10 kV宽频直流电压互感器设计  

Design of 10 kV Wide Frequency DC Voltage Transformer

作　　者：钟立华 潘峰 李金莉 纪伊琳 宋宏天 林晓明 ZHONG Lihua;PAN Feng;LI Jinli;JI Yilin;SONG Hongtian;LIN Xiaoming(Metrology Center of Guangdong Power Grid Co.,Ltd.,Guangzhou 510080,China;Electric Power Research Institute,CSG,Guangzhou 510663,China;Guangdong Provincial Key Laboratory of Intelligent Measurement and Advanced Metering of Power Grid,Guangzhou 510700,China)

机构地区：[1]广东电网有限责任公司计量中心,广州510080 [2]南方电网科学研究院,广州510663 [3]广东省电网智能量测与先进计量重点实验室,广州510700

出　　处：《南方电网技术》2024年第11期31-37,共7页Southern Power System Technology

基　　金：贵州省科技计划资助项目(黔科合支撑[2022]一般015);中国南方电网有限责任公司科技项目(GDKJXM20220200)。

摘　　要：10 kV阻容分压原理的直流电压互感器在实际工况下的阻容匹配关系不易满足,使其响应带宽不能满足要求。基于10 kV阻容分压原理的直流电压互感器在实际工况下的等效电路及其参数,建立了实际工况下的频率特性传递函数模型。分析了直流电压分压比和频率特性的影响因素,获得了分压电阻初始精度对直流电压分压比影响程度、分压电容初始精度和杂散电容对频率特性影响程度的定量结果。提出在阻容分压器低压臂并联阻容匹配单元的解决方法,结合阻容分压器分压主体电阻电容参数的选取,可通过匹配电阻校准直流电压分压比,并通过匹配电容补偿直流电压互感器的频率特性。最后,进行了样机试验,结果表明匹配电阻将直流电压分压比10 000∶5.015校准到了设计值10 000∶5,匹配电容使10 kV直流电压互感器在50 Hz~3 kHz的带宽内幅值误差从高达14%降低到接近1%。The resistance-capacitance matching(RCM)relationship of 10 kV DC voltage transformer(DCVT)based on the principle of resistance capacitance voltage division(RCVD)is not easy to meet under actual working conditions,making its bandwidth unable to meet the requirements.According to the the equivalent circuit and parameters of 10 kV DCVT based on the principle of RCVD under actual operating conditions,the frequency characteristic transfer function is established,and the influencing factors of DC volt⁃age divider ratio and frequency characteristic are analyzed.The quantitative effect of the initial accuracy of the resistor on the DC voltage divider ratio and the degree of influence of the initial accuracy of the capacitor and stray capacitance on frequency characteristic are obtained.A method of parallel connection of the resistance capacitance matching unit(RCMU)in the low-voltage arm of RCVD is proposed,which combines the selection of resistance-capacitance parameters of the main body of RCVD,and the DC voltage divider ratio can be calibrated through the adjustable resistor in RCMU,and the frequency characteristics of the DCVT can be compensated through the adjustable capacitor in RCMU.Finally,a prototype experiment is conducted,and the results show that the matching resistance calibrates the DC voltage division ratio from 10000:5.015 to the design value 10000:5,and the matching capacitance reduces the amplitude error of 10 kV DC voltage transformer from 14%to nearly 1%within the bandwidth of 50 Hz to 3 kHz.

关 键 词：直流电压互感器 阻容分压器 阻容匹配 频率特性 

分 类 号：TM73[电气工程—电力系统及自动化]