What is a short circuit in ground current, and the details are ???

Handling of line ground faults.

1. In the power grid where the neutral point is not grounded or grounded by the arc suppression coil, when it is found that there is grounding, the fault point of the grounding should be quickly found while running with grounding, and strive to cut off the grounding fault before it develops into a phase-to-phase short circuit.

2. When looking for line grounding faults, it should generally be carried out in the following order:

1) Divide the power grid into several parts that are not directly connected to each other electrically;

2) Check the lines with parallel circuits or other power supplies;

3) Check the feeder lines with many branches, the longest, the lightest load, and the least important;

4) Check feeders with fewer branches, shorter, heavier loads, and more important;

5) Check the power distribution devices connected to the bus (such as lightning arresters and transformers, etc.);

6) Check the power supply (transformer, etc.);

7) Check the bus system by switching the spare busbar.

3. All work looking for grounding should wear rubber insulating gloves, wear rubber insulated shoes, and avoid touching the grounded metal.

For small current grounding systems, a two-phase short circuit or a two-phase ground short circuit, regardless of whether it is grounded or not, can be called a phase-to-phase short circuit.

Earthing refers to the neutral point of the power system and electrical installation, the exposed conductive part of the electrical equipment and the external conductive part of the device connected to the earth through conductors. It can be divided into working grounding, lightning protection grounding and protective grounding.

The role of grounding

1. Grounding is an electrical safety measure taken to ensure the normal operation and personal safety of electrical equipment, which is realized by connecting the metal wire with the grounding device, and the commonly used ones are protective grounding, working grounding, lightning protection grounding, shielding grounding, anti-static grounding, etc.

2. The grounding device introduces the leakage current, electrostatic charge and lightning current that may be generated on electrical equipment and other production equipment into the ground, so as to avoid personal electric shock and possible fire, ** and other accidents.

3. Prevent people from being subjected to electric shock.

Make a good metal connection between the uncharged metal part of the electrical equipment and the grounding electrode under normal conditions to protect the safety of the human body. For electrical equipment with grounding device, when the insulation is damaged and the shell is live, the grounding current will flow along the grounding electrode and the human body at the same time.

4. Ensure the normal operation of the electrical system.

The grounding of the power system is generally neutral, so the potential between the neutral point and the ground is close to zero. When the phase wire touches the shell or ground, the voltage of the other two opposite to the ground will increase to several times of the phase voltage in the neutral insulation system; In a system with a neutral point grounded, it is close to the phase voltage.

Ground short-circuit current refers to the grounding current that causes a short-circuit in the system due to the grounding of the system. In the grounding system, one phase is grounded, which is more likely to constitute a system short circuit. The ground current at this time is called the ground short-circuit current. In a high-voltage grounding system, the ground short-circuit current can be significant.

Interphase short circuit refers to the phenomenon that the insulation between the two phase wires in the three-phase AC power supply system is destroyed, resulting in electrical contact, and there will be a large short-circuit current at this time, which is a serious power accident.

A short circuit to ground is an electrical fault that often occurs in the power system. It refers to the normal electrical equipment that is suddenly short-circuited to the ground. This type of short circuit is usually caused by an insulation failure between two or more conductors, causing current to flow from the circuit to ground.

This condition can lead to electric shocks and other injuries to electrical equipment and personnel, so it must be dealt with promptly.

Type of ground short.

There are many different types of short-to-ground circuits, the most common of which are single-phase short-to-ground and three-phase short-to-ground. Single-phase short-to-ground or former refers to a three-phase circuit in which one of the lines is shorted to ground. A three-phase ground short circuit refers to a short circuit of three circuit lines to the ground at the same time.

This condition usually results in a very high current passing through a short circuit, which can cause a lot of damage.

Hazards of short circuit to ground.

A short circuit to ground can cause a lot of hazards, mainly including the following:

1.Damage to electrical equipment: A short circuit to ground may result in damage or complete damage to electrical equipment. Therefore, if not detected and dealt with in time, the cost of equipment repair and replacement will be high.

2.Electric Shock Injury: If a short circuit in ground transmits a large amount of current to the human body, it can cause electric shock injury. The situation is very dangerous and can lead to the death of people.

3.Production Stoppage: If a short circuit to ground causes equipment to fail to function properly, it can lead to production stoppage. This will have a great impact on the production and economic efficiency of enterprises.

How to prevent a short circuit to ground.

Preventing a short circuit to ground can be started from the following aspects:

1.Check the insulation of electrical equipment to ensure that the insulation board does not crack and does not leak.

2.Install fibrillation grounding protections such as grounding switches and grounding resistors.

3.Regularly inspect electrical equipment and circuits to detect and deal with potential faults in a timely manner.

4.Train employees on electrical safety knowledge and improve their safety awareness and operational skills.

In conclusion, a short circuit to ground is a very dangerous electrical fault that must be taken seriously. Only through scientific and reasonable preventive measures can we effectively reduce the incidence of electrical safety accidents and ensure the safety of personnel and equipment.