信息系统建筑物的雷击电磁脉冲防护分析

Analysing of Protection against Lightning Electromagnetic Impulse about Building of Information System

分析了信息系统建筑物的防雷击电磁脉冲的重要性和必要性。指出保护的前提是防直击雷,重点是防止感应雷入浸。提出在防感应雷保护设计中总的原则是采用三级保护:将绝大部分雷电流直接引入地下基础接地装置泄散,阻塞沿电源线或数据、信导线引入的过电压,限制被保护设备上浪涌过电压幅值(过电压保护)。结合建筑物特点就设计安装的3种措施进行论述,即:联合共用接地系统与等电位连接、屏蔽、安装电涌保护器(SPD),重点对电涌保护器在实际工程应用中设计配置方法进行了论述。

The importance and necessary of avoiding lightning electromagnetic impulse about buildings of information system were analyzed. It was pointed out that the premise of the protection is avoiding direct lightning flash and the emphases is preventing from invading of lightning induction. The principle of three stages of the protection for preventing lightning electromagnetic impulse in building design was analyzed, viz;1. put most of thunder flow directly into the earthing setting; 2. block the overvoltage through electric wire or data and signal wire; 3. restrict the surge overvoltage value through the protected equipment. Here three kinds of design methods were discussed according to the building, viz:common earthing system and equipotential bonding; electromagnetic shielding; installation of SPD. The design and configuration methods in the engineering applications of SPD were discussed.