Dry-type transformer for hatch winding iron core with oval-shaped cross section

Abstract

The invention relates to a dry transformer, characterized in that an iron core frame is formed by machining and winding silicon steel strip materials via circular, elliptical, tridimensional trigonal open iron core winders which are provided in the invention with the application number of 20060029267.9, sections of three columns of the iron core are butt-connected by two indent semiellipses and a convex hemicycle; all of the sections of three columns of the iron core and the section of the whole iron core are ellipses, step shapes and polygons. Compared with a non-open rolled iron core dry transformer with a circular section, the dry transformer of the invention has shorter magnetic circuit, higher power factor, small volume, better processing performance, lower no-load loss and no-load current, reduced noise, and 10% or more reduced manufacturing cost; the dry transformer of the invention has the coil capable of being winded singly, is easy to manufacture and maintain, and has a capability reaching 30 KVA to 3450 KVA.

Description

Technical field [0001] The invention relates to a high-performance dry-type power transformer. Background technique [0002] At present, most of the iron cores used in dry-type transformers are laminated structures, which are formed by stacking silicon steel sheets. Since the laminated iron core has many oblique seams at the joints of each layer, the reluctance and iron loss increase, the excitation current of the transformer also increases, the power factor is reduced, and the power grid is seriously affected. quality of power supply. Transformer seams also cause problems with loud operation. In order to overcome the defects of the above-mentioned laminated iron cores, the development trend in recent years is to use wound iron cores to make dry-type transformers. However, due to the seamless structure of wound iron cores, there are also many problems, such as: transformer coils need special tools when winding. Winding equipment, and winding with iron core, the winding pr...

AI Technical Summary

Problems solved by technology

[0003] The present invention designs an elliptical open wound core dry-type transformer. Due to the opening characteristic and the circular structure of the cross section, it not only solves the low performance of the laminated iron core dry-type transformer, but also solves the problem of the wound core dry-type transformer. Production process and manufacturing problems

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