220kV CVT二次电压降低原因分析及防范措施  

Cause Analysis and Preventive Measures Research on Secondary Voltage Reduction of 220 kV Capacitor Voltage Transformer

作　　者：闫柯柯 穆永保 任炳旭 徐庆华 杨甲 YAN Keke;MU Yongbao;REN Bingxu;XU Qinghua;YANG Jia(State Grid Handan Electric Power Supply Company,Handan 056035,China)

机构地区：[1]国网河北省电力有限公司邯郸供电分公司,河北邯郸056035

出　　处：《河北电力技术》2024年第1期56-60,共5页Hebei Electric Power

摘　　要：针对一起运行中220 kV电容式电压互感器二次电压降低典型故障,通过带电检测、试验分析、解体检查等环节,分析励磁、变比、油色谱等试验过程中的异常数据,查找并确定二次电压降低故障原因主要有2个:一是电磁装置的中间变压器高压接线端子未可靠紧固,形成一次回路串联接触电阻;二是二次绕组引线绝缘皮质量不佳,运行中出现局部开裂,产生二次绕组并联接触电阻。结合故障原因,从产品设计、制造、选用和设备日常运维检测等方面提出防范措施。In this paper,a typical case of secondary voltage reduction fault of 220 kV capacitor voltage transformer is introduced.Through the charge detection,test analysis,disassembly inspection and other links,the abnormal data in the process of excitation,conversion ratio,oil chromatography and other tests were analyzed.There are two main reasons for the secondary voltage reduction fault.Firstly,the high-voltage wiring terminal of the intermediate transformer of the electromagnetic device was not reliably tightened,forming a series contact resistance of the primary loop.Secondly,the quality of the secondary winding lead insulation was poor,and local cracking occured during operation,resulting in secondary winding parallel contact resistance.Combined with the causes,preventive measures are put forward from the aspects of product design,manufacturing,selection and equipment daily operation and maintenance inspection.

关 键 词：电容式电压互感器 二次电压 二次绕组 接触电阻 

分 类 号：TM451.2[电气工程—电器]