架空线对GIS变电站VFTO抑制效果的分析  

VFTO inhibitory effect analysis of overhead line in GIS substation

作　　者：周力行[1] 刘家郡[1] 钟笑拳 刘博伟[1] 范彬[1] 朱凌峰[1] 

机构地区：[1]长沙理工大学电气与信息工程学院,湖南长沙410004 [2]国家电网江西省赣西供电公司,江西新余338025

出　　处：《电力科学与技术学报》2015年第1期41-46,共6页Journal of Electric Power Science And Technology

基　　金：湖南省教育厅科学研究重点项目(13A106)

摘　　要：针对GIS变电站开关操作产生快速暂态过电压（VFTO）的抑制问题,基于电磁暂态仿真软件ATP-EMTP搭建的仿真模型,提出采用架空线来连接GIS母线出口套管和主变压器的思路,利用架空线单位长度内几何电感较大,以及考虑架空线产生电晕等影响因素来削弱VFTO的幅值和波头陡度,保护主变压器的安全运行。通过搭建ATP-EMTP仿真模型,分别采用1~45 m架空线连接GIS母线出口套管和主变压器,仿真计算得到入口处的VFTO波形。仿真结果表明：架设20 m左右架空线就能够把变压器入口处的VFTO波头陡度降到允许值范围内,具有一定的工程实用价值。In order to suppress the very fast transient overvoltage （VFTO）caused by switching operation in GIS substation,a simulation model based on electromagnetic transient simulation software ATP-EMTP was built,and a VFTO suppression method which used overhead line to connect GIS output bus bushing and main transformer was also proposed.Owing to the larger ge-ometrical inductance in overhead line per unit length and the corona of overhead line,VFTO am-plitude and wave-head steepness were suppressed,and the safe operation of GIS substation was guaranteed.Simulation results showed that,with about 20 m overhead line,the VFTO wave-head steepness could be suppressed in the allowed range.The suppression method has a great practical application value.

关 键 词：快速暂态过电压 架空线 GIS变电站 电磁暂态仿真 

分 类 号：TM714[电气工程—电力系统及自动化]