公开(公告)号：US20170082675A1

公开(公告)日：2017-03-23

申请号：US15269959

申请日：2016-09-19

Applicant: Schweitzer Engineering Laboratories, Inc.

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

IPC: G01R31/11 ,  H02H1/00 ,  H02H3/08 ,  H04B3/46

CPC classification number: H02H3/083 ,  G01R31/085 ,  H02H1/0007 ,  H02H1/0092 ,  H02H7/265 ,  H04B3/46

Abstract: The present disclosure relates to detection of faults in an electric power system. In one embodiment, an incremental quantities subsystem is configured to determine a forward torque, an operating torque, and a reverse torque based on the plurality of time-domain representations of electrical conditions. Each of the forward torque, the operating torque, and the reverse torque may be integrated over an interval. A fault detection subsystem may determine an occurrence of the fault based on a comparison of the operating torque to the forward torque and the reverse torque. Further, a direction of the fault may be determined based on the comparison of the forward torque, the operating torque, and the reverse torque. A fault may be declared based on the comparison and the direction. A protective action subsystem may implement a protective action based on the declaration of the fault.

公开(公告)号：US09599719B2

公开(公告)日：2017-03-21

申请号：US14053347

申请日：2013-10-14

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Shankar V. Achanta ,  David E. Whitehead ,  Francis J. Cooper

IPC: G01S19/20 ,  G01S19/21

CPC classification number: G01S19/20 ,  G01S19/21

Abstract: Disclosed herein is a system for detecting manipulation of a GNSS signal and mitigating against such manipulation. A GNSS receiver receives GNSS signals from a plurality of GNSS satellites, and calculates event times for each GNSS satellite. The GNSS receiver then compares a next event time for a particular GNSS satellite with an expected next event time for the particular GNSS satellite. If the difference between the expected next event time and the next event times exceeds a predetermined threshold, then the GNSS receiver indicates that signal integrity may be compromised.

公开(公告)号：US20160099803A1

公开(公告)日：2016-04-07

申请号：US14875453

申请日：2015-10-05

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Shankar V. Achanta ,  Srinivas Achanta ,  David E. Whitehead

IPC: H04L7/00

CPC classification number: H04J3/0638 ,  H04J3/0644 ,  H04L63/14

Abstract: The time signal verification and distribution device disclosed herein verifies and distributes a time signal to consuming devices. The device determines a time quality status of a first and second time signal, calculates a difference between a first and a second time signal, and compares the difference to a predetermined threshold. Based on the time quality status and the comparison, the time signal verification and distribution device distributes a time signal to a plurality of time signal consuming devices. Exceeding the predetermined threshold may indicate a spoofing attack or other problem with the time signals.

Abstract translation: 本文所公开的时间信号验证和分发装置验证并分配消耗装置的时间信号。 该装置确定第一和第二时间信号的时间质量状态，计算第一和第二时间信号之间的差异，并将差值与预定阈值进行比较。 基于时间质量状态和比较，时间信号验证和分发设备将时间信号分配给多个时间信号消耗设备。 超过预定阈值可以指示欺骗攻击或时间信号的其他问题。

公开(公告)号：US20150081235A1

公开(公告)日：2015-03-19

申请号：US14486921

申请日：2014-09-15

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Edmund O. Schweitzer, III ,  Mangapathirao Venkata Mynam ,  Armando Guzman-Casillas ,  Tony J. Lee ,  Veselin Skendzic ,  Bogdan Z. Kasztenny ,  David E. Whitehead

IPC: G01R31/08 ,  G01R31/11

CPC classification number: G01R31/088 ,  G01R19/2513 ,  G01R31/085 ,  G01R31/11 ,  H02H7/265

Abstract: A location of a fault in an electric power delivery system may be detected using traveling waves instigated by the fault. The time of arrival of the traveling wave may be calculated using the peak of the traveling wave. To determine the time of arrival of the peak of the traveling wave, estimates may be made of the time of arrival, and a parabola may be fit to filtered measurements before and after the estimated peak. The maximum of the parabola may be the time of arrival of the traveling wave. Dispersion of the traveling wave may also be corrected using an initial location of the fault and a known rate of dispersion of the electric power delivery system. Time stamps may be corrected using the calculated dispersion of the traveling wave.

