Encapsulation type and gas-insulated winding type

Core and windings are not immersed in the insulating liquid of the transformer. Dry-type transformers using gas or solid insulating medium. According to their different insulation and cooling structure, dry-type transformers can be divided into immersion,  air circuit breaker  type and gas-insulated winding type and so on. Impregnated winding structure of its type and oil-immersed similar, winding through impregnation. The body  circuit breakers with the external atmosphere, also known as open-type, suitable for relatively dry and clean indoor environment (ambient temperature of +20 ℃, the relative humidity is less than 85%). Cold air from the cooling mode when the capacity of up to several thousand kVA, hair cools up to 10000 kV · A above.