Seek help! UPS grounding problem in the computer room!

Whether the working ground, the protective ground, and the anti-static ground can all be connected to the same copper bar"

Protective grounding, working grounding, and DC grounding are separated from each other on the equipment and become independent systems. Three mutually insulated ground terminals can be drawn from the cabinet, and then led by the leads to the total equipotential copper bar for common grounding.

From the perspective of lightning protection requirements, pressure equalization can avoid counterattacks, and pressure equalization requires multi-point grounding. The requirement of anti-interference should be single-point grounding, so only by doing a good job of equipotential connection of the ground network of the computer room and connecting it to the comprehensive ground grid of the building through a single point can the above two contradictory requirements be taken into account at the same time.

The equipotential system is generally composed as follows:

Under the anti-static floor of each computer room, 3 30mm copper strip is used to make an equipotential net.

The "safety protection grounding" of all equipment, the "AC working grounding" of the power supply, the "DC signal ground" of the computer, and the "lightning protection ground" of the lightning arrester are all connected to the equipotential network.

Connect all the "ground" holes of all single-phase three-pin sockets in the equipment room to the equipotential grid.

Connect the equipment in the room and the enclosure of the UPS to the equipotential net.

Use a 50 mm 2 multi-core copper rubber cable to lead the equipotential network of the computer room to the building ground grid (or the main reinforcement of the structure reserved for civil engineering) to form the actual effect of "single-point grounding" of the equipment in the computer room, which can prevent the independent "DC ground grid" from being counterattacked by the lightning ground potential and damaging the sub-equipment. It can also play the role of anti-interference.

UPS is generally an ungrounded system due to the importance of its users and the need for reliable power supply. With a voltmeter, the neutral wire can be grounded when the voltage reaches 0, and the live wire can be grounded above 50. As for why you can't connect the lightning rod, I don't know very well about this, you just use a separate lead to ground, I'll just connect it like this, and I've had no problems for four years.

That is to put alone, grounding is for safety, connecting together is risky, if you encounter a lightning strike, then your computer room will not be over.

The wire connected between the copper strip and the grounding electrode shall not be less than 25mm2, which is specified in the specification.

Don't pick it up like this. According to the national lightning protection and protection grounding specifications, the working and protective grounding devices should be separated from the lightning protection grounding to prevent lightning current from damaging equipment and endangering personal safety due to poor grounding.

There is an electric spark because you use a simple grounding body, the grounding resistance is large (the general civil electricity grounding resistance is not more than 4 ohms, lightning protection grounding is not more than 30), and the grounding body voltage to the ground is not zero.

Do you have two lightning protection grounds, one of which is the grounding of the building itself, is the resistance ohm high? Then your other grounding is the grounding of the computer room itself?

In addition, the grounding of the UPS host you are talking about is equipotential connected to the grounding of the building or the grounding of your computer room itself?

Also, which copper bar in the computer room do you use wires to connect with the steel bars of the building itself? Is the steel bar of the building itself connected to the grounding grid of the building?

The grounding system is an important part of the power supply system, which not only directly affects the normal operation of the power system, but also plays a role in protecting personal safety.

For a computer room, the grounding mode has an impact on whether the UPS system can work normally, and the generally more reliable method is a point of grounding, that is, all the equipment in the computer room system AC ground, DC ground, safety ground, etc. are directly connected to the ground pile, so the advantage is: when the ground potential changes, the equipment is like a boat floating on the water, the water rises and the boat rises, everyone's ground potential is the same, there is no potential difference, the relative relationship has not changed, so the work is normal, otherwise, If the ground of all equipment is connected to a ground wire, when there is a current flowing into the ground through the ground wire, a voltage drop is formed along the direction of the current, so the equipment connected to different points of the ground wire has different ground potential, and the signal voltage base point has changed, of course, the relative relationship between them has changed, and the system will inevitably not make mistakes. In order to prevent lightning strikes, there is no grounding measure to reduce the impact of the current on its own components, and it is easy to paralyze the entire computer room system.

Resources.

Reasons why UPS is grounded:

1. There is a high voltage inside the UPS, if it is not grounded, once the fault occurs, it may make the metal shell live and endanger personal safety;

2. Some equipment has higher requirements for the voltage between the ground and the ground, such as not grounding or poor grounding will make the voltage of the zero and ground too high and the user equipment can not work normally or even malfunction.

UPS, that is, uninterruptible power supply, is a kind of uninterruptible power supply with energy storage device and inverter as the main component to obtain constant voltage and constant frequency. It is mainly used to provide uninterrupted power to a single computer, computer network system or other power electronic equipment**.

1.Because the plug of your computer is plugged into the UPS, the power supply of the computer should be grounded, so the power plug of the UPS must also be grounded, and this grounding is connected together.

2.Both the computer and the UPS are metal shells, and their "common ground" is also connected to their respective housings, forming a "0 potential" ground.

3.Protection against electric shock.

Prevent the shell from being charged and injuring people.

Reasons for UPS Grounding:

When the UPS equipment is not grounded, the UPS equipment and the ground reference point are highly isolated from the zero potential, which is not a big problem in the normal operation of the UPS, however, when the residual energy in the machine (generally stored in electrical components such as capacitors) is to be released or the equipment has leakage current, if these energies have no grounding path to go, it is possible to form a circulation current inside the machine, resulting in abnormal heating and failure of the components of the machine. In serious cases, it may even cause the machine itself to be electrified and cause personal injury.

