公开(公告)号：US20200067445A1

公开(公告)日：2020-02-27

申请号：US16275696

申请日：2019-02-14

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Ritwik Chowdhury ,  Dale S. Finney

IPC: H02P29/024 ,  G01R31/34 ,  G01R31/02

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：US10333291B2

公开(公告)日：2019-06-25

申请号：US16106567

申请日：2018-08-21

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Ritwik Chowdhury ,  Dale S. Finney

IPC: H02H7/06 ,  H02H1/00 ,  G01R31/02 ,  G01R31/34

Abstract: Detection and protection against electric power generator stator ground fault conditions in multiple-generator high-impedance grounded installations is provided herein. In one embodiment, a generator protection element may block a determination of a fault using third harmonic voltages when the third harmonic voltage from the generator is less than a factor of the maximum third harmonic voltage from all of the generators on the common bus. A tripping subsystem may issue a trip command based upon detection of a stator ground fault condition.

公开(公告)号：US20250132599A1

公开(公告)日：2025-04-24

申请号：US18490145

申请日：2023-10-19

Applicant: Schweitzer Engineering Laboratories, Inc.

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

IPC: H02J13/00 ,  H02H1/00

Abstract: The present application relates to generating adaptive protective relay event reports. In one embodiment, a system comprises a power system response subsystem to monitor electrical parameters in an electric power system and to receive a trigger signal from a trigger source based on identification of an event in an electric power system. An adaptive event report subsystem is configured to generate an adaptive report depending on the trigger related to the event and based on a pre-trigger start, a duration, and a sampling rate. The adaptive event report comprises at least one electrical parameter related to the event beginning at a time established by the pre-trigger start, covering an interval established by the duration, and recorded at the sampling rate.

公开(公告)号：US11946966B1

公开(公告)日：2024-04-02

申请号：US18171475

申请日：2023-02-20

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Ritwik Chowdhury ,  Jason Andrew Young ,  Jon Steinmetz ,  Rogerio Scharlach ,  Satish Samineni

IPC: G01R31/08 ,  G01R31/52

CPC classification number: G01R31/086 ,  G01R31/088 ,  G01R31/52

Abstract: Disclosed are systems and methods to determine a direction to a ground fault of an electrical generator or motor using a known steady-state standing error referenced to a positive-sequence voltage measurement to determine a system standing error and utilizing the system standing error to determine an operating current with anomalies attributable to a fault. A ground fault may be determined using zero-sequence voltage signals from the generator or motor installation. The operating current, along with the zero-sequence voltage, may be used to determine a direction to the fault. The generator or motor may be high-impedance grounded. The systems and methods further indicate the direction to a fault where multiple generators or motors are connected to a common bus.

公开(公告)号：US11735908B2

公开(公告)日：2023-08-22

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 ,  H02J3/00 ,  H02H1/00

CPC classification number: H02H7/22 ,  H02H1/0007 ,  H02J3/0012

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：US11631972B2

公开(公告)日：2023-04-18

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: G01R31/34 ,  H02H1/00 ,  G05B19/042 ,  H02H7/04 ,  G01R31/62

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：US11575253B2

公开(公告)日：2023-02-07

申请号：US16872636

申请日：2020-05-12

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Ritwik Chowdhury ,  Gabriel Benmouyal ,  Carolyn Sun

IPC: H02H1/00 ,  H02H3/02 ,  G05B9/02 ,  G05B17/02

Abstract: Systems and methods to estimate trapped charge for a controlled automatic reclose of a power line using a ganged switching device are described herein. For example, an intelligent electronic device (IED) may calculate a voltage amount associated with trapped charge of each phase of a power line based on voltage measurements of the power line. The IED may send a signal to close a ganged switching device at a time based at least in part on the trapped charge of each phase of a power line.

公开(公告)号：US20190097418A1

公开(公告)日：2019-03-28

申请号：US16106567

申请日：2018-08-21

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Ritwik Chowdhury ,  Dale S. Finney

IPC: H02H7/06 ,  G01R31/34 ,  G01R31/02 ,  H02H1/00

CPC classification number: H02H7/06 ,  G01R31/025 ,  G01R31/346 ,  H02H1/0007

Abstract: Detection and protection against electric power generator stator ground fault conditions in multiple-generator high-impedance grounded installations is provided herein. In one embodiment, a generator protection element may block a determination of a fault using third harmonic voltages when the third harmonic voltage from the generator is less than a factor of the maximum third harmonic voltage from all of the generators on the common bus. A tripping subsystem may issue a trip command based upon detection of a stator ground fault condition.

公开(公告)号：US11996688B2

公开(公告)日：2024-05-28

申请号：US17318440

申请日：2021-05-12

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Gabriel Benmouyal ,  Ritwik Chowdhury

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

CPC classification number: H02H7/04 ,  G05B19/0428 ,  H02H1/0007 ,  H02H1/0092 ,  G05B2219/21155

Abstract: An intelligent electronic device (IED) may obtain a voltage measurement matrix based on an arrangement of a transformer in a power system. The IED 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 IED 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 IED 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：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

IPC: H02J13/00 ,  H02B1/30 ,  H02H1/00

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.