Method of manufacturing ground-burial type solid insulated transformer

Abstract

A manufacturing method of ground-buried-type solid insulation transformer includes producing a coil form into which an inner window is formed; winding a low voltage coil and a high voltage coil on the coil form to produce a first coil part; winding glass fiber on the first coil part to produce a second coil part and assembling a first mold into the inner window and then pre-heating the second coil part; putting the second coil part into a second mold and injecting epoxy resin and hardener between the second coil part and the second mold, and automatically molding and curing thereof under predetermined speed, vacuum, pressure and temperature to produce a third coil part on outer circumference of which an epoxy layer is formed; separating the first mold from the inner window of the third coil part and then after-treating and curing the third coil part; cooling the after-treated and cured third coil part and sanding and washing the epoxy layer, and applying semi-conductive coating material to the sanded part to produce a fourth coil part; assembling a core to the fourth coil part to produce a fifth coil part and testing the fifth coil part; and connecting the fifth coil part to a conductive mesh and shielding thereof, and then sealing outer side of the fifth coil part and filling silicone or high molecular weight compound between the fifth coil part and a shell to manufacturing the transformer.