环保气体开关柜中复合绝缘结构绝缘特性

Insulation Characteristics of Compound Insulation in Environmental Gas Switch Cabinet

环保型气体绝缘开关柜若要保持尺寸小巧紧凑的特点,需要引入固体绝缘技术,研究气固复合绝技术并掌握其绝缘特性。基于电场仿真和试验对12~24 kV环保开关柜中存在的几种典型复合绝缘结构进行了研究。通过理论计算及电场仿真得出:在相同绝缘结构下,高压带电体上添加固体绝缘材料后,气隙内最大电场强度可降低约20%,提升绝缘性能;通过试验得出在高低压电极之间合适位置添加绝缘板屏障,能提升绝缘性能2~3倍;通过合理设计固体绝缘件外形及添加屏蔽能大幅度减少固体绝缘件表面电场强度,降低沿面放电发生的几率。通过分析研究,得出了提高气体固体复合绝缘结构的耐压强度的优化方法,为尺寸紧凑且高绝缘性能的环保气体绝缘开关柜及其他应用复合绝缘结构的高压电器的研发提供设计参考。

In order to maintain the small and compact features of environmental gas insulated switch cabinet,it is necessary to introduce solid insulation technology and research gas solid composite insulation technology. Based on electric field simulation and theoretical calculation,the composite insulation of 12 ～ 24 kV environmental switch cabinet was studied. Through theoretical calculation and electric field simulation,it was concluded that under the same insulating structure,the maximum electric field strength can be reduced by about 20% in the air gap after the solid insulation material was added to the high voltage charged body. Through insulation test,it was concluded that the insulation can be increased by 2 ～ 3 times by setting up insulation barriers between high and low voltage electrodes. By reasonably designing the shape of solid insulator and adding shielding,it can greatly reduce the electric field intensity of the solid insulator surface and reduce the probability of surface discharge occurrence. Through analysis and research,the optimal method was obtained for enhancing the insulation strength of the gas solid composite insulation. It provided reference for the research and development of compact size and excellent insulation environmental gas switch cabinet and other high-voltage appliances.