Brief introduction: The lightning protection design of computer information room is very common, but it is not detailed for the practical application in the building. Although the lightning protection design of the computer room is basically the same, the actual design and construction are very different. The comprehensive lightning protection design is mainly carried out for the information room of an industrial and commercial bureau whose size is less than 10mm2, and the comprehensive lightning protection technology of small computer room is analyzed with practical methods.
A, the composition of the computer room
Rugao Rucheng Industrial and Commercial Branch is located in the east of Rugao, and the information room is located on the fourth floor of the building. The information room is the core of data exchange, and the requirements for lightning protection are very strict. The building where the room is located adopts 1.0× 1.0m lightning protection, and the direct lightning protection has met the requirements and has a preliminary shielding effect. The power distribution system and communication system of the computer room are mainly designed for comprehensive lightning protection, and the structure of the computer room is as follows:
The power distribution is TN-S system, and the main distribution box 20 meters north of the building where the computer room is located is buried in the power distribution cabinet of the computer room on the fourth floor, and the power supply is divided into four ways.
Second, the power distribution system
The power distribution is TN-S system, and the main distribution box 20 meters north of the building where the computer room is located is buried in the power distribution cabinet of the computer room on the fourth floor, and the power supply is divided into four ways. The incoming line from the main distribution box to the fourth floor is sold through metal shielding tube, and both ends of the metal shielding tube are grounded.
According to the requirements of Code for Lightning Protection Design of Buildings (GB50057-94(2000 edition) and Technical Code for Lightning Protection of Building Electronic Information Systems (GB50343-2004), the distribution system should adopt three-stage shunt. In this project, it is considered to install the first-class power surge protector in the main distribution box (north side of the building) to achieve the purpose of initial discharge, and install the second-class power surge protector at the power distribution inlet on the fourth floor.
Install an air switch in front of the power surge protector to prevent the impact on the whole distribution system when the surge protector fails. Select the table below.
The first-class surge protector is AM 1-40/3 NPE product of ASP company;
The continuous operating voltage UC of the distribution system TN-S is 320/385 V.
Flow Imax=80KA Voltage protection level rises.
The color-changing display is modular and easy to replace.
The secondary surge protector is AM2-20/3 NPE product of ASP company;
The continuous operating voltage UC of the distribution system TN-S is 320/385 V.
Flow Imax=40KA Voltage protection level rises.
The color-changing display is modular and easy to replace.
Third, the information system.
Information system is the core of data exchange in the industrial and commercial bureau. The external line is introduced into the computer room by optical cable, and the reinforced core of optical cable is equipotentially connected at the entrance, which can be connected to the bus nearby.
The whole data network is routed and exchanged by routers, which are the core network devices. The signal surge protector is installed at RJ45 interface, and two RJ45-E 100/4S signal surge protectors from ASP company are selected.
For switches, each switch adopts XP 19-24E signal surge protector of ASP company. XP series consists of two parts: base and module, which can be replaced separately, providing great convenience.
The damage of one module in XP series does not affect the work of other modules, and it is convenient to replace, which is an optimized product for lightning protection of switches.
According to the number of switches, determine the number of installed XP 19-24E signal surge protectors. Its grounding adopts 16mm2 multi-strand copper conductor (double color) and is connected to the bus nearby.
IV. Shielding and Integrated Wiring
The computer room is shielded by "aluminum-plastic board" on the periphery and roof, and a grid of 0.6×0.6m is made of 30×3mm thin copper bars under the ground electrostatic floor. The whole "aluminum-plastic board" is equipotentially connected with the thin copper bars, forming a "faraday cage" effect, which can greatly reduce the invasion of lightning electromagnetic waves.
The network wiring adopts "Super Five" network cable with AMP head and standard 19-inch distribution frame, and the network cable adopts electrostatic floor-mounted bridge wiring, which runs through the whole process and both ends are grounded.
Verb (abbreviation for verb) grounding system
The whole computer room is naturally grounded in the building. The main reinforcement of constructional column is welded with 40×4 flat iron, and the bus bar is made under electrostatic floor. Considering that the room area is about 10m2, S-type equipotential connection is adopted, and all lightning protection and functional grounding are connected to the bus nearby.
The bus bar is arranged under the electrostatic floor, and the cable reinforcement core, power surge protector, signal surge protector, cabinet and metal pipe entering the machine room are all equipotentially connected with the bus bar, as shown in the following figure, with an S-shaped structure.
The welded flat steel of the bus bar and the main reinforcement is connected by 16mm2 multi-strand copper wire (double color), the RJ45 interface signal SPD is connected to the distribution frame by multi-strand copper wire (double color) not less than 1.5mm2, and the distribution frame is connected to the bus bar by 6mm2 multi-strand copper wire (double color).
The measured comprehensive grounding resistance is less than1Ω, forming a good grounding.
Ending of intransitive verbs
This project mainly expounds the specific practices in practice from the perspective of actual design and construction, but some small details need to be paid attention to during construction, such as whether the main reinforcement in the constructional column is grounded, so as to determine whether it is a lightning protection downlead, and it will be very troublesome if it is not welded.
Attention should be paid to the energy coordination among the three-level surge protectors in the power distribution system. The grounding wire should be constructed in strict accordance with the requirements of 6.5 surge protectors and Table 6.5. 1 in Technical Specification for Lightning Protection of Building Electronic Information Systems, and the length should not exceed 0.5m If the actual operation is difficult, the grounding wire can be appropriately thickened.
Lightning protection engineering is a systematic engineering, and only by comprehensive system protection can lightning protection buildings be established.
References:
1, Code for Lightning Protection Design of Buildings (GB 50057-94, revised in 2000);
2. Technical Specification for Lightning Protection of Building Electronic Information System (GB 50343-2004；; );
3. Lightning electromagnetic pulse protection IEC 665438 Part III: Requirements for surge protectors:
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