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

Abstract

Provided is an open rolled iron core oil-immersed type power transformer with an elliptical section. According to the invention, defects in the laminated iron core performance and jointless rolled iron core manufacturing technology are thoroughly solved. The transformer is characterized in that an iron core frame is manufactured by 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; the sections of three columns of the iron core are formed by butt connecting two indent hemicycles and a convex hemicycle, the sections of three columns of the iron core after assembling are ellipse, step-shape (internal ellipse) or polygon (internal ellipse) structures. Compared with a non-open rolled iron core dry transformer with a circular section, the oil-immersed type power 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 transformer of the invention has the iron core with open characteristic, thereby, the coil can be winded singly, the transformer is easy to manufacture and maintain, and is suitable for the capability of 30 KVA to 3450 KVA.

Description

Technical field [0001] The invention relates to a high-performance power transformer. It belongs to the field of electrical technology. Background technique [0002] Among the iron cores, coils and oil tanks of power transformers, most of the iron cores of oil-immersed transformers with a capacity of more than 800kVA are still using a laminated technical structure formed by stacking silicon steel sheets. Because there are many oblique seams at the joints of each layer of the laminated iron core, the reluctance and iron loss increase, the excitation current of the transformer also increases, the power factor is reduced, and the power supply quality of the power grid is seriously affected; The seams of the laminated iron core also cause the transformer to run noisy. The more advanced technology adopts the coiled iron core technology, which overcomes the defects of the laminated iron core. The coiled iron core improves the performance of the transformer, and has the advantage...

AI Technical Summary

Problems solved by technology

However, due to the seamless structure design of the coiled iron core, there are still many problems that are difficult to overcome.

For example, the process of manufacturing transformer coils requires special winding equipment with iron cores for winding. The winding process is difficult, complicated, and production efficiency is low, resulting in limited production capacity.

In particular, the winding and varnish manufacturing of large and medium-sized transformers cannot be solved; user maintenance is also very difficult. Once the transformer coil fails, the entire transformer will be scrapped; this restricts the promotion and use of coiled iron cores.

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