电容元件温度特性、老化和受潮对CVT计量精度的影响研究  

Study on Influence of Temperature Characteristics,Aging and Moisture of Capacitor Element on CVT Metering Accuracy

作　　者：李鹏程 徐宏伟 丛中笑 贺鹏[2] 陈翔翔 LI Pengcheng;XU Hongwei;CONG Zhongxiao;HE Peng;CHEN Xiangxiang(Guizhou Electric Power Corporation Metering Center,Guiyang 550000,China;State Key Laboratory of Power Transmission Equipment&System Security and New Technology,Chongqing University,Chongqing 400044,China)

机构地区：[1]贵州电网有限公司计量中心,贵阳550000 [2]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《电力电容器与无功补偿》2020年第5期88-94,共7页Power Capacitor & Reactive Power Compensation

摘　　要：电容式电压互感器(capacitor voltage transformer,CVT)的电容元件等值参数在设备运行过程中会受到环境温度、绝缘受潮和老化等因素的影响而发生改变,从而造成CVT计量误差。文中搭建电容元件试验平台和CVT仿真平台以研究环境温度、绝缘受潮和老化对电容元件等值电气参数和CVT计量精度的影响规律。仿真和试验结果表明,温度升高、受潮与老化程度的增大均导致CVT电容元件的电容值减小,工频介质损耗角正切值增大;且CVT比差和角差均随着温度升高、受潮和老化程度的增加而正向增大。The equivalent parameter of capacitor element of CVT will be changes the operation of equipment due to the influence of such factors as ambient temperature,insulation moisture and aging etc,resulting in metering error of CVT.In this paper,a capacitor element test platform and a CVT simulation platform are built to study the influence rule of ambient temperature,insulation moisture and aging on the equivalent electrical parameter of the capacitor element and the metering accuracy of CVT.It is shown by the simulation and test results show that rise of temperature and increase of moisture and aging lead to the decrease of the c apacitance and increase of dielectric loss of c apacitor element of VCT.Moreover,both ratio and angular error of the CVT increase with the temperature as well as the increase extent of moisture and aging.

关 键 词：电容式电压互感器 温度特性 受潮 老化 计量精度 

分 类 号：TM451.2[电气工程—电器]