2.5MV特快速瞬态过电压发生器  

Research and Design of the 2.5 MV Very Fast Transient Overvoltage Generator

作　　者：殷禹[1] 刘石[2] 时卫东[1] 王绍武[3] 张璐[2] 李龙[2] 张翠霞[1] 张乔根[2] 赵文强 武可 

机构地区：[1]中国电力科学研究院,北京市海淀区100192 [2]电力设备电气绝缘国家重点实验室(西安交通大学),陕西省西安市710049 [3]国家电网公司,北京市西城区100031 [4]河南平高电气股份有限公司,河南省平顶山市467001

出　　处：《中国电机工程学报》2011年第31期48-55,共8页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2011CB209405);国家电网公司科技项目(SGKJJSKF[2009]776)~~

摘　　要：气体绝缘开关设备(gas insulated switchgear,GIS)以其占地面积少、密封性好,受环境影响小,运行可靠、维修周期长等优点在中国电网中得到了广泛应用。在330kV以上电压等级的系统中,开关动作产生的特快速瞬态过电压(very fast transient overvoltage,VFTO)对系统有很大危害。为满足特高压GIS中VFTO的模拟,利用6MV敞开式冲击电压发生器与陡化装置结合的方法,研制出一种模拟VFTO产生的装置。通过增加GIS母线长度来补偿回路固有电感的影响,以及通过控制陡化间隙的击穿电压来控制输出电压幅值,使该装置可以输出幅值为2.5MV、高频振荡达到35 MHz的电压波,能够满足特高压试验对VFTO模拟的要求。采用外加积分器方式,制作了一种锥形电容传感器来测量该装置产生的电压波,测试结果表明该电容传感器可以满足试验的要求。Gas insulated switchgear（GIS） has a wide range of acceptance in power systems due to its good compactness and tightness,slight environment effect,and long maintenance cycle.But,the disconnector operation in GIS can generate very fast transient overvoltage（VFTO）,which does great harm to GIS,especially when the voltage level of GIS is higher than 330 kV.In order to simulate VFTO in ultra high voltage（UHV） GIS,an experimental platform for generating VFTO was designed by using impulse voltage generators and voltage sharpening devices.To the generate voltage waveform with amplitude of up to 2.5 MV and oscillating frequency up to 35 MHz,the amplitude of output voltage was controlled by adjusting the breakdown voltage of sharpening gap;and the length of bus bar in GIS was increased to reduce the influence of circuit inductance.A capacitive sensor with a RC integrator was developed for measurements of VFTO.The result of the test indicates that the capacitive sensor is able to measure the VFTO waveform with higher accuracy.

关 键 词：特高压 气体绝缘开关设备 特快速瞬态过电压 电容传感器 

分 类 号：TM85[电气工程—高电压与绝缘技术]