木垛火导致高压输电线路跳闸的模拟实验研究  

Experimental Study on Flashover of High-voltage Transmission Lines Induced by Wood Crib Fire

作　　者：尤飞[1] 陈海翔[1] 张林鹤[1] 张云[2] 周建军[1] 朱霁平[1] 

机构地区：[1]火灾科学国家重点实验室(中国科学技术大学),安徽省合肥市230026 [2]中国南方电网超高压输电公司梧州局,广西壮族自治区梧州市543002

出　　处：《中国电机工程学报》2011年第34期192-197,共6页Proceedings of the CSEE

基　　金：中央高校基本科研业务费专项资金;国家自然科学基金(50906039);中国南方电网超高压输电公司委托项目"山火引发线路跳闸的研究"~~

摘　　要：为确定山火作用下高压输电线路间空气间隙的击穿特性及机制,利用模拟实验研究了工频高压作用下单股、双分裂和四分裂模拟导线与地之间间隙在木垛火作用下的击穿特性,并与空气中间隙的击穿特性进行了比较。实验结果表明木垛火焰可显著降低高压导线的平均击穿场强。高压导线在木垛火稳定燃烧期火焰作用下和在熄灭阶段火羽流作用下的平均击穿场强与空气中相应值的比值分别为27.3%～33.5%和39.4%～48.4%(实验值),均分别低于根据木垛火高温影响平均击穿场强公式计算所得稳定火焰中和熄灭火焰中的相应比值,即37.4%和49.8%(计算值)。这表明木垛火击穿实验中火焰的高温效应是降低平均击穿场强的主要原因,而火焰的电离作用相对次要。In order to determine the influences of forest fire on the flashover property and mechanism of air gap under high voltage transmission lines,the flashover characteristics of simulative AC high-voltage transmission lines（single-bundle conductor,double-bundle conductor and four-bundle conductor） under the effect of wood crib fire were investigated and compared with the gap breakdown characteristics in air.Results show the average breakdown field strengths of transmission lines are remarkably decreased by wood crib flame.The measured ratio values of the average breakdown field strengths of gap in stable flame and in extinguishing flame to those in air（27.3%～33.5% and 39.4%～48.4%,respectively） are found to be lower than the calculated ratio values（37.4% and 49.8%,respectively）,which are obtained by the proposed formulas that calculate the breakdown field strength under the high temperature field of wood crib fire.These results indicate that high flame temperature is the primary factor while flame ionization is secondary contributing to the reduction of breakdown filed strength.

关 键 词：跳闸 空气间隙 高压输电线路 木垛火 平均击穿场强 

分 类 号：TM852[电气工程—高电压与绝缘技术] TM713