加压方式对山火条件下间隙交流击穿特性的影响研究  

Study of Influence of Voltage Application Modes on AC Gap Breakdown Characteristic Under Fire Conditions

作　　者：黎鹏[1] 黄道春[1] 阮江军[1] 魏晗[1] 秦知航 

机构地区：[1]武汉大学电气工程学院,湖北省武汉市430072

出　　处：《电网技术》2016年第5期1576-1581,共6页Power System Technology

基　　金：高等学校博士学科点专项科研基金(20120141120027);中央高校基本科研业务费专项资金(2015207020201)~~

摘　　要：近年来,山火引发输电线路跳闸事故日益增多,严重威胁电网的安全与稳定运行;国内外针对山火条件下输电线路的击穿特性进行了较多模拟试验研究,但目前尚无统一的加压标准。为了给山火条件下间隙的击穿特性试验标准的制定提供参考,利用模拟山火试验平台,分别采用均匀升压法和升压、耐受相结合法开展了导线–板间隙的交流击穿特性试验,试验结果表明:在2种加压方式下,击穿电压均随时间呈"U"形曲线规律分布,同时击穿电压均随燃烧强度的增大呈现非线性下降;通过对2种加压方式下击穿电压和泄漏电流特性的对比分析,发现当燃烧强度较大时,加压方式对间隙击穿特性影响不大,结合实际山火的特点,推荐模拟山火条件下导线–板间隙的交流击穿特性试验采用升压、耐受相结合的方式。In recent years,increasingly tripping accidents of transmission line caused by forest fires threatened safety and reliable operation of power grids seriously.Although a large amount of simulation tests have been carried out to study breakdown characteristics of transmission line under fire conditions in China and abroad,there is no uniform standard for voltage application.In order to provide a reference for test standard of gap breakdown characteristic under fire conditions,both uniform voltage rising mode and combined mode of voltage rising and withstand were used to carry out AC breakdown characteristic tests of conductor-plate gap with forest fire simulation test platform.Experimental results showed that,under these two voltage application modes,breakdown voltages were U-type curve distributed with time; breakdown voltages were nonlinearly declined with increase of combustion intensity; as combustion intensity was stronger,voltage application modes had little effect on gap breakdown characteristic according to comparative analysis of breakdown voltage and leakage current characteristic under these two voltage application modes.Combining with actual forest fire feature,combined mode of voltage rising and withstand was recommended to carry out AC breakdown characteristic test of conductor-plane gap under fire conditions.

关 键 词：输电线路 山火 燃烧强度 击穿特性 加压方式 

分 类 号：TM721[电气工程—电力系统及自动化]