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| Lightning Proof Transformation of Electrical Equipment in Highway Tunnel |
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| 2278 Beiträge - Forenlegende
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In this paper, the causes of damage to electrical equipment during the operation of Jinzishan tunnel in Zhongshan City are analyzed, and the countermeasures and suggestions for the lightning protection of the electrical equipment in the highway tunnel are put forward.
Zhongshan City Construction Bureau Jinzishan tunnel is located in Zhongshan City, Bo Ai Road, Zhongshan City, after the technical school of the mountain, from the north exit of the tunnel 100 meters at the management office with monitoring room. Control room and the tunnel between the power cables, control cables, communication cables and video signal electrical (optical) cable is connected. There are many groups of cameras installed in the tunnel. The tunnel adopts the computer monitoring system to monitor the power supply, ventilation, lighting, environment and traffic flow of the tunnel in real time. Besides, there are communication system and fire alarm system. In recent years, the frequent lightning has been the tunnel monitoring system, fire system, and many other paralysis. Therefore, it is very important to improve the lightning protection engineering of highway tunnel electrical equipment.
Principle Analysis of Lightning Damage Electrical Equipment in Highway Tunnel
Direct lightning and lightning induction
Depending on the way in which the lightning strikes the device, it is possible to divide the incoming lightning into direct lightning and induced lightning. Direct lightning is a lightning strike directly hit the building (structure) of other objects, earth, or an external lightning protection device to produce electrical effects, thermal effects, or external lightning protection devices. After several times of lightning damage to the tunnel analysis, direct lightning strike is difficult to cause damage to the tunnel electrical system. The real road tunnel monitoring equipment, the vast majority of the harm caused by lightning. The so-called induction mine is due to the thundercloud formation process, thundercloud and the earth between the electrostatic field and lightning strikes the ground or the ground protrusion, the thunderbolt current generated strong electromagnetic field line, the line induced over-voltage, over-current, Transmission line into the device and the formation of lightning.
Ways of Lightning Intrusion into Electrical Equipment of Highway Tunnels
There are two types of electrical equipment: one is lightning static induction, because the role of the thundercloud, so that the control room and the tunnel between the induction of the line and the Thundercloud symbol of the opposite charge, Thundercloud main discharge, the pilot The charge in the channel is quickly neutralized and the induced charge on the conductor is released to induce a very high induced voltage which can be detrimental to the electrical equipment of the tunnel. The other is the lightning electromagnetic induction, when the tunnel or near the tunnel when lightning occurs, due to lightning current changes in the lightning current channel near the formation of a strong induction electromagnetic field, the control room and the tunnel between the power lines , The signal line induced a high electromotive force, and along these lines intrusion control room and tunnel, so that the control room and tunnel electrical equipment damage.
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| Beitrag vom 03.11.2016 - 06:52 |
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