隔离开关熄弧模型对特快速暂态过电压的影响  

Analysis on the influence of the quenching process of arc model on very fast transient overvoltage

作　　者：刘教民[1] 杜巍[1] 王震洲[2] 李永刚[1] 

机构地区：[1]华北电力大学电力工程系,河北保定071003 [2]河北科技大学信息科学与工程学院,河北石家庄050018

出　　处：《河北工业大学学报》2013年第5期5-8,共4页Journal of Hebei University of Technology

基　　金：河北省自然科学基金(E2012208006);河北省教育厅高等学校科学研究计划自然科学优秀青年基金(Y2012018);河北省教育厅高等学校科学研究计划自然科学重点项目(ZH2011243);中央高校基本科研业务费专项资金(12QX26)

摘　　要：在特快速暂态过电压(Very Fast Transient Overvoltage,VFTO)的仿真计算中,隔离开关电弧模型的准确程度是影响VFTO计算结果的重要因素.目前,在对隔离开关电弧模型的研究中,大多数研究都集中于电弧的击穿过程,对于隔离开关熄弧过程的研究较少.针对该问题,采用理论分析和仿真计算的方法探讨了隔离开关熄弧模型对特快速暂态过电压的影响.仿真结果表明,与只考虑击穿过程的电弧模型相比,熄弧模型及其相关参数的选取对VFTO的仿真结果影响非常大,当熄弧过程在纳秒时间级内发生时,VFTO的波形和频谱都会受到影响,特高频分量增加;而当熄弧过程在微秒时间级内发生时,VFTO的衰减速度会受到影响,其最大幅值不受影响.本文的工作对于在实际情况下如何选取合理的电弧模型及参数,从而评估VFTO水平具有重要的意义.In the simulation calculation process of very fast transient overvoltage(VFTO), it is the critical factor that gives an accurate description to arc produced in the process of disconnector operation. At present, in the disconnector arc model research, most studies have focused on the breakdown process of the arc. Aiming at this issue, this paper discusses the influence of the quenching process of arc on very fast transient overvoltage based on the theoretical analysis and simulation calculation. The simulation results show that the quenching process of arc has a great influence on VFTO. When the quenching process of arc is accomplished in nanoseconds, the amplitude and gradient of VFTO is all reduced. When the quenching process of arc is accomplished in nanoseconds microseconds, the amplitude and gradient of VFTO remains unchanged. This paper provides a reference to the actual situation of the reasonable selection of arc model and its parameter for VFTO simulation.

关 键 词：隔离开关 熄弧模型 特快速暂态过电压 仿真计算 

分 类 号：TM564.1[电气工程—电器]