Portable partial discharge detection apparatus and method thereof

• US 20080157988A1
• Filed: 04/26/2007
• Published: 07/03/2008
• Est. Priority Date: 12/27/2006
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Lai, Chia-Shun
• Granted Patent: US 7,623,041 B2
• Time in Patent Office: Days
• US Class Current: 340/635
• CPC Class Codes: G01R 31/1272 of cable, line or wire insulation, e.g. using partial discharge measurements locating faults in cables G01R31/083

Abstract

A portable partial discharge detection apparatus and method thereof are provided. The portable partial discharge detection apparatus includes a detection unit, a control unit and an alarm unit. The detection unit is for detecting a signal generated by an apparatus under tested due to insulation degradation. The control unit is for diagnosing whether the signal is partially discharging and outputting a diagnosis result of partial discharge according to the number of partially discharging per unit of time. The alarm unit is for automatically notifying the diagnosis result of partial discharge.

Claims

1. A portable partial discharge detection apparatus, comprising:

a detection unit, for detecting a signal generated by an apparatus under tested due to insulation degradation;

a control unit, for diagnosing whether the signal is partially discharging, and outputting a diagnosis result of partial discharge according to the number of partially discharging per unit of time; and

an alarm unit, for automatically notifying the diagnosis result of partial discharge.

2. The portable partial discharge detection apparatus according to claim 1, wherein the detection unit comprises:

a partial discharge signal coupler, for sensing the signal and accordingly outputting a sensing signal; and

a signal processor, for outputting a digital signal to the control unit according to the sensing signal.

3. The portable partial discharge detection apparatus according to claim 2, wherein the partial discharge signal processor comprises:

a filter circuit, for filtering a noise component of the sensing signal and accordingly outputting an analog signal; and

an analog-to-digital converter, for converting the analog signal to a digital signal and outputting the digital signal to the control unit.

4. The portable partial discharge detection apparatus according to claim 2, wherein the partial discharge signal coupler is a coupling coil.

5. The portable partial discharge detection apparatus according to claim 1, further comprising a self-power generation unit for converting electromagnetic energy into an operational power for the portable partial discharge detection apparatus.

6. The portable partial discharge detection apparatus according to claim 2, wherein the self-power generation unit comprises:

an electromagnetic energy converter, for converting the electromagnetic energy into an electric power; and

a rectification circuit, for rectifying the electric power and accordingly outputting the operational power.

7. The portable partial discharge detection apparatus according to claim 6, wherein the electromagnetic energy converter is a sensing coil.

8. The portable partial discharge detection apparatus according to claim 6, wherein the rectification circuit comprises:

first to fourth diodes, positive ends of the first diode and the second diode respectively coupled to negative ends of the third diode and the fourth diode; and

a capacitor, has a first end coupled to negative ends of the first diode and the second diode and a second end coupled to positive ends of the third diode and the fourth diode.

9. The portable partial discharge detection apparatus according to claim 1, wherein the control unit is a single chip processor.

10. The portable partial discharge detection apparatus according to claim 1, wherein the control unit stores a determination program for setting a plurality of numeric regions beforehand, when the number of partially discharging in per unit of time is located in one of the numeric regions, the control unit outputs the corresponding detection result of partial discharge.

11. The portable partial discharge detection apparatus according to claim 1, wherein the control unit diagnoses whether the signal is partially discharging according to a waveform of the signal and accordingly calculates the number of partially discharging per unit of time.

12. The portable partial discharge detection apparatus according to claim 1, wherein the alarm unit is a light emitting device.

13. The portable partial discharge detection apparatus according to claim 1, wherein the alarm unit is a voice playing device.

14. The portable partial discharge detection apparatus according to claim 1, wherein the alarm unit is a monitor.

15. A method of detecting partial discharge, applied to a portable partial discharge detection apparatus, the method comprising:

(a) detecting a signal generated by an apparatus under tested due to insulation degradation;

(b) diagnosing whether the signal is partially discharging and outputting a diagnosis result of partial discharge according to the number of partially discharging per unit of time; and

(c) automatically notifying the diagnosis result of partial discharge.

16. The method according to claim 15, wherein in the step (b), when the number of partially discharging per unit of time is located in a numeric region, the corresponding diagnosis result of partial discharge is outputted.

17. The method according to claim 15, wherein the step (a) comprises:

(a1) sensing the signal and accordingly outputting a sensing signal; and

(a2) outputting a digital signal according to the sensing signal.

18. The method according to claim 17, wherein the step (a2) comprises:

(a2-1) filtering a noise component of the sensing signal and accordingly outputting an analog signal; and

(a2-2) converting the analog signal into the digital signal.

19. The method according to claim 15, further comprising:

(d) converting electromagnetic energy into an operational power for the portable partial discharge detection apparatus.

20. The method according to claim 19, wherein the step (d) comprises:

converting the electromagnetic energy into an electric power; and

rectifying the electric power and accordingly outputting the operational power.