SF_6电流互感器介损因数与电压相互关系的研究

Study on Relationship Between Dielectric Loss Factor of SF_6 Current Transformer and Voltage

根据实际SF_6电流互感器建立了介质损耗研究平台,采用了正接法、反接法对CT进行了介损测量。结果表明当采用底座悬空且二次侧与底座不连的正接法接线方式测量时,正常设备介损因数随电压的升高逐渐减小;而当采用底座与二次侧相连的正接法接线方式进行测量时,正常设备的介损因数随电压的升高稍有增大或不变;当采用反接法测量时,对于不同绝缘结构CT的介损因数基本不交。

The experimental platform of loss measurement is set up, loss is measured by normal wired method and reverse wired method. The results are as following： when the secondary suspension is not connected with the substructure, the normal equipment＇s dielectric loss factor decreases with voltage increasing; when the secondary suspension is connected with the substructure, the normal equipment＇s dielectric loss factor increases slightly or remain stable with the voltage increasing; when reversed wired method is used, there is no variation in CTs of different insulation structure.