SF_6局部过热分解特征组分的微量O_2作用机制  

Action Mechanism of Trace O_2 on Characteristic Components of SF_6 Thermal Decomposition

作　　者：程林[1,2] 彭非[1,2] 唐炬[3] 王立强[3] 姚强[4] 曾福平[3] 

机构地区：[1]国网电力科学研究院武汉南瑞有限责任公司,武汉430074 [2]华中科技大学电气与电子工程学院,武汉430074 [3]武汉大学电气工程学院,武汉430072 [4]重庆市电力公司电力科学研究院,重庆401123

出　　处：《高电压技术》2015年第12期4105-4112,共8页High Voltage Engineering

基　　金：国家自然科学基金(51537009);湖北省自然科学基金(2015CFB165)~~

摘　　要：在局部过热故障下,微量O_2直接参与SF6的分解过程,在利用特征组分诊断SF6气体绝缘设备过热性故障时必须考虑O_2的影响。为此,在已有的SF6局部过热分解模拟实验平台上,通过控制纯净SF6气体中的微量O_2体积分数进行SF6过热分解实验,得到了不同微量O_2体积分数对SF6主要过热分解特征产物的影响规律。研究表明:SOF4和SO_2F2的产气量均与O_2体积分数正相关,微量O_2可将SOF4转化为SO_2F2,使SO_2F2的产气量随着O_2体积分数的增加而呈指数增长。微量O_2与SF6初级分解产物的直接反应使得SO_2成为主要产物,F原子和O原子竞争中间分解产物,导致SO_2饱和,而SOF2的绝对产气量则出现先增后减的情况。微量O_2不仅影响了各分解产物的产气量,也使得SO_2和SO_2F2演变为SF6过热分解的主要产物,且微量O_2对SO_2F2的促进作用更显著。With fault of partial overheating, trace O2 participates in SF6 decomposition process directly. When SF6 cha- racteristic components are used to diagnose thermal fault of SF6 gas-insulated equipment, we must take the effect of trace O2 into account. Therefore, a series of thermal decomposition experiments through controlling the content of trace O2 in pure SF6 were conducted on the existing simulation system. Influences of trace O2 on the formation of the main characte- ristic components of SF6 thermal decomposition were achieved. It is found that the SOF4 and SO2F2 increase with the increase of O2. SOF4 can be converted into SOaF2 and trace O2, which increase the products SOEF2 exponentially with trace O2. The reaction between trace O2 and primary products of SF6 thermal decomposition makes SO2 to be the major product. However, the F atoms and O atoms compete the intermediate decomposition products, which ensure SO2 to reach saturation, and the absolute yield of SOF2 first increases and then decreases. The results show that the characteristic components of SF6 thermal decomposition are influenced by trace O2 specially for SO2F2, and the products SO2 and SO2F2 are found to be main comoonents.

关 键 词：六氟化硫 局部过热性故障 过热分解 微量氧气 变化规律 特征产物 

分 类 号：TM595[电气工程—电器]