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：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：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.