1000kV输电线路带电作业安全距离研究

为确定1000kV交流特高压输电线路带电作业的安全距离,分析了我国第一条特高压线路带电作业操作过电压水平及概率密度,介绍了带电作业危险率计算过程和修正方法,结合特高压输变电试验示范工程的实际进行了各种工况位置的安全距离的试验研究,得出1000kV输电线路直线塔边相、中相、耐张串的带电作业安全距离的操作冲击放电特性,通过危险率计算分析确定了1000kV交流输电线路带电作业最小安全距离。研究结果可为1000kV交流特高压输电线路的带电作业提供依据和技术支撑。

Research on Minimum Approach Distance for Live Working on 1000 kV AC Transmission Line

Based on the practice of the 1000kV AC transmission line project, experimental investigations of approach distance for live working on different working positions on 1000kV AC transmission line were carried out. The research on minimum approach distance for live working on UHV (Ultra High Voltage) transmission line was based on the practice of Jindongnan Nanyang Jingmen (Jin-Nan-Jing) pilot project. The results indicate that it is safety and feasible to develop live working on 1000kV AC transmission line in China. In this paper, Switching Overvoltage level and correspding probability density of live working on the first AC UHV transmission line in China were analized; the calclution and correction method of live working risk was discussed; and the switching impulse discharge performances of live working electric structure on outer phase, middle phase and tension string on 1000kV AC transmission line were studied. Based on the results, by calculation and analysis of the risk, the minimum approach distance for live working was determined. The results of this experimental investigation provide technical support and are available for reference to perform live working on 1000kV AC transmission line.