Device for removing partial discharge noise and method of diagnosing the same

Patent metadata

Field	Value
Publication number	US-9838228-B2
Application number	US-201214347968-A
Country	US
Kind code	B2
Filing date	Sep 28, 2012
Priority date	Sep 28, 2011
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

There are provided a device for removing partial discharge noise and a method of diagnosing the same. The device includes a noise removing device configured to remove noise of a partial discharge signal using a reaction rate difference of signals when the partial discharge signal is generated, and output a signal in which noise is removed, a laser module configured to output a laser beam to a surface of a power device when the partial discharge signal is generated and extract sound wave and vibration data from a reflection signal of the laser beam, a correlation analyzing unit configured to compare the partial discharge signal in which noise is removed input through a sensor connecting unit and the sound wave and vibration data extracted through the laser module, and analyze a correlation, and a partial discharge diagnostic unit configured to perform partial discharge diagnosis on a signal that matches the partial discharge signal in which noise is removed with at least one of a generation cycle, a time, and a phase of the sound wave and vibration data based on a result of correlation analysis of the correlation analyzing unit.

First claim

The invention claimed is:

1. A device for removing partial discharge noise, comprising:
a distributor configured to distribute a partial discharge signal detected through a partial discharge sensor into at least two signals when partial discharge is generated in a power device;
a distributed signal processor configured to perform distributed signal processing on each of the partial discharge signals distributed by the distributor at reaction rates different from each other; and
a differential signal processor configured to receive output signals obtained by performing distributed signal processing at reaction rates different from each other from the distributed signal processor, and remove noise included in the partial discharge signal based on a strength difference of the output signals.

2. The device of claim 1 , wherein the distributed signal processor comprises:
a high-speed circuit unit configured to perform high-speed signal processing on one signal among the distributed partial discharge signals using a high-speed logarithmic amplifier; and
a low-speed circuit unit configured to perform low-speed signal processing on another signal among the distributed partial discharge signals using a low-speed logarithmic amplifier,
wherein the high-speed logarithmic amplifier has a faster reaction rate than the low-speed logarithmic amplifier.

3. The device of claim 2 , wherein the differential signal processor removes the noise included in the partial discharge signal by subtracting a peak value of a signal strength with respect to the output signal of the low-speed circuit unit from a peak value of a signal strength with respect to the output signal of the high-speed circuit unit.

4. The device of claim 2 , wherein the distributed signal processor further comprises:
a medium-speed circuit unit configured to perform medium-speed signal processing on another signal among the distributed partial discharge signals using a medium-speed logarithmic amplifier,
wherein the medium-speed logarithmic amplifier has a slower reaction rate than the high-speed logarithmic amplifier, and a faster reaction rate than the low-speed logarithmic amplifier.

5. The device of claim 4 , wherein, when a signal similar to the partial discharge signal is repeated at the same time zone, the differential signal processor removes the noise of the partial discharge signal based on a signal strength difference between the output signals of the high-speed logarithmic amplifier and the medium-speed logarithmic amplifier.

6. A method of removing partial discharge noise, comprising:
when partial discharge is generated in a power device, distributing, by a distributor, a partial discharge signal detected through a partial discharge sensor into at least two signals;
performing, by a distributed signal processor, distributed signal processing on each of the distributed partial discharge signals distributed by the distributor at reaction rates different from each other; and
receiving, by a differential signal processor, output signals obtained by performing distributed signal processing at reaction rates different from each other from the distributed signal processor, and removing noise included in the partial discharge signal based on a strength difference of the output signals.

7. The method of claim 6 , wherein, in the performing of the distributed signal processing, the distributed signal processor:
performs high-speed signal processing on one signal among the distributed partial discharge signals using a high-speed logarithmic amplifier; and
performs low-speed signal processing on another signal among the distributed partial discharge signals using a low-speed logarithmic amplifier,
wherein the high-speed logarithmic amplifier has a faster reaction rate than the low-speed logarithmic amplifier.

8. The method of claim 7 , wherein the removing of the noise comprises:
subtracting, by the differential signal processor, a peak value of a signal strength with respect to the output signal of the low-speed logarithmic amplifier from a peak value of a signal strength with respect to the output signal of the high-speed logarithmic amplifier, and removing the noise included in the partial discharge signal.

9. The method of claim 7 ,
wherein, in the performing of the distributed signal processing, the distributed signal processor performs medium-speed signal processing on another signal among the distributed partial discharge signals using a medium-speed logarithmic amplifier, the medium-speed logarithmic amplifier having a slower reaction rate than the high-speed logarithmic amplifier and a faster reaction rate than the low-speed logarithmic amplifier, and
wherein, when a signal similar to the partial discharge signal is repeated at the same time zone, the removing of the noise comprises removing the noise of the partial discharge signal based on a strength difference between the output signals of the high-speed logarithmic amplifier and the medium-speed logarithmic amplifier.

Assignees

• Korea Electric Power Corp

Inventors

• Choi Kwang Sik
• Seo Jung Cheol

Classifications

• G01N29/50

  using auto-correlation techniques or cross-correlation techniques · CPC title

• G01N29/4463

  Signal correction, e.g. distance amplitude correction [DAC], distance gain size [DGS], noise filtering · CPC title

• H04L25/08 Primary

  Modifications for reducing interference; Modifications for reducing effects due to line faults {; Receiver end arrangements for detecting or overcoming line faults} · CPC title

• G01N29/32

  Arrangements for suppressing undesired influences, e.g. temperature or pressure variations {, compensating for signal noise} · CPC title

• G01N29/2418

  using optoacoustic interaction with the material, e.g. laser radiation, photoacoustics (photoacoustic cells G01N21/1702; measuring characteristics of vibrations by using radiation-sensitive means G01H9/00; acousto-optical conversion techniques for short-range imaging G01S15/8965; sound-producing devices using laser bundle G10K15/046) · CPC title