基于表层电导率迭代优化的绝缘子沿面电场分布调控  

Electric Field Distribution Control Along Spacer Surface Based on Iterative Optimization of Surface Conductivity

作　　者：李宾宾 黄杰 罗沙 薛建议 张竹 丁立健 LI Binbin;HUANG Jie;LUO Sha;XUE Jianyi;ZHANG Zhu;DING Lijian(Electric Power Research Institute of State Grid Anhui Electric Power Co.,Ltd.,Hefei230601,China;School of Electrical Engineering and Automation,Hefei University of Technology,Hefei230009,China)

机构地区：[1]国网安徽省电力有限公司电力科学研究院,合肥230601 [2]合肥工业大学电气与自动化工程学院,合肥230009

出　　处：《高压电器》2023年第9期98-105,共8页High Voltage Apparatus

基　　金：国家电网公司安徽省电力有限公司科技项目(SGAHDK00FZJS2310219);国家自然科学基金项目(52107143)。

摘　　要：气固界面电场畸变是诱发绝缘子沿面放电和降低其沿面耐电性能的重要原因,研究直流GIL绝缘子沿面电场分布调控对于提升绝缘子运行的可靠性具有重要意义。直流电压下,绝缘子沿面电场分布由其电导率分布所决定,合理地优化绝缘子表层电导率分布可以达到调控气固界面电场分布的目的。文中利用高电导涂层方法改变绝缘子表层电导率,类比现有的体介电常数优化算法,以沿面电场均匀度为优化目标,开发了表层电导率迭代优化算法,研究了迭代优化次数、涂层层数和厚度对优化后涂层电导率分布和涂层绝缘子沿面电场分布的影响。迭代优化后结果表明,迭代优化次数的增加会使得优化后的涂层电导率和涂层绝缘子沿面电场分布均匀程度增加。随涂层层数N增加,沿面电场强度先快速降低(N≤40)而后趋于饱和(N>40),当涂层层数为100层时,沿面最大电场强度相比无涂层绝缘子降低20.32%(迭代3次,涂层厚度为1.0 mm)。随涂层厚度d的增加,沿面最大电场强度先快速降低(d≤0.4 mm)而后趋于饱和(d>0.4 mm),最优的涂层厚度为0.4 mm,此时沿面最大电场强度相比无涂层绝缘子降低约20%。The electric field distortion at gas-solid interface is an important reason for inducing surface discharge of spacer and reducing its electric resistance performance along the surface.It is of great significance to study the surface electric field distribution control of spacer of DC GIL to improve the operation reliability of the spacer.Under DC voltage,the electric field distribution along the spacer surface is determined by its conductivity distribution.Reasonable optimization of the spacer surface conductivity distribution can achieve the goal of controlling the electric field distribution at the gas-solid interface.In this paper,the high conductive coating method is used to change the conductivity of spacer surface.An iterative optimization algorithm for surface conductivity is developed by way of simulating the existing volumetric dielectric constant optimization algorithm and of taking the uniformity of electric field along the surface as the target.Moreover,the influence of the iterative optimization numbers,number of coating layers and thickness on the coating conductivity distribution and electric field distribution of the coating spacer along the surface after the iterative optimization is studied.The result after the iterative optimization shows that the increase in the number of iterative optimization will increase the conductivity and the uniformity of the surface electric field distribution of the coated spacer.With the increase in the numbers of coating layers N,the surface electric field strength decreases rapidly(N≤40)and then tends to be saturated(N>40).When the number of coating layers is 100,the maximum electric field strength along the surface decreases by 20.32%compared with that of uncoated spacers(with iteration 3 times and coating thickness is 1.0 mm).With the increase of coating thickness d,the maximum surface electric field strength rapidly decreases(d≤0.4 mm)and then tends to be saturated(d>0.4 mm).The optimal coating thickness is 0.4 mm.At this time,the maximum surface electric f

关 键 词：直流GIL 电导率 电场分布 迭代优化 

分 类 号：TM216[一般工业技术—材料科学与工程]