(1) Protective general transformer
It can be installed mine general type transformer in dangerous places without coal dust and methane explosions, for electric drive and lighting. The transformer is oil-immersed and has the same basic structure as the power exchanger. However, there are electric rope boxes on both sides of the box wall, and the cables are taken out once and twice. The primary side is provided with non-excitation voltage regulation, the voltage regulation range is plus or minus 15%, and the secondary winding leads out six terminals, which can be converted into YD to obtain 690/400 or 1200/690v. To adapt to the mine and use it, the transformer structure is required. Sturdy and low profile. The transformer does not have an oil conservator, and there is a proper space above the oil level in the fuel tank to prevent excessive pressure in the tank when the vent hole on the tank is blocked. Fuel tank mechanical strength
It should withstand a pressure of 98 kPa (lkgf/cm2) without permanent deformation. Measures to prevent condensation of water should be taken inside the cover.
(2) Mine explosion-proof small transformer
Mine explosion-proof transformers are used in places with explosion hazards in coal mines. These transformers are made in a dry seal. All joint surfaces of the casing are made according to the explosion-proof requirements and should withstand an internal pressure of 784 kPa (8 kgf/cm). The cable for the small transformer for lighting is led out through the outlet sleeve. A rubber gasket is placed inside the outlet sleeve, and the cable passes through the gasket. After the outlet sleeve is tightened, the gasket compresses the cable to ensure sealing. The casing is welded with a drag for horizontal placement and dragging, or it can be placed upright.
(3) Mine explosion-proof mobile substation
Explosion-proof transformers with a capacity of 1OOkVA or more are often combined with explosion-proof switch boxes to form a flameproof mobile substation. KSGZY type (Z is a combination, Y is a mobile type) The outer casing of the low-voltage electric switch and the high-voltage load switch are all welded by steel plates. They are respectively bolted and fixed to the outlet box on the high and low voltage box covers at both ends of the dry type transformer, and the joint is an explosion-proof surface.
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