Computer Network System Lightning Protection Program
(020-87530852,87540662)
(I) Implementation Plan
The design of a lightning protection system should meet the following principles:
1. The protector does not affect the normal operation of the protected equipment;
2. When a lightning strike generates a shock wave, the protective device used shall have a low impedance, and the impulse current shall be directly introduced into the earth without generating a dangerous impact on the ground potential difference;
3, protective devices should have a higher ability to withstand impact energy, and a standardized grounding system.
According to the IEC1312-1~3 specifications, to protect the equipment of your computer network system, the space to be protected is divided into different lightning protection zones (LPZ), and the severity of LEMP (Lead Flash Electromagnetic Pulse) varies according to the space of each part. The actual situation to establish the appropriate level of protection, the appropriate use of the appropriate lightning protection device.
(II) Power supply and signal lightning protection
1. Connect AOTEM's first-level (Class B) AT PORT/4P-B100 three-phase power source lightning protector to the air switch of the computer room building main distribution box of the Information Center to attenuate the strong lightning current and high voltage introduced from the power line. The lightning current pulse is reduced to a level that the equipment can withstand. Its technical parameters: the highest lightning current Iimp = 100KA (8/20), response time tA ≤ 25 ns.
2. Connect the AOTEM second-level C-class AT T385/4P-C40 three-phase power source lightning protector to the air switch of the computer room distribution box of the information center to attenuate the strong lightning current and high voltage introduced from the power line and put the lightning current. The pulse is reduced to the level that the equipment can withstand. Its technical parameters: the highest lightning current Iimp = 40KA (8/20), response time tA ≤ 25 ns.
3. Install AOTEM level III D-class AT A6420NS power supply lightning protection sockets at the power sockets of the central server, main switch and other accessories of the computer room, and attenuate the residual pressure filtered by the first and second level lightning protection devices again. Achieve a fine level of protection. Its technical parameters: the highest lightning current Iimp = 19KA (8/20), response time tA ≤ 25 ns.
4, room switch signal line lightning protection.
At the network port ports of the 24 network switches at the three network switches, AT RJ45-100-24E rack-mounted 24-port network signal lightning arresters were installed to protect the network switches from lightning wave intrusion from the signal lines and the network equipment. Its technical parameters: the highest lightning current Iimp = 2.5KA (8/20), response time tA ≤ 1ns.
5, ADSL line lightning protection
AOTEM's AT ADSL-RJ45/RJ11 signal lightning protector is installed on the ADSL line to protect the equipment on the ADSL line. In order to avoid the intrusion of lightning waves from the ADSL line, the network equipment is destroyed. Its technical parameters: the highest lightning current Iimp = 5KA (8/20), response time tA ≤ 1ns.
(3) Grounding system of the equipment room
The task of the grounding device is:
l Introduce lightning currents into the earth;
l Equipotential bonding between leads;
l Potential control near conductive building walls;
l Intercept lightning currents propagating on the ground.
1, grounding ground resistance requirements
Room grounding resistance requirements: R≤1Ω.
2, grounding structure
The grounding body in the engine room is an independent grounding device, so it is suitable for construction in A-type structure.
In the engine room, make a total collection of aluminum copper ATK008, specifications: 40mm × 4mm × 300mm, in order to ensure uniform distribution of ground potential, AC work grounding, safety protection grounding, DC grounding, lightning grounding and other four ground common grounding device. (Or in the engine room pressure belt.)
3, grounding material
Grounding ground network: Requirements R ≤ 1Ω, ATK008 total busbar + lead off 35 square 500 multi-core grounding line + grounding body.
Grounding body: It is buried in the ground and the down conductor is connected to the ground, and the lightning current is distributed to the earth. Normally, the vertical grounding body consisting of 400mm×500mm×60mm and Φ22×L4500mm optimized resistance reducing earthing rods is composed of AT automatic resistance-reducing grounding module, and horizontal grounding body is formed by welding with 40mm×4mm hot-dip galvanized grounding body to form a grounding ground net. Satisfy the requirements of national lightning protection grounding resistance R≤1Ω.