On the one hand, there is a high voltage inside the UPS, if it is not grounded, once it fails, it may make its metal shell live and endanger personal safety; On the other hand, some equipment has higher requirements for the voltage between zero and ground, such as no grounding or poor grounding, which will make the zero and ground voltage too high, so that the user equipment can not work normally or even fail. Whether UPS is grounded or not is not entirely considered from the aspect of UPS working performance, but the important thing is the requirement of work safety. At the same time, in a large number of practical applications, it is found that if the electronic equipment lacks a good grounding point, the probability of some factors such as electrical interference, signal attenuation and unpredictable failure will be greatly increased.

According to your description, lightning protection cannot be guaranteed.

1.There is no equipotential grid in the machine room. A circle of flat steel should be laid along the machine room, and the equipotential row should be reserved, and the flat steel should be welded with the main steel bar of the wall column in many places.

The equipment and cabinets in the computer room should be connected to the equipotential row with metal flexible wires to ensure that the excessive resistance between them does not exceed ohms.

2.The computer room is not shielded. If conditions permit, the metal mesh should be used to wrap the computer room, and the lines in and out of the computer room need to wear metal pipes, and the metal pipes should be grounded, and the metal sheath of the lines should also be connected to the equipotential.

If there is no condition, at least ensure that the metal sheath and metal pipe of the line are grounded and the metal doors and windows are grounded. Try to do a good job in the complete effectiveness of the Faraday electromagnetic cage in the computer room.

3.The effectiveness of the arrester installation is yet to be confirmed. I don't know whether the arrester specification selection is appropriate, and the arrester connection line obviously exceeds the specification requirements of meters.

Lightning protection grounding is to fully release the lightning energy, so as to reduce and avoid damage to the equipment It is a high-standard production safety project!

First of all, it is wrong to use the building metal ring beam as the lightning protection grounding point! If it is said that the leakage prevention grounding of household electricity is okay, but you are a communication room, which is valuable equipment, how can you do lightning protection grounding! If it is serious, it will damage the building, which is very unsafe!

The correct method should be to make a lightning protection grounding grid outside the building, and then make a grounding row under the floor of the computer room, and the grounding row should be fully connected with the outdoor grounding grid. If the equipment is to be grounded, it will be grounded, and if it is not grounded, don't be connected, hehe! The equipment grounding should be equipotential grounding, and then the cabinet and the ground row should be connected ......

No matter how powerful the lightning protection project is, it is impossible to be 100% safe, and since the lightning protection is grounded, the result is not ......

Of course, the lightning protector must be used well, since it is on it, it is good, otherwise don't do it!

The ground bars are all copper bars for grounding......

Your computer room is so easy to receive mines, either there is a tower in front of you, or it is on the mountain, or there is a filthy ditch and hidden ditch nearby, which is not easy to get!

I'm not professional, it's all from the technicians, hehe.

My experience:

1. Do not overhead lines for external lines and extension lines;

2. Install security units on external lines and extension lines;

3. The program-controlled switch is grounded according to the standard;

Generally speaking, there is no big problem, and there is no problem if the weather is not particularly strong; It is normal for you to be struck by lightning when you use Wilson products, because it is a group**, not a program-controlled **switch; The testing standards of program-controlled switches are too different from those of the group.

Induction lightning is not easy to deal with, the outer line and the inner line must have lightning protection equipment, each equipment must be grounded, and it is best to shield the equipment in the place.

You are a mine, and the ground wire of the machine room should be connected to the ground alone, not to the building ground.

Wilson switch is too watery, don't blame anything else!!

AC working place computer, network equipment is the use of alternating current electrical equipment, these equipment in accordance with the provisions of the work to carry out work grounding, that is, AC three-phase four-wire system in the neutral wire directly connected to the ground, this is AC work grounding. After the neutral point is grounded, when a certain phase of the alternating current touches the ground, because the neutral point grounding resistance is only a few ohms, the grounding current becomes a single-phase short-circuit current with a large value. At this time, the corresponding protection equipment can quickly cut off the power supply, so as to protect the safety of people and equipment.

The implementation of the computer system exchange workplace can be considered according to the computer system and the supporting facilities of the computer room. Such as printers, scanners, tape drives, etc., the neutral point is connected in series with an insulated wire, connected to the center line of the distribution cabinet, and then grounded through the grounding bus; The neutral points of the supporting facilities in the computer room, such as compressors, fresh air units, voltage regulators, UPSs and other equipment in the air conditioner, should be grounded independently and in accordance with the provisions of the electrical code.

According to the use of the equipment and the number of different shots and settings, a small computer room can be one, and a large computer room has more grinding arguments (each cabinet has a row, each roaming has a distribution box, and there is also a copper belt under the electrostatic floor).

Emerson UPS computer room precision air conditioning report... Hehe.

Actually, there is no problem, it is a little simpler.

But it is best that I think that the whole computer room, including the building, should share a grounding body, and the grounding of the computer room is directly obtained from the MEB, so as to ensure that when lightning strikes the building, not all the equipment in the entire building is equal potential.

No problem, it's a little rudimentary

For lightning protection grounding, anti-static grounding, working grounding, etc., it is possible to use the public ground network.

There is no major problem in following the grounding principle of common ground and not common points

It doesn't matter if it's professional or not, it's mainly whether there are still legacy issues.

1 Does the ground resistance meet the requirements?

2/"The iron pipe is connected to the grounding wire binding post of the UPS head of the computer room through the copper wire", how far is it? What is the wire size? Is galvanized flat steel more suitable?

3 Is the power supply system and subsystems of the computer room lightning protected?

4 An equipotential connector can be added between the grounding wire and the grounding body.

No problem.

As for mine protection, that's a very complex scientific issue. A separate lightning protection system should be installed. The issue of lightning protection should also be considered when building the computer room.

There shouldn't be any problem! You can also do anti-static flooring.