电场对CVT计量误差特性影响研究  

Study on Influence of Electric Field on Measurement Error Characteristics of CVT

作　　者：徐宏伟 李鹏程 丛中笑 杜林[2] 贺鹏[2] 詹得铭 XU Hongwei;LI Pengcheng;CONG Zhongxiao;DU Lin;HE Peng;ZHAN Deming(Metering Center of Guizhou Electric Power Co.,Ltd.,Guiyang 550000,China;State Key Laboratory of Power Transmission Equipment&System Security and New Technology)

机构地区：[1]贵州电网有限责任公司计量中心,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3期79-86,共8页Power Capacitor & Reactive Power Compensation

摘　　要：实际运行表明:电场是影响电容式电压互感器(CVT)计量误差的重要因素之一。为了分析周围电场对CVT计量误差特性的影响,文中采用有限元仿真软件分析周围物体、高压引线及相间干扰对220 kV等级CVT计量误差特性的影响。仿真结果表明:随着物体电位U的增加,CVT计量误差基本呈线性增加变化,且线性度与物体距离D有关;CVT计量误差随着物体与CVT之间距离D的增加呈逐渐减小趋势,当距离大于3 m时,可以忽略周围物体对220 kV CVT计量误差造成的影响。高压引线对CVT误差的影响与高压引线的几何参数即引线的长度、直径以及其与CVT水平方向的夹角有关。对于三相220 kV CVT而言,在考虑变电站电气设备实际布置与安全规定下,相间距离选择为4 m最佳。同时在仿真基础上,搭建试验平台,验证了仿真结果的正确性。It is shown by the actual operation that the electric field is one of the important factors affecting the measurement error of the capacitor voltage transformer(CVT).In order to analyze the influence of electric field on CVT measurement error,finite element simulation software is used in this paper to analyze the influence of surrounding objects,high voltage leads and phase interference on the error characteristics of 220 kV CVT.It is shown by the simulation result that the CVT measurement error increases linearly with the surrounding object potential U,and the linearity is related to the object distance D.As the object distance D increases the CVT measurement error gradually decreases.When the distance is greater than 3 m,the error caused by the surrounding objects to the 220 kV CVT is negligible.The effect of the high voltage lead on the CVT error is related to the length and diameter of the lead and its angle to the horizontal direction of the CVT.For the three-phase 220 kV CVT,considering the actual arrangement and safety regulations of the substation electrical equipment,the phase-to-phase distance is chosen to be 4 m optimal.Meanwhile,on the basis of simulation,the experimental platform is built to verify the correctness of the simulation results.

关 键 词：电场 电容式电压互感器(CVT) 误差特性 杂散电容 相间干扰 

分 类 号：TM451.2[电气工程—电器]