公开(公告)号：US10819261B1

公开(公告)日：2020-10-27

申请号：US16732838

申请日：2020-01-02

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Ritwik Chowdhury ,  Dale S. Finney ,  Normann Fischer

IPC: H02P9/00 ,  H03K17/082 ,  H02M7/5387 ,  H02H3/08 ,  G01R31/02 ,  G01R29/16

Abstract: Electric power generator protection is secured by detecting wiring errors to an intelligent electronic device using terminal third voltages at the terminal (VT3) and third harmonic voltages at the neutral (VN3). When an angle between VT3 and VN3 is outside of an acceptable range, a wiring defect is detected, and certain protective operations are blocked. An alarm may be generated, facilitating personnel to identify and rectify the wiring defect. Wiring defects may further be detected when a torque calculated using VT3 and VN3 exceeds a predetermined error threshold. Security of protection elements is increased by detection of wiring defects that may have resulted in misoperation of the protection elements.

公开(公告)号：US20190271725A1

公开(公告)日：2019-09-05

申请号：US15910226

申请日：2018-03-02

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Ritwik Chowdhury ,  Dale S. Finney

IPC: G01R19/165 ,  G01R19/25 ,  H02H7/045 ,  H02J3/44 ,  H02P9/10

Abstract: Disclosed are systems and methods to determine an overexcitation condition on electric power delivery system equipment that includes a magnetizing core. Overexcitation conditions are determined even during sub-synchronous resonance, ferro-resonance, and other complex events. Power system voltage is integrated and normalized to determine a flux on the magnetizing core. The flux is compared with a protection model to determine the overexcitation condition on the magnetizing core. Once an overexcitation condition is detected, a protective action may be taken to remove power from the effected power delivery system equipment.

公开(公告)号：US20190097417A1

公开(公告)日：2019-03-28

申请号：US16106538

申请日：2018-08-21

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Ritwik Chowdhury ,  Dale S. Finney

IPC: H02H7/06 ,  F01D15/10 ,  G01R31/34 ,  G01R31/02 ,  H02H3/16

Abstract: Detection of electric power generator stator ground fault conditions and protection of the generator due to such conditions is provided herein. In one embodiment, a generator protection element may calculate generator third harmonic voltage quantities using measurements from the generator terminals, and determine a stator ground fault condition using the calculated generator third harmonic voltage quantity. A tripping subsystem may issue a trip command based upon detection of a stator ground fault condition.