Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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Characteristic as a Resonance Frequency of $SF_6$ Gas

SF6 가스중의 공진주파수에 따른 신호특성

  • 이용희 (LG산전 전력연구소 전력기기연구팀) ;
  • 이현동 (LG산전 전력연구소 전력기기연구팀) ;
  • 박정남 (LG산전 전력연구소 전력기기연구팀) ;
  • 신양섭 (LG산전 전력연구소 전력기기연구팀) ;
  • 박장수 (LG산전 전력연구소 보호제어연구팀) ;
  • 서정민 (LG산전 전력연구소 전력기기연구팀)
  • Published : 2003.07.21
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Abstract

In this paper, chamber(Circuit breaker compartment of C-GIS) made of stainless steel with 4 mm width is used. Artificial defect was made on enclosure or HV conductor of chamber and $SF_6$ gas was injected into it according to pressure. In this experiment, Acoustic emission sensors of different types was used to compare sensitivity to detect acoustic signal occurred by Partial discharge(PD) of according to types and resonance frequency in $SF_6$ gas atmosphere. Sensors used in tests was R6I, R15I and 2/4/6 Pre-Amplifier connected with R6IU without pre. amp. In case of R6IU, gain was adjusted with 40 dB like other sensors and operated by differential mode. Post amplifier(post. amp) and band pass filter(BPF) were developed Gain of post. amp. is 60 dB and BPF has band width of $50{\sim}300$ kHz. Also, envelope circuit developed reduces frequency of AE sensor. As a result, in $SF_6$ atmosphere, R6IU and R6I had resonance frequency of 60 Hz was better than R15I. Also, R6IU was better than R6I because of type property of pre.amp. had differential mode.

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