excitation condition.
-
公开(公告)号：US11316455B2
公开(公告)日：2022-04-26
申请号：US17003477
申请日：2020-08-26
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Matchyaraju Alla , Ritwik Chowdhury , Normann Fischer , Dale S. Finney , Rogerio Scharlach
IPC: H02P9/00 , G01R31/62 , G01R19/252 , H02P9/02
Abstract: Detection and protection against electric power generator rotor turn-to-turn faults, rotor multi-point-to-ground faults, and rotor permanent magnet faults is provided herein. A fractional harmonic signal is used to determine the rotor fault condition. The fractional harmonic signal may be a fractional harmonic magnitude of the circulating current of one phase. The fractional harmonic may be a fractional harmonic magnitude of a neutral voltage. A tripping subsystem may issue a trip command based upon detection of a rotor turn-to-turn fault condition.
-
公开(公告)号：US20190113575A1
公开(公告)日：2019-04-18
申请号：US15783925
申请日：2017-10-13
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Dale S. Finney , Normann Fischer , Derrick Haas
Abstract: The present disclosure relates to systems and methods for detecting transient high-torque events associated with rotating machinery in an electric power system. In one embodiment, a relay may comprise an electrical parameters module configured to receive a representation of a voltage and a current at a terminal of rotating machinery in an electric power system. A torque calculation module may be configured to continuously determine a calculated torque value for the rotating machinery using the representation of the voltage and the current at the terminal of the rotating machinery; and to compare each calculated torque value to a threshold. An action module may be configured to generate an alarm when the calculated torque value exceeds the threshold. A log module may be configured to generate a log comprising a peak of the calculated torque value and a time at which the peak torque value occurs.
-
Patent Agency Ranking
公开(公告)号：US09128140B2
公开(公告)日：2015-09-08
申请号：US14477495
申请日：2014-09-04
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Normann Fischer , Amandeep Singh Kalra
CPC classification number: G01R31/08 , G01R31/085 , G01R31/086 , G01R31/088 , H02H3/165 , Y04S10/522
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.
Abstract translation: 本文公开了包括多个馈线和总线的未接地配电系统中的故障的检测。 与本公开一致的实施例可以监测与未接地电力分配系统中的多个馈线和总线中的每一个相关联的电参数。 可以使用所监视的电参数来确定所监视的电参数的增量变化。 此外，增量变化可以与多个馈送器的第一子集相关联。 可以使用来自总线的参考数量来计算进给器的扭矩值，其中显示出高于阈值的增量变化。 可以识别在多个馈送器的第一子集中具有最大增量变化的馈线。 可以基于扭矩和增量变化来识别故障。
-
公开(公告)号：US12249948B2
公开(公告)日：2025-03-11
申请号：US17823344
申请日：2022-08-30
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Ritwik Chowdhury , Matchyaraju Alla , Normann Fischer , Dale S. Finney
IPC: H02P9/00 , H02P103/20
Abstract: The present disclosure pertains to devices, systems, and methods for monitoring a generator. In one embodiment, the system may include a measurement subsystem to receive a plurality of split-phase measurements of branch currents associated with the at least one generator. A split-phase transverse differential monitoring subsystem may receive the plurality of split-phase measurements of branch currents associated with the at least one generator and may generate an offset value representing a standing split-phase current. A protective action subsystem may generate a first protective action based on the phasor operating current.
-
公开(公告)号：US20240097449A1
公开(公告)日：2024-03-21
申请号：US18459691
申请日：2023-09-01
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Ritwik Chowdhury , Douglas I. Taylor , Normann Fischer
CPC classification number: H02J3/241 , H02H7/226 , H02J3/0012 , H02J3/00125 , H02J3/01
Abstract: The present application discloses systems and methods related to protection of a reactor in an alternating current (AC) electric power system. In one embodiment, a system may include a protective action subsystem to implement a protective action based on identification of a fault condition associated with a reactor. A frequency determination subsystem may determine when a frequency of the AC voltage is outside of a range defined by a lower threshold and an upper threshold and may identify a change in the frequency associated with de-energization of a line in electrical communication with the reactor. A supervisory subsystem may restrain implementation of the protective action when the frequency is outside of the range or when the change in the frequency is associated with de-energization of the line in electrical communication with the reactor.
-
29.发明申请公开(公告)号：US20220209525A1
公开(公告)日：2022-06-30
申请号：US17139393
申请日：2020-12-31
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Ritwik Chowdhury , Matchyaraju Alla , Satish Samineni , Normann Fischer , Dale S. Finney
Abstract: Detection of, and protection against faults within a restricted earth fault (REF) zone of a transformer or a generator is disclosed herein. Security of the REF protection element uses comparison of a negative-sequence reference quantity. The REF condition is only detected when there is sufficient ground involvement and a fault in the reverse detection has not been detected. Dependability of the REF protection element in low-impedance grounded systems is improved by ensuring that the element operates when a zero-sequence reference quantity and a neutral operate quantity are orthogonal to each other. The REF protection element further determines an open CT condition and blocks detection of an REF fault upon determination of the open CT condition. A tripping subsystem may issue a trip command based upon detection of the REF condition.
-
公开(公告)号：US11143715B2
公开(公告)日：2021-10-12
申请号：US16993496
申请日：2020-08-14
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Jordan Bell , Kanchanrao Gangadhar Dase , Sajal Harmukh , Normann Fischer , Daqing Hou
Abstract: Disclosed herein are systems for determining a broken conductor condition in a multiple-phase electric power delivery system. It has been observed that broken conductors pose a safety concern when occurring in the presence of people or vulnerable environmental conditions. Broken conductor conditions disclosed herein may be used to detect and trip the phase with the broken conductor, thus reducing or even eliminating the safety risk. Further, a distance to the opening may be determined.
-
-
-
-
-
-
-
-
-
Search Results
35
records
(took 0.019 seconds)
