Research on Electric Field Distribution and Protection Technology of Live line Workers on ±500kV Flexible DC Transmission Lines

Abstract

Taking the transmission line in Zhangbei flexible project as the research object, ANSYS software was used to construct the electric field simulation model of DC ±500kV single-circuit, live working personnel of the same tower double-circuit transmission line under typical working conditions, and the typical entry into the selection. The electric field and potential of the human body surface at the site were calculated, and the influence of the return line on the electric field and potential distribution of the body surface of the charged workers was analyzed. The results show that the body surface electric field values of the head, hand and foot parts are large (maximum 697kV/m), and the shielded clothing with 60dB shielding efficiency should be worn from the ground potential into the equipotential. the spatial electric field of the double-circuit transmission line on the same tower and the electric field of the human body surface at some calculation points are affected, but the distribution of space potential and human body potential has little effect. The research results can provide reference for the research and standardization of safety protection technology for live workers. The spatial electric field distribution in the double-circuit line on the same tower converges toward the return line; the electric field at the position 1 and position 5 is larger than the electric field at the same position in the double-circuit line without the return line, at position 3 and position 7 are smaller than, but have little effect on space potential and human body potential; The research results can provide reference for the research and standardization of safety protection technology for live workers.