考虑GIS外壳传输特性的VFTO计算模型  

Calculation Model of VFTO Considering Transmitting Characteristics of GIS Enclosure

作　　者：林莘[1] 李爽[1] 徐建源[1] 李胜辉[1] 

机构地区：[1]沈阳工业大学电气工程学院,辽宁省沈阳市110078

出　　处：《电网技术》2010年第11期203-207,共5页Power System Technology

基　　金：高等学校科技创新工程重大项目培育资金项目(707018);高等学校博士学科点专项科研基金项目(20092102110001)~~

摘　　要：在计算快速暂态过电压(very fast transient overvoltage,VFTO)时,全封闭式组合电器(gas insulatedswitchgear,GIS)暂态电路的准确搭建直接影响VFTO的计算准确度。结合中国某1100kVGIS变电站,根据多导体传输线理论和相模变换方法,建立了GIS外壳传输特性模型,并与GIS内部暂态模型相结合,详细计算了隔离开关操作时所产生的VFTO,分析了GIS内部关键设备处VFTO的极值、频谱特性及上升率。最后研究了未操作相母线上残余电压对操作相VFTO的影响。研究结果可供GIS设计及连接在GIS上的电气设备绝缘结构设计参考。The exact transient circuit model of gas insulated switchgear （GIS） can directly affect the accuracy of very fast transient overvoltage （VFTO） results in case of calculation. Taking a 1 100 kV GIS substation in China as example, a model symbolizing the transmitting characteristics of GIS enclosure is formed on the basis of theory of multi-conductor transmission lines and phase-model transformation method. By combining above model with the internal transient circuit model of GIS, the VFTO produced by operation of disconnector is calculated and analyzed in details such as the maximum value, spectrum characteristics and rising rate of VFTO on the principal devices inside GIS. Besides, the effect of residual voltage on unoperated phase bus on VFTO of operated phase is also discussed. The calculation and research results could be used as reference for electrical design of GIS and those electric devices connected with it.

关 键 词：全封闭式组合电器 外壳传输特性 快速暂态过电压 隔离开关 残余电压 

分 类 号：TM46[电气工程—电器] TM862