2022 IEEE International Conference on High Voltage Engineering and Application (ICHVE 2022)

UHV 800kV DC transmission line is a key power facility for long-distance and large-capacity power transmission. Its operational reliability is important to ensure the operational safety of the sending and receiving terminal power grids, and live working is an important technical means to improve the operational reliability and utilization of the line by eliminating defects in a timely manner. In order to comprehensively evaluate the safety of different equal potential methods of live working of ± 800kV transmission line, this paper analyzes the factors affecting the entry path and establishes a path evaluation model based on the fuzz analytic hierarchy process (FAHP).The optimal and most commonly used entry paths are selected for weight calculation, including the entry mode with the lowest electric field on the body surface (135 ° entry), the entry mode with low arc energy (45 ° entry), and the commonly used ones（ The horizontal hanging basket entry and the upper rope ladder access) were compared and calculated. The calculation results show that the 45°hanging basket method is the best path scheme for comprehensive evaluation. The evaluation method can provide data reference for safety protection of ± 800kV UHVDC live working.
 

±800kV transmission line ;Live working ;Equil-potential Entry-Path ;Safety protection ;FAHP