The influence of EHV AC lines on the body surface electric field of live working personnel in parallel UHV DC transmission lines

In order to ensure the reliable operation of AC 500kV and DC ± 800kV parallel transmission lines without power failure, the research on live working of UHV DC transmission lines in hybrid lines is carried out. In this paper, the finite element method (FEM) is used to calculate three-dimensional simulation of an equal proportional hybrid lines and human model. Firstly, tower and human body model are set and meshed respectively. Secondly, considering the effect of 500kV AC lines on the live working of parallel ± 800kV DC transmission lines, the electric field on the surface of live workers was calculated by three-dimensional simulation software. Then, the influence of EHV AC lines on the body surface electric field of live working personnel in parallel UHVDC transmission lines is obtained. The results show that, when the worker is 0.3m~0.8m away from the UHVDC positive lines, the larger body surface electric field appears in the hands and head. The maximum range of the worker's body surface electric field is 4224kV/m~9355kV/m. As the distance from the worker to the positive lines increases, the maximum value of the body surface electric field decreases, and the influence of the EHV AC lines on the body surface of the UHV DC lines is gradually increasing. The maximum value of the electric field on the body surface is greater than the stipulation of “Screen clothes for live working”, which the partial electric field on the exposed part of the human body must not be greater than 240kV/m, workers need to wear suitable screen clothes to ensure the successful completion of live working.