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

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.

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.

A device for diagnosing partial discharge, comprising:

• a noise removing device configured to remove noise included in a partial discharge signal based on a strength difference between output signals obtained by performing distributed signal processing on the partial discharge signal at reaction rates different from each other;
• a laser module configured to output a laser beam to a surface of a power device, and receive a signal reflected from the surface of the power device;
• a correlation analyzing unit configured to compare the partial discharge signal in which the noise is removed with the reflected signal, and analyze a correlation of the signals;
• and
• a partial discharge diagnostic unit configured to perform partial discharge diagnosis based on a result of correlation analysis of the correlation analyzing unit.

A method of diagnosing partial discharge, comprising:

• performing, by a noise removing device, distributed signal processing on a detected partial discharge signal at reaction rates different from each other, and removing noise included in the partial discharge signal based on a strength difference between output signals obtained by performing distributed signal processing on the partial discharge signal;
• outputting, by a laser module, a laser beam to a surface of a power device when partial discharge is generated, and extracting a sound wave and vibration data based on a signal reflected from the surface of the power device;
• comparing, by a correlation analyzing unit, the partial discharge signal in which the noise is removed with the sound wave and vibration data extracted through the laser module, and analyzing a correlation of the signals;
• and
• performing, by a partial discharge diagnosis unit, partial discharge diagnosis when the partial discharge signal in which the noise is removed matches with the sound wave and vibration data with respect to at least one of a generation cycle, a time, and a phase based on a result of correlation analysis.