Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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Analysis on the Mass Loss in Self-blast type $SF_6$ Gas Circuit Breaker

Self-blast형 $SF_6$ 가스 차단기의 노즐용삭 분석

  • Jeong, Young-Woo (LS Industrial Systems, Electrotechnology R&D Center) ;
  • Bae, C.Y. (LS Industrial Systems, Electrotechnology R&D Center) ;
  • Ahn, H.S. (LS Industrial Systems, Electrotechnology R&D Center) ;
  • Choi, J.W. (LS Industrial Systems, Electrotechnology R&D Center) ;
  • Oh, I.S. (LS Industrial Systems, Electrotechnology R&D Center)
  • Published : 2006.07.12
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Abstract

In our study, the PTFE nozzle ablation in the high-voltage self-blast type $SF_6$ gas circuit breaker was investigated. The test circuit breaker has the structure that the pin electrode is moving and the pressure reservoir volume and the dimension is almost same as commercial 145kv 40kA circuit breaker for similar result in real circuit breaker. The variation of current and arcing time was the range of $36kA_{rms}$(symmetry) - $40kA_{rms}$(asymmetry) and 10-16 ms. From the measured data the tendecy of the mass loss of the nozzle to current load and arc energy was estimated. In this process, the distance from the arc to nozzle(PTFE) surface, area which was exposed to arc and stroke contour was considered. These results will be used to enhance the accuracy of the computational fluid dynamics analysis in circuit breaker and estimate the residual life time of a circuit breaker.

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