750kVGIS中金属氧化物避雷器对VFTO影响的研究  

Research on the Influence of Operation Modes to VFTO in 750 kV GIS

作　　者：余芳[1] 金青[2] 郭洁[1] 赵珊 

机构地区：[1]西安交通大学电气工程学院高压教研室,西安710049 [2]西安电力高等专科学校,西安710032 [3]延安供电局,陕西延安716000

出　　处：《电瓷避雷器》2009年第3期31-33,38,共4页Insulators and Surge Arresters

基　　金：国家自然科学基金(编号:50577051)

摘　　要：随着超高压气体绝缘变电站(GIS)的广泛使用,由隔离开关(DS)和断路器(CB)操作引起的快速暂态过电压(VFTO)的危害越加明显。以西北地区750 kV官亭GIS变电站为计算原型,利用电磁暂态程序(EMTP)对不同运行方式下GIS设备上的VFTO进行数值仿真计算和分析。重点在于对不同运行方式下金属氧化物避雷器(MOA)的限制过电压效果进行分析。计算结果表明:DS无分合闸电阻时,MOA防护效果更明显;MOA主要的抑制效果体现在MOA附近的设备上,对于远离MOA的设备上的VFTO的抑制效果较小;由于VFTO持续的时间极短,通过MOA的能量很小。With the wide use of the ultra-high voltage gas-insulated substation （GIS）, hazards of VFTO caused by disconnectors （DS） and circuit breakers （CB） operation become moreand more obvious. Taking the Northwest China Guanting 750kV GIS substation as prototype, numerical simulation and analysis was carried out on VFTO at the GIS under different operating mode using electromagnetic transient program （EMTP）, focusing on analysis of effects of over-voltage limiting of metal oxide arrester （MOA） under different operating modes. The results show that： protective effect of MOA was more obvious when DS has not switching resistance; effect of MOA embodied on the devices near MOA, the inhibitory effect was smaller for VFTO on the equipment apart from the MOA; because of the VFFO duration is very short and very little energy through the MOA.

关 键 词：气体绝缘变电站 快速暂态过电压 隔离开关 断路器 电磁暂态程序 金属氧化 物避雷器 

分 类 号：TM864[电气工程—高电压与绝缘技术]