Second, lightning protection of signal lines
LEMP enters the external signal line through electrostatic induction, high potential counterattack, direct strike, etc., and then enters the device, causing serious damage to the interface and equipment. This is because the information lines are numerous and long, and they are easy to sense. Generally, they are shielded, grounded, and protected by lightning protection devices.
Third, the equipotential laying and grounding system
Under the anti-static floor of the equipment room, 30*3 copper belts are laid along the cement floor around the machine room to form the equipotential-bonding ring busbars. As the grounding device of the entire machine room, two-way connection must be made between the equipotential bonding ring bus bars and the grounding terminals. The metal enclosure of all equipment in the equipment room must be connected to the nearby grounding system. At the same time, equipment protection grounds, power PE lines, anti-static floor supports, power supply and network cable shielding slots, doors, windows, ceilings, switch cabinets, power supply lightning protection devices, signal lightning protection devices, and ground cables should be connected nearby. Equal potential connection on the ring bus, the ground wire using Î¦6-10 square strands of copper wire, so that all equipment in the engine room to form an equipotential system. For a machine room that does not have an anti-static floor, a copper strip should be laid around the wall in the room. Then, connect the protective ground wire of each device to the equipotential zone. In order to achieve full equipotentiality, eliminate the lightning counterattack phenomenon and protect the safety of workers.
Fourth, shielding measures
Lightning electromagnetic pulse impact equipment is mainly in the form of field and road coupling, the basic measure to reduce electromagnetic interference is shielding, in order to reduce the effects of lightning induction, should be combined with the use of external shielding, line laying in the appropriate road, line shields and other measures; It is inevitable that the metal shield absorbs or reflects to attenuate electromagnetic interference and overvoltage energy.
(1) Apply 50*50*0.5 white tin wire trunking along the line to shield the line. Put the signal cable into the wire trough to protect it. Connect the two ends of the wire trough with the grounding wire to connect the wire firmly. Therefore, the grounding can be well grounded; thus, the high-frequency interference voltage generated by the lightning strike electromagnetic pulse on the line can be reduced by 2 orders of magnitude.
(2) Screening of the engine room wall is generally protected by metal braided grid mask grounding or by aluminum alloy plastic plate decoration and grounding. At the same time, the process is required to be aesthetically pleasing. The metal braided mesh or aluminum alloy plastic plate and the grounding There should be no less than four reliable connections between the devices.
V. Other treatment measures
The correct location of the equipment room and the distance between equipment installations are equally important in lightning protection. According to the requirements of the IEC lightning protection standard, under normal circumstances, the engine room should be chosen to be safer on the floors below the top four floors, because the greater the diversion coefficient of the upward lightning current, the stronger the generated magnetic field strength, and the damage to the equipment. The stronger the degree
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