Why do you need to use three specializations and two locks in coal mines?

Just look at this!

"Three specializations" refers to the principle of using special transformers, special switches and special lines for the power supply of local ventilators in underground mines mined by underground workers to ensure that the power supply is relatively stable and that the wind does not stop at the head. "Two lockouts" refer to the gas electric lockout and wind power lockout of the excavation face. Among them, the gas electric lockout means that when the gas concentration of the excavation face exceeds the limit, the sound and light alarm and automatically cut off the power supply of the head-on controlled equipment of the working face; Wind power lockout refers to the automatic cutting off of the power supply of all equipment in the excavation face (except for the backup fan power supply) when the main ventilator of the local area stops running or the air volume of the duct falls below the specified value.

Briefly speaking, it refers to: three specializations, namely: special transformer, special line, special switch.

Two lockouts are: wind power lockout, gas electric lockout.

Legal analysis: The "three specializations" in coal mines refer to: special switches, special transformers, and special lines. "Two lockouts" refer to: wind power lockout, gas electric lockout.

Legal basis: In accordance with Article 1 of the Coal Mine Safety Regulations, these regulations are formulated in accordance with the Coal Law, the Mine Safety Law, the Work Safety Law, the Law on the Prevention and Control of Occupational Diseases, the Regulations on Coal Mine Safety Supervision and the Regulations on Work Safety Permits, etc., in order to ensure the safety of coal mine production and the personal safety and health of employees, and to prevent coal mine accidents and occupational disease hazards.

Three specializations and two locks - special transformer, special switch, special line; Wind power lockout, gas electric lockout.

Special transformers, special switches, and special lines are called "three specializations". "Two lockouts" refers to wind power lockouts and gas electric lockouts. The function of wind power lockout is to immediately cut off the power supply in the air supply area when the local ventilator stops running.

The function of the gas electric lockout is that before the local ventilator is started, if the gas in the air supply area exceeds the limit, the local ventilator will not start, and the local ventilator will be activated after the lockout is released, and the gas can only operate normally after the gas is discharged. Under normal operation, the gas exceeds the limit at the detection point in the air supply area, and the power supply in the corresponding control area is cut off, and the local ventilator runs as usual.

"Three specializations" refers to gas emission areas, high gas mines, coal (rock) gas (carbon dioxide).

In the protruding mine, the local ventilator of the excavation face implements special transformer, special switch and special line power supply.

According to the "Coal Mine Safety Regulations".

It is stipulated that in the gas injection area, high gas mines, and coal and gas outburst mines, special transformers, special switches, and special lines must be set up for the power supply of local ventilators at the excavation face.

The electrical equipment of the local ventilator and the working face must be equipped with wind power locking and gas electric locking devices to ensure that when the local ventilator stops running or the gas in the roadway exceeds the limit, the power supply of the electrical equipment in the roadway can be automatically cut off immediately to prevent the occurrence of accidents.

Wind power locking is to use two magnetic starters for interlocking control, one of which is connected to the ventilator, and the other is connected to the electrical equipment of the excavation face, so as to realize the first ventilation and then power transmission, and when the fan stops, the power supply of the excavation face is also cut off at the same time.

Three specializations and two locks.

"Three specializations" refers to the implementation of special transformers, special switches, and special lines for power supply by local ventilators of the excavation face in gas emission areas, high gas mines, and coal (rock) gas (carbon dioxide) outburst mines.

"Two lockouts" refer to the gas electric lockout and wind power lockout of the excavation face. Among them, the gas electric width and land lockout means that when the gas concentration of the excavation face exceeds the limit, the sound and light alarm will automatically cut off the power supply of the head-on controlled equipment of the working face; Wind power lockout refers to the automatic cutting off of the power supply of all equipment in the excavation face (except for the backup fan power supply) when the main ventilator of the local area stops running or the air volume of the duct falls below the specified value.

Three protections The "three protections" of underground low-voltage safe power supply are: protective grounding, leakage protection and short-circuit protection.

Protective grounding: refers to the use of conductors to connect all uncharged exposed metal parts of electrical equipment with grounding electrodes buried in the ground. In this way, the voltage to the ground generated by the leakage of electrical equipment is reduced, and the degree of reduction is related to the quality of the protection device.

Only when the requirements are met can it play a good role in protection.

Leakage protection: It is to install a leakage relay in the power supply system. Its functions are: (1) when the power supply system leaks, it can quickly cut off the power supply, that is, to carry out insulation monitoring; (2) When the human body is electrocuted, cut off the power supply when the human body is not perceived.

Short-circuit protection: It is to connect fuses, current-limiting relays, over-current relays, etc. in the circuit. Its function is to automatically cut off the power supply when the working current of the line and electrical equipment exceeds the specified allowable value, and protect the line and electrical equipment

Special switches, transformers, and lines are locked out: wind power and gas.

Three major protections: grounding, leakage, overload, 1, two lockouts, gas electric lockout, wind power lockout, three special is used for the wind turbine special switch, special transformer, special line, the three major protections of power supply are leakage protection, overload protection, grounding protection, 0,

The third specifically refers to the underground equipment with special transformers, special lines, and special switches. Two lockouts refer to wind power lockouts and gas electric lockouts.