Why should the neutral line be grounded in the high voltage cabinet?

There are two types of high-voltage neutral lines.

1.Transmission grid neutral point. That is, the high-voltage three-phase electric neutral line. This neutral line is generally not grounded, and the neutral point is not grounded with many benefits, saving materials and equipment, reducing single-relative short-circuit failures and so on.

2.Transformer secondary grounding. It is estimated that this is what you see as the neutral line grounding of the high-voltage cabinet.

This is because, if the neutral line is not grounded, there is no reference point for the voltage of the entire grid to ground, and the grid-to-ground voltage may drift to a large level. For example, the residential phase voltage to the neutral line is 220V, but the neutral line is not grounded Phase Voltage to the ground can reach 10kV. This is quite dangerous.

The insulation of the resident's house and the electrical cabinet cannot withstand the voltage of 10kVA, which will cause accidents.

The neutral line is the line drawn from the neutral point on the secondary side of the transformer, which forms a loop with the phase wire to supply power to the electrical equipment.

Neutral line (N): Mainly used in the working circuit, the main line is drawn out after the neutral point of the transformer is grounded.

Ground Wire (PE): Not used in working circuits, only as a protective wire. Using the absolute "0" voltage of the earth, when the equipment shell leaks, the current will quickly flow into the ground, and even if there is an open circuit in the PE line, it will flow into the ground from the nearby grounding body.

After grounding from the neutral point of the transformer, the main line is drawn out and the grounding is repeated every 20-30 meters).

Grounding safety is troublesome to take the line again, and there may be a danger of injury if there is a line.

High-voltage cabinet zero line grounding? It should be grounded in the shell and play a role in security.

The main purpose is to prevent induction or leakage.

The neutral line in the distribution cabinet can't be connected to the ground wire!

Distribution cabinet grounding**.

Because the main purpose of the ground wire is to introduce the fault current into the ground and prevent the occurrence of electric shock accidents.

The neutral line is the circuit wire, if the two are mixed together, it will bring great harm to personnel and equipment, so when wiring, we must strictly distinguish which is the zero line? Which is the ground wire?

This issue really needs to be taken seriously!

Look at how the connection method is.

Both the neutral and ground wires must be grounded according to certain specifications, and the same grounding device is allowed. So the resistance value between the two should not be large;

The neutral wire and the ground wire should be insulated from each other except for the grounding device. Therefore, after disconnecting the grounding device, the neutral and ground wires should not be turned on.

In the TN system, especially the TN-S system, in the distribution cabinet, the zero busbar is insulated from the cabinet, usually installed with an insulator, and the protective ground is directly connected to the metal of the cabinet. See figure.

No. To put it simply, the neutral line is used to form a closed circuit.

The ground wire is used to protect safety, and it is often called protective grounding.

In the power distribution cabinet, the neutral wire is usually connected to the busbar copper bar, and the ground wire can be directly connected to the chassis screw.

The transmission and distribution cabinet at the beginning of the transformer, because the neutral line (transformer working grounding) and the grounding wire of the distribution cabinet are relatively close, the neutral line and the grounding wire of the distribution cabinet can be connected at this position.

The neutral and ground wires of the device terminal cannot be connected together.

Summary. The practice of repeated grounding of the neutral line and ground wire of the primary distribution cabinet Hello dear, 1The buried depth is at the top of the pole, the welding place is rubbed with asphalt, and the flat steel lap distribution box and the switch box are grounded with 40*4 galvanized flat iron and the grounding of the main distribution cabinet are all connected and connected with the basic grounding network.

3.The repeated grounding of the fixed switch box is connected to the basic grounding grid. 4.

The practice of the zero line and the ground wire of the primary distribution cabinet is reconnected and brightened, hello dear, 1The buried depth is at the top of the pole, the welding and staring macro junction is rubbed with asphalt, and the flat steel lap distribution electric box and the switch box are grounded with 40*4 galvanized flat iron and the grounding of the main distribution cabinet are all connected and connected with the foundation absolutely wide grounding grid. 3.

The repeated grounding of the fixed switch box is connected to the basic grounding grid. 4.The bonded zero connection on the mechanical equipment and the bonded zero connection on the switch box.

