镀锌层对新型固体绝缘结构电场分布影响的研究

Research on the Effect of Zinc Coating on Electric Field Distribution of New Solid Insulation Structure

近年来,12k V固体绝缘环网柜在配电系统中得到了大力推广。为了实现可靠接地,在绝缘件的表面镀锌并可靠接地,发现绝缘件的电场分布发生较大改变。为了研究镀锌层对固体绝缘结构电场分布的影响,本文以12k V固体绝缘环网柜内的绝缘筒为例,采用有限元法对其进行仿真,分别对外表面有无镀锌层的绝缘筒的电场分布进行分析。结果表明:无镀锌层的绝缘筒的最大场强值低于临界击穿场强,不会发生击穿;有镀锌层的绝缘筒的最大场强值较无镀锌层的大一个数量级,若绝缘材料存在缺陷或结构设计不合理,则会发生局部放电。

In recent years, the 12kV solid-insulated ring main units has been vigorously promoted in the distribution system. In order to achieve reliable grounding, zinc plated on the surface of insulation and reliable grounding, it is found that the electric field distribution of insulator is changed greatly. In order to study the effect of zinc coating on the electric field distribution of solid insulation structure, this paper takes the 12kV solid-insulated ring main units as an example, and using the finite element method to simulate. Then analysis of the electric field distribution of the insulation cylinder when the surface is coated with zinc or not. Results show： The maximum electric field strength of the insulation cylinder without zinc coating is lower than that of the critical breakdown field strength, no breakdown; The maximum electric field strength of the insulation cylinder with zinc coating is larger than without zinc coating. If the insulation material has the defect or the structure design is not reasonable, there may occur the partial discharge.