110kV串级式电压互感器介损测试方法改进  

Improvement of Dielectric Loss Test Method for 110kV Cascade Voltage Transformer

作　　者：徐贵[1] 江庆霞[1] 王飞龙[1] 王包玉 XU Gui;JIANG Qingxia;WANG Feilong;WANG Baoyu(Baotou Power Supply Bureau, Baotou 014030, China)

机构地区：[1]包头供电局,内蒙古包头014030

出　　处：《内蒙古电力技术》2018年第2期62-65,共4页Inner Mongolia Electric Power

摘　　要：蒙西地区在运110 kV串级式电压互感器的电容和介损测试常采用常规法、末端屏蔽法及末端加压法,3种方法均无法精确测试出一次绕组尾端对辅助绕组端部电容的介损,不利于及时发现电压互感器初期进水受潮缺陷。为此提出一种改进方法,将110 kV串级式电压互感器一次绕组首端直接接地,一次绕组尾端接介损仪的高压线,二次绕组单端接信号线的屏蔽端,辅助绕组单端接信号线,可有效屏蔽一次绕组静电屏对二次绕组的电容,从而准确测出一次绕组尾端对辅助绕组端部电容的介损,据此可以判断110 kV串级式电压互感器的绝缘状态。现场实测结果证实了该方法的可行性。In west Inner Mongolia,capacitor and dielectric loss for110kV cascade voltage transformer are commonly tested by the conventional method,the end shield method or the end pressure method.The aboved methods can not accurately test the dielectric loss between the end of the primary winding and that of the auxiliary winding,so they are not conducive to the detection of the initial influent and dampness of the voltage transformer.In order to solve the problem,an improved test method is proposed,in which,the first end of the primary winding is directly grounded and the high voltage wire of the instrument is connected with the tail end of the primary winding,the shielding line is connected with the secondary wire and the signal line is connected with the auxiliary winding.The improved method can effectively shield the influence of electrostatic shielding,which ensures accurate test results and it is of great significance for cascade voltagetransformer.According to the tested dielectric loss,the insulation state of110kV cascade voltage transformer can be judged and the field measurement results confirm the feasibility of the method.

关 键 词：110kV串级式电压互感器 电容 介损 静电屏 

分 类 号：TM451[电气工程—电器]