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The lightning protection of the equipment room is a systematic project

12-10-2019

The lightning protection of the equipment room is a systematic project. Grounding is the most important part of lightning protection technology. Whether it is direct lightning, inductive lightning, or other forms of lightning, the lightning current is finally sent to the earth. Therefore, there is no reasonable and good grounding device that cannot reliably resist lightning. The smaller the grounding resistance, the faster the dispersion, and the shorter the holding time of the lightning strike object, the lower the risk. For the grounding resistance of the computer field, the requirement is ≤ 4 ohms, and the method of common grounding is adopted to unify the lightning protection grounding, electrical safety grounding, AC grounding, and DC grounding into one grounding device. If there are special requirements to set up independent, it should be connected with the ground pole protector between the two networks, so that the two ground nets are usually independent, to prevent interference, when the lightning current comes, the two grounds pass the ground protection The devices are connected in an instant to form an equipotential bonding.

An important aspect of lightning protection engineering is the grounding and wiring engineering of the down-line. The lightning protection effect of the whole project and even the lightning protection device are all dependent on this, so serious system research should be carried out. Grounding of electric and electronic equipment is a necessary measure to ensure equipment safety, operator safety and normal operation of equipment. It can be considered that all instruments and equipment connected to the power grid should be grounded; where the power needs to be reached, it is the place where the grounding project needs to be done, so that the human body avoids the risk of electric shock.

In order to make lightning surge currents leak into the earth, the protected objects are protected from surges and overcurrents such as direct lightning strikes or induced lightning. All buildings, electrical equipment, lines, networks, etc. are not charged with metal parts. Sets, arresters, and all water and gas pipelines should be metal-connected with lightning protection grounding devices. The lightning protection grounding device includes a lightning rod, a belt, a wire, a net, a grounding down conductor, a grounding lead wire, a grounding collecting line, a grounding body, and the like. In order to prevent counterattack, the previous lightning protection specification proposes a set of restrictions between the lightning protection grounding and other grounding, that is, the shortest distance between the two types of grounding bodies and the grounding wire. In some cases, when the spacing cannot be pulled to the specified value, strict insulation measures should be taken.