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Detection Technique of Partial Discharge by a Capacitive Probe in Cast-resin Transformers

몰드변압기에서 용량성 프로브에 의한 부분방전 검출 기술

  • Jung, Kwang-Seok (Division of Electrical and Electronics Engineering, Korea Maritime University) ;
  • Park, Dae-Won (Division of Electrical and Electronics Engineering, Korea Maritime University) ;
  • Cha, Hyeon-Kyu (Division of Electrical and Electronics Engineering, Korea Maritime University) ;
  • Cha, Sang-Wook (Division of Electrical and Electronics Engineering, Korea Maritime University) ;
  • Kil, Gyung-Suk (Division of Electrical and Electronics Engineering, Korea Maritime University)
  • 정광석 (한국해양대학교 전기전자공학부) ;
  • 박대원 (한국해양대학교 전기전자공학부) ;
  • 차현규 (한국해양대학교 전기전자공학부) ;
  • 차상욱 (한국해양대학교 전기전자공학부) ;
  • 길경석 (한국해양대학교 전기전자공학부)
  • Received : 2011.01.24
  • Accepted : 2011.03.28
  • Published : 2011.04.01

Abstract

This paper dealt with a partial discharge (PD) detection method for insulation diagnosis in cast-resin transformers. To detect PD pulse, a planar-capacitive probe was designed and fabricated. The probe has no insulation problem and can be installed on cast-resin transformers even in operation since it does not connect with high voltage conductor. The PD measurement system consists of the capacitive probe, a coupling network of 100 [kHz] low-cutoff frequency, and an amplifier with a gain of 40 [dB] and a frequency bandwidth of 500 [Hz]~45 [MHz]. A plane-needle and a plane-plane electrode system were fabricated to simulate insulation defects in a cast-resin transformer. Sensitivity of the PD measurement system, which is evaluated by a standard calibrator was 0.35 [mV/pC] for positive and 0.45 [mV/pC] for negative, respectively. The PD detection by the capacitive probe was less sensitive than that by a coupling capacitor according to IEC 60270, but we could analyze the magnitude and the phase distribution of PD pulse.

Acknowledgement

Supported by : 한국연구재단

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