Abstract translation: 可以使用由故障引起的行波来检测电力输送系统中的故障位置。 可以使用行波的峰值计算行波的到达时间。 为了确定行波的峰值的到达时间，可以估计到达时间，并且抛物线可以适合估计峰值之前和之后的滤波测量值。 抛物线的最大值可以是旅行波的到达时间。 也可以使用故障的初始位置和电力输送系统的已知的分散速率来校正行波的分散。 可以使用所计算的行波的色散校正时间标记。

公开(公告)号：US20140111249A1

公开(公告)日：2014-04-24

申请号：US14057803

申请日：2013-10-18

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： David E. Whitehead ,  Shankar V. Achanta ,  Henry Loehner

IPC: H03K3/01

CPC classification number: H04J3/0688 ,  G01S19/00 ,  G06F1/14 ,  H02H7/261 ,  H02H7/28 ,  H03K3/01 ,  H04J3/0644

Abstract: Systems and methods for detecting the failure of a precision time source using an independent time source are disclosed. Additionally, detecting the failure of a GNSS based precision time source based on a calculated location of a GNSS receiver is disclosed. Moreover, the system may be further configured to distribute a time derived from the precision time source as a precision time reference to time dependent devices. In the event of a failure of the precision time source, the system may be configured to distribute a time derived from a second precision time source as the precision time signal during a holdover period.

Abstract translation: 公开了使用独立时间源检测精密时间源故障的系统和方法。 另外，公开了基于GNSS接收机的计算位置来检测基于GNSS的精确时间源的故障。 此外，该系统还可以被配置为将从精度时间源导出的时间作为时间相关设备的精确时间基准分配。 在精度时间源发生故障的情况下，系统可以被配置为在保持期内将从第二精度时间源导出的时间分配为精度时间信号。

公开(公告)号：US11258249B2

公开(公告)日：2022-02-22

申请号：US17034142

申请日：2020-09-28

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Edmund O. Schweitzer, III ,  David E. Whitehead ,  Tony J. Lee ,  Krishnanjan Gubba Ravikumar

IPC: H02J13/00 ,  H02H7/22 ,  H02H3/027 ,  H02H1/00 ,  H02H3/04

Abstract: Primary protection relays and an integrator disclosed for providing primary protection and secondary applications for an electric power delivery system. The primary protection relays obtain signals from, and provide primary protection operations for the power system, and may operate independently from the integrator. An integrator receives signals and status communications from the primary protection relays to perform secondary applications for the electric power delivery system. The secondary applications may include backup protection, system protection, interconnected protection, and automation functions.

公开(公告)号：US20210364557A1

公开(公告)日：2021-11-25

申请号：US17397501

申请日：2021-08-09

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Edmund O. Schweitzer, III ,  David E. Whitehead ,  Krishnanjan Gubba Ravikumar ,  Austin Edward Wade

IPC: G01R19/25 ,  H02J13/00 ,  G05B23/02

Abstract: Systems and methods to test an electric power delivery system include a communication subsystem to transmit test signals to one or more merging units, a test subsystem to transmit a test data stream to the one or more merging units via the communication subsystem, and a processor subsystem to receive looped back data from the one or more merging unit in response to the transmitted test data stream and to determine an operating condition based on the looped back data.

公开(公告)号：US11100595B2

公开(公告)日：2021-08-24

申请号：US16589731

申请日：2019-10-01

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Edmund O. Schweitzer, III ,  David E. Whitehead ,  Gregary C. Zweigle ,  Dallas J. Jacobsen

IPC: G06Q50/06 ,  G06Q30/02 ,  G01R21/00 ,  H02J3/00 ,  G01D4/00 ,  G01R21/06

Abstract: Calculation of a value of energy passing a point of an electric power delivery system, and price associated with the value is disclosed herein. Use of energy packets according with the embodiments of this disclosure more accurately represents the amount of energy produced and consumed by equipment. Energy packets may be calculated over one or more phases, over configurable time periods. Energy packets may be used in conjunction with a monetary rate to calculate the price for billing an energy consumer or crediting an energy producer.

公开(公告)号：US11079436B2

公开(公告)日：2021-08-03

申请号：US16919891

申请日：2020-07-02

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Edmund O. Schweitzer, III ,  David E. Whitehead ,  Krishnanjan Gubba Ravikumar ,  Austin Edward Wade

IPC: G01R31/327 ,  G01R35/02

Abstract: Systems and methods testing a power protection relay include a merging unit to receive signals from an electric power delivery system. The merging unit includes a test signal input to receive test signals from a testing device, a relay output to output at least one of the test signals to a power protection relay, a distribution output to output at least another of the test signals to one or more additional merging units, and a switch subsystem to route the test signal to the relay output or the distribution output.

公开(公告)号：US11056874B2

公开(公告)日：2021-07-06

申请号：US16260473

申请日：2019-01-29

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Edmund O. Schweitzer, III ,  Bogdan Z. Kasztenny ,  David E. Whitehead

IPC: H02H3/08 ,  H02H1/00 ,  H02H7/26 ,  H02H3/20 ,  H02H3/38

Abstract: An electric power delivery system may be protected upon occurrence of a fault condition by the systems and methods disclosed herein by detecting the fault condition and signaling a protective action before the overcurrent condition reaches the protective equipment. The protective action may be an opening of a circuit breaker or engagement of a fault current limiter. The overcurrent condition may be a non-steady-state condition. The fault may be detected using traveling wave or incremental quantity techniques.