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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Propagation Characteristics of Ultra High Frequency Partial Discharge Signals in Power Transformer

전력용변압기에서 UHF 부분방전 신호의 전파 특성

  • Yoon, Jin-Yul (Transmission and Distribution Laboratory, Korea Electric Power Research Institute) ;
  • Han, Ki-Son (Transmission and Distribution Laboratory, Korea Electric Power Research Institute) ;
  • Ju, Hyung-Jun (Transmission and Distribution Laboratory, Korea Electric Power Research Institute) ;
  • Goo, Sun-Geun (Transmission and Distribution Laboratory, Korea Electric Power Research Institute)
  • 윤진열 (한국전력공사 전력연구원 송배전연구소) ;
  • 한기선 (한국전력공사 전력연구원 송배전연구소) ;
  • 주형준 (한국전력공사 전력연구원 송배전연구소) ;
  • 구선근 (한국전력공사 전력연구원 송배전연구소)
  • Received : 2010.08.04
  • Accepted : 2010.09.16
  • Published : 2010.10.01
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Abstract

This paper describes the characteristics of electromagnetic wave propagation in power transformer. A transformer which is similar to 154 kV single phase on-site transformer unit was provided for the purpose of the experiment. The 12 dielectric windows on the transformer enclosure to install UHF (ultra high frequency) sensors and the full scale mock ups of winding and the core were also equipped in the transformer. Every sensors to be installed to the transformer was tested and verified whether they show same characteristics or not before the experiment. A discharge gap which was used as a PD (partial discharge) source moved to several necessary locations in the transformer to simulate dielectric defects. Propagation times of electromagnetic wave signal from PD source to sensors decided by the routes of both reflection phenomenon and diffraction phenomenon were compared each other. The experimental results showed propagation route of the PD signal makes an effect on the frequency spectrum of front part of the signal and the magnitude of the signal and propagation time of the signal when the signal is captured on the sensor.

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References

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