环氧树脂对SF6过热分解组分浓度变化的影响

Effect of Epoxy Resin on Concentration of Thermal Decomposition Components of SF6

为了提高基于SF6分解组分浓度的SF6气体绝缘装备运行状态评估方法的准确性,从CO2、SO2、H2S、SOF2、SO2F2、CF4、CS27种特征气体浓度变化出发研究了环氧树脂对SF6过热分解组分浓度变化的影响规律。结果表明:仿真显示纯环氧树脂过热分解会生成少量的H2O、CO2等小分子。实验发现,在300~450℃,CO2、SO2、H2S、SOF2的生成速率急剧上升,SO2F2、CF4、CS2的生成速率相对较慢;与只加热SF6相比,当环氧树脂存在时SF6分解组分中H2S的起始生成温度大幅降低。当CO2浓度达到SO2和H2S浓度之和的5倍,且H2S的浓度高于0.5×10-6时,电气设备中发生了涉及环氧树脂绝缘材料早期过热分解的故障。

In order to improve the accuracy of operation state assessment method based on the concentration of SF6 decomposition components for SF6 gas insulation equipment,we studied the effect of epoxy resin on the concentration variation of thermal decomposition components of SF6,which included CO2,SO2,H2S,SOF2,SO2F2,CF4,and CS2.The simulation results show that small amount of H2O and CO2 micromolecule generates from the thermal decomposition of pure epoxy resin.The experiment results show that at 300-450℃,the generation rate of CO2,SO2,H2S,and SOF2 increases drastically,while the generation rate of SO2F2,CF4,and CS2 is relatively slow.Compared with heating experiment of pure SF6,the initial generation temperature of H2S decreases significantly in the presence of epoxy resin.When the concentration of CO2 reaches five times as big as the sum of concentration of SO2 and H2S,and the concentration of H2S is higher than 0.5×10-6,it can be judged that there are faults refer to early decomposition of epoxy resin in the electrical equipment.