隔离开关电弧模型及参数对特快速暂态过电压仿真结果的影响分析

为了研究隔离开关电弧模型及其参数选取对特快速暂态过电压(VFTO)仿真结果的影响,以特高压单机、单变、单回线供电方式的气体绝缘组合电器(GIS)仿真试验回路为例,对隔离开关电弧模型及参数选取情况进行了分析,并采用不同参数的电弧模型对VFTO进行仿真计算,得到了相关模型及其参数对VF-TO仿真结果的影响规律。仿真结果表明,击穿过程对VFTO的陡度影响最大,击穿延时越短,VFTO的陡度越大;稳态燃弧电阻对VFTO的幅值影响最大,燃弧电阻越大,VFTO的幅值越小;熄弧过程会影响VFTO的衰减速度,熄弧时间越长,VFTO衰减的也越慢;为VFTO仿真中GIS隔离开关电弧模型及参数的选取提供了参考,对选取合理的模型及参数进而评估VFTO水平具有重要的意义。

Analysis on the influence of the arc model and its parameter of disconnector on very fast transient overvoltage

In order to study the influence of the arc model and its parameter of disconnector on very fast transient overvoltage,take typical extra-high voltage GIS simulation test circuit as an example to analyse the isolating switch arc model and parameter selection then the VFTO simulation calculation is accomplished under different parameters of the arc model.The simulation results show that gas breakdown process has a great effect on VFTO gradient.the shorter the breakdown time delay,the greater the steepness of VFTO.Steady state arc resistance influences VFTO amplitude.VFTO amplitude is becoming smaller when steady state arc resistance becomes greater.The quenching process of arc will affect VFTO attenuation speed.When the quenching time of arc lengthens,VFTO attenuation speed slows down.This paper provides a reference to the actual situation of the reasonable selection of arc model and its parameter for VFTO simulation which has an important meaning.