Lightning protection for UPS power systems and communication ports

Lightning protection for UPS power supply

The lightning protection of UPS power system and communication port should be based on the relevant national regulations and the specific conditions of the application environment. A practical solution should be developed according to local conditions to establish an effective, scientific and economical lightning protection system. In view of the characteristics of the UPS system, its lightning protection should focus on the following points:

It is necessary to improve external lightning protection facilities and do a good job of grounding the computer room. According to the "Electronic Computer Room Design Specifications", AC, DC working ground, protection ground, and lightning protection ground should share a set of grounding devices, and the grounding resistance should be determined according to the minimum value requirement. If separate grounding is required, an equipotential common ground connector must be installed between the two grounds. UPS often protects large data systems, which are more sensitive to lightning strikes. Even a small potential strike can often cause unnecessary losses.

It is necessary to take multi-level lightning protection measures. IEC61312-1 has a clear concept of lightning protection zones, which divides the areas that need lightning protection into:

LPZOA (OA zone), all objects within this zone may be directly struck by lightning, and at the same time, the electromagnetic field generated by lightning in this zone can propagate freely without attenuation.

LPZOB (OB zone): objects in this zone are within the protection range of the lightning rod and will not be directly struck by lightning. However, since there is no shielding device for the lightning electromagnetic field in this zone, the electromagnetic field generated by lightning can propagate freely without attenuation.

LPZ1 (Zone 1): Objects in this zone will not be directly struck by lightning because they are inside buildings. The current flowing through each conductor is smaller than that in LPZOB. The lightning electromagnetic field in this zone has different attenuation depending on the shielding measures.

LPZ2 (Zone 2), when it is necessary to further reduce lightning and electromagnetic fields, a 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 core of lightning protection is discharge and balance. Discharge discharges as much lightning current as possible and as far as possible to the ground, and excludes it from 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, the corresponding signal arrester must be installed at the signal or communication line interface.

Selection and installation of lightning arresters

The lightning arrester product market is currently relatively abundant. You should try to choose a lightning arrester with a good reputation and reliable quality. The grounding wire of the lightning arrester should be no less than 6mm2 and connected with the straightest and shortest lead. It is best to use Kevin wiring to minimize the induced voltage on the lead.

The UPS power supply dedicated lightning protection box and UPS power supply must be grounded, the lightning arrester and UPS power supply must be connected to the same potential, and the UPS output line must have a ground wire. The grounding system is best to use high-quality grounding modules, which can ensure the reliability and corrosion resistance of the grounding resistance, and also avoid the need to transform the grounding network every 1-2 years, saving costs for the user unit.

Conclusion

With the improvement of UPS power supply intelligence, UPS power supply is often not just a complete product that can continue to power the load after the power grid is out of power, but a local highly reliable, fully functional, and highly intelligent power supply center, which plays an important role in ensuring the data security and smooth flow of information networks. The purpose of this article is to analyze the importance and necessity of UPS power supply lightning protection, hoping to draw everyone's attention to this issue. Lightning protection for UPS power supply systems is a highly professional job, and it is best to be carried out under the guidance of professionals. Pay attention to systematic considerations. UPS power supplies are now widely used in: industry, communications, national defense, hospitals, radio and television, computer business terminals, network servers, network equipment, data storage equipment and other fields.