开断电弧下混合绝缘气体(SF_6+CF_4)分解特性试验研究  

Experimental Study of the Decomposition of SF_6+CF_4 Mixture Under Arcing Conditions

作　　者：马凤翔[1] 于坤[2] 程伟[1] 袁小芳[1] 苏镇西[1] 祁炯[1] 修士新[2] 颜湘莲[3] 

机构地区：[1]国网公司六氟化硫气体特性分析与净化处理技术重点实验室国网安徽省电力公司电力科学研究院,合肥230022 [2]西安交通大学,西安710049 [3]中国电力科学研究院,北京100192

出　　处：《高压电器》2016年第12期116-121,127,共7页High Voltage Apparatus

摘　　要：在高纬度低温地区,由于SF_6气体出现液化,可能导致SF_6开关设备发生绝缘击穿或开断失败等事故,由此该类地区大多采用混合气体(SF_6+CF_4)开关设备。气体分解产物检测是目前设备故障定位和缺陷诊断的重要手段。为此试验以40.5 k V混合气体断路器为试品,开展混合气体(SF_6+CF_4)不同燃弧能量下的气体分解产物试验,通过与纯SF_6气体的比较分析,探讨混合气体(SF_6+CF_4)的分解特性。研究表明:开断电弧下,SF_6+CF_4混合气体的主要分解产物为CO、CO_2、SO_2、SOF_2;分解产物各组分含量均随着燃弧能量的增加而增加;在相同的燃弧能量下,SF_6+CF_4混合气体比纯SF_6气体产生更多的碳氧化合物(CO+CO_2),而硫化物(SOF_2+SO_2)的生产量较少。Liquefaction of SF6 can lead to insulation or interruption failures in switchgear that are installed in high-latitude low-temperature regions. Consequently, SF6＋CF4 mixtures are widely used in gas circuit breakers in these areas. Detection of gas decomposition products is at present an important means for fault locating and diagnosis of defects. A series of SF6＋CF4 mixture decomposition tests were carried out on a 40.5 kV gas-insulated circuit breaker with different arcing energies. The SF6＋CF4 mixture decomposition characteristics were investigated with reference to the performance of pure SF6. It has been found that the decomposition products of SF6＋CF4 mixture in the presence of electric arc are mainly CO, CO2. SO2 and SOF2. The concentration of these decomposed products increases with arc energy. With the same arc energy, SF6＋CF4 mixture produces more carbon oxides（CO＋ CO2） but less sulfides（SOF2＋SO2）, in comparison with pure SF6.

关 键 词：开断电弧 SF6+CF4混合气体 分解产物 气体分析 

分 类 号：TM21[一般工业技术—材料科学与工程]