Basic requirements for electrical safety

The safe safety of underground electrical production is also a crucial point. How to ensure electrical safety? Let's look at the basic requirements for ensuring electrical safety. Including two aspects, one coal mine under special working conditions, and second coal mine power supply system of basic requirements.

1. Special working conditions in coal mines

(1) There are explosive media such as gas and coal dust in the mine atmosphere. When the content reaches a certain amount, when electrical equipment or cable wires are sparked, a vicious accident such as burning or explosion will occur.

(2) Downhole roadways and electromechanical diverticulums often have dripping water, water spray, and even a large amount of water, and the relative humidity of the air is generally above 90%. Moreover, due to the influence of mine pressure, roofing and chipping accidents often occur, and electrical equipment, especially cables, are easily damaged by smashing, bumping, squeezing, and pressing. Therefore, personal electric shock accidents are prone to occur. Faulty sparks such as leakage sparks or short-circuit arcs are sources of electrical fires such as gas, coal dust, or explosions.

(3) Some underground electromechanical chambers and roadways have higher temperatures, and electrical equipment has poor heat dissipation conditions.

(4) The electrical equipment of the mining face moves frequently and often starts, and the load of the electrical equipment changes greatly.

(5) All power outages in the underground will cause such serious accidents as flooding mines, gas accumulation, personnel trapped or suffocating, and even gas or coal dust explosions.

2. Basic requirements for coal mine underground power supply system

(1) Coal mines belong to a class of users, and power outages will cause casualties and major production losses.

(2) The coal mine underground supply (distribution) power grid is not allowed to adopt the neutral point grounding working mode, and the neutral point of the underground distribution transformer is not allowed to be directly grounded. It is strictly forbidden to directly supply the transformer or generator directly grounded by the ground neutral point to the underground.

(3) The short-circuit capacity of the mine grid, the old mine is generally limited to 50mVA; the new mine is no longer subject to this restriction (generally 100mVA or 200mVA).

(4) In the mine high-voltage power grid, the single-phase grounding capacitor current must be limited so that it does not exceed 20A.

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