雷击变电站建筑物时室内暂态磁场环境分析  

Analysis of Transient Electromagnetic Environment Inside Substation Buildings When Struck by Lightning

作　　者：孙露 李满素 汪华 

机构地区：[1]重庆电力设计院,重庆400030 [2]宁夏自治区中卫供电局,宁夏中卫755005

出　　处：《华东电力》2010年第8期1226-1230,共5页East China Electric Power

摘　　要：为了分析内部地网的设置对雷击建筑物时室内弱电设备的影响规律,优化弱电设备的布置,介绍了利用电力系统电磁分析软件CDEGS建立浙江某110 kV变电站的仿真模型,分析了变电站建筑物内磁场强度的空间分布规律。计算结果表明,发生雷击时,添加二次地网前后建筑物内电磁场分布均成U形,靠近建筑物室内四周的磁场强度最大,且当建筑物存在内部地网时,空间电磁场对弱电设备信号线影响将随埋设深度发生变化。In order to analyze the patterns of the internal ground network setting influencing on the indoor weak current equipments in buildings struck by lightning and to optimize the layout of weak current equipments,the simulation model of a 100 kV substation in Zhejiang,established by applying the power system electromagnetic analysis software CDEGS,was presented.The spatial distribution pattern of the magnetic field intensity in the substation building was analyzed.The computation results showed that,before and after adding the secondary ground network,the magnetic field distribution inside the buildings both present as U-shaped when lightning occurs;the indoor magnetic field inten-sity near the surrounding of the buildings becomes maximum;and the impact of the spatial electromagnetic field on the signal line of the weak current equipments will vary with the burial depth when the building has internal ground network.

关 键 词：电磁干扰 二次地网 冲击接地 磁场分布 CDEGS 法拉第笼 

分 类 号：TM63[电气工程—电力系统及自动化]