GIS用盆式绝缘子电场分布与绝缘性间关系研究  

Relationship between Electric Field Distribution and Insulation Performance of Basin insulator for GIS

作　　者：张施令[1] 姚强[1] 苗玉龙[1] 李龙[1] 

机构地区：[1]重庆市电力公司电力科学研究院,重庆401123

出　　处：《电瓷避雷器》2017年第6期209-215,共7页Insulators and Surge Arresters

摘　　要：盆式绝缘子是GIS设备较为重要的绝缘件,在实际运行中,其绝缘性能与电场分布关系密切。从一起盆式绝缘子事故分析入手,对盆子烧蚀产物和故障气体进行成分分析。分析结果表明:盆子局部高场强导致电弧闪络产生大电流,从而引起盆子表面烧蚀和SF6气体成分变化。基于此,通过理论解析方法从金属屑、金属突出物和绝缘介质内部存在气泡3种绝缘缺陷对局部高场强进行理论解释,并得到其局部场强增强系数。随后建立盆式绝缘子三维电场仿真计算模型,得到其电场分布规律,发现盆式绝缘子表面场强分布不均匀,易在中心导体附近形成局部场强集中,应在设计中加强对该区域的屏蔽措施。本文的研究成果对盆式绝缘子的绝缘结构设计以及GIS设备的现场监测和维护具有一定的理论和指导意义。Basin insulator is very important insulating part in GIS. In actual operation, the insula- tion performance of basin insulator is closely related to the electric field distribution. Based on the analy- sis of the accident of basin insulator, the component analysis of the ablation products and fault gas has been done. The analysis results show that the local high electric field leads to the flashover large current, the high temperature caused the ablation of the basin insulator surface and SF6 gas composition. Based on this, through the theoretical analysis method, the theoretical explanation of the local high electric field strength is explained from three kinds of defects which are the metal chips, metal protrusion and air bubbles inside the insulating medium, and the local field strength enhancement factor has been got. Then the three-dimensional electric field simulation model of the GIS spacer has been built, the electric field distribution law has been got. It is found that the surface field strength distribution of the basin insulator is not uniform. The local field intensity concentration is easy to form near the center conductor. The shielding measures should be strengthened in the basin insulator design. The research results of this pa- per have certain theoretical and guiding significance for the insulation structure design of the GIS spacer and the field monitoring and maintenance of the GIS equipment.

关 键 词：盆式绝缘子 故障气体 绝缘缺陷 电场仿真 

分 类 号：TM216[一般工业技术—材料科学与工程]