220kV高海拔变电站出线段采用500kV线路降压运行时的雷电侵入波过电压  

Lightning Intruding Wave Overvoltage of 220 kV High-Altitude Substation of Which Outlet Section Adopts 500 kV Line

作　　者：吴华实 何泽宇 陈小月 王邹俊 文习山[1] 蓝磊[1] WU Huashi;HE Zeyu;CHEN Xiaoyue;WANG Zoujun;WEN Xishan;LAN Lei(School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学电气与自动化学院,武汉430072

出　　处：《电瓷避雷器》2021年第4期100-105,共6页Insulators and Surge Arresters

摘　　要：笔者依托于某实际工程,计算了220 kV高海拔变电站出线段采用500 kV线路降压运行时站内设备上的雷电反击侵入波过电压,与采用常规220 kV出线的变电站相比,出线段采用500 kV线路降压运行时各设备上的雷电侵入波过电压更高,其中线路高抗上的过电压超过了其内绝缘保证强度;计算了采用不同避雷器配置方案进行保护时高抗上的雷电侵入波过电压,在距离高抗间隔16 m的位置装设避雷器时高抗上的雷电反击侵入波过电压较低,能够满足绝缘要求,但高抗处避雷器的放电电流超过了其标称值,对高抗处避雷器的放电能量进行校验发现其放电能量并不高;高抗处避雷器配置采用并联装设方案能够有效降低高抗上的雷电反击侵入波过电压且单只避雷器上的放电电流不会超过其标称值。Relying on an actual project,the lightning intruding wave overvoltage of main equipment in the220 kV high-altitude substation using 500 kV line in outlet section is calculated,compared to a substation using a conventional 220 kV outlet,the lightning intruding wave overvoltage of 220 kV high-altitude substation station using 500 kV line in outlet section is higher,the overvoltage of the shunt line reactor exceeds the inner insulation withstanding voltage;The lightning intruding wave overvoltage with shunt line reactor when using different arrester configuration schemes is calculated,when the lightning arrester is installed at a position 16 m from the reactor,the intrusion wave overvoltage of the reactor is low,which can meet the insulation requirements.However,the discharge current of the arrester protecting the reactor exceeds its nominal value.The discharge energy of the arrester is verified to be low.The scheme of parallel installation with lightning arrester can effectively reduce the intrusion wave overvoltage of the reactor and the lightning impulse discharge current of a single arrester.

关 键 词：变电站 降压运行 雷电反击 避雷器 

分 类 号：TM63[电气工程—电力系统及自动化] TM863