What are the applications of security systems in computer room engineering?

Anti-static floor laying

In the construction of the computer room, the ground engineering is an important part. The floor of the machine room is generally made of anti-static raised floor. The raised floor is mainly composed of two parts. a) anti-static raised floor panel; b) floor support system, mainly for beam fulcrum (the fulcrum is divided into upper and lower support, the screw can be adjusted to adjust the floor level). The specifications are mainly 600*600mm. Laying height: 350±20mm, general resistance value between 1×107—1×1010ω, distributed load: greater than 1500kg/m2.

The raised floor has a detachable feature, so the connection of the wire and cable, the connection of the pipes and the repair and replacement of all the equipment are very convenient. The space under the raised floor can be used as a static air supply air ventilator. The cold air sent from the air conditioner of the computer room is sent into the cabinet of the indoor and heating equipment through the movable floor with the air distribution air outlet. Since the air flow vent floor and the movable floor are interchangeable, Therefore, the distribution of airflow in the equipment room can be freely adjusted. The ground surface under the raised floor generally needs to be treated with moisture (such as anti-moisture paint). When installing anti-static floor, it is required to install an electrostatic leakage system. Lay the static electricity leakage grounding net and seal it together with the grounding terminal of the static electricity leakage mains and the safety ground of the equipment room to leak static electricity.

Grounding system

The equipment room should be equipped with a good grounding system so that there is a stable zero potential in the power supply. As a reference voltage for the voltage of the power supply system, there is a good grounding wire. When the power supply voltage and signal in the computer transmission encounter or generate various interferences, It can be filtered out by high and low frequency filter capacitors. In addition, when encountering lightning, strong power sources near the cabinet, and spark interference, a good equipment room grounding system should be able to protect the computer. Therefore, it is very important to design a good grounding system for the equipment room. The grounding system of the equipment room is generally divided into the following three types: DC ground: This grounding system connects the power output terminal through the grounding ground to make it a stable zero potential. The power ground wire is directly connected to the earth and has a small grounding resistance. AC ground: This grounding system connects the ground wire of the AC power source with the grounding point of the AC electric equipment such as the motor and the generator, and then Earth connection; safely: In order to shield external interference, leakage and sparks, all computer cabinets, cabinets, cabinets, panels and motor casings need to be grounded and shielded. The system can be safe. General requirements: DC ground resistance is less than 1 ohm, AC grounding resistance is less than 4 ohms, and safe grounding resistance is less than 4 ohms. AC grounding, safety protection grounding, DC working grounding, lightning protection grounding, etc. Four groundings should share a set of grounding devices with a grounding resistance of less than 1 ohm; the grounding system can be connected with a radial, ring or square matrix In various forms, different connection methods can be selected according to geographical features.

Distribution System

1) ups uninterruptible power supply

The computer room load is divided into the main device load and the auxiliary device load. The main equipment load refers to the computer and network system, the computer external equipment and the equipment room monitoring system. This part of the power supply and distribution system is called the “equipment power supply and distribution system”. The power supply quality requirements are very high. The ups uninterruptible power supply should be used to ensure the power supply. Stability and reliability; auxiliary equipment load refers to air conditioning equipment, power equipment, lighting equipment, test equipment, etc., its power distribution system is called "auxiliary power supply and distribution system", and the power supply is directly powered by the mains. In the demanding computer room project, the ups uninterruptible power supply can adopt direct parallel technology, and its power distribution system is called n+1 redundant parallel technology. It ensures uninterrupted and reliable power supply for all loads in the event of an ups failure, and requires only direct parallel connection to existing parallel systems when expansion is required, without the need to add new ups supply systems. Can effectively save costs. Electrical construction in the equipment room should select high quality cables, trunking and sockets. The socket should be divided into mains, ups and waterproof sockets for main equipment.

2) Power distribution cabinet

The equipment room often uses the computer room dedicated power distribution cabinet to regulate the power supply and distribution system of the equipment room to ensure the safety and reasonableness of the power supply and distribution system of the equipment room. The distribution box and cabinet should have short circuit and over current protection, and the emergency power off button is interlocked with the fire alarm. After installation, number them and indicate the purpose of each switch in the box and cabinet for easy operation and maintenance. There is a backup circuit in the distribution box and cabinet to use electricity when the equipment room is expanded.

Monitoring and access control system

There are a large number of servers, cabinets and racks in the monitoring equipment room. Since these cabinets and racks are generally relatively high, there are many dead angles for monitoring. Therefore, in the TV monitoring and distribution, the main entrances and exits are mainly considered, and the cameras are installed between each row of cabinets. If the space at each entrance and exit is relatively large, consider using a camera with zoom. Between each row of cabinets, the focus camera can be configured according to the monitoring distance. If there are multiple rooms in the equipment room, consider installing cameras in the ups room and control room.

The computer room access control system mostly adopts the non-contact intelligent IC card integrated management system. The system can flexibly and conveniently specify the personnel, time and authority to enter the equipment room, prevent damage caused by human factors, and ensure the safety of the equipment room.

Fire Fighting System

The engine room should be equipped with a gas-extinguishing system. The gas cylinders should be located outside the machine room. It is a pipe network structure. The nozzles are arranged on the top of the ceiling. The fire alarm system consists of a fire control box, smoke sense and temperature sense networking. The fire protection system of the equipment room should adopt a gas fire protection system. The common gases are heptafluoropropane and sde.

Shielding system

Electromagnetic interference has a great impact on computer equipment. If it is light, it will cause misoperation and data loss. If it is heavy, the computer will not work. The shielding of the equipment room mainly prevents damage to equipment room and signals caused by various electromagnetic interferences. There are two common types: metal mesh shielding and metal plate shielding. China's requirements for electromagnetic interference in computer rooms are: the radio interference field strength in the equipment room is not more than 120db in the frequency range of 0.15~1000mhz, and the magnetic field interference field strength in the equipment room is not more than 800a/m (equivalent to 10oe). According to the different requirements of the shielding effect of the equipment room, the frequency band of the shielding is different. The material and construction method of the shielding system are selected. The requirements of each index should be strictly in accordance with national standards.