330kV电容式电压互感器测试数据异常原因分析

针对青铜峡变电站330 kV母线电容式电压互感器(Capacitive Voltage Transformer,CVT)自激法测试过程中出现的问题,对异常数据进行了详细分析,逐一排除了试验仪器、测试方法及运行情况等因素对试验结果造成影响的可能性,并通过理论计算和现场复测结果的对比,验证了分析过程。结果表明:引起测试数据异常的主要原因是接地刀闸未完全拉开,形成分流回路。因此,在电容式电压互感器测量前,应仔细检查与CVT相连接的其他设备是否有接地刀闸触头虚接、接地线未拆除等情况,避免测试过程中引入分流支路,干扰测试结果判定。

Abnormal cause analysis on test data of 330 kV capacitive voltage transformer

Aiming at the problems of self-excitation method test of 330 kV capacitive voltage trans?former (CVT) in Qingtongxia Substation, analyzes in detail the abnormal data, one by one excludes theprobability of influence of the factors such as experimental appliances, test method and operation sta?tus on the test results. By comparing the result of theoretical calculation and the locale retest, verifiesthe analysis process. The result shows the earthing blade not to pull out fully and to come into beingshunt circuit is the main reason of test data abnormality. So before measuring CVT, must carefullycheck the equipments connected with CVT whether have the phenomenon of the contacts of earthingblade virtual connection and earthing wire not to be dismantled, avoids bringing shunt circuit in testprocess to disturb the judgment of the test results.