Partial discharge transducer

Patent metadata

Field	Value
Publication number	US-11802901-B2
Application number	US-202117538441-A
Country	US
Kind code	B2
Filing date	Nov 30, 2021
Priority date	Dec 28, 2018
Publication date	Oct 31, 2023
Grant date	Oct 31, 2023

Abstract

A partial discharge (PD) transducer that includes a PD sensor configured to sense a PD event of an electrical system. At least one light emitting device (LED) is arranged in series with the PD sensor. The LED is configured to receive the electrical sensor signal from the PD sensor and to generate a light signal in response to the electrical sensor signal.

First claim

The invention claimed is:

1. A partial discharge transducer system, comprising:
a partial discharge (PD) sensor configured to sense a partial discharge event of a high voltage AC component of an electrical system;
at least one light emitting device (LED) in series with the PD sensor, the LED configured to:
receive an electrical sensor signal from the PD sensor; and
generate a light signal in response to the electrical sensor signal; and

circuitry coupled to the PD sensor and the LED, the circuitry configured to continuously bias the LED above a turn-on voltage of the LED without use of an active electrical device.

2. The system of claim 1 , wherein the circuitry comprises a high-pass filter configured to couple in AC power at a base frequency of the high voltage AC component.

3. The system of claim 2 , wherein the base frequency is a 60 Hz base frequency.

4. The system of claim 1 , wherein the system is configured to detect partial discharge events that generate a PD sensor voltage smaller than the LED's turn-on voltage.

5. The system of claim 1 , comprising an optical fiber arrangement configured to communicate the light signal from the LED to processing circuitry remote from the high voltage AC component.

6. The system of claim 5 , wherein the processing circuitry is configured to convert the light signals to electrical signals and to extract information about the partial discharge event.

7. The system of claim 1 , comprising a PD detection processor configured to monitor for changes of one or both of usage and loading of the electrical system over time based on characteristics of sensed partial discharge events.

8. The system of claim 7 , wherein the PD detection processor is configured to predict a time of failure of the electrical system based on the monitored changes of one or both of the usage and the loading of the electrical system over time.

9. The system of claim 1 , wherein the LED comprises a light emitting diode.

10. The system of claim 1 , wherein the LED comprises a laser device.

11. A partial discharge transducer system, comprising:
a plurality of partial discharge (PD) sensors each configured to sense a partial discharge event of a high voltage component of an electrical system at a different location relative to the high voltage component;
a plurality of light emitting devices (LEDs) each in series with one of the PD sensors, each of the LEDs configured to:
receive an electrical sensor signal from one of the PD sensors; and
generate a light signal in response to the electrical sensor signal indicative of the partial discharge event based on a location of the partial discharge event; and

circuitry coupled to each PD sensor and LED, the circuitry configured to continuously bias the LEDs above a turn-on voltage of the LEDs without use of an active electrical device.

12. The system of claim 11 , wherein the circuitry comprises a high-pass filter configured to couple in AC power at a base frequency of the high voltage AC component.

13. The system of claim 12 , wherein the base frequency is a 60 Hz base frequency.

14. The system of claim 11 , wherein the system is configured to detect partial discharge events that generate PD sensor voltages smaller than the turn-on voltage of the LEDs.

15. The system of claim 11 , comprising an optical fiber arrangement configured to communicate the light signals from the LEDs to processing circuitry remote from the high voltage AC component.

16. The system of claim 15 , wherein the processing circuitry is configured to convert the light signals to electrical signals and to extract information about the partial discharge event.

17. The system of claim 11 , comprising a PD detection processor configured to monitor for changes of one or both of usage and loading of the electrical system over time based on characteristics of sensed partial discharge events.

18. The system of claim 17 , wherein the PD detection processor is configured to predict a time of failure of the electrical system based on the monitored changes of one or both of the usage and the loading of the electrical system over time.

19. The system of claim 11 , wherein each of the LEDs comprises a light emitting diode.

20. The system of claim 11 , wherein each of the LEDs comprises a laser device.

Assignees

• Palo Alto Res Ct Inc
• Xerox Corp

Inventors

• Karin Todd
• Kiesel Peter
• Raghavan Ajay

Classifications

• G01R31/1218 Primary

  using optical methods; using charged particle, e.g. electron, beams or X-rays · CPC title

• G01R15/16

  using capacitive devices · CPC title

• G01R15/22

  using light-emitting devices, e.g. LED, optocouplers {(G01R31/31901 takes precedence)} · CPC title

• G01R19/0084

  Measuring voltage only · CPC title

• G01R31/1272

  of cable, line or wire insulation, e.g. using partial discharge measurements (locating faults in cables G01R31/083) · CPC title