The flashover voltage of short string insulator is different from long string insulator, and big error could be occurred when using flashover voltages of short string insulators to reckon the ones of long string insulators. In order to reduce this deviation, under the conditions of different equivalent salt deposit density (ESDD), non-soluble deposit density (NSDD), and uneven deposition filthy, XWP2-160 type with two umbrella porcelain insulators are used to obtain the characteristics of artificial filthy flashover voltages of the single hang string insulators, and the creepage distance effective coefficient of the type string insulators is calculated. The experimental results of V type, inverted V type insulators are compared with single hanging type string insulator, and the correction coefficient of the abnormal type insulator string is obtained. The results show that the flashover voltages of XWP2-160 type string insulators are inversely related to ESDD and NSDD, and the creepage distance effective coefficient of the type string insulators is 0.78. The maximal contamination resistance voltage of V shaped string and inverted V shaped string are larger than single hanging string insulator, and the string type correction coefficients is1.08 for V shaped string and 1.15 for inverted V shaped string respectively.

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