Can the repeated grounding of the zero line and the ground wire of the first-level cabinet be connected with the power distribution room?

The neutral wire and the ground wire can not be reversed, if the mold is dry, the leakage protection switch will be used to cut off the power supply. Therefore, it is concluded that the zero wire and the ground wire can be connected before the input end of the leakage protection switch, but the output terminal cannot be reversed.

Is the neutral line of repeated grounding connected to the neutral line coming out of the power distribution room?

In addition to repeated grounding at the distribution room or main distribution box, the protection neutral line must also be repeatedly grounded at the middle and end of the distribution system.

That is to say, the repeated grounding of the neutral line is all in one line, right?

Yes dear. Do the ground wires have to be separated.

What is the role of putting salt in the trench of the ground line.

Of course, to separate the pro.

Summary. Hello, the zero line of the distribution box is grounded, to find out the problem, and solve the problem: first check the distribution box, start from the top of the distribution box, and measure the insulation resistance between the zero line and the ground wire, so that you can find out the problem.

After finding out the problem, start to solve the problem of neutral line grounding: the three-phase five-wire power system connects the neutral wire and the ground wire together, eliminates the neutral line grounding and makes the use of the distribution box safer.

What should I do if the zero line of the distribution box is grounded.

Hello, the zero line of the distribution box is grounded, to find out the problem, and solve the problem: first check the distribution box, starting from the top of the distribution box, respectively, the insulation resistance between the zero line and the ground wire, measure it, so that you can find out the problem. Once you've identified the problem, set out to solve the neutral grounding problem

The three-phase five-bucket draft line power system connects the neutral line and the ground wire together, and the neutral line is connected to the power strip, so that the distribution box is safer.

Please say about the method of grounding the zero line of the distribution cabinet, thank you.

The neutral line is connected to the neutral point of the transformer, if the neutral point of the transformer is not grounded, when the three-phase load is balanced, the neutral point of the transformer is 0 potential, which is no problem, but in fact, it is impossible to make the three-phase load completely balanced.

If the three-phase load is unbalanced, the neutral point of the transformer will drift, that is, the potential of the neutral point of the transformer is no longer 0, so that the potential on the neutral line is not 0, which is often said to be the neutral line is charged, which is very dangerous.

The ground wire is directly connected to the earth, while the neutral wire is directly grounded at the transformer end, and the neutral wire and the ground wire are both connected to the earth, that is, the neutral wire and the ground wire are indirectly connected.

Line protection is divided into two types: protection zero and protection grounding

If the neutral point (neutral line) of the transformer is connected to the ground wire, it is called protection zero; The protection zero connection is generally used in three-phase circuits, and when the neutral line is used as the protection line, it has a subversive change from the function of the neutral line in the traditional cognition.

If the neutral point (neutral line) of the transformer is not connected to the ground wire, it is called protective grounding. Protective grounding is the most common among ordinary people, if it belongs to the buried brother protection grounding, then the zero line behind the leakage and the ground wire are connected, and the leaky bend will trip the electrical appliance.

The practice of repeated grounding of the zero line and ground wire of the primary distribution cabinet is dear, although theoretically speaking, the two-pole distribution box does not need to be repeatedly grounded, but in order to ensure safety, the secondary distribution box can do repeated grounding should be done. Because when the original ground wire is disconnected or other faults, the protection effect will be lost, and then the repeated grounding will play a protective role, so as to ensure the safety to a large extent. The following chain culture method can be considered for repeated grounding:

1. It is connected to the grounding grid by the grounding flat steel (concealed) or galvanized screws (surface-mounted) on the distribution box shell. 2. The internal metal conductive part of the distribution box is connected to the PE, such as the component mounting plate, Xunlu door, secondary door, etc., all of which need to be connected together. 3. Use the grounding body connected by the foundation steel bar of the building to lead it to the entrance of the distribution box.

Many people don't know a lot about the distribution cabinet, so why is the zero line of the distribution cabinet grounded?

First, why the open wire of the distribution cabinet is grounded?

This is due to the fact that the neutral line in the three-phase electricity is pulled out by the neutral point of the transformer, and the neutral point of the transformer needs to be grounded, that is, the ground wire and the neutral wire are connected at the neutral point of the transformer, so the neutral wire and the ground wire are connected.

