What are the misunderstandings of lightning protection in UPS applications?

1.The usual lightning protection should be completed in the low-voltage distribution cabinet, and should not be completed by UPS, but the standards formulated by some domestic experts require that UPS itself has the function of lightning protection, which is not right; UPS is an electrical appliance relative to the power grid, and there are other standards that stipulate that the electrical appliance must have lightning protection function; Does your TV have lightning protection?

It is the power electronic equipment with the largest conduction disturbance level that produces electromagnetic compatibility, so the design of UPS must consider the requirements of electromagnetic compatibility and meet the relevant standards; However, once the UPS itself is required to have lightning protection function, it is necessary to add lightning protection; This lightning protector will cause the effectiveness or function of the electromagnetic compatibility filter, resulting in the UPS can not meet the electromagnetic compatibility standard, and the problem is very serious;

3.To sum up, lightning protection should be realized in the voltage switchboard, not in the UPS itself, UPS only needs to have the function of discharging the voltage to prevent the residual voltage of the lightning protection device in the switchboard.

Lightning protection is first and foremost a power distribution issue for building construction, and should not be implemented in the UPS itself. Of course, if the building itself is very old and there is no lightning protection consideration, UPS can indeed play a role in lightning protection, but as long as UPS, especially UPS, has the ability to block high voltage, that is, to sacrifice the small self and complete the ability of the big self, and there is no need to specifically ask the UPS to do anything. Of course, the exception is poorly designed UPS.

Also, if there is no UPS backup equipment, and there is no lightning protection measures under the power grid, is it really necessary to use lightning protection tow board. It's not expensive, about 100 yuan. Of course, this refers to 220V single-phase electricity.

The lightning protection of three-phase electrical equipment involves the thinking method after the switchboard, and the lightning protection device can only be added to the switchboard, and a professional electrician is invited to measure and configure the processing, and it is too risky to get the answer online.

UPS needs to be equipped with lightning protection device, generally UPS does not have its own lightning protection device, and needs to add lightning protection device. Electronic Guardian - Lightning Protection Expert Shenzhen Haiyi Technology Development **** will serve you wholeheartedly.

Generally, SPDs that do not have lightning protection need to be installed by themselves

It seems to be an external lightning protection device to avoid lightning strikes.

Before talking about UPS power lightning protection, we have to take a look at the working environment of UPS:

1. Whether there are lightning protection measures at the entrance of the mains power;

2. Whether there is grounding in or near the UPS;

If the mains is equipped with a T1 surge protector and a T2 surge protector is installed at the front end of the UPS, it is recommended that the IN is not less than 20KA and the UP is not greater than, and the UPS output is equipped with the T2 level, and the IN is recommended to be not less than 10KA and the UP is not greater than;

If the mains power is not equipped with a T1 surge protector, and a T1 surge protector is installed at the front end of the UPS, it is recommended that the IMP is not less than and the UP is not greater, and the UPS output is equipped with the T2 level, and the IN is recommended to be not less than 10KA and the UP is not greater than;

There should be a grounding point near the UPS, and the grounding should be repeated with the incoming power ground, and the grounding resistance should not be greater than 1 ohm.

At least level 2 lightning protection.

Surge protection and lightning protection standards, determined according to the local environment.

Direct lightning, induced lightning and lightning electromagnetic pulse may cause damage to the UPS power supply, so to do a good job in the lightning protection of UPS, it is necessary to strictly abide by the requirements of the comprehensive lightning protection system of the "Technical Specifications for Lightning Protection of Building Electronic Information System", and do the following:

1. It is necessary to take into account the external lightning protection measures and the internal lightning protection measures, make comprehensive plans, and do a good job in grounding and equipotential connection. Improve the external lightning protection system of the building where the equipment is located, and install lightning connectors, down wires and lightning protection grounding nets and other facilities in accordance with the national standard "Code for Lightning Protection Design of Buildings" (GB50057-94 (2000 Edition)). To do a good job in the grounding of the computer room, according to the national standard "Design Code for Electronic Computer Room" (GB50174-1993), AC working place, DC working place, safety protection ground, and lightning protection grounding should share a group of grounding devices, and the grounding resistance shall be determined according to the minimum value requirements; If separate grounding is necessary, equipotential co-ground couplings must be installed between the two places.

2. Multi-level protective measures should be taken. The so-called multi-level protection is to weaken the lightning current in layers in accordance with the principle of electromagnetic compatibility, and install the appropriate lightning arrester in the power line into the distribution cabinet, the floor distribution cabinet and the distribution box in the computer room. 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.

The central content of lightning protection is venting and balancing, and venting discharges as much and as far as possible of the lightning current to the ground, and rejects it from the communication system. Equalization is to reduce the potential difference generated by the lightning current on the conductive objects and prevent the lightning current from counterattacking.

3. The installation position of UPS power supply should be exquisite. According to the building zoning method of the International Electrotechnical Commission ICE1312-1 ((Protection against lightning and electromagnetic pulse), the UPS power room belongs to the LPZ1 area, and the objects in the area cannot be directly struck, and the electromagnetic field in the area may be attenuated. At the same time, in order to prevent the strong electromagnetic field generated by lightning current, the UPS power supply should be placed at a certain distance from the wall, and the distance from the outer wall column steel bar lead, that is, the equipment is in the safety zone of the lightning current magnetic field.

And the machine shell is shielded and grounded, and the cabinet door is reinforced with a wire to strengthen the connection with the ground, and the cabinet becomes the LPZ2 area.