公开(公告)号：US12176716B2

公开(公告)日：2024-12-24

申请号：US18459691

申请日：2023-09-01

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Ritwik Chowdhury ,  Douglas I. Taylor ,  Normann Fischer

IPC: H02J3/24 ,  H02H7/22 ,  H02J3/00 ,  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.

公开(公告)号：US20240072697A1

公开(公告)日：2024-02-29

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

CPC classification number: H02P9/006 ,  H02P2103/20

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：US20220385058A1

公开(公告)日：2022-12-01

申请号：US17318440

申请日：2021-05-12

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Gabriel Benmouyal ,  Ritwik Chowdhury

IPC: H02H7/04 ,  H02H1/00 ,  G05B19/042

Abstract: An intelligent electronic device (IED) may obtain a voltage measurement matrix based on an arrangement of a transformer in a power system. The TED may obtain a delta connection compensating angle based on the location of the circuit breaker and the transformer arrangement. The IED may obtain voltage measurements of the transformer. The TED may determine a residual flux value of the transformer based at least in part on the voltage measurements, the voltage measurement matrix and the delta connection compensating angle. The TED may send a signal to a circuit breaker of the transformer to connect the transformer to the power system based at least in part on the system voltage and residual flux value.

公开(公告)号：US20220263310A1

公开(公告)日：2022-08-18

申请号：US17670864

申请日：2022-02-14

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Brett Mitchell Cockerham ,  Ritwik Chowdhury ,  John C. Town

IPC: H02H7/22 ,  H02H1/00 ,  H02J3/00

Abstract: Systems and methods are described herein to detect an open-phase condition associated with an inverter-based resource for electric power generation within an electric power delivery system. An electric power delivery system may include one or more inverter-based resources that provide three phased electric power to one or more loads of an electric utility. A controller may include circuitry to measure voltage unbalances between different phases, high voltage sequences, phase voltage waveform harmonic distortions, voltage levels, and current levels to dependably detect an open-phase condition of the electric power delivery system.

公开(公告)号：US10797632B2

公开(公告)日：2020-10-06

申请号：US16275696

申请日：2019-02-14

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Ritwik Chowdhury ,  Dale S. Finney

IPC: G01R31/14 ,  H02P29/024 ,  G01R31/34 ,  G01R31/50

Abstract: Disclosed are systems and methods to determine a direction to a fault of an electrical generator using sensitive current. A ground fault is determined using voltage signals from the generator installation. Incremental residual values of the sensitive current, along with the voltage, are used to determine a direction to the fault. The generator may be high-impedance grounded. The systems and methods further indicate the direction to a fault where multiple generators are connected using a common generation bus.

公开(公告)号：US11476655B2

公开(公告)日：2022-10-18

申请号：US16742039

申请日：2020-01-14

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Ritwik Chowdhury ,  Gabriel Benmouyal ,  Carolyn Sun

IPC: H02H1/00 ,  H02J3/04 ,  H02J13/00 ,  H02H3/00 ,  G01R19/00 ,  G01R31/58 ,  G01R29/24 ,  G05B19/042

Abstract: Systems and methods to estimate trapped charge for a controlled automatic reclose are described herein. For example, an intelligent electronic device (IED) may calculate an analog amount of trapped charge of each phase of a power line based on voltage measurements of the power line. The IED may close a switching device of each phase at a time corresponding to a point-on-wave associated with the analog amount of trapped charge of the respective phase.

公开(公告)号：US11177645B2

公开(公告)日：2021-11-16

申请号：US16692074

申请日：2019-11-22

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Ritwik Chowdhury ,  Matchyaraju Alla ,  Vinod K. Yedidi ,  Jakov Vico ,  Wasif Ahmad

IPC: H02H3/16 ,  H01F27/40 ,  H02H3/33

Abstract: A transformer system including a transformer including a set of wye windings, a three-phase current transformer, a neutral-current transformer, and a controller. The three-phase current transformer outputs a first signal indicative of a three-phase current conducting through the set of wye windings and the three-phase current transformer. The neutral-current transformer couples the current flowing from the ground to the neutral node of the transformer, and outputs a second signal indicative of a neutral current conducting from the ground node to the neutral node of the transformer. The controller receives the first signal and the second signal, determines whether an external ground fault condition or an internal ground fault condition is present based on the three-phase current and the neutral current, and determines whether a wiring error is present for the three-phase current transformer or the neutral-current transformer based on the three-phase current and the neutral current.

公开(公告)号：US20210218239A1

公开(公告)日：2021-07-15

申请号：US16742039

申请日：2020-01-14

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Ritwik Chowdhury ,  Gabriel Benmouyal ,  Carolyn Sun

IPC: H02H1/00 ,  H02J13/00 ,  G01R19/00 ,  G01R31/58 ,  G01R29/24 ,  G05B19/042 ,  H02H3/00 ,  H02J3/04

Abstract: Systems and methods to estimate trapped charge for a controlled automatic reclose are described herein. For example, an intelligent electronic device (IED) may calculate an analog amount of trapped charge of each phase of a power line based on voltage measurements of the power line. The IED may close a switching device of each phase at a time corresponding to a point-on-wave associated with the analog amount of trapped charge of the respective phase.

公开(公告)号：US20210159691A1

公开(公告)日：2021-05-27

申请号：US16692074

申请日：2019-11-22

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Ritwik Chowdhury ,  Matchyaraju Alla ,  Vinod K. Yedidi ,  Jakov Vico ,  Wasif Ahmad

IPC: H02H3/16 ,  H02H3/33 ,  H01F27/40

Abstract: A transformer system including a transformer including a set of wye windings, a three-phase current transformer, a neutral-current transformer, and a controller. The three-phase current transformer outputs a first signal indicative of a three-phase current conducting through the set of wye windings and the three-phase current transformer. The neutral-current transformer couples the current flowing from the ground to the neutral node of the transformer, and outputs a second signal indicative of a neutral current conducting from the ground node to the neutral node of the transformer. The controller receives the first signal and the second signal, determines whether an external ground fault condition or an internal ground fault condition is present based on the three-phase current and the neutral current, and determines whether a wiring error is present for the three-phase current transformer or the neutral-current transformer based on the three-phase current and the neutral current.

公开(公告)号：US20210067072A1

公开(公告)日：2021-03-04

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 ,  H02P9/02 ,  G01R31/62 ,  G01R19/252

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.