隔离开关不同操作方式产生的快速暂态过电压  

Very Fast Transient Overvoltage Caused by Different Switching Modes of Disconnector

作　　者：刘青[1] 

机构地区：[1]西安科技大学电气与控制工程学院,西安710054

出　　处：《高压电器》2011年第4期17-22,共6页High Voltage Apparatus

基　　金：陕西省教育厅科研计划资助项目(项目批准号09JK578)~~

摘　　要：超高压GIS内开关操作引起的快速暂态过电压严重威胁了电力系统运行的安全性。笔者针对某550 kVGIS,建立了仿真模型并确定了相关参数,研究了多种运行方式、隔离开关不同操作条件下GIS内部各节点的快速暂态过电压,得到了操作顺序对过电压的影响规律,同时分析了隔离开关并联电阻对快速暂态过电压的抑制作用。结果表明,隔离开关分闸操作产生的过电压幅值远大于其合闸操作产生的过电压;切换母线操作产生的过电压较严重;被操作开关处的VFTO受操作方式影响最大;隔离开关并联电阻加速了过电压的衰减抑制效果明显,但GIS整体成本增加,电阻值大于200Ω时VFTO幅值小于1.6 p.u.。Operating experiences have shown that the very fast transient overvoltage（VFTO） caused by switching operations in extra high voltage gas insulated substation（GIS） threatens the security of power system.For a 550 kV GIS,the model has been built up and the parameters have been selected in this paper.Taking different operating modes into consideration,the magnitudes and frequency spectrum of VFTO along GIS nodes have been calculated by using EMTP.The relationships between switching modes and VFTO have been founded.The protective effect on VFTO of parallel resistor has also been studied.It is shown that the VFTO caused by opening operations are even higher than those caused by closing operations.Switching conditions and operating modes would exert an influence on VFTO,even for the node of the switches operated.The VFTO caused by switching one bus to the other is the most severe.Parallel resistors could accelerate the attenuation of overvoltages,the magnitudes of which will be less than 1.6p.u.,when the resistance is more than 200 Ω.

关 键 词：气体绝缘变电站 快速暂态过电压 操作方式 并联电阻 

分 类 号：TM864[电气工程—高电压与绝缘技术]