한국전기전자재료학회논문지 (Journal of the Korean Institute of Electrical and Electronic Material Engineers)

  • 제25권2호
  • /
  • Pages.147-152
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  • 2012
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  • 1226-7945(pISSN)
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  • 2288-3258(eISSN)
한국전기전자재료학회 (The Korean Institute of Electrical and Electronic Material Engineers)
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코로나와 직렬아크 방전에 의해 발생한 음향신호의 분석

Analysis of Acoustic Signals Produced by Corona and Series-arc Discharges

  • 조향은 (한국해양대학교 전기전자공학부) ;
  • 진창환 (한국해양대학교 전기전자공학부) ;
  • 박대원 (한국해양대학교 전기전자공학부) ;
  • 길경석 (한국해양대학교 전기전자공학부) ;
  • 안창환 (인하공업전문대학 디지털전자정보과)
  • Jo, Hyang-Eun (Division of Electrical and Electronics Engineering, Korea Maritime University) ;
  • Jin, Chang-Hwan (Division of Electrical and Electronics Engineering, Korea Maritime University) ;
  • Park, Dae-Won (Division of Electrical and Electronics Engineering, Korea Maritime University) ;
  • Kil, Gyung-Suk (Division of Electrical and Electronics Engineering, Korea Maritime University) ;
  • Ahn, Chang-Hwan (Department of Digital Electronics & Information, Inha Technical College)
  • 투고 : 2012.01.09
  • 심사 : 2012.01.24
  • 발행 : 2012.02.01
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초록

This paper dealt with the frequency component analysis of acoustic signals produced by corona and series-arc discharges as a diagnostic technique for closed-switchboards. Corona and series-arc discharge were simulated by a needle-plane electrode and an arc generator specified in UL1699, respectively. Acoustic signal was detected by a wideband acoustic sensor with a frequency bandwidth of 4 Hz~100 kHz (-3 dB). We analyzed frequency spectrums of the acoustic signals detected in various discharge conditions. The results showed that acoustic signals mainly exist in ranges from 30 kHz to 60 kHz. From the experimental results, an acoustic detection system which consists of a constant current power supply (CCP), a low noise amplifier (LNA) and a band pass filter was designed and fabricated. The CCP separates the signal component from the DC source of acoustic sensor, and the LNA has a gain of 40 dB in ranges of 280 Hz~320 kHz. The high and the low cut-off frequency are 30 kHz and 60 kHz, respectively. We could detect corona and series-arc discharges without any interference by the acoustic detection system, and the best frequency is considered in ranges of 30 kHz~60 kHz.

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참고문헌

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