Winding method for oval multi-layer coil of transformer

Abstract

The invention discloses a winding method for an oval multi-layer coil of a transformer. The winding method comprises a winding process of a low-voltage coil and a winding process of a high-voltage coil. The winding process of the low-voltage coil comprises the following steps of bending the start of a wire to form a 90-degree angle, sparsely winding an end insulation made of paperboard strips on the first turn of the wire, placing the start into a notch of a baffle of a winding mold, and temporally fixing the start on the winding mold by a contraction band; winding the first turn of the wire of the innermost layer of the coil, circumferentially and uniformly placing four to six cotton tapes for tensioning under the wire while winding, binding the first turn of the wire and the end insulation together by the cotton tapes for tensioning by using a splayed binding method, turning the cotton tapes for tensioning to the upper side while winding the second turn of the wire, and while winding the third turn of the wire, turning the cotton tapes for tensioning to the lower side and tensioning the cotton tapes after pressing the cotton tapes under the other wires. According to the winding method of the invention, the mechanical strength of the coil can be improved under the premise of ensuring electric field intensity of each part of the winding.

Description

technical field [0001] The invention relates to a winding method of an elliptical multilayer coil of a transformer. Background technique [0002] With the increasingly fierce competition in the transformer industry, in order to reduce costs, the circular core and coil structure of the stacked core oil-immersed distribution transformer has been optimized into an elliptical structure, and the use of elliptical layered coils has become a transformer manufacturer. a common phenomenon. Although the elliptical coil can effectively reduce the use of raw materials, when the elliptical coil is wound, the mechanical strength of the coil is lower than that of the circular coil due to the uneven force on the insulating cardboard inside the coil. Contents of the invention [0003] The object of the present invention is to overcome the defects of the prior art and provide a winding method for transformer elliptical multilayer coils, which can improve the mechanical strength of the coil...

AI Technical Summary

Problems solved by technology

Although the elliptical coil can effectively reduce the use of raw materials, when the elliptical coil is wound, the mechanical strength of the coil is lower than that of the circular coil due to the uneven force on the insulating cardboard inside the coil.

Images