一起500kV复合绝缘子操作冲击干耐受电压试验对地闪络事件分析

Analysis of ground flashover of a 500kV composite insulator dry switching impulse voltage withstand test

以±800kV新东直流输电工程新松换流站某500kV交流复合绝缘子操作冲击干耐受电压试验过程中发生的对地闪络事件为背景,以试验现象和试验结果为基础,通过简化试验模型的方式,最终查明试验过程中产生对地闪络现象的根本原因,在未安装试验工装时复合绝缘子均压环对地的操作干耐受电压小于试验电压。探究操作冲击干耐受电压试验时,是否加装试验工装对试验结果影响的机理,为后续试验的开展提供了借鉴。

Taking a 500kV AC composite insulator ground flashover of dry switching impulse voltage withstand test of the±800kV Xin Dong HVDC project Xin Song convertor station as the background,based on test phenomena and test results,the root cause of ground flashover of composite insulator is found by simplified test model method.When the test experiment is not installed,dry switching impulse voltage withstand of composite insulator grading ring to the ground is less than the test voltage.Explore the mechanism of the use of the test experiment on the results of the dry switching impulse voltage withstand test.It provides a good experience for future test.