220 kV交流无间隙金属氧化物避雷器电位分布及改善措施研究  

Study on Potential Distribution and Improvement Measures of MOA for 220 kV AC System

作　　者：万帅 许衡[2] 曹伟[2] 张瑞[2] 郭洁[3] 魏琪 徐迪 余芳[3] WAN Shuai;XU Heng;CAO Wei;ZHANG Rui;GUO Jie;WEI Qi;XU Di;YU Fang(Xiangyang State Grid Composite Insulator Co.,Ltd.,Xiangyang 441057,China;State Grid Electric Power Research Institute,Wuhan 430074,China;School of Electrical Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]襄阳国网合成绝缘子有限责任公司,湖北襄阳441057 [2]国网电力科学研究院武汉南瑞有限责任公司,武汉430074 [3]西安交通大学电气工程学院,西安710049

出　　处：《电瓷避雷器》2019年第4期50-55,共6页Insulators and Surge Arresters

基　　金：国家电网公司科技项目“高梯度氧化锌电阻片配方、工艺及应用技术研究”(编号:SGTYHT/15-JS-193)

摘　　要：杂散电容会使交流无间隙金属氧化物避雷器(metal oxide arresters without gaps,简称MOA)在持续运行时电位分布畸变而不均匀,严重时会导致局部电阻片承受过高的电压负荷,泄漏电流增大而加速老化,进而导致整只避雷器的损坏.因此本文对高压MOA的电位分布和均压措施进行了分类研究.采用ANSYS有限元仿真计算软件,分析了均压环罩入深度、电阻片间金属垫片排布方式和电阻片相对介电常数差异化分布对电位分布的影响.基于电位分布对220 kV MOA的设计结构进行了优化.通过研究,得到了不同结构方式下MOA电位分布的优化效果,对改进MOA的结构设计和提高运行可靠性具有一定的指导意义.In the continuous operation,metal oxide arrester shows uneven potential distribution because of stray capacitance.Some varistors will sustain excessive voltage load and it makes leakage current increase.In a long run,it will lead to aging acceleration and the whole arrester damage.Therefore,several approaches are studied quantificationally to balance the potential.ANSYS finite-element software is adopted to calculate the potential distribution of metal oxide without gaps by changing the depth of the grading ring,the arrangement of the varistors and the relative permittivity of the varistors.By the research,the optimal effect of the potential distribution of the arrester is obtained in three ways,which has certain guiding significance for the structure design of the arrester.

关 键 词：电位分布 均压环 相对介电常数 荷电率 

分 类 号：TM8[电气工程—高电压与绝缘技术]