H2O对尖端放电缺陷下SF6分解产物含量的影响

Effect of H2O on the Content of SF6 Decomposition Products under Point Discharge

为了研究现场工况GIS(气体绝缘金属封闭开关)运行过程中水分对尖端放电缺陷下SF6气体分解产物的影响,在252 k V真型GIS故障仿真实验平台基础上构建了SF6气体分解产物检测系统,通过短时连续局部放电实验,得到GIS腔室内部在尖端放电缺陷下CO,CO2,CF4,C2F6等SF6分解产物随微水含量的变化规律。结果表明:在现场工况尖端放电缺陷短时连续监测下,随着放电时间的增加,在高微水情况下φ(CO2)明显高于低微水情况,而φ(C2F6)受水分影响较小,整体增加范围在700×10-6~1000×10-6,可以用这2种产物来表征GIS内部尖端放电缺陷的产生;φ(CO)与φ(CF4)在不同微水含量条件下,随放电时间的增加波动较大,并无明显变化规律,可以作为尖端放电缺陷的辅助判据。

To study the effect of moisture on SF6 decomposition products in the operation of GIS in field operating condition,an SF6 decomposition products detection system was constructed on 252 k V GIS fault simulation and experiment platform.Through short-term continuous partial discharge,it is concluded that SF6decomposition products such as CO,CO2,CF4 and C2F6 vary with micro-water under point discharge in GIS chamber.The result shows that under the short-term continuous monitoring of the point discharge defects,φ(CO2)of high micro-water is more than that of low water content with the increase of discharge time whileφ(C2F6)is less affected by moisture,and the overall increase range is 700×10-6~1000×10-6.These two products can characterize the generation of point discharge defects in GIS;under different micro-water contents,φ(CO)andφ(CF4)fluctuate greatly with discharge time increase,and there is no obvious rule,which can be used as auxiliary judging criteria for point discharge defects.