带电作业组合间隙放电特性仿真分析方法

Simulation Method for Discharge Characteristics of Live Working Complex Gap

为实现对输电线路带电作业安全距离的仿真研究,以长间隙流注–先导的起始和发展机制为基础,结合带电作业组合间隙放电试验观测现象,建立了带电作业组合间隙放电发展物理模型。考虑作业人员和先导–流注放电产生的空间电荷的共同作用,采用模拟电荷法（CSM）建立了组合间隙中空间电场分布的计算模型,通过耦合流注–先导的发展和转化过程,实现了对组合间隙的击穿电压、先导–流注放电发展的空间位置和空间电荷等特征量的准确计算,通过与试验数据对比验证了该方法的有效性。对组合间隙放电特性的仿真研究表明,作业人员位置改变引起的空间电荷量和先导起始的变化对组合间隙放电发展具有双向作用,引起的最低放电位置在人员距导线0.4~0.45 m区域内,与试验数据具有较好的一致性。

In order to realize simulation research on the discharge characteristics of complex gap in live working,we put forward a physical discharge model for complex gap based on the mechanism of streamer-leader inception and development and experimental observation.Considering the influences of the worker and discharge space charge,we established a calculation method of space electric field by charge simulation method（CSM）,and calculated the breakdown voltage,spatial location of leader and streamer,and space charge in the complex gap by coupling with the inception and development of leader-streamer.Besides,the simulation research indicated that the variation of accumulated space charge and leader inception caused by the working position have bidirectional effects on the discharge development,and the lowest discharge position is about 0.4~0.45 m away from the high voltage conductors.The simulation results show good agreement with the actual measurement values.