JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A 2007 Vol.8 No.3 P.378-383

http://doi.org/10.1631/jzus.2007.A0378

Transformer real-time reliability model based on operating conditions

Author(s): HE Jian, CHENG Lin, SUN Yuan-zhang
Affiliation(s): State Key Laboratory of Power Systems, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Corresponding email(s): j-he@mails.tsinghua.edu.cn
Key Words: Operational reliability, Real-time reliability model, Transformer, Winding hottest-pot temperature (HST)

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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.

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