变压器绕组局部放电量测量误差计算及其修正方法研究  

Error Analysis and Correction of Partial Discharge Quantity Measurement of Transformer Windings

作　　者：杨玥坪 树婷 吴玖汕 张容浩 赵壮民 孟旋 张轩瑞 李军浩[1] YANG Yueping;SHU Ting;WU Jiushan;ZHANG Ronghao;ZHAO Zhuangmin;MENG Xuan;ZHANG Xuanrui;LI Junhao(State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China;College of Electrical and Power Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,西安710049 [2]太原理工大学电气与动力工程学院,太原030024

出　　处：《西安交通大学学报》2022年第10期122-129,共8页Journal of Xi'an Jiaotong University

基　　金：陕西省重点研发计划资助项目(2021GXLH-Z-080)。

摘　　要：为分析IEC60270标准下电力变压器局部放电测量时因绕组分布纵向电容及衰减特性所带来的视在放电量测量误差并进行修正,提出了包含耦合电容的变压器局部放电分布电容网络模型。通过解析方法,量化了变压器绕组端部的局部放电量测量值随放电位置的变化情况,基于绕组等效RLC网络智能反演算法,提出了一种绕组局部放电频谱定位方法及局部放电量测量误差修正算法,介绍了算法的理论基础与基本思路。以一台变压器绕组电气参数仿真结果,构建了等效RLC网络模型,并以其作为研究算例应用所提修正方法,结果表明,放电量误差随放电位置远离测量端逐渐增大,最大时接近90%,而修正后局部放电量的最大误差比修正前降低了一个数量级,验证了修正算法的可行性,为将其进一步运用于实际变压器建立了一定的基础。This paper proposes a distributed capacitance network model for partial discharge(PD)of transformers with a coupling capacitor to analyze and correct the apparent discharge quantity measurement error resulting from the longitudinal distributive capacitance and the attenuation of transformer windings during PD quantity measurement of power transformer according to IEC60270.The variation of PD quantity measured with the change of the discharge position at the end of the transformer winding is quantified by an analytical method.Then,based on the intelligent inverse algorithm of the winding equivalent RLC network,a winding PD frequency-spectrum localization method and a novel PD measurement error correction algorithm are proposed,and their theoretical basis and operation process are introduced.An equivalent RLC network model is constructed as a research example based on the simulation results of the electrical parameters of a transformer winding,and the proposed correction method is applied.The results show that the error of PD quantity before correction grows larger with the PD location away from the measuring point,and the maximum error reaches near 90%.However,the error after correction is reduced by an order of magnitude,which has verified the feasibility of the proposed correction method and provided a basis for its further application on real transformers.

关 键 词：电力变压器 局部放电 IEC60270标准 局部放电定位 智能优化算法 

分 类 号：TM835[电气工程—高电压与绝缘技术]