基于泄漏电流和环境条件的超高压复合绝缘子在线监测与评估

On-Line Monitoring and Evaluation of EHV Composite Insulators Based on Leakage Currents and Environmental Conditions

因大气、污秽、局放等因素作用而造成运行中的硅橡胶复合绝缘子表面憎水性降低或丧失,将影响电网的运行可靠性。基于泄漏电流和煤粉严重污染环境的500 kV交流葛双一回线(当阳马店段)运行复合绝缘子的在线监测。分析研究随四季环境变量影响而变化的泄漏电流特征量数据,对复合绝缘子憎水性冬季下降夏季恢复的变化特性进行了分析。提出"动态"性能劣化的概念,指出其与季节性运行环境变量的关系,掌握运行中复合绝缘子憎水性暂时损失现象、以及憎水性迁移特性和恢复特性的运行特征,获得对运行复合绝缘子憎水性有效评估。

Because the effect of the atmosphere, pollution, partial discharge. The surface hydrophobicity of the silicon rubber composite insulator in service are reduced or lost, that will affedt the operational reliability of the power grid. Based on the on-line monitoring on the composite insulator in service of 500kV Exchange Ge Shuang a back line （Dangyang Madian paragraph） with serious leak current and coal powder pollution, the leakage current characteristic data, which is changed with the environment variables influence of four seasons, the composite insulator hydrophobic change characteristics that decline in winter and recovered in summer are analyzed, the concept of ＂dynamic＂ performance degradation, the relationship between that and seasonal operation environment variable is indicated, the the operation characteristics of hydrophobicity temporary losses of composite insulator in operation, as well as the hydrophobicity migration and recovery properties are mastered, effective assessment of the hydrophobicity of composite insulator in service is obtained.