How to arrange the safety exit of the underground substation?

At least 2 clear safety exits must be maintained, one to the return airway and the other to the inlet airway.

1. The principle of determining the location of the underground main substation.

1.Try to be in the center of the load to save cables and reduce power loss voltage loss.

2.Cables should be easily transported in and out of the line and equipment for the installation and laying of electrical equipment.

3.The substation should be well ventilated to dissipate heat and reduce gas concentration.

4.The roof and bottom plate of the substation should be firm and free of water to prevent damage and moisture to the electrical equipment.

Generally, the main substation is located near the underground parking lot and adjacent to the first water pump room.

The Coal Mine Safety Regulations stipulate that the power supply line of the underground main substation shall not be less than two circuits, and the remaining circuits shall be able to bear the power supply of all the underground loads when any circuit stops supplying power.

The layout of the chamber and equipment of the underground main substation.

The layout of the underground main substation shall comply with the provisions of the "Coal Mine Safety Regulations" on the underground electromechanical chamber, and meet the requirements of fire prevention, waterproofing and ventilation.

The equipment layout should meet the requirements of "two separation" and "three retention".

1) Fire prevention in the chamber of the underground main substation.

1) And install a fireproof iron door that opens outward, when the iron door is open, it shall not obstruct the roadway traffic, and the iron door should be equipped with a ventilation hole that is convenient for closing, so as to isolate ventilation when preventing fire and extinguishing fires.

2) The iron fence door that opens outward can be added to the door, but it must not hinder the opening and closing of the iron door, so that ventilation can be ensured, and the idle personnel can be prevented from entering the main substation.

3) The chamber should be made of ballast, and the roadway within 5m from the fireproof iron door at the exit of the chamber should be built or supported with non-combustible materials.

4) There should be a dry fire extinguisher and a sand box to extinguish electrical fires in the chamber.

2) Ventilation of the underground main substation chamber.

In order to ensure the ventilation of the chamber, when the length of the chamber of the main substation exceeds 6m, an outlet for easy ventilation should be opened at both ends of the chamber to ensure that the temperature in the chamber can not exceed the nearby roadway 5.

3) Waterproofing of the chamber of the underground main substation.

1) In order to prevent the underground parking lot or alley from backfilling water to the main substation and the main drainage pumping station, the ground of the underground main substation and the main drainage pumping station should be higher than the floor at the connection between the underground parking lot and the underground parking lot.

2) There should be no dripping in the chamber.

4) Equipment layout of the underground main substation.

Two separation: transformer and distribution equipment are arranged separately.

High and low voltage equipment are arranged separately.

Three: there is a maintenance channel between the equipment and the wall and the equipment;

There is an operation channel on the front of the high-voltage switch;

Equipment should have a spare spot at 20% of the maximum number.

Coal mine substation.

It is also a substation, so he not only has to comply with the safety regulations of ordinary substations, but also has some peculiarities.

1: Safe operation, installation of five defenses.

And strictly operate in accordance with the five preventions, control the five prevention keys, and prevent injuries or mistakenly cutting important loads.

2: Equipped with self-throwing or quick-cutting device, and ensure that the standby self-throwing (quick-cutting) is always in the state of charging completion, so that the important load (exhaust fan, blower.

etc.) uninterrupted power to ensure the underground exhaust and the safety of transporting people.

3: For the movement of the coal seam, the cable is also often moved, so it is necessary to overhaul the cable frequently to prevent leakage from hurting people, 4, the use of explosion-proof equipment (explosion-proof transformer, explosion-proof secondary power equipment) to prevent the expansion of faults.

5. Many underground substations are cascaded.

Therefore, it is difficult to meet the basic requirements of protection, rapidity and selectivity by using general comprehensive protection equipment, so the relatively new system --- digital substation is selected to solve this problem. In particular, the comprehensive insurance equipment specially designed for coal mines.

6: The location of the substation must be safe, and the problems such as water leakage must be completely eliminated, and 7: It is easy to heat up.

Install temperature probes and monitor them, such as transformers, cable joints, switch joints, etc., and solve them as soon as possible once the heat is serious