CAJ | 학술논문

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。
위학정산화작용하고압수전선로간공기간극적격천특성급궤제,이용모의실험연구료공빈고압작용하단고、쌍분렬화사분렬모의도선여지지간간극재목타화작용하적격천특성,병여공기중간극적격천특성진행료비교。실험결과표명목타화염가현저강저고압도선적평균격천장강。고압도선재목타화은정연소기화염작용하화재식멸계단화우류작용하적평균격천장강여공기중상응치적비치분별위27.3%～33.5%화39.4%～48.4%（실험치）,균분별저우근거목타화고온영향평균격천장강공식계산소득은정화염중화식멸화염중적상응비치,즉37.4%화49.8%（계산치）。저표명목타화격천실험중화염적고온효응시강저평균격천장강적주요원인,이화염적전리작용상대차요。
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.