雷击特高压变电站时电磁骚扰特性的预测  

Prediction of Electromagnetic Disturbance by Lightning Strike in UHV Substation

作　　者：齐磊[1] 李泓志[1] 崔翔[1] 吴燕[1] 白锋[1] 

机构地区：[1]华北电力大学高电压与电磁兼容北京市重点实验室,北京102206

出　　处：《高电压技术》2009年第8期1796-1801,共6页High Voltage Engineering

基　　金：国家自然科学基金(50707008);国际科技合作计划(2007DFA71250)~~

摘　　要：研究特高压变电站保护与控制设备的电磁兼容问题对于确保特高压电网的可靠稳定运行具有重要意义。为此,将矩量法与Fourier变换技术相结合,研究了雷击特高压变电站时保护小室区域的瞬态电、磁场分布,以及在双端接地二次电缆上产生的屏蔽层电流和芯线共模干扰电压。预测计算表明:保护小室区域的最大瞬态磁场强度约为2285A/m,建议在保护小室墙体铺设金属屏蔽网以满足特高压变电站保护与控制设备的脉冲磁场抗扰度5级的要求;由于雷电流作用时间极短,再加上电缆沟内多根电缆和并联铜排的分流作用,不会导致二次电缆的烧毁;二次电缆的芯线共模干扰电压<1kV,低于特高压变电站保护与控制设备的浪涌抗扰度4级的要求。Electromagnetic compatibility issue of the protection and control equipment in UHV substation is of great importance to ensure the reliable and stable UHV power grid. Combined the method of moment with the Fourier transform, the transient electromagnetic field at the relay cell zone, current flow in the cable shield and commonmode voltage in the cable core are investigated due to the lightning strike on the lightning rod in UHV substation. The simulation results show that： （1） the maximum transient magnetic field at the relay cell zone is about 2285 A/m and the metal shielding structure on the wall of the relay cell is necessary to satisfy the requirements of pulse magnetic field immunity for the secondary equipment in UHV substation; （2） the current in the cable shield will not lead the secondary cable burned due to the shunt of the multi-cable and auxiliary copper bar; （3） the common-mode volt- age on the cable core is below 1kV and satisfies the requirements of surge immunity for the secondary equipment in UHV substation.

关 键 词：特高压 变电站 二次设备 雷击 电磁骚扰 矩量法 

分 类 号：TM862[电气工程—高电压与绝缘技术]