模拟山火条件下导线-板间隙击穿特性影响因素分析  

Influence Factors Analysis of the Conductor-Plane Gap Breakdown Characteristic under Simulation Forest Fire Condition

作　　者：黎鹏[1] 阮江军[1] 黄道春[1] 魏晗[1] 秦知航 龙明洋 

机构地区：[1]武汉大学电气工程学院,武汉430072

出　　处：《电工技术学报》2018年第1期195-201,共7页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金面上项目资助(51677138)

摘　　要：利用模拟山火试验平台,开展导线-板间隙在不同燃烧条件下的工频击穿特性,分析植被类型、燃烧强度、风速和坡度等因素对间隙击穿特性的影响机制。结果表明:不同类型植被火焰下,间隙的击穿特性差异较大,杉树枝叶和杉树干火焰下,间隙的工频击穿电压分别约下降为纯空气间隙的10%和20%;当火焰桥接全部间隙时,植被燃烧强度对间隙击穿特性的影响较小;随着坡度的增加,火焰间隙的绝缘强度出现大幅度下降。因此,对实际输电线路,需重点关注坡度较大的地方,特别是"V"形山谷位置,更易出现山火引发线路跳闸事故。The AC breakdown characteristics of conductor-plane gap under different combustion conditions were carried by the simulation forest fire test platform in this paper, and the influence mechanisms of vegetation types, combustion intensity, wind speed and slope gradient on the breakdown characteristic of gap have been analyzed. Results show that, the breakdown characteristics of gap have big differences under different vegetation types flame. Under the conditions of fir branches and fir wood crib flames, the AC breakdown voltage of gap can decline to about 10% and 20% of that in the pure air gap, respectively. When the gap is full bridged by the flame, the combustion intensity has little influence on the breakdown characteristics of gap. The dielectric strength of gap is remarkably decreased with the increase of slope gradient. Hence, to the actual transmission lines, it is need to focus on the place with bigger slope gradient. Especially the location of ＂V＂ shape valley, which is more likely to appear the tripping accidents due to the forest fire.

关 键 词：山火 输电线路 击穿特性 风速 坡度 

分 类 号：TM85[电气工程—高电压与绝缘技术]