Lightning Protection Theory And Engineering Practice For The Contemporaneity Buildings

Lightning protection problem has been a major concern in the world. Lightning stroke not only directly destroys the grounding objectives but the produced electromagnetic field will threaten the electrical equipment especially the electronic equipment by coupling. So, sustained effort of lightning protection personnel and experts is necessary to investigate the features and laws of lightning stroke so as the corresponding measures can be taken to protect the building and electronic devices in it.There are many electronic installations and computer systems in the intellectualized building. Its information system is make up of three systems, which are the Building Automation System(BAS),the Telecommunication System(TCS) and the Office Automation System(OAS) , these systems comprise some subsystems itself. These installations and systems are just able to bear the low voltage and need to properly avoid the electromagnetic interference, they have little capacity to protect the impact of lightning stroke. The lightning rods of the normal building introduce powerful lightning current through earth wires to the ground. It produces powerful electromagnetic field variation in the space and induces over-voltage on the nearby conductors. So, direct stroke defending system of the normal building may introduce lightning impact to instead protect the electronic installation and computer system. Lightning protection of intellectualized building becomes a more and more important subject in front of us.Traditional lightning protection design can't satisfy the need of safe lightning protection anymore as the intellectualized building developing. Lightning protection is not only for the building itself protection, the more importance is to protect the personnel and the electronic installation in the building .Lightning disturbance threats the security of electronic equipments in the intellectualized system seriously. To reduce the lightning damage of the intellectualized building to the minimum, based on the actual situation of the main system of the intellectualized building , Lightning disturbance of electronic equipments is investigated ; the protection scheme of electronic equipments against lightning is proposed. The results in this paper have important significance in avoiding lightning disturbance and then enhancing the security of power system. The text provides a set of specific measure of the comprehensive lightning protection design for the Guangxi Observatory Integration Building. The main measures of the lighting protection include installing direct stroke protection device, common earth, shielding, equi-potential bonding, rational wiring, , installing corresponding surge protector at the line interface etc. the emphases is the induction over-voltage protection for the micro-electronic equipment so as to reduce the lightning damage to the minimum.