基于差分输入结构的MOA在线监测用电场探头设计  

Design of Electric Field Probe for MOA On-Line Monitoring Based on Differential Input Structure

作　　者：侯峰 丁旭元 胡晓耘 闫敬东 周童浩 潘攀 汲胜昌[2] HOU Feng;DING Xuyuan;HU Xiaoyun;YAN Jingdong;ZHOU Tonghao;PAN Pan;JI Shengchang(State Grid Ningxia Electric Power Company Limited Training Center,Yinchuan 750011,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]国网宁夏电力有限公司培训中心,银川750011 [2]西安交通大学电力设备电气绝缘国家重点实验室,西安710049

出　　处：《电瓷避雷器》2022年第6期25-30,151,共7页Insulators and Surge Arresters

基　　金：国家自然科学基金—国家电网公司智能电网联合基金(编号:U1766223)。

摘　　要：参考电压波形是金属氧化物避雷器(MOA)在线监测中的关键参数。针对从电压互感器或利用现有电场探头获取参考电压存在的绝缘和误差等问题,根据MOA在线监测的实际需求研制出一种新型电场探头。新型电场探头采用差分输入结构,去除了接地端。同时,利用面积相同的差分电极对共模干扰的抑制能力,可实现对一字排列安装的三相MOA母线电压波形的获取。对新型电场探头的响应能力和抗干扰能力进行了实验,实验结果表明,本研究设计的电场探头对MOA母线电压基波和各次谐波分量具有良好的响应,电压相位和谐波含量误差较小。且其具有良好的抗干扰能力,可准确地获取三相母线电压波形,符合MOA在线监测的需求,具有较强的实际应用价值。Reference voltage waveform is a key parameter in on-line monitoring of metal oxide surge arrester(MOA).Considering the problems such as insulation and inaccuracy in obtaining reference voltage from potential transformer or using existing electric field probe,a new type of electric field probe is proposed according to the actual demands of MOA on-line monitoring.The new type electric field probe adopts differential input structure,so the grounding terminal is removed.Meanwhile,by using the differential electrodes with the same area to suppress the common mode interference,it can obtain the bus vol-tage waveforms of the three-phase MOA with lateral arrangement.The response ability and anti-interference ability of the new type electric field probe are tested.The experimental results show that the electric field probe designed in this paper has good response to the fundamental and harmonic components of MOA bus voltage,and its error of voltage phase and harmonic content is small.Meanwhile,it has good anti-interference ability,can accurately obtain three-phase bus voltage waveform.Therefore,the new type electric field probe meets the requirements of MOA on-line monitoring and has strong parctical application value.

关 键 词：金属氧化物避雷器 差分输入结构 在线监测 电压波形测量 

分 类 号：TM862[电气工程—高电压与绝缘技术]