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Equipotential design basis and lightning protection measures -
Design basis
"Protection of lightning electromagnetic pulses"
"Lightning Protection Design Specifications for Buildings"
National Standard "Design Specification for Computer Room"
Cable and television signal distribution equipment and components, general specification of lightning arresters
National Standard "Civil Electrical Design Code"
"Design Specification for Lightning Overvoltage Protection Engineering of Communication Bureau (Station)"
"Provisions on Lightning Protection Technology of Communication Engineering Power System"
International Electrotechnical Commission IEC series standards
Customer-supplied information, as well as on-site surveys and data collected by technicians.
2. Protective measures
In summary, current lightning protection methods for electronic devices mainly employ five methods of shunting, grounding, shielding, equal potential and overvoltage protection.
Diversion: Using lightning rods, lightning protection strips, and lightning protection nets, lightning currents will be safely flowed into the earth along the downline to prevent direct lightning strikes on buildings and equipment. (taken by the launch tower and the tower network)
Shielding: All metal wires in the building, including power cables, communication cables and signal cables, are shielded or shielded by metal pipes. In the construction of the computer room, the steel mesh of the building and other metal materials are used to form a Faraday cage in the machine room. . To prevent external electromagnetic waves (including lightning electromagnetic waves and electrostatic induction) to interfere with equipment in the equipment room. However, professional screening is a very costly practice and we do not think it is necessary for the status of the county or city. (building reinforcement has a certain electromagnetic shielding effect)
Equipotential bonding: All switches and auxiliary equipment in the equipment room, including cable shields, metal pipes, and equipment enclosures, are electrically connected in order to equalize the potential.
Grounding: This is a lightning protection method that completely relies on the ground network to discharge the lightning. Its disadvantage is that it is limited by the grounding resistance and cannot achieve the desired lightning protection effect. But for personal safety, it must be grounded.
Over-voltage protection: The corresponding over-voltage protection device is installed on the signal line and power line of the electronic equipment. With its non-linear effect, the excessively high pulse voltage on the line is filtered out and the protection device is not destroyed by the over-voltage.
With reference to the above protective measures and the actual situation of the users, we believe that the lightning protection of all equipment in the Lotus Peak Police Station is based on overvoltage protection, especially the overvoltage protection using our “equipotential†products. Since the lightning protection effect of “equipotential†products has nothing to do with the grounding resistance, this ensures that, under any situation of change or limitation, the lightning protection effect cannot be achieved due to the influence of the grounding resistance. Therefore, we propose the following specific lightning protection design.