Magnetic Field Intensity Analysis in Lightning Protection Zone of Elevator Machine Room for High Rise Buildings and Defense Technology
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Abstract:
In recent years, lightning induced elevator accidents often occur. The damage to the elevator is caused mainly through the approaches of surge intrusion, ground potential counterattack, and electromagnetic impulses. Through the on site identification of the professional personnel, it is found that the accidents are mostly caused by the damaged control board resulted from the lightning induced electromagnetic effect. The magnetic field intensities, for example, are calculated for the area of 218 m around the stroked building and the LPZ1, LPZ2 in the studied area in the case of lightning directly stroked on the buildings. The analysis is made of the damage mechanisms of lightning electromagnetic pulses to control equipment in the LPZ2 area of the elevator machine room, and it is concluded that to make the distance of 〖WTBX〗d〖WTBZ〗w as big as possible can reduce the magnetic field intensity values; if the shielding meshes for the LPZ1 area of the elevator machine room has a width of 015 m or less, when the lightning arrester on the top of the elevator machine room suffered a direct lightning of 150 kA or less, the control device in the computer room will not usually interfered by lightning electromagnetic pulses.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.