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。本文以7片串XP-160绝缘子为例,开展染污绝缘子串直流污闪放电模型研究。提出染污绝缘子串直流放电过程的电路模型是由剩余污层电阻、沿面电弧和空气间隙电弧串联组成;根据模型计算所得的临界污闪电压与实测值的误差在7%以内;得到泄漏电流大于200mA时,染污绝缘子串局部电弧的综合受力中热浮力起主导作用,解释了局部电弧发展中存在飘弧现象的原因。
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. Take seven units of XP-160 for example, the paper studies the DC pollution flashover model of polluted insulator string. The electrical circuit model explaining the DC flashover process of polluted insulator string is put forward in this paper, which consists of a surface arc, air gap arc and residual resistance of the pollution layer. The relative error of critical pollution flashover voltage obtained by the model and the experimental result is in seven percent. It also shows that the thermal buoyant force may take dominant action when the leakage current is larger than 200 milliampere during the flashover process for the polluted insulator string and thus explains the reason that the partial arc may derive from the surface of insulator.
出处
《电工技术学报》
EI
CSCD
北大核心
2009年第4期36-41,共6页
Transactions of China Electrotechnical Society
基金
国家重点基础研究发展计划(973项目)(2009CBT24503)
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
直流
绝缘子串
污闪模型
泄漏电流
DC, insulator string, pollution flashover model, leakage current
