Proceedings of the KSR Conference (한국철도학회:학술대회논문집)

The Korean Society for Railway (한국철도학회)
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Analysis of PD Patterns Depending on Defect Types in Insulation System

절연계의 결함별 부분방전 패턴분석

  • 박찬용 (한국해양대학교 전기전자공학부) ;
  • 김황국 (한국해양대학교 전기전자공학부) ;
  • 김성욱 (한국해양대학교 전기전자공학부) ;
  • 지홍근 (한국해양대학교 전기전자공학부) ;
  • 길경석 (한국해양대학교 전기전자공학부)
  • Published : 2009.05.21
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Abstract

In this paper, we carried out a comparative analysis of partial discharge(PD) patterns caused by deterioration of cast-resin and oil insulation systems. Various electrode systems were fabricated such as needle-needle, needle-plane and plane-plane to simulate defects that may exist in the insulation system of transformers. A low-noise amplifier which has a gain of 40 dB and a frequency bandwidth of 500 kHz $\sim$ 30 MHz (-3 dB) was designed to detect small PD signals. From the analysis of acquired PD signals, we could find that a unique PD pattern is formed according to types of defect. These data will be applied usefully to diagnose insulation condition of transformers.

Keywords