短空气间隙弧阻模型的研究  

Study of Arc Resistance Model for Short Air Gap

作　　者：詹花茂[1] 郑记玲[1] 段韶峰[1] 欧阳卓[1] 赵承楠[1] 

机构地区：[1]华北电力大学高电压与电磁兼容北京市重点实验室,新能源电力系统国家重点实验室,北京102206

出　　处：《高压电器》2012年第10期12-16,21,共6页High Voltage Apparatus

基　　金：国家重点基础研究发展计划(973计划)(2011CB209405);国家电网公司科技项目(KG71-09-006)~~

摘　　要：为了研究气体间隙的高频电弧特性,笔者设计了一种短空气间隙的放电试验回路。测量了间隙击穿时两端的电压及通过间隙的电流,经分析计算得到了短空气间隙击穿后电弧的变化规律以及燃弧阶段的弧阻最小值r_0。短空气间隙在击穿后的几十ns内弧阻从10^(12)Ω量级跌落至最小值r_0,持续几个μs后恢复。改变回路频率以获得不同频率下的弧阻最小值r_0以及燃弧持续时间t。当回路频率从4.8～13.5 MHz变化时,r_0从0.4Ω增大到5.0Ω,而燃弧时间t从4.0μs减小为0.9μs。将实验结果与各种电弧电阻模型计算值进行对比,在燃弧前期(0～1.1μs)Kushner电弧模型与实验结果较为吻合,但Kushner电弧模型的燃弧时间比实验值长。In order to study the high-frequency arc characteristics of gas gap, a test circuit for discharges of a short air gap has been built in this paper. The breakdown voltage across the gap and the current is measured, and the variation of arc and the minimum of arc resistance ro is obtained. The arc resistance drops from 1012 ohms to the minimum ro in tens of nanoseconds after breakdown of the short air gap,then recovers after a few microseconds. The minimum ro of arc resistance and the arcing duration t corresponding to different loop frequency are also obtained. When the loop frequency changes from 4.8 MHz to 13.5 MHz, r0 increases from 0.4 to 5.0 Ω, and t decreases from 4.0 μs to 0.9 μs. Comparisonsbetween the experimental results and the calculations by various arc resistance models indicate that the calculation by Kushner＇s arc model agrees well with the experimental result during early stage of arcing period but with longer arcing time.

关 键 词：高频电弧模型 短空气间隙 电弧电阻 

分 类 号：TM864[电气工程—高电压与绝缘技术]