Building Lightning Protection Technology Research And Application

Lightning is the most grand and important meteorological phenomena in nature, going with physical phenomenon such as voice, light and electricity. It can bring great impact to people. In these years, because of the fast building of high buildings and large mansions and the increasing applications of electronic information technology, all kinds of advanced electronic equipments are installed in all buildings. These equipments have qualities of low insulation, weak endurance of overvoltage and overcurrent and sensitivity for EMC disturb. Then more and more serious hazards and indirect heavy economic losses are arising from lightning disturbance. Therefore, in order to cut down such big losses it is really necessary to conduct the research of stroke-incidence rules and take effective measures to protect buildings against lightning.Theories and practice show that the lightning protection is a systematic engineering. The exterior protection and interior protection should be constituted as an integer. There are six main means of lightning protection: direct stroke lightning protection technique, earth connection technique, isoelectric level connection technique, shield technique, installing electronic arrester and synthetical wire layout technique. These means are helpful to prevent from damage of building and industrial equipment, especially of microelectronic instruments.This thesis provides an analysis of the lightning incidence. Knowledge about lightning as a whole is introduced, including the danger of the lightning, the styles of the lightning strike, and the characteristic of lightning current. Based on it, the essential reasons of the electric device's damage due to lightning strike and the ways of the lightning invasion are introduced. And then the electromagnetic field's distribution inside a building during lighting strike is calculated. Some effectively protective measures are presented for the electric devices inside the building. In addition, the protection methods of all kinds of information systems are discussed.Based on the former research and the practical cases, the thesis presents a lightning protection method. According to the principle of direct stroke lightning protection, induction protection and lightning wave, a group of lightning protection instruments are installed in the protected region or protected object. Then an engineering network is designed. As a result, the lightning energy is depleted by leading, obstructing, dispersing and releasing technique. By the practical running, the scheme is proved to be an economical, reasonable and effective one.