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

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Characteristics of Partial Discharge Under HVDC in SF6 Gas

SF6 가스 중 직류 고전압 하에서 부분방전 특성

  • Kim, Min-Su (Division of Electrical and Electronics Engineering, Korea Maritime and Ocean University) ;
  • Kim, Sun-Jae (Division of Electrical and Electronics Engineering, Korea Maritime and Ocean University) ;
  • Jeong, Gi-Woo (Division of Electrical and Electronics Engineering, Korea Maritime and Ocean University) ;
  • Jo, Hyang-Eun (Division of Electrical and Electronics Engineering, Korea Maritime and Ocean University) ;
  • Kil, Gyung-Suk (Division of Electrical and Electronics Engineering, Korea Maritime and Ocean University)
  • 김민수 (한국해양대학교 전기전자공학과) ;
  • 김선재 (한국해양대학교 전기전자공학과) ;
  • 정기우 (한국해양대학교 전기전자공학과) ;
  • 조향은 (한국해양대학교 전기전자공학과) ;
  • 길경석 (한국해양대학교 전기전자공학과)
  • Received : 2014.03.17
  • Accepted : 2014.03.24
  • Published : 2014.04.01
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Abstract

This paper dealt with the measurement and analysis of partial discharge (PD) under high voltage direct current (HVDC) in SF6 gas. Electrode systems such as a protrusion on conductor (POC), a protrusion on enclosure (POE), a crack on epoxy plate and a free particle (FP) were fabricated to simulate the insulation defects. The analysis system was designed with a Time-Frequency (T-F) map algorithm programed based on LabVIEW. This can arrange the acquired PD pulses into frequency and time domain. A HVDC power source is composed of a transformer (220 V/50 kV), a diode (100 kV) and a capacitor (50 kV, 0.5 ${\mu}F$). The gap between the electrodes is 3 mm, and the $SF_6$ gas was set at 5 bar. PD pulses were detected by a 50 ${\Omega}$ non-inductive resistor. In the analysis, PD pulses were distributed below 0.5 MHz and 20 ns ~ 35 ns for the POC, 0.7 MHz ~ 1.7 MHz, below 0.6 MHz and 10 ns ~ 40 ns and 60 ns ~125 ns for the POE, below 0.1 MHz and 135 ns ~ 215 ns for the crack, and below 1.6 MHz and 250 ns for the FP.

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References

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