The lightning protection of the ups power system and communication port shall be based on the relevant regulations of the state, and according to the specific conditions of the application environment, develop practical solutions according to local conditions, and establish an effective, scientific and economic lightning protection system. For the characteristics of the UPS system, its lightning protection should focus on the following points:
To improve the external lightning protection facilities and ground the equipment room, according to the "Design Specification for Electronic Computer Room", a set of grounding devices should be shared by the AC, DC working ground, protective ground, lightning protection grounding, and the grounding resistance should be determined according to the minimum requirements. If grounding must be provided separately, an equipotential common ground coupling must be installed between the two places. UPS protection is often a large data system, which is more sensitive to lightning counterattacks, even if a small potential counterattack, often causes unnecessary losses.
Multi-level lightning protection measures should be taken. IEC61312-1 has a clear concept of lightning protection zones, dividing the areas that require lightning protection into:
LPZOA (OA area), all objects in the area may be subjected to direct lightning strikes, and the electromagnetic field generated by lightning in this area can propagate freely without attenuation.
LPZOB (OB area), the objects in the area are not subject to direct lightning strikes within the protection range of the lightning receptor, but the lightning electromagnetic field in the area is free of shielding devices, and the electromagnetic field generated by lightning can also propagate freely without attenuation. .
LPZ1 (Zone 1), the objects in the area are not subject to direct lightning strikes in the building, the current flowing through each conductor is smaller than the LPZOB area, and the lightning electromagnetic field in this area has different attenuation according to different shielding measures. .
LPZ2 (Zone 2), when it is necessary to further reduce lightning and electromagnetic fields, the subsequent lightning protection zone should be introduced, and the requirements of the subsequent lightning protection zone should be selected according to the environment required by the protection system.
The central content of lightning protection is venting and equalization. The bleeder will discharge the lightning current as much as possible, as far as possible, to the ground and refuse to be outside the communication system. For UPS with signal or communication interface, in order to prevent lightning waves from being introduced from the signal or communication line, a corresponding signal lightning arrester must be installed at the signal or communication line interface.
The arrester product market is currently rich, and should choose the reputable and reliable lightning arrester. The grounding wire of the arrester should be no less than 6mm2. The most straight and shortest lead connection is used. It is best to use Kevin wiring in the wiring mode. Ground reduces the induced voltage on the leads.
The lightning protection box and UPS power supply for the UPS power supply must be grounded. The lightning protection device and the UPS power supply must be equipotentially connected. The UPS output circuit must have a ground wire. It is best to use a high-quality grounding module for the grounding system. These can ensure the reliability and corrosion resistance of the grounding resistance. It also avoids the modification of the grounding grid every 1-2 years, which saves the cost for the user.
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