南方电网技术2024，Vol.18Issue(11)：31-37,7.DOI:10.13648/j.cnki.issn1674-0629.2024.11.004
10kV宽频直流电压互感器设计
Design of 10 kV Wide Frequency DC Voltage Transformer
摘要
Abstract
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 10 000:5.015 to the design value 10 000:5,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Key words
DC voltage transformer/resistance capacitance voltage divider/resistance capacitance matching/frequency characteristics分类
信息技术与安全科学引用本文复制引用
钟立华,潘峰,李金莉,纪伊琳,宋宏天,林晓明..10kV宽频直流电压互感器设计[J].南方电网技术,2024,18(11):31-37,7.基金项目
贵州省科技计划资助项目(黔科合支撑[2022]一般 015) （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). Supported by Guizhou Provincial Science and Technology Program(Guizhou Science and Technology Cooperation Support[2022]General 015) （GDKJXM20220200）
the Science and Technology Project of the China Southern Power Grid Co.,Ltd.(GDKJXM20220200). （GDKJXM20220200）
