Study on the calculation of shielding failure for dc transmission lines

The Journal of Engineering

Jian Wang¹  Jinbo Wu²  Jinliang He²  Wei Cao³  Shuai Wan³  Shanqiang Gu⁴ 

[1] State Grid Corporation of China;Tsinghua University;Wuhan NARI Limited Company, State Grid Electric Power Research Institute;Xiangyang Guowang Composite Insulators Co., Ltd;

关键词: power transmission lines;    power transmission protection;    power transmission faults;    shielding;    flashover;    power grids;    lightning protection;    DC power transmission;    power transmission reliability;    Ningxia-Shandong DC transmission lines;    ultrahigh-voltage DC lines;    failure trip-out rate;    comprehensive calculation method;    voltage level;    electrical geometric model method;    lightning protection level;    transmission line failure;    shielding failure;   

DOI  :  10.1049/joe.2018.8473

来源: DOAJ

【 摘 要 】

Lightning is the main cause of transmission line failure, and it is important to improve the lightning protection level of the transmission line for the stability of the power system. Traditional solutions for the shielding failure of transmission lines is to use the electrical geometric model method. However, with the improvement of the voltage level, the physical size increases, and the calculation of lightning protection for ultrahigh-voltage dc lines has a greater difference with operating experience. Based on the Ningxia-Shandong dc transmission lines in China, this study utilised the lead development model to describe the flashover of insulators and the breakdown of the gaps. A comprehensive calculation method of shielding failure trip-out rate considering terrain, earth resistance and weather was proposed. The accuracy was much higher when compared with the traditional calculation and the result can be a reference for other similar calculation for dc lines.

【 授权许可】

Unknown