SF_6在故障温度为300～400℃时的分解特性研究  

Decomposition Characteristic Study of SF_6 With Fault Temperature Between 300～400℃

作　　者：唐炬[1] 潘建宇[1] 姚强 苗玉龙 曾福平[1] 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),沙坪坝区重庆市400044 [2]重庆电力公司电力科学研究院,渝北区重庆市401123

出　　处：《中国电机工程学报》2013年第31期202-210,25,共9页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2009CB724506);国家自然科学基金项目(5177181);中央高校基本科研业务费专项资金(CDJXS12150001)~~

摘　　要：为了探索SF6绝缘气体在过热故障状态下的分解特性及其分解机制,完善利用SF6分解特性辨识SF6电气设备绝缘故障的方法,该文利用研制的SF6电气设备过热性故障模拟装置进行了系列探索性实验,对SF6过热分解组分采用气相色谱法(gas chromatograph,GC)和气相色谱质谱联用法(gas chromatography-mass spectrometry,GC-MS)进行定量检测,初步得到SF6在400℃以下的过热分解特性。在此基础上探索SF6的初始分解温度,研究了分解产物组成类型和不同温度下各自的形成规律,并选定了SF6在过热状态分解时所形成的主要特征分解组分,构建了特征分解组分与温度之间的关联图谱。结果表明:SF6大约在300℃时开始出现比较明显的分解,其主要分解产物有CO2、SO2F2、SOF2、SOF4、SO2、H2S,但不含CF4;温度的升高将加剧SF6气体的分解,促进各分解组分的形成,但对各分解产物的促进程度却因组分种类的不同而规律各异;SOF2和SO2是SF6在过热故障温度为300～400℃时的最主要分解特征产物,二者的产气速率图谱可有效表征SF6电气设备过热故障点处的温度,为下一步诊断SF6电气设备过热故障提供参考。To find out SF6 decomposition characteristic under fault temperature and optimize the method of using the decomposed components of SF6 to indentify electrical faults, this paper exploited the SF6 thermal decomposition model to conduct serials of experiments. Decomposed components were measured using gas chromatograph （GC） and chromatography-mass spectrometry （GC-MS） and the thermal decomposition characteristic was achieved under 400 ℃. Based on the measuring data, the paper firstly revealed the SF6 thermal decomposition initial temperature. Then it found out the types of thermal decomposed components and analyzed their formation regularity under different fault temperatures. Besides, it clarified the most stable characteristic components and used them to establish the relation picture between fault temperature and their formation rate. The results show that： SF6 begins to decompose at 300 ℃ and contains 02, SO2F2, SOF2, SOF4, SO2 and H2S, but no CF4; the improvement of fault temperature will promote the formation of decomposed components, but the influence regularity of each component is different; SOF2 and SO2 are the most stable characteristic components and their formation rate can be precise indicator of SF6 fault temperature.

关 键 词：六氟化硫 过热性故障 分解规律 稳定特征产物 关联图谱 

分 类 号：TM835[电气工程—高电压与绝缘技术]