特高压直流输电线路雷击故障原因分析与防范

根据中国近年来特高压直流输电线路的运行统计，雷击故障一直处于各类故障的首位，雷害已成为影响特高压直流输电设备安全运行的重要因素。±800 kV特高压直流宾金线是中国清洁能源传输的重要通道，其安全稳定运行显得尤为重要。针对特高压直流宾金线发生的2起雷击故障，结合雷电定位系统、故障录波与测距、现场故障巡查和仿真计算，综合判断2起雷击故障均是雷电绕击造成。根据雷电定位系统实测数据，对特高压直流宾金线进行了雷害风险评估计算，并在雷害风险评估计算的基础上，提出了防范特高压直流输电线路绕击的具体措施。

Analysis and Prevention of the Lightning Fault of UHV DC Transmission Lines

According to the fault statistics of ultra-high voltage (UHV) DC transmission lines in China in recent years, lightning fault is in the first place among all kinds of faults. Lightning damage has become an important factor affecting the safe operation of UHV DC transmission equipment. The ±800 kV UHV DC transmission line from Yibin to Jinhua is an important channel of clean energy transmission in our country, so its safe and stable operation is particularly important. Based on two cases of lightning fault occurring on the Yibin to Jinhua UHV DC transmission line, a comprehensive analysis is made by using lightning location system, fault recording and ranging, field fault inspection and simulation, which indicates that the two lightning faults are both caused by lightning shielding failures. A risk assessment is made on the lightning fault of the Yibin to Jinhua UHV DC transmission line based on the measured data of lightning location system, and some preventive measures are proposed.