摘要：

It is very important for the related design, operation and maintenance of insulators to measure the voltage distribution along insulator strings of 750kV overhead transmission line. Using 3-dimension finite element method (FEM) for static state electrical field, the voltage distribution along insulator strings of 750kV overhead transmission line is analyzed and calculated, while the influences of dieletric of insulator, shielding ring, transmission line and transmission tower on voltage distribution along the string are considered. The calculation results and the measured results are compared and the reasons causing the error are analyzed. According to the calculation results it is suggested that adding shielding ring to glass insulator strings to reduce the voltage percentage bearing by the first piece of insulator. It is feasible and effective to apply 3-dimesion FEM to the calculation of voltage distribution along the insulator strings in high voltage transmission line, and this method can be used to the calcualtion and analysis of the voltage distribution along the insulator strings under more complicated conditions.

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