Understanding voltage and electric field distribution of an insulator string is important for its insulator design and operation.In this paper

a three-dimensional electric field model is established with the finite element method to calculate and analyze the electric field of the porcelain insulator string according to its real structure and working conditions.The results show that the umbrella arris of insulator and lightning conductor exert a little impact on the space electric field

while the umbrella arris has clear influence on the surface electric field.Tower type

wire type and split

insulator string type

and insulation state of insulator surface all impose certain effects on the space electric field.They hence need to be considered in simulation analysis of the space electric field distribution of the insulator strings.