公开(公告)号：US10649020B2

公开(公告)日：2020-05-12

申请号：US15590164

申请日：2017-05-09

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Shankar V. Achanta

IPC: G01R31/08 ,  H02H3/08 ,  H02H3/52 ,  H02H7/26 ,  H02H3/033

Abstract: A conductor-mounted device (CMD) used to signal an intelligent electronic device (IED) of the existence of a fault on a portion of the electric power delivery system is described herein. The CMD may provide a heartbeat signal to the IED. The CMD may provide a fault signal to the IED. The CMD may be powered via a parasitic current draw on the conductor to which it is mounted. An IED may use a fault signal and/or LOC signal from a CMD to coordinate a high-impedance fault detection and/or downed line events.

公开(公告)号：US20200072904A1

公开(公告)日：2020-03-05

申请号：US16549853

申请日：2019-08-23

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Edmund O. Schweitzer, III ,  Armando Guzman-Casillas ,  Veselin Skendzic ,  Mangapathirao Venkata Mynam ,  Bogdan Z. Kasztenny

IPC: G01R31/327 ,  G01R31/02 ,  G01R21/133 ,  G01R31/08

Abstract: The present disclosure relates to determining locations of low-energy events on power lines. For example, an IED may receiving an input signal indicating a local electrical condition of a power line. The IED may detect traveling waves on the power line based on the local electrical condition. The IED may detect traveling waves on the power line based on the local and remote electrical conditions. The IED may determine that the traveling waves are associated with a low-energy event. The IED may determine the location of the low-energy event on the power line based at least in part on the traveling waves.

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：US20200064392A1

公开(公告)日：2020-02-27

申请号：US16110225

申请日：2018-08-23

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Kanchanrao Gangadhar Dase

IPC: G01R31/08

Abstract: The present disclosure relates to a computationally efficient technique for determining a location of a fault on a power line. The technique includes determining an approximate location of the fault based at least in part on a local current measurement and a local voltage measurement from a local relay and a remote current measurement and a remote voltage measurement from a remote relay. The technique includes determining a corrected location of the fault based on the approximate fault location and a correction factor, wherein the correction factor is based on a propagation constant of the power line.

公开(公告)号：US10564247B2

公开(公告)日：2020-02-18

申请号：US15926818

申请日：2018-03-20

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Armando Guzman-Casillas ,  Mangapathirao Venkata Mynam ,  Taylor Joseph Blanc ,  David E. Whitehead ,  Tony J. Lee ,  Zachary King Sheffield ,  Tracey G. Windley

IPC: G01R35/00 ,  G01R31/28 ,  G01R31/327 ,  G01R31/11 ,  G01R31/08

Abstract: A testing system for imposing a traveling wave signal on an electric power system signal for testing a fault detector is disclosed herein. The testing system may be configured to simulate a fault at a simulated location by controlling the timing of the traveling wave signal. The testing system may be configured to impose multiple traveling wave signals to test the accuracy of the fault location determined by the fault detector. The testing system may be configured with multiple testing apparatuses using time coordination and referenced to an intended fault instant. The testing system may be configured to supply traveling waves of different polarities to test for different fault type detection.

公开(公告)号：US10551415B2

公开(公告)日：2020-02-04

申请号：US16385833

申请日：2019-04-16

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Eric Ryan ,  Mark A. Thomas ,  Mark F. Witczak

IPC: G01R19/165 ,  G01R15/18 ,  G01R1/22 ,  H02H3/04

Abstract: The present disclosure relates to systems and methods of locking a faulted circuit indicator (FCI). For example, the FCI may include a locking assembly. The locking assembly may include a lock plate that selectively moves between a locked position and an unlocked position. When in the locked position, the lock plate blocks a lock link of the FCI from moving in a first direction to prevent the FCI from opening. When in an unlocked position, the lock plate enables the lock link of the FCI to move in the first direction to allow the FCI to open.

公开(公告)号：US20200028494A1

公开(公告)日：2020-01-23

申请号：US16587337

申请日：2019-09-30

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Srinivas Achanta

IPC: H03H17/02

Abstract: A fixed latency configurable tap or fixed-tap digital filter may filter a signal in a fixed amount of time, regardless of the number of taps. The filter may include one or more of a clock, a plurality of registers in a shift register, an adder, an accumulator, and/or a scaler. In at least one embodiment, a running average may be maintained as samples are received such that the latency remains fixed with a constant number of clock cycles.

公开(公告)号：US10474142B2

公开(公告)日：2019-11-12

申请号：US15718145

申请日：2017-09-28

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Dennis Haes ,  Normann Fischer

IPC: H02H7/00 ,  G05B23/02 ,  H02H1/00 ,  G01R19/25 ,  G01R31/02

Abstract: Disclosed herein are a variety of systems and methods related to detection of a cross-country fault in an electrical power system. In one embodiment, a system consistent with the present disclosure may be configured to monitor electrical parameters in the electrical power system. The system may determine when a voltage magnitude of one phase exceeds a first voltage threshold. The one phase that exceeds the first voltage threshold may be identified as an un-faulted phase. The system may further be configured to determine that the voltage magnitude of the un-faulted phase exceeds a second threshold based on a zero-sequence voltage. The system may further be configured to determine that a phase angle between the un-faulted phase and the zero-sequence voltage is within a range. A protective action to clear the cross-country fault condition may be implemented upon identification of a cross-country fault.

公开(公告)号：US20190324074A1

公开(公告)日：2019-10-24

申请号：US15959053

申请日：2018-04-20

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： John Thompson ,  Mangapathirao Venkata Mynam

IPC: G01R31/08 ,  H02H7/26

Abstract: The present disclosure pertains to detection of a broken conductor in an electric power system. In one embodiment, a broken conductor detector may be configured to be mounted to an electrical conductor and may comprise a communication subsystem configured to transmit a signal configured to indicate that the conductor is broken. A sensor may determine an operating vector. A processing subsystem may be configured to receive the operating vector from the sensor and to identify when the operating vector is outside of a range defined by a rest vector and a threshold value. In certain embodiments, the threshold may comprise a three-dimensional sphere. The processing subsystem may determine that the conductor is broken based on the operating vector remaining outside of the range for a period of time determined by the timer subsystem. A signal may be transmitted by the communication subsystem to indicate that the conductor is broken.

公开(公告)号：US20190317143A1

公开(公告)日：2019-10-17

申请号：US16371910

申请日：2019-04-01

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Kanchanrao Gangadhar Dase ,  Sajal Kumar Harmukh ,  Arunabha Chatterjee

IPC: G01R31/08 ,  G01R19/165

Abstract: The present disclosure relates to detecting a broken conductor in a power transmission line. In an embodiment, a processor receives a signal indicating current on the transmission line. The processor determines that a broken conductor is present on the transmission line based at least in part on a magnitude of the current being less than a line charging current of the transmission line and a phase angle of the current leading a respective phase voltage of the transmission line. The processor effects a control operation based on the determined broken conductor.