Air duct structure for cast coil and manufacturing method for air duct structure

Abstract

The invention relates to an air duct structure for a cast coil and a manufacturing method for the air duct structure and belongs to the technical field of production of transformers. The technical scheme is that: the manufacturing method comprises the following steps of: 1, after a wire part (6) of the coil is wound, placing a plurality of airway plates (9) outside the wire part (6), directly winding an outer mixed layer (3) consisting of glass fiber grids and glass fiber woven belts, and casting epoxy resin on the coil; and 2, after casting is finished, drawing out the airway plates to form a barrel-shaped resin layer with an airway structure outside the coil. The invention has the advantages that: compared with the air duct structure of an immersion dry time transformer, the air duct structure for the cast coil has the advantages of attractive and clean appearance, convenience for process, no occurrence of dispersing or dropping off and the like; and the resin layer is a good insulating material, so when the air duct is wound outside the cast coil, the resin layer like a set of insulating cylinder is added outside the coil, the insulating structure of the coil is enhanced, and the insulating level of the transformer is enhanced.

Description

technical field [0001] The invention relates to a structure of an air guide tube for pouring coils and a manufacturing method thereof, and belongs to the technical field of transformer production. Background technique [0002] In recent years, in the field of dry-type transformer technology, the forced-air-cooled impregnated dry-type transformer with air guide structure has shown a rising trend. Forced air-cooled transformers are equipped with corresponding windshields and air ducts, coupled with top fans and bottom fans, which can greatly enhance the heat dissipation capacity of the impregnated dry-type transformer. The airflow generated by the fan all passes through the air guide tube with a small air gap, so the airflow has a high wind pressure and wind speed, and the heat dissipated on the surface of the transformer coil exchanges heat with the outside through this high-speed airflow. In the impregnated dry-type transformer, the line cake is directly placed on the insul...

AI Technical Summary

Problems solved by technology

In the impregnated dry-type transformer, the line cake is directly placed on the insulation stay, and the insulation material with pre-preg effect is wound on the outside of the stay, and then dried and heated to form the air guide. The problems are: Inconvenient to process, easy to disperse or fall off, etc.

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