Open type: Is a common form of direct contact with the atmosphere, suitable for relatively dry and clean indoor, (ambient temperature 20 degrees, relative humidity should not exceed 85%) , generally have air self-cooling and air-cooling two cooling methods. Closed type: The device is located in a closed shell, not in direct contact with the atmosphere (due to the poor sealing and heat dissipation conditions, mainly used for mining, is explosion-proof type) . CAST TYPE: cast with epoxy or other resin as the main insulation, it is simple structure, small size, suitable for smaller capacity transformers. The iron core is made of high quality cold-rolled grain-oriented Silicon Steel Sheet, and the iron core silicon steel sheet is made of 45-degree inclined joint, which makes the magnetic flux pass along the joint direction of the silicon steel sheet. Winding; Epoxy Filling with Quartz Sand; glass fiber reinforced epoxy Casting (I. E. Thin Insulation) ; Multi-strand glass filament impregnated epoxy winding type (generally used 3, because it can effectively prevent casting resin cracking, improve the reliability of equipment) . The high-pressure winding, generally adopts the multi-layer cylinder type or the multi-layer segmented structure.
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