Insulation angle ring and manufacturing method thereof for transformer winding

Abstract

The invention discloses an insulation angle ring and a manufacturing method thereof for a transformer winding. The manufacturing method includes folding one side of a small corrugated paper board in 0.5 mm in the size equal to the difference between the height of a winding wire turn and 1-1.5 mm according to the height and the width of the winding wire turn, folding again in the size equal to the width of the winding wire turn, and finally folding third times in the size equal to the height of the winding wire turn to manufacture a U-shaped insulation angle ring. A high-voltage winding end and a wire turn at the tail end are wrapped by several U-shaped insulation angle rings additionally, and the U-shaped insulation angle rings are directly fastened on the inner side or the outer side of the winding wire turn and then sparsely wrap the same. By the insulation angle ring and the manufacturing method thereof, creepage distance between two sides of the wind wire turn is greatly improved by improving small angle rings of the winding wire turn, and operation efficiency is improved.

Description

technical field [0001] The invention relates to the field of power transformer manufacturing, in particular to an insulating angle ring used for transformer windings and a manufacturing method thereof. Background technique [0002] In the prior art, the transformer winding is the "heart" part of the transformer, which not only needs to meet the requirements of mechanical strength, but also requires sufficient electrical strength. Especially for high-voltage products, the distribution of the electric field at the end of the winding is complex, and the maximum field strength of the end outlet is in the oil gap inside the end of the high-voltage coil, which is prone to partial discharge and cause surface discharge. If the end wire has a large arc or additional insulation, the maximum field strength can be weakened, and if an angle ring is added, the creepage distance can be increased. For high-voltage transformers, this method is used to improve the terminal electric field. A...

AI Technical Summary

Problems solved by technology

In order to increase the creepage distance in the compact structure, the small angle rings on the end turns are more and more widely used. Since the existing small angle rings are all L-shaped, if both sides of the turns are wrapped, two The L-shaped corner rings are bound together, and the upper end and the end of the high-voltage winding have to be wrapped for 8~10 sections, which brings great inconvenience to the production.

Images