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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2007, Vol. 8 Issue (3 ): 6-    DOI: 10.1631/jzus.2007.A0378
    
Transformer real-time reliability model based on operating conditions
HE Jian, CHENG Lin, SUN Yuan-zhang
State Key Laboratory of Power Systems, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
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Abstract  Operational reliability evaluation theory reflects real-time reliability level of power system. The component failure rate varies with operating conditions. The impact of real-time operating conditions such as ambient temperature and transformer MVA (megavolt-ampere) loading on transformer insulation life is studied in this paper. The formula of transformer failure rate based on the winding hottest-spot temperature (HST) is given. Thus the real-time reliability model of transformer based on operating conditions is presented. The work is illustrated using the 1979 IEEE Reliability Test System. The changes of operating conditions are simulated by using hourly load curve and temperature curve, so the curves of real-time reliability indices are obtained by using operational reliability evaluation.

Key words： Operational reliability      Real-time reliability model      Transformer      Winding hottest-pot temperature (HST)     
Received: 19 December 2006     
CLC:  TB114.3  
  O224  
  O211.6  
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HE Jian
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HE Jian, CHENG Lin, SUN Yuan-zhang. Transformer real-time reliability model based on operating conditions. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2007, 8(3 ): 6-.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2007.A0378     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2007/V8/I3 /6

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