±800kV输电线路带电作业电场仿真分析

Simulation Analysis of Electric Field on Live Working of ±800 kV Transmission Line

为了确保±800 kV特高压直流输电线路带电作业过程中线路和作业人员的安全。文中运用Ansoft软件建立了杆塔、绝缘子、线路以及人体的仿真模型,并用有限元分析法对带电作业人员以不同方式进入等电位过程中典型位置的体表场强进行了计算。计算结果表明:采用双人直立式沿绝缘子串进入等电位作业,人移动至绝缘子1/4处时的体表场强约为5~15 kV/m,当人移动至绝缘子1/2处时的人体体表场强约为10~30 kV/m;采用吊篮法进入等电位作业,带电作业人员位于杆塔上地电位作业时,作业人员较安全,吊篮移动至距屏蔽环3 m左右时,人体体表场强约为41~195 kV/m,作业人员达到等电位后,作业人员体表场强超过了510 kV/m,应采取特殊的屏蔽措施。

To ensure the safety of both lines and working staff when live working on ±800 kV ultra-high voltage DC （ UHVDC ） transmission lines. The tower model, insulator model, transmission line model and human body model are established by Ansoft software. The finite element method is used to calculate and analyze the electric field intensity on different parts of the human body. The results show that when two people upright into electric field along the insulator, the surface field of human body, when moves to the 1/4 insulator, is about 5-15 kV/m. The surface field of human body, when moves to the 1/2 insulator, is about 10-30 kV/m. Hanging basket method is used to human body into electric field, human body at the tower cross, are safety. When the hanging basket moves to about 3 m away from the shielding ring, the body surface strength is about 41 - 195 kV/m, and when the operator reaches the equipotential, the surface strength of the operator exceeds 510 kV/m, and special shielding measures should be taken.