Testing system for traveling wave fault detectors

Patent metadata

Field	Value
Publication number	US-11320475-B2
Application number	US-202016792814-A
Country	US
Kind code	B2
Filing date	Feb 17, 2020
Priority date	Oct 13, 2015
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

A testing apparatus for imposing a traveling wave signal on an electric system signal for testing a fault detector is disclosed herein. The fault detector may be configured to simulate a fault at a particular location by controlling the timing of the traveling wave signal. The testing apparatus may be configured to impose multiple traveling wave signals to test the accuracy of the fault location determined by the fault detector. The testing apparatus may be configured to determine the calculation accuracy of the fault detector. The testing apparatus may impose a traveling wave signal on a signal simulating an electrical signal on an electric power delivery system. The testing apparatus may be used to test capabilities of a fault detector of detecting a fault using traveling waves or incremental quantities.

First claim

What is claimed is:

1. A traveling wave test system for testing a high-speed electrical power system fault detector, comprising:
a stimulus generator configured to generate a representation of an electric power system signal;
the traveling wave test system configured to generate a plurality of traveling wave signals of a simulated fault to be imposed on the representation of the electric power system signal from the stimulus generator, the traveling wave test system comprising:
an input configured to receive a control signal to control times at which the plurality of traveling wave signals are to be imposed on the representation of the electric power system signal;
an output controller configured to control the imposition of the traveling wave signals onto the representation of the electric power system signal based on the control signal received at the input; and,
a coupler configured to impose the plurality of traveling wave signals onto the representation of the electric power system signal.

2. The traveling wave test system of claim 1 , wherein the traveling wave test system is further configured to impose a delay between each of the plurality of traveling wave signals.

3. The traveling wave test system of claim 2 , wherein the delay between each of the plurality of traveling wave signals is determined based on a simulated fault location.

4. The traveling wave test system of claim 1 , further comprising a user interface module in communication with the input, the user interface module configured to receive instructions from a user regarding the times at which the plurality of traveling wave signals are imposed onto the representation of the electric power system signal.

5. The traveling wave test system of claim 1 , wherein the plurality of traveling wave signals comprise at least one simulation of a reflection of an initial wave front of a simulated fault.

6. The traveling wave test system of claim 1 , further comprising:
a voltage output configured to provide a first subset of the plurality of traveling wave signals to a voltage input of the fault detector; and
a current output configured to provide a second subset of the plurality of traveling wave signals to a current input of the fault detector.

7. A system to test at least one high-speed electrical power system fault detector, the system comprising:
a stimulus generator configured to generate a representation of an electric power system signal;
a traveling wave test system configured to generate a traveling wave signal to be imposed on the representation of the electric power system signal; and
an output controller in communication with the stimulus generator and the traveling wave test system and configured to cause the stimulus generator to provide the representation of the electric power system signal and the traveling wave signal to the at least one fault detector.

8. The system of claim 7 , wherein the traveling wave signal comprises an initial wave front, and the traveling wave test system is further configured to generate a representation of a reflection of the traveling wave after a delay.

9. The system of claim 8 , wherein the delay is determined based on a simulated fault location.

10. The system of claim 7 , wherein the traveling wave test system further comprises an injection capacitor configured to be selectively discharged to create the traveling wave signal.

11. The system of claim 10 , wherein the traveling wave test system further comprises an electrical source configured to charge a reservoir capacitor, and wherein the reservoir capacitor is configured to selectively charge the injection capacitor through a charge resistor.

12. The system of claim 7 , wherein the representation of the electric power system signal comprises a sinusoidal signal.

13. The system of claim 7 , wherein the traveling wave test system further comprises an amplifier configured to create the traveling wave signal.

14. The system of claim 7 , wherein the output controller further comprises an input configured to receive a signal to control a time at which the traveling wave signal is imposed on the representation of an electric power system signal.

15. The system of claim 14 , wherein the input comprises a transistor-transistor logic input.

16. The system of claim 14 , wherein the input comprises a time input.

17. The system of claim 14 , wherein the input is configured to connect to the at least one high-speed electrical power system fault detector.

18. The system of claim 7 , wherein the apparatus is configured to provide a plurality of traveling wave signals to a first high-speed electric fault detector and a second high-speed electric fault detector.

19. The system of claim 18 , wherein the traveling wave test system is further configured to generate the plurality of traveling wave signals, each of the plurality of traveling wave signals separated by a delay, and the traveling wave test system is further configured to determine the delay between each of the plurality of traveling wave signals based on a simulated fault location.

20. The system of claim 7 , further comprising a user interface module in communication with the output controller, the user interface module configured to receive instructions from a user to impose the traveling wave signal on the representation of the electric power system signal.

Assignees

• Schweitzer Engineering Lab Inc

Inventors

• Whitehead David E
• Lee Tony J
• Sheffield Zachary King
• Windley Tracey G

Classifications

• G01R31/086 Primary

  in power transmission or distribution networks, i.e. with interconnected conductors · CPC title

• G01R31/11

  using pulse reflection methods · CPC title

• G01R35/00

  Testing or calibrating of apparatus covered by the other groups of this subclass · CPC title

• G01R31/3272

  Apparatus, systems or circuits therefor (G01R31/3275 takes precedence) · CPC title

• H02H7/265

  making use of travelling wave theory · CPC title