Application of Lightning Detection Data in the Characteristic Analysis of Electromagnetic Radiation in Near Space when Lightning Strikes the Electrical Transmission Tower

Due to the high-voltage tower's protruding space and material characteristics, which is easy to form characteristics of the electric field distortion, so lead to attract the lightning downward leader and add the possibility of lightning strike. The induced over-voltage is generated on the equipment by the electromagnetic radiation in the nearby space which often has tunnel, basement and other equipment space, leading to damage and malfunction accident, etc. Through the establishment of the typical 500 kV high-voltage tower and tunnel model, and combine with the characteristics of lightning current amplitude of ground lightning return stroke in recent ten years lightning detection data in Hangzhou area. Then use these characteristics to simulate the lightning strike in the time-domain, so it can be concluded that the distribution of lightning current on the surface of tower and the variation of electromagnetic field in underground space such as tunnel. Qualitative and quantitative methods are used to summarize the effect of shielding and grounding on radiation shielding protection, which can provide reference for electromagnetic radiation protection in the space near tower project.