配网线径自适应的非接触电压测量研究  

Research on adaptive non-contact voltage measurement of wire diameter in distribution network

作　　者：李昊[1] 符玲[1] 李红艳 叶永杰 彭银柯 Li Hao;Fu Ling;Li Hongyan;Ye Yongjie;Peng Yinke(College of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学电气工程学院,成都611756

出　　处：《仪器仪表学报》2024年第11期79-88,共10页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(52477225)项目资助。

摘　　要：由于10 kV配网架空线路截面积种类众多,当非接触电压装置测量不同线径电压时,会引起线路-电极间耦合电容时变,造成分压比难以确定,无法准确反演线路电压。对此,本文在外铜极不接地的工况下,提出基于电容切换阵列的双探头耦合电容自校准方法,通过在双探头内、外铜极间投切电容消除线径变化对测量结果的影响。其次,推导各测量电压敏感度公式,量化测量误差对反演线路电压的影响,确定探头参数后实现配网线径自适应测量。最后,设计模拟电路并搭建实验平台,完成传感器参数校准以及不同线径自适应测试。实验结果表明:在10 kV配网架空线路截面积从70 mm^(2)变化到150 mm^(2)时,该传感器反演的线路电压与真实线路电压的最大相对误差为2.685%,满足电子式电压互感器标准,进而验证此方法的有效性。Due to the many types of 10 kV distribution network line cross-sectional area,when the non-contact voltage device measures the voltage of different line diameters,it will cause the line-electrode coupling capacitance time-varying,resulting in the difficulty of determining the voltage dividing ratio,and unable to accurately invert the line voltage.In this paper,under the condition that the outer copper electrode is not grounded,the self-calibration method of du-al-probe coupling capacitance based on the capacitance-switching array is proposed,which eliminates the influence of line-diameter variation on the measurement results by casting the capacitance between the inner and outer copper electrodes of the dual-probe.Secondly,the sensitivity formula of each measured voltage is derived to quantify the effect of measurement error on the inverted line voltage,and the optimized probe parameters are used to realize the adaptive measurement of the distribution network line diameter.Finally,the simulation circuit is designed and the experimental platform is constructed to complete the calibration of the sensor parameters and the adaptive testing of different line diameters.The experimental results show that when the cross-sectional area of the 10 kV distribution line changes from 70 mm^(2) to 150 mm^(2),the maximum relative error between the line voltage inverted by the sensor and the real line voltage is 2.685%,which meets the standard of electronic voltage transformer,which in turn can verify the effectiveness of this method.Due to the variety of cross-sectional areas in 10 kV distribution network lines,when the non-contact voltage device measures the voltage of different line diameters,the line-electrode coupling capacitance becomes time-varying.This variation complicates the determination of the voltage dividing ratio,making it difficult to accurately invert the line voltage.In this paper,under the condition that the outer copper electrode is not grounded,the self-calibration method of dual-probe coupling capacitance b

关 键 词：耦合电容 电压测量 电容分压 非接触 参数敏感度 

分 类 号：TM933.2[电气工程—电力电子与电力传动] TH89[机械工程—仪器科学与技术]