The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Safety Analysis and Safety Measures of 22900/1200V Oil Immersed Transformer at Power Supply System

전철 급전시스템의 22900/1200V 유입변압기 안전성 분석

  • Lee, Jong-Su (Dept. of Railway Electric and Signaling Engineering, Graduate School of Railway, Seoul National University of Science and Technology) ;
  • Lee, Jongwoo (Dept. of Railway Electric and Signaling Engineering, Graduate School of Railway, Seoul National University of Science and Technology)
  • Received : 2013.06.04
  • Accepted : 2013.08.05
  • Published : 2013.09.01
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Abstract

Subway is electrified railway system nowadays, in which liquid dielectric transformers have been widely used, though mold type transformers are replacing it. The transformers supplies large electric power and have innate hazards causing accidents under operation. A number of researcher have carried out on failures of it and have oriented to identify transformer's failure causes and how to maintain it healthy state. The transformer failures can cause serious accidents which can provoke economic loss and leads persons to kill. In this paper, we carried out a safety activity to reveal hazards and to estimate risk of subway liquid dielectric transformers using FMEA, HAZOP and What-if methods. In case of installing safety devices in oil immersed transformer, we tried to evaluate an effect on a subsystem's failure rate. We proposed how to design subsystem failure rate and safety device failure rates.

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References

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