The neutral point of the transformer used in the power supply system is directly grounded; The good metal connection between the non electrified metal parts of electrical equipment and the grounding body under normal working conditions is called grounding, with the former being the working grounding and the latter being the protective grounding. If the neutral point of the low-voltage side of the distribution transformer is directly grounded, this neutral point is called the zero point, and the line drawn from the neutral point is called the zero line. The metal casing of electrical equipment is directly connected to the neutral wire, which is called neutral connection. Flexible graphite grounding strip manufacturers remind everyone that in the grounding system, if a grounding fault occurs, it will form a single-phase short circuit, which will quickly activate the protective device, disconnect the faulty equipment, and thus prevent the danger of electric shock to the human body. Below, the editor of graphite based flexible grounding body will lead you to understand it together.

lightning equipotential bonding 

The editor of the graphite based flexible grounding body reminds you that when the lightning arrester captures lightning, the down conductor immediately rises to a high potential, which will cause side flashover to the conductors around the lightning protection system that are still at ground potential, and increase their potential, thereby posing a hazard to personnel and equipment. The simplest way to reduce this flashover hazard is to use a voltage equalizing ring to connect conductors at ground potential to the grounding device. If the distance between the metal facilities, electrical devices, and electronic equipment in the station and the conductors of the lightning protection system, especially the lightning protection device, does not meet the prescribed safety requirements, they should be connected to the lightning protection system with thicker wires for equipotential connection. In this way, when lightning current passes through, all facilities inside the station immediately form an "equipotential island", ensuring that there is no harmful potential difference between conductive components and no side flashover discharge occurs. A complete equipotential connection can also prevent the backlash caused by the increase in ground potential caused by lightning current entering the ground.

The purpose of equipotential bonding is to reduce the potential difference between various metal components and systems in the space that requires lightning protection. The editor of the graphite based flexible grounding body reminds you that metal components and systems passing through the boundaries of various lightning protection zones, as well as metal components and systems inside a lightning protection zone, should be connected to equipotential at the boundary of the lightning protection zone. Equipotential connection wires and bolted clamps should be used to make equipotential connections on equipotential connection strips, and lightning arresters should be used for transient equipotential connections when necessary.

Main body and requirements of equipotential connection

The editor of the graphite based flexible grounding body reminds you that the purpose of equipotential connection is to reduce the potential difference between various metal objects and the system in the space that requires lightning protection. When there is an information system inside a building, metal plates should be used for equipotential bonding strips in areas where lightning electromagnetic pulses are required to have the least impact, and multi-point connections should be made with steel bars or other shielding components. The main body for equipotential connection of all external conductive components entering the building should include the following:

1) The main metal components of the building where the equipment is located and the metal pipelines entering the building;

2) The power supply line contains exposed conductive parts;

3) Lightning protection device;

4) An information system composed of electronic devices.

The computer room of the building is equipped with metal shielding nets on all six sides, which should be evenly connected to the circular grounding busbar in the computer room at multiple points. Connect the equipment directly to the adjacent equipotential bonding strip with the shortest distance through a star shaped (S-shaped structure or mesh M-shaped) structure. Choose S-type for small computer rooms and M-type structure for large computer rooms. Shielded cables should be used as much as possible for power cables (wires) and communication cables (wires) in the computer room. After the overhead power line is led down from the terminal pole, it should be replaced with shielded cables. Before entering the building, it should be buried horizontally for more than 15 meters, with a burial depth greater than 0.5 meters. The shielding layer should be grounded at both ends, and unshielded cables should be threaded through galvanized iron pipes and buried horizontally for more than 15 meters, with both ends of the iron pipes grounded.

After understanding the above knowledge about lightning protection and grounding systems, let's now take a look at the construction process of lightning protection and grounding in the computer room?

Construction process requirements for lightning protection and grounding system in computer room

1. The editor of graphite based flexible grounding body reminds you that the specifications and models of surge protectors should meet the design requirements, and the installation position and method of surge protectors should comply with the design requirements or product installation instructions.

2. The specifications and models of the grounding device must comply with the design requirements and have a testing report issued by relevant institutions.

3. The testing instrument should be a grounding resistance tester, with an accuracy of ± 2% (reading+2 numbers) when the range is between 0.001 and 100 Ω.

4.To maintain stable system signals and reliable safety grounding, the polarity of all power sockets in the computer room must be consistent.

5. It is strictly prohibited to connect the AC workplace to a safe location within a power outlet.

construction tools

The small braid of the graphite base flexible grounding body reminds you of the electrician to assemble tools, hammer, hacksaw, electric hammer, impact drill, electric welding machine, tape measure, small wire, wire drop, tape measure, pink wire bag, big rope, twist mill (or chain block), wire tightener, pick, shovel, etc.