Journal of Zhejiang University-SCIENCE A

, Volume 8, Issue 3, pp 378–383 | Cite as

Transformer real-time reliability model based on operating conditions

  • He Jian 
  • Cheng Lin 
  • Sun Yuan-zhang 
Article

Abstract

Operational reliability evaluation theory reflects real-time reliability level of power system. The component failure rate varies 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) 

CLC number

TB114.3 O224 O211.6 

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • He Jian 
    • 1
  • Cheng Lin 
    • 1
  • Sun Yuan-zhang 
    • 1
  1. 1.State Key Laboratory of Power Systems, Department of Electrical EngineeringTsinghua UniversityBeijingChina

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