午夜欧美大片免费观看,欧美激情综合五月色丁香,亚洲日本在线视频观看,午夜精品福利在线

An analysis is made of the lightning electromagnetic pulses in the elevator on a high building top, combined with its geographical location, lightning environment, and lightning protection status. For the various types of shielding conditions of the elevator room, the induced voltages of the equipment are calculated, respectively. The shielding measures and other protection measures needed for the elevator are discussed. It is concluded that without shielding measures, the operation of the elevator will be affected, whether the lightning strikes on the elevator machine room or nearby buildings. With basic lightning protection measures, the elevator at the top of the building should install also a metal grid shielding (steel), with a radius of 0002 m, a grid width of 001 m.