高压直流单回输电线路耐雷性能研究

Ｒesearch on Lightning Protection Performance of HVDC Single － circuit Transmission Line

摘要:

近年来，中国高压直流输电线路比例显著增加，线路的雷击事故也随着增加。建立了以杆塔多波阻抗为基 础的反击闪络模型以及考虑地面倾角和接地电阻作用的绕击模型; 依据具体运行杆塔模型，研究了雷暴日、地闪密 度和接地电阻对反击跳闸率的影响规律，同时也分析了雷暴日、地闪密度和倾角对绕击跳闸率的影响规律; 最后， 采取有效的措施降低跳闸率，安装避雷器后线路的反击和绕击耐雷水平各增加了 32． 5% 和 162． 3% ，线路总跳闸率 明显降低。

Abstract:

In recent years，with the scale expansion of EHV/UHV transmission lines，the accidents caused by lightning stroke are increasing． Lightning stroke performance analysis model based on multi － wave impedance of the tower is established，at the same time，lightning performance of winding analysis model is established which takes the action of ground inclination and grounding resistance into account． Aiming at the tower model in a running line，the influence rules of thunderstorm day， ground lightning density and grounding resistance on the tripping rate of counterattack are analyzed，and the influence rules of thunderstorm day，ground lightning density and ground inclination on shielding failure tripping rate are also analyzed． At last， after the surge arresters are installed，the back － flashover resistance level and the lightning shielding failure proof level of the circuit increase by 32． 5% and 162． 3% respectively，and the total tripping rate of the circuit decreases obviously．