CVT带电测试介损异常原因分析  

Cause Analysis of Abnormal Dielectric Loss in CVT Live Test

作　　者：周帆 陈欣 张庆 白添凯 杨超 ZHOU Fang;CHEN Xin;ZHANG Qing;BAI Tiankai;YANG Chao(Kunming Power Supply Bureau of Yunnan Power Grid Co.,Ltd.,Kungming Yunnan 650011)

机构地区：[1]云南电网有限责任公司昆明供电局,云南昆明650011

出　　处：《光源与照明》2020年第5期44-46,61,共4页Lamps & Lighting

摘　　要：CVT进行带电测试时受相间电场的干扰会造成三相之间介损不平衡。通过对CVT物理特性的理论分析,文章建立了等效电路及简化电路模型,分析计算了杂散电容造成的电压波动;根据介损测试原理,研究了干扰电流对介损测试的影响;并利用ANSYS仿真软件,研究了220 kV单相及三相CVT运行时外电场对其的影响。仿真结果表明:CVT三相运行时相间干扰将对其电场及自身电压的分布产生较大的影响,从而干扰介损的带电测试结果。The dielectric loss imbalance between three phases will be caused by the interference of electric field between phases when CVT is tested on line. Based on the theoretical analysis of physical characteristics of CVT, the equivalent circuit and simplified circuit model is established, and the voltage fluctuation caused by stray capacitance is analyzed and calculated. According to the principle of dielectric loss testing, the influence of interference current on dielectric loss testing is studied. The influence of external electric field on 220 kV single-phase and three-phase CVT is studied by using ANSYS simulation software. The simulation results show that the interference between phases during the three-phase operation of CVT will have a great influence on the distribution of electric field and its own voltage, thus interfering with the on-line test results of dielectric loss.

关 键 词：CVT带电测试 电容式电压互感器 介损测试 ANSYS仿真 

分 类 号：TM451.2[电气工程—电器]