大气条件下复合绝缘子端部电晕放电产生的等离子体诊断方法研究

Research on Diagnostic Method of Plasma Caused by Corona Discharge on Composite Insulator Top Under Atmosphere Conditions

高压复合绝缘子在运行时端部产生电晕放电,造成绝缘子端部电荷累积,生成等离子体团,随着绝缘子运行条件恶化,可能导致端部等离子体团的参数不断变化,缩短了有效绝缘距离。对此部分等离子体的参数进行诊断研判,设计并完成了复合绝缘子人工污秽试验,通过调节人工污室运行参数模拟绝缘子实际运行状况,用朗缪尔探针法和发射光谱法完成对绝缘子单个状态下端部电晕放电产生的等离子体参数诊断。试验结果表明,2种方法均为气体放电等离子体的有效诊断方法,诊断结果基本相符;电晕放电产生等离子体的参数与绝缘子运行状态之间具有趋势性对应关系。试验结果对绝缘子闪络过程研究具有重大意义。

When a high voltage composite insulator is running online,there occurs corona discharge on both ends of it,which makes electricity particles accumulated on the top of the insulator.As the result,plasma is produced by corona discharge.With the incessant deterioration of running conditions,it is possible to make the plasma parameters change constantly to shorten part of creep distance.Therefore,it is undoubtedly significant to diagnose the plasma parameters for flashover mechanism research of contaminated composite insulators.Based on this,a composite insulator artificial contaminated test is designed and completed.The running conditions of insulator are simulated by adjusting the running parameters of the artificial contaminated lab,and the plasma parameters at certain running status are diagnosed by both Langmuir probe method and emission spectrum method.The test shows both of the two methods are valid for plasma diagnostic caused by corona discharge on the top of composite insulator,and the diagnostic results obtained by the two methods are accordant.The plasma parameters caused by corona discharge are in accordance with insulator's running status in trend.The experimental results are significant to the study of insulator flashover process.