Journal of Guangdong University of Technology ›› 2012, Vol. 29 ›› Issue (2): 58-62.doi: 10.3969/j.issn.1007-7162.2012.02.011

• Comprehensive Studies • Previous Articles     Next Articles

A Study of Electric Fields Around Composite Insulators under -Polluted and Wet Conditions

  

  1. 1. Maintenance Branch Company of Chongqing Electric Power Corporation, Chongqing 401554, China;
     2. Chongqing Electric Power Design Institute, Chongqing 401121, China;
    3. State Key Laboratory of Power Transmission Equipment & System Security and New Technology,Chongqing University, Chongqing 400030,China
  • Online:2012-06-25 Published:2012-06-25

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Abstract: Electric-field characteristics of composite insulators under polluted and wet conditions can effectively reduce the risk of composite insulator flashover. The surface thickness and uniformity of composite insulators were researched, and the simulation model for two-dimensional electric fields of 110 kV composite insulators was established via the software Comsol Multiphysics. The finite element method was applied to calculate the potential and field distribution for 110  kV under polluted and wet conditions. The research shows that the effect of uniform water is related with pollution layer conductivity, and that the umbrella group of the composite insulator near the high voltage supports higher voltage if pollution layer conductivity increases to 10-7S. When there are drops dripping on the surface of the composite insulator, the electric field intensity surrounding the drops grows rapidly.

Key words: polluted and wet conditions; composite insulator; pollution layer conductivity; electric field; potential distribution

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