Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Fault Prediction Based on Unbalanced Current Detection of Three Phase Heater and Selection of the Protective Device

3상 히터의 불평형전류 검출에 의한 결함예측 및 보호장치의 선정

  • Lee, Mun Hyung (Department of Safety Engineering, Seoul National University of Science and Technology) ;
  • Jung, Jae Hee (Department of Safety Engineering, Seoul National University of Science and Technology)
  • 이문형 (서울과학기술대학교 안전공학과) ;
  • 정재희 (서울과학기술대학교 안전공학과)
  • Received : 2014.11.13
  • Accepted : 2015.01.02
  • Published : 2015.02.28
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Abstract

Three phase heaters in 7 buildings of 2 sites were examined for precise diagnosis. The sample size was 626. Precise examinations of current and the heater wiring status revealed contact failures and arcs in equipments that had CUF larger than 10%. Contact failures and arcs may cause electrical fire. Therefore, the correlation between the CUF and the imperfections in heater equipment and its wiring was analyzed for three phase heaters. In addition, the protection devices used for detection of heater imperfections were found to be unsuitable for the purpose. Current status of the protection devices was analyzed, and suggestions for improvements were made for new standards of the protection device selection.

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References

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