Live replacement of 1 000 kV tension insulator by the use of combination tools can change voltage distribution of insulator string and affect the surface electric field distribution of the operators at live condition.For the analysis of integral voltage and electric field distribution rule in the case of replacement work of the insulator string at different positions

in this paper

the 3D model is set up in accordance with the actual 1 000 kV tension tower transmission line.The electric field simulation and analysis are performed by the use of finite element method.The submodel method is used to analyze the maximum field value of the combination tools proper at different positions and the surface field intensity distribution of the human body in case of using the combination tools at different positions.It is shown by the analysis result that the closer the combination tools are to the line end

the greater the influence on the potential distribution of the insulator and the electric field distribution of human body will be.Compared with the insulator shorting without the combination tool

the maximum voltage drop of a single insulator from the end of tower to the end near the line is increased by 18.9 kV.The maximum electric field intensity of the combination tool itself is 2 332 k V/m.The maximum electric field intensity of human body is increased after the use of the combination tools

with the maximum amplitude variation from 1 392 kV/m to 1 897 kV/m.At the same time

in case of operating at different positions

the electric field distribution characteristic for all parts of the human body is obtained

which can provide some reference advice for the safe protection for live operators.