SF_6气体及其衍生物的红外光谱分析

SF6气体大量应用于气体绝缘组合电器(GIS)中。通过化学方法检测SF6气体及其衍生物是检测GIS设备故障的一种重要方法。该文采用红外光谱技术分析了三种情况下的GIS设备内SF6气体组成情况,得出S2F10气体含量可以用来分析GIS故障原因是否为强火花或者电弧放电引起;CF4气体可以用来表征GIS设备内绝缘气体的绝缘状态。另外,研究表明,GIS设备在线运行时,绝缘气体气室密封失效、造成气体泄漏,引入新的气体杂质的问题比较严重。所以在进行GIS设备维护工作时,绝缘气室的密封维护工作十分重要。文章在研究GIS设备绝缘气体SF6红外谱图的基础之上提出了建立基于红外光谱技术的GIS设备故障诊断专家系统的意见。

Infrared spectrum analysis of SF6 and SF6 decomposition

Pressured SF6 gas is widely used in GIS for electrical insulation as well as for are extinction. And a chemical way for detecting the SF6 and its byproducts is a powerful diagnosis method for GIS. The present paper analyzes the decomposition of insulated gas of GIS (mostly SF6) in three cases with infrared spectrometer. As a result, it was found that the content of S2F10 can be used to decide whether spark or arc discharge leads to the fall down of GIS; CF4 can be used for judging the insulation grade of GIS. Besides, the gas leakage of the GIS should be concerned in the long lifetime of GIS. Finally, it is supposed that a data base containing the history of results from the gas diagnostics for each piece of equipment should be created for future maintenance activities.