基于实测空间泄漏法的500 kV避雷器上节泄漏电流测试研究

Research on Upper Section Leakage Current Test of the 500 kV Surge Arrester Based on Actual leakage Test Method

在高湿度、强电场干扰环境下进行的500 kV避雷器上节停电测试工作中,项目组对比中节与下节测试结果,发现上节测试结果普遍存在偏大的情况。项目组根据实验室模型测试和现场实测,本项目验证了500 kV避雷器上节停电预试中,由于加压点对均压环的空间泄漏电流存在,造成了不可忽略的误差。项目通过对上节停电预试的方法进行改进,实测出加压点对均压环空间泄漏电流,提高了测试准确性。保证了500 kV避雷器上节停电预试结果的可靠性。

We usually encounter difficulties in preventive test work of 500 kV lightning arrester upper section under the circumstances of high humidity and strong electric field interference. As it is,we found the upper section testing data are generally larger than the middle section’s. Through model testing in the laboratory and field testing in the substation,the project team verified that the upper leakage current between the point( where applied voltage) with the corona ring cannot be ignored,which bring in error.The project team improved the test method by measuring the leakage current between the points with the corona ring,thus improved the accuracy of the testing. The reliability of the pre-test results of the power failure on the 500 kV arrester is guaranteed.