多间隙灭弧结构熄灭工频电弧的仿真与试验  

Simulation and Experiment on Arc Quenching Structure With Multi-gaps to Quench the Power Frequency Arc

作　　者：郭婷[1] 周文俊[1] 黄海鲲[2] 许军[2] 苏梓铭[3] 邱凌 冷小聪 

机构地区：[1]武汉大学电气工程学院,湖北省武汉市430072 [2]国网福建省电力有限公司电力科学研究院,福建省福州市350007 [3]中国电力科学研究院,湖北省武汉市430074 [4]武汉新电电气技术有限公司,湖北省武汉市430073 [5]国网随州供电公司,湖北省随州市441300

出　　处：《中国电机工程学报》2016年第10期2853-2861,共9页Proceedings of the CSEE

摘　　要：为研究多间隙灭弧结构遭雷电过电压击穿后熄灭工频续流电弧的能力,分析了多间隙灭弧室内的灭弧过程及可能的熄弧方式,并基于Mayr电弧模型理论,针对10 k V电压等级,建立了多间隙灭弧结构击穿后的电弧动态模型,计算了工频续流过零时电弧的熄灭过程,对影响熄弧效果的因素进行了分析;最后利用冲击与工频续流试验相结合的联合试验平台对具有多间隙结构的装置进行了联合试验。仿真与试验结果表明:较小的时间常数以及较高的耗散功率有利于工频续流电弧的熄灭,而多间隙灭弧结构能拉长电弧的特点能同时满足以上两点要求;联合试验时,多间隙灭弧结构能在闪络后的续流阶段快速熄灭电弧,熄弧发生在续流的第一个过零点时刻,熄弧后随着工频电压的恢复,该结构不会发生再次击穿;由于电弧在工频续流阶段存在一定的弧道压降,可保证输电线路不会发生短路性过流保护引发的跳闸事故。In order to study the ability of the arc quenching structure with multi-gaps to quench the power frequency arc,the dynamic model of the arc generated by the breakdown of the 10 kV arc quenching structure was established based on the Mayr arc model theory;the arc quenching process during the power frequency follow current through the zero stage was calculated also,and a combined testing was carried out by using an integrated test for the power frequency and lightning-impulse.The results show that a smaller time constant and a higher dissipation power P are good for the power frequency arc quenching,and the characteristics of elongating arc by the multi-gaps can meet the above two requirements.In combined test,this structure can quench the arc quickly after the flashover,and the quenching time occurs at the time of power frequency follow current crossing the zero stage.After the arc extinction,the arc will not occur again with the recovery of the power frequency voltage.Because of the arc path pressure voltage drop,it can guarantee that the power system will not occur trip accident caused by short-circuit overcurrent protection.This shows that the structure can protect the insulator from lightning without flashover,and its ability to quench the power frequency arc quickly can avoid the coincidence brake accident.

关 键 词：多间隙灭弧结构 Mayr电弧模型 工频续流 联合试验 熄弧能力 

分 类 号：TM862[电气工程—高电压与绝缘技术]