750kV及特高压输电线路抑制潜供电弧的方法

为使单相自动重合闸在750kV及特高压输电线路瞬时性故障后可靠重合，必须限制潜供电流和恢复电压。基于一个750kV双端电源供电系统模型，对2种熄灭潜供电弧的方法——使用快速接地开关和并联电抗器中性点接小电抗，采用ATP仿真软件进行了潜供电流及恢复电压的计算，分析比较了2种方法的优缺点。依据仿真数据得出，并联电抗器中性点接小电抗的方法降低潜供电流及恢复电压的效果优于前者。同时针对特高压线路采用单相自动重合闸的优势，提出了并联电抗器中性点小电抗的正确取值范围，从而达到抑制谐振过电压、加速潜供电流熄灭，成功实现单相重合闸的目的。

Secondary arc extinction methods for 750 kV and UHV transmission lines

In order to ensure the successful reelosure of single pole autoreclosor on 750 kV and ultra-high voltage transmission lines, the secondary arc current and recovery voltage must be limited to a certain value. For the two arc extinction schemes-using high speed grounding switch and using the neutral reactor compensation to shunt reactor, the computation of secondary arc current and recovery voltage was presented here, based on a ATP simulating model of 750 kV power system. A comparison analysis for two schemes was showed. Based on the calculation results, the latter is better than the former according to the depression effect to secondary arc current and recovery voltage. At the meantime, with a view to the predominance of single pole autoreclosure on ultra-high voltage transmission line, the value of the neutral reactor is also discussed to limit the resonant over-voltage, to accelerate the extinction of secondary arc, and to ensure the successful reclosure of single pole autoreclosor.