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北美作业代写:Computer network center lightning protection technology

2018-04-18 来源: 51due教员组 类别: Paper范文

下面为大家整理一篇优秀的paper代写范文- Computer network center lightning protection technology,供大家参考学习,这篇论文讨论了计算机网络中心防雷技术。在遭受雷电袭击后,雷电流凭借引下线及接地体向大地传输,并于接地体周边区域做放射型电位分布,假如发现计算机等电子信息设备靠近变化形成电位反击,此时电压通常能够达到上万伏。而计算机机房所处建筑物防雷装置便引雷入室,对计算机网络中线产生极大危害,所以计算机网络中心防雷需要建立多层防雷系统,层层设防,才能确保计算机网络中心可靠和安全。

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When lightning placement in high voltage side lightning form over-current and over-voltage, power supply module by power lines into the computer network center, lead to power supply by a certain impact, and caused power outages and the status of the network system collapse and so on; When lightning computer network communication lines, strong impact and heat directly lead to communication lines have been burned, overvoltage by communication lines to enter to the network system, lead to the destruction of the switches, routers and other devices by certain; When wireless communication antenna lightning attacks by day feeder invasion into the center of computer network, lead to equipment of router, communication interface and other network communication components have been damaged.

After the lightning attacks, lightning current transmission with down lead and earth body to the earth, and in the surrounding area to do radiation type grounding body potential distribution, if found that computer and other electronic equipment change near the formation potential, the voltage can usually reach tens of thousands of volts. And computer room in the building lightning protection devices lead thunder home, produce great harm to computer network center line, so the computer network center for lightning protection need to establish a multilayer lightning protection system, layers of security, to ensure reliable and secure computer network center.

For computer network communication lines, the inductive overvoltage mainly covers 2 kinds, namely electrostatic induction and electromagnetic induction. The overvoltage wave is quickly penetrated into the computer network center and caused damage. This kind of magnetic field tends to be directly induced on the power line, and the computer network center is damaged by the induction of overvoltage mode into the network system. The high intensity lightning discharge can cause the electromagnetic induction of the computer network center within 1km from the location of the lightning strike, resulting in the damage of the system.

It is understood that a lightning strike, more than 80% of the high potential is through the power cord invasion, into the center of the computer network communications cable and power cable to LPZ0 and LPZ1, LPZ1 and LPZ2 area border and terminal equipment front-end furnish surge protector. The lightning protection of the power system requires multi-level protection, which can be matched with the relatively effective multi-level discharge energy to ensure that the SPD can use a long time and the equipment is reliable and stable. In the power supply into line position always furnish level 1 power surge current Iimp acuity 12.5 kA, Up 2.5 kV or less voltage protection level of the SPD, in power distribution box position installed power level 2 impact current Iimp acuity 10.0 kA, Up 1.5 kVSPD or less voltage protection level, the key power equipment installed power socket position level 3 SPD. The SPD connection wire shall be kept in a straight state, the length of the wire shall be less than 0.5m, and the grounding wire shall be connected by the same potential grounding bus, and shall be connected with the grounding main line of the electrical shaft.

In order to prevent the communication cable lead to lightning invasion computer network center, general lightning protection measures should be taken to be in the cable connected to the network communication equipment to access the SPD, which means need to be installed in the link a transient overvoltage protection, avoid thunder electric wave invasion and overvoltage, minimize lightning damage to signal system.

Shielding is intended to protect computer room facilities. When designing the computer room, the steel bar should be used as the main material, so as to form an equipotential network, which can effectively shunt the ray waves and realize shielding. Every computer containing sensitive to electromagnetic pulse signals between devices such as attachment to use shielded cable, or with wear metal shielding, shielding not only can easily solve the problem of equipotential and shunt, more to prevent lightning attacks have better effect.

In the design of lightning protection for computer network center, the building structure reinforcement and all kinds of metal wire, metal frame, metal devices, and lightning protection downlead connection, form unified conductive body, realize effective discharge lightning current; All kinds of metal pipes and metal fittings are welded together to form a closed and grounded Faraday cage to eliminate lightning induction.

Lightning may be in the metal pipe network, ground network, block bearing pressure equipment in the equipotential, if there is a separate set of special requirements, should be between two ground protection with the ground connection, usually exist alone, the two when two fixed with protector for grounding, lightning current instant connection, equipotential connection. Single phase 3 line should be used in many computer equipment, the power cord cable, used in wire, metal shell of the zero line and grounding wire, so the outlet should be connected to the computer using three hole socket have protective earthing of safety measures.

With the deepening of informatization and networking, computer network technology plays an irreplaceable role in all walks of life. Meteorological departments should strengthen the lightning disaster research, perfect computer network center lightning protection technology and innovation, improve safety and reliability of computer network center, and to ensure long-term safe and stable operation of computer network system.

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