摘要
绝缘子污秽闪络事故严重威胁电力系统的安全可靠运行,目前国内外对污闪机理的研究主要是以平板模型为基础。本文借助于高速摄像机开展低气压下绝缘子串直流污闪过程研究,结果表明,低气压下绝缘子串直流污闪放电过程中局部电弧的产生与发展存在随机性,且存在多电弧现象;局部电弧发展过程中存在飘弧现象,即局部电弧由沿面电弧和空气间隙电弧两部分组成;低气压下染污绝缘子串闪络距离小于爬电距离;染污绝缘子串直流起弧电压比闪络电压约低15%～35%;低气压下染污绝缘子串更容易起弧,且海拔越高,局部电弧的燃弧时间越短;局部电弧形状与污秽、气压等有关。
Pollution flashover accidents of insulators may threaten the operation safety of power system, whereas, the research on pollution mechanism is based on plate model by now. The paper studies the DC pollution flashover process of insulator string at low air pressure by high speed vidicon. The results suggest that the arising and developing of partial arc, which maybe multi-partial arcs, is stochastic during the DC pollution flashover process of insulator string at low air pressure. Some of the partial arcs may deviate from the surface of polluted insulator string and form the air gap arcs during the pollution flashover process. The partial arcs include two main parts： air gap arcs and surface arcs during the flashover process for the polluted insulator string. The flashover distance of polluted insulator string is shorter than leakage distance under low air pressure. The DC initial arc voltage of polluted insulator string is lower about 15-35 percent than flashover voltage. It is more easily arising partial arc for polluted insulator string under lower air pressure and more height of altitude and shorter time of arc burning. The figure of partial arc is related to pollution and air pressure and so on.
出处
《电工技术学报》
EI
CSCD
北大核心
2009年第4期30-35,47,共7页
Transactions of China Electrotechnical Society
基金
国家重点基础研究发展计划(973项目)(2009CB724503)
重庆大学青年骨干教师创新能力培育基金资助项目
关键词
低气压
直流
绝缘子串
污闪过程
局部电弧
Low air pressure, DC, insulator string, pollution flashover process, partial arc
