SF_(6)替代气体界面绝缘特性的研究进展

Research Advances in Interface Insulation Characteristics of SF_(6) Alternative Gases

由于SF_(6)气体极强的温室效应,以CF_(3)I、C_(4)F_(7)N、C_(5)F_(10)O等气体为代表的环境友好型绝缘气体得到了越来越多关注。沿面绝缘特性是评价气–固复合绝缘系统电气性能的一个重要指标,但目前对于新型环保气体的相关研究尚不完善。为了推进环保型SF_(6)替代气体的研发与应用,综述了几种热门SF_(6)替代气体界面绝缘性能的研究进展。从间隙击穿特性及沿面绝缘特性、气–固界面电荷积聚特性和气体分解与气–固材料相容性对沿面绝缘特性的影响3个方面入手,讨论了SF_(6)替代气体进行工程应用的可能性。最后提出SF_(6)替代气体界面绝缘特性研究的3个方向:一是注意电压频率对新型环保气体中沿面放电的影响;二是探究新型环保气体中长期电–热–机复合应力下电荷积聚对沿面绝缘性能的影响机制;三是基于气体分解特性与气–固材料相容性对沿面绝缘性能的影响机制,对新型环保气体气–固复合绝缘系统进行优化设计。

Due to the serious greenhouse effect of SF_(6),eco-friendly insulating gases represented by CF_(3)I,C_(4)F_(7)N、C_(5)F_(10)O and other gases have attracted more and more attention.The surface insulation characteristic is an important index to evaluate the electrical performance of the gas-solid composite insulation system,but the current research on new eco-friendly gases is not complete.In order to promote the development and application of new eco-friendly gases,this article reviews the research progress of several popular SF_(6) alternative gases on the interface insulation properties.From three aspects,such as the gap breakdown characteristics and surface insulation characteristics,gas-solid interface charge accumulation characteristics,and the influence of gas decomposition and gas-solid compatibility on the surface insulation characteristics,the possibility of SF_(6) alternative gases for engineering applications is discussed.Finally,three directions for the investigation of SF_(6) alternative gases on the interface insulation characteristics are proposed as follows:first,the influence of frequency on creeping discharge in new eco-friendly gases should be focused on;second,the effect of charge accumulation on creeping insulation under long-term electric-thermal-mechanical compound stress in new eco-friendly gases should be investigated;third,the design of the new eco-friendly gas-solid composite insulation system should be optimized based on the influence mechanism of gas decomposition characteristics and gas-solid compatibility on the surface insulation performance.