Analysing of Protection against Lightning Electromagnetic Impulse about Building of Information System
WU Liang-hui · Low Voltage Apparatus · 2004
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.