Broken-yoke iron core of three-phase amorphous alloy transformer

Abstract

The invention discloses a broken-yoke iron core of a three-phase amorphous alloy transformer. The broken-yoke iron core comprises three unit iron cores, wherein upper unit iron yokes on the unit iron cores can be opened; each unit iron core is formed by nesting multiple single iron cores one by one, the cross section of the single iron core which is positioned at the innermost side of each unit iron core is in an isosceles trapezoid shape, the cross section of the single iron core which is positioned at the outermost side of each unit iron core is in a trapezoid shape, the cross section of the single iron core which is positioned in other position of each unit iron core is in a combination shape of a parallelogram shape, a trapezoid shape and an R shape, and the cross sections of each unit iron core column and each unit iron yoke are enabled to be basically in semicircular shapes. According to the broken-yoke iron core disclosed by the invention, each of three iron core columns is respectively formed by carrying out mutual butt joint between the diameter of the cross section of a left unit iron core column of one unit iron core and the diameter of the cross section of a right unit iron core column of the other unit iron core, and the cross sections of the three iron core columns are basically in circular shapes. The broken-yoke iron core disclosed by the invention has the advantages that transformer coils can be independently coiled, and great convenience is provided for the sleeving of the transformer coils.

Description

technical field [0001] The invention relates to a broken yoke core of a three-phase amorphous alloy transformer. Background technique [0002] Existing three-phase amorphous alloy (silicon steel) transformer core columns all have a rectangular cross-section, and the core structure is mostly four-frame and five-column or three-frame and three-column. The iron core structure of this transformer has many disadvantages. First, the rectangular cross-section of the iron core column consumes 11.1% more copper than the circular cross-section in the case of the same number of coil turns; secondly, each transformer has more single-frame iron cores (by Composed of single row or double row), the oblique seams at the disconnection of the iron yoke will increase, and the reluctance will also increase accordingly. When the transformer is running, under the action of the AC magnetic field, these seams are very likely to cause multiple Vibrates at a low frequency, which creates a lot of noi...

AI Technical Summary

Problems solved by technology

The iron core structure of this transformer has many disadvantages. First, the rectangular cross-section of the iron core column consumes 11.1% more copper than the circular cross-section in the case of the same number of coil turns; secondly, each transformer has more single-frame iron cores (by Composed of single row or double row), the oblique seams at the disconnection of the iron yoke will increase, and the reluctance will also increase accordingly. When the transformer is running, under the action of the AC magnetic field, these seams are very likely to cause multiple Low-frequency vibrating, which makes a lot of noise

In addition, the magnetic flux density in the iron yoke of this iron core structure is 1.155 times the magnetic flux density in the iron core leg, so it also leads to an increase in the no-load loss of the iron core

[0003] In addition, the existing triangular wound core transformers are all closed, and the coil winding requires a professional winding machine, which makes the equipment investment of the production enterprise relatively large, the manufacturing efficiency is low, the processing technology is complicated, and the coil replacement is complicated.

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