Research And Design Of Lightning Protection Grounding System For Super High Intelligence Buildings

Lightning is a majestic and destructive weather phenomena in the sky.Its occurrence and development process is very special.And has the characteristics of transient high voltage,large current and strong electromagnetic radiation.Often hit buildings and equipment and cause major disasters.With the development of social economy,the application of various new building materials,mechanical and electrical equipment and computer network system in the construction industry makes the building more intelligent and high level.A variety of high-rise,high-rise building more and more,has become a new trend in the development of the city.And how to protect these super high-rise buildings and its internal equipment is not affected by the lightning,become an urgent need to solve the problem.Specific methods are as follows:(1).Through selection of the lightning rod,calculation of the number and section area of Lightning lead off line,selection and installation of grounding device,Design of the high rise building roof flash device,Lightning line,the pressure ring and the grounding device constitute the external lightning defense system,to protect buildings from lightning damage.(2).Through calculation of shielding current of buried cable and pipeline,Shock current calculation of the Surge protective device.Determine the grounding hierarchical protection Principle.Metal piping,High and low voltage cable and other metal conductive body in and out of buildings to do grounding protection.In the high and low voltage power distribution cabinet,transformer department to set up surge protective device and other measures to prevent the invasion of lightning wave.(3).Through calculation of metal pipe,metal equipment induced voltage and current value of the building,determine the degree of attenuation of electromagnetic induction,we designing the power distribution system,intelligent weak current system grounding mode and equal potential connection,to protection of computer and other electric control systems in buildings is not affected by the electromagnetic induction.Finally,Through designed the lightning protection and grounding system of the SOHO International Building in Zhongguancun.Proved the feasibility of the above design.This graduate thesis studies and designs a set of complete and feasible electric lightning protection system for super high rise buildings.reference for lightning protection of similar buildings,Greatly improve the design and construction quality of super tall buildings.