Research On Lightning Protection Of Intelligent Building

With the rapid development of the process of the city,intelligent building as the representative of the intelligent building has been rise n rapidly.The intelligent building is widely used in all kinds of advanced electronic equipment and microelectronic equipment,which makes the transition from lightning damage of the building to the damage of the indoor network equipment,electronic equipment and other information equipment,thus electromagnetic interference and electromagnetic compatibility problems cannot be ignored.In this article,the transient magnetic field inside of the construction and the lightning current through the cage lightning protection system is discussed when the lighting struck the construction.First,the waveform of lighting and parameter characteristics are analyzed,and the peak current and spectral energy distribution is simulated.Then,a method of coupled inductor and the coupling capac itor and an equivalent model of lightning architecture basing on coupled transmission lines network model by combining equivalent model of lightning architecture with engineering practice is proposed,which magnetic linkage and electrical parameters of re inforced branch that counted by superposition theorem.The various parameters are obtained by Fourier transform in the frequency domain and the current distribution of each branch is obtained by inverse Fourier transform,and compared with the calculated results by the simulation software.The spatial magnetic field inside the building according the current of each branch can be gotten,and electromagnetic interference produced by spatial magnetic field can be analyzed.In this article,the related protection methods and measures to internal lighting that combines with the magnetic field inside the building are expounded,then,the protection methods of shield,equipotential bonding and landing are analyzed.According the load characteristic of the SPD,the protection coordination between the multi-stage is proposed,and compared protection feature with stage distance through the simulation.A new method is proposed that mixes some iron powder in the reinforced concrete,and the shielding effect in different quality and quantity by comparing experiments is analyzed,which can protect the influences of electrical equipment inside the construction from LEMP.