直流电压下GIS盆式绝缘子表面电荷及电场分布特性仿真研究  

Simulation Study on Surface Charge and Electric Field Distribution Characteristics of GIS Insulating Spacer Under DC Voltage

作　　者：罗传仙[1] 邱虎 孙亚辉 文豪 程立丰 罗子秋 张晓星 郭世瑞 LUO Chuanxian;QIU Hu;SUN Yahui;WEN Hao;CHENG Lifeng;LUO Ziqiu;ZHANG Xiaoxing;GUO Shirui(State Grid Electric Power Research Institute Wuhan Nanrui Co.,Ltd.,Wuhan 430074,China;EHV Branch Company,State Grid Fujian Electric Power Co.,Ltd.,Fuzhou 350013,China;Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment,Hubei University of Technology,Wuhan 430068,China)

机构地区：[1]国网电力科学研究院武汉南瑞有限责任公司,武汉430074 [2]国网福建省电力有限公司超高压分公司,福州350013 [3]湖北工业大学新能源及电网装备安全监测湖北省工程研究中心,武汉430068

出　　处：《高压电器》2024年第3期101-110,共10页High Voltage Apparatus

基　　金：国家电网公司总部科技项目(5500-202147110A-0-0-00)。

摘　　要：GIS中盆式绝缘子表面在外施直流电压时会积聚大量电荷使得沿面闪络电压大幅降低,从而引发一系列电气设备故障。基于上述问题,文中分析了盆式绝缘子表面电荷的来源与传导途径,采用有限元仿真计算方法构建了二维轴对称仿真模型以及设定相关参数,研究了电压极性、不同电压幅值以及电压极性反转对盆式绝缘子表面电荷分布的影响。结果表明,在直流电压下,凹面主要积聚与外施直流电压极性相反的电荷,凸面主要积聚与直流电压极性相同的电荷,且凹面积聚的电荷密度更大;在极性反转后-100 kV直流电压下,盆式绝缘子表面原先积聚的电荷密度呈现先增大后逐渐减小的趋势,随后转换极性并达到饱和,电场在靠近高压端以及盆式绝缘子沿面0~20 mm处的畸变程度较为明显。电场在盆式绝缘子表面电荷极性发生变化前出现峰值,相比较电荷达到饱和状态,此时盆式绝缘子凹面最大场强增加46%,凸面最大场强增加5.4%。该研究可为直流电压下盆式绝缘子表面电荷分布特性提供指导。In case of applying DC voltage,a large amount of charge will accumulate on the insulating spacer of gas insulated switchgear(GIS),which will greatly reduce the flashover voltage along the surface,resulting in a series of faults of electrical equipment.Based on the above problems,the source and conduction path of the insulating spacer surface charge is analyzed in this paper,the two-dimensional axisymmetric simulation model is constructed and the relevant parameters are set by using finite element simulation calculation method,and the influence of volt-age polarity,different voltage amplitudes and voltage polarity reversal on the distribution of insulating spacer sur-face charge is studied.The results show that under DC voltage,the charge which is oppotite to the applied DC volt-age polarity is mainly accumulated in the concave side and the charge which is identical to the DC voltage polarity is mainly accumulated in the convex side and the charge density accumulated on the concave side is larger.In case of DC voltage at-100 kV after polarity reversal,the charge density originally accumulated on the surface of the in-sulating spacer shows a trend of increasing firstly and then decreasing gradually,and then the polarity is converted to reach saturation.The distortion degree of the electric field near the high voltage end and from 0-20 mm along the surface of the insualting spacer is obvious.The peak value of the electric field appears before variation of the surface charge polarity of the insualting spacer.Compared with the saturated state of the charge,the maximum field strength of the concave side of the insulating spacer is increased by 46%,and that of the convex side by 5.4%.This study can provide guidance for the distribution of the surface charge of the insulating spacer under DC voltage.

关 键 词：表面电荷分布 盆式绝缘子 直流GIS 电荷积聚 

分 类 号：TM216[一般工业技术—材料科学与工程]