TESTING METHOD ON DC ARTIFICIALLY ICED DISK-SHAPED AND SUSPENSION INSULATORS

摘要

Adopting mathematical statistical methods, by comparing the differences and equivalent relationship of test result under 3 kinds of test methods, this paper has bring forward the DC icing test methods of disk-shaped suspension insulator. Results have been shown that: Firstly, iced flashover voltages obtained by different test methods at the same salt concentration (SDD) or ice water conductivity (γ20) differ from each other significantly, among which, voltage obtained by equably boosting voltage method is the highest , the U50% obtained by constant voltage under up-down manner follows by, and the minimum flashover voltage obtained by "U"-shaped curve is the lowest; Secondly, there is equivalent relationship between the average flashover voltage Uave obtained by t equably boosting voltage method and the U50% obtained by constant voltage under up-down manner, and the same relationship between the minimum flashover Ufrnin voltage obtained by "U"shaped curve and the U50% obtained by the constant voltage under up-down manner is also found.