模拟电气设备过热故障时SF_6气体分解产物的体积分数及其特征  

Analyzing Decomposition Products in Overheat Faults Simulation to Evaluate SF_6 Gas Insulation Device

作　　者：王宇[1] 李丽[1] 姚唯建[1] 庄贤盛[1] 黄成吉[1] 

机构地区：[1]广东电网公司电力科学研究院,广州510080

出　　处：《高压电器》2011年第1期62-69,共8页High Voltage Apparatus

摘　　要：对于运行中的电气设备,判断其设备内部运行状态相对困难,通过分析检测SF6气体的分解产物是判断SF6气体绝缘设备内部运行情况的一个强有力手段。笔者模拟了SF6电气设备不同温度和湿度的过热情况下所产生的分解产物类型及其体积分数,为确定电气设备故障类型提供数据支持。通过模拟试验得出,SF6在350℃时即开始产生较显著的分解产物,在高湿度环境下比在低湿度环境下更容易分解,且分解产物SO2、H2S和HF的体积分数更大。设备中的高水分含量会加速SF6的分解,为了确保电气设备的安全运行,必须严格控制设备内部气体的水分体积分数。SF6分解会产生HF,其具有强腐蚀性,当HF增长到一定体积分数后,会腐蚀设备内部,从而造成HF体积分数下降。是否含有S2OF10对SF6分解产物及其体积分数的影响并不显著。For safety evaluation of an SF6 gas insulation device in operation, it is very effective to detect the decomposition products of SF6. The authors detected the decomposition products and their concentrations in an SF6 gas insulation device under simulated overheat conditions with different temperature and humidity to offer a support to diagnosis of electric equipment. The simulation results showed that SF6 was clearly decomposed at 350℃. The higher the humidity was, the higher the concentrations of such decomposition products as SO2, HES, and HF were. Moisture in this type of electric equipment accelerates the decomposition of SF6,therefore moisture must be strictly controlled in order to ensure the safe operation of the equipment. HF will erode equipment when its concentration is over a certain value, while the effect of S2OF10 on SF6 decomposition is not significant.

关 键 词：六氟化硫 过热故障 分解产物 二氧化硫 硫化氢 氟化氢 

分 类 号：TM507[电气工程—电器]