电容式电压互感器温度特性研究  

Study on Temperature Characteristic of Capacitor Voltage Transformer

作　　者：韩海安 向鑫 王晖南 薛建立 邵龙 李红斌[2] HAN Hai'an;XIANG Xin;WANG Huinan;XUE Jianli;SHAO Long;LI Hongbin(State Grid Shanxi Electric Power Corporation Metering Center,Taiyuan 030032,China;Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]国网山西省电力公司计量中心,太原030032 [2]华中科技大学,武汉430074

出　　处：《高压电器》2021年第5期123-129,共7页High Voltage Apparatus

摘　　要：针对温度附加误差惯用公式无法准确描述CVT实际温度特性的现状,论证环境温度对CVT各组成部分等效参数的影响,结合实际参数研究CVT等效参数的温度偏移对CVT输出误差的定量影响规律,获得准确的温度附加误差公式。仿真发现环境温度影响下,不仅电容分压器电容量变化会造成CVT温度附加误差,直流电阻的温度偏移也是影响CVT温度特性的重要因素,文中以此为基础提出了新的温度附加误差计算公式。通过CVT模型温度试验对仿真分析结果及温度附加误差公式进行验证,试验结果与仿真分析中的规律相吻合。文中提出的温度附加误差公式相比惯用公式具有更高准确性,可用于CVT温度附加误差估计。The usual formulas used to calculate CVT temperature error can not accurately describe the actual temperature characteristics of CVT.In response to this situation,this paper demonstrates the effect of ambient temperature on the equivalent parameters of CVT,studies the influence of the changed equivalent parameters on CVT output error,and obtains accurate additional error formulas.The simulation shows that under the influence of ambient temperature,not only the capacitance of the capacitors dividers will cause additional error,but also the change of DC resistance is an important factor affecting the temperature characteristics of CVT.A kind of formulas to calculate CVT temperature errors are proposed based on that feature.In this paper,the simulation results and CVT temperature error formulas are validated by temperature testing with a CVT model.CVT temperature error formulas proposed in this paper have a higher accuracy than usual formulas and could be applicable to estimate the CVT temperature error.

关 键 词：电容式电压互感器 温度特性 电磁单元 误差特性 附加误差 

分 类 号：TM451.2[电气工程—电器]