基于ANSYS分析的典型500kV电流互感器电场分布计算

叙述了如何通过ANSYS分析计算典型500 kV电流互感器电场分布的方法,并得出典型500 kV电流互感器的电场分布。计算结果表明,接地屏蔽管与SF6气体间隙分界面、一次绕组与SF6气体间隙分界面、悬浮电位和高压电位屏蔽罩表面与SF6气体间隙分界面均是最大电场强度较大的区域,最大电场强度分别达到7.85kV/mm、6.57 kV/mm和5.81 kV/mm,相对来说更容易称为气体绝缘的薄弱部位。在这些区域如果出现金属突出物、金属碎屑等物质时容易导致严重的电场畸变,从而造成严重的安全隐患。在涉及500 kV典型电流互感器的故障模拟试验中,可以针对这些薄弱环节进行故障模拟试验。

Calculation on Electric Field Distribution of Typical 500 kV Current Transformer Based on ANSYS Analysis

This paper describes method how to analyze and calculate electric field distribution of typical 500 kV current trans- former by using ANSYS and gains a result. The calculation result indicates that the interface between grounding screen tube and SF6 gas gap, the interface between primary winding and SF6 gas gap and the interface between screen tubes of suspended potential and high voltage potential and SF6 gas gap are major areas of maximum electric field intensity. The maximum elec- tric field intensity is respectively reaching to 7. 85 kV/mm, 6. 57 kV/mm and 5. 81 kV/mm which comparatively means weak part for gas insulation. If there are some substances such as metal protrusions and fragments in these areas, it is easy to cause serious electric field distortion which may result in serious potential safety hazard. In fault simulation testing for 500 kV typical current transformer, it is suggested to proceed fault simulation testin~ for these weak links.