2. How to use the distribution cabinet safely.

1. The power distribution cabinet is the control center of the motor, if you want the power distribution system to operate normally, then you can not swing the switch arbitrarily, especially the power distribution board, when it is in the power distribution state, such as the speed of the power screen and the switch of the air circuit breaker are the top priority.

2. The generator set needs to be connected to the middle of the distribution cabinet and then started, and the speed of the power screen switch needs to be first slow and then fast, and the valve can be opened for power transmission only after the working state is normal, that is, the voltage frequency reaches the specified value.

3. Before the motor stops working, the load of the generator needs to be disconnected to ensure that there is no load before stopping.

4. When the generator of the distribution cabinet is working, the engineer personnel must pay full attention and be cautious when operating, so as to ensure the normal operation and avoid accidents.

3. What is the difference between the column head cabinet and the distribution cabinet?

Their position and function are different, the column head cabinet is usually located at the top of the equipment room equipment, it can also generate strong and weak two cabinet types, mainly used for diversion, coordination, monitoring circuit, and the distribution cabinet is the lowest level of equipment in the power distribution system, mainly for protection, monitoring, control.

I summarize: the above is the distribution cabinet zero line grounding, from the above article we can see that in order to use the distribution cabinet safely, we must strictly implement the provisions when operating, so as to ensure that the circuit in the safe operation of the while avoiding the occurrence of many crises, saving a lot of manpower and material resources, but also to protect our personal safety, I hope to help everyone.

Summary. The ground wire and the neutral wire are reversed, which will cause the circuit to be short-circuited or the neutral wire to be burned. If the zero wire is burned, the shell of the appliance is equivalent to the fire wire, and once the human body comes into contact, it will be subjected to electric shock, which poses a threat to personal safety.

Hello, I am happy to answer your questions, will the zero line and the ground wire of the standby cabinet fall to the high-voltage line switch The answer to your question is: No, the orange switch (leakage protector) will trip, if it is not good to distinguish the zero line and the ground wire, you can use the shake meter to measure and destroy it, the grounding resistance value of the ground wire should be 0, and the grounding resistance of the neutral wire should be greater than the megaohm.

The ground wire and the neutral wire are reversed, which will cause the circuit to be short-circuited or the neutral wire will burn out the width of the skin. If the zero wire of the grip is burned, the shell of the electrical appliance is equivalent to the fire wire, and once the human body touches the limb light, it will be subjected to electric shock, which poses a threat to personal safety.

Summary. Hello, dear, it is a pleasure to serve you, when there is no grounding wire, the electrical connection between the neutral line and the distribution cabinet is often referred to as the "TN-S" system. In this system, the neutral point of the power transformer is connected to the ground of the building by a zero-sequence current protector (RCD), and at the same time the electrical power is safely transmitted to the building by means of an insulated winding protector (mainly used for short-circuit protection).

In a TN-S system, the neutral and ground wires are physically separated, but they are electrically connected. The reason for this is that when there is a fault in electrical equipment, such as a decrease in insulation or a short circuit, a relatively large fault current occurs. If there is no neutral to ground, such currents can accumulate on the surface of the appliance and create a direct life-threatening shock hazard.

Hello, dear, it is a pleasure to serve you, when there is no grounding wire, the electrical connection between the neutral line and the distribution cabinet is often referred to as the "TN-S" system. In this system, the neutral point of the power transformer is connected to the ground of the building by a zero-sequence current protector (RCD), and at the same time, an insulated winding protector (mainly used for short-circuit protection) is used to safely transmit electrical power to the building. In a TN-S system, the neutral and ground wires are physically separated, but they are electrically connected.

The reason for this is that when electrical equipment fails, such as reduced insulation or short circuits, a relatively large fault current occurs. If there is no neutral to ground, such currents can accumulate on the surface of the appliance and create a direct life-threatening shock hazard.

Therefore, in the absence of the ground line, the zero line and the distribution cabinet need to be connected to ensure the safe work and personal safety of the electrical equipment. In order to further improve safety and reliability, buildings and electrical equipment should be designed, installed and maintained in accordance with relevant national or regional standards.