Dry power transformer for hatch winding iron core

Abstract

A high performance dry power transformer is characterized in that an iron core frame is configured that a two-square-shaped rectangular frame is constructed by abreast arranging two open rolled iron cores which has square shapes and indent semiellipse sections, and which is formed 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, and the two-square-shaped rectangular frame is packaged in an open rolled iron core rectangular frame with a convex semiellipse section, 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 or polygon cylinders. Because of the open characteristic of the iron core, the coil can be winded singly, and the coil can be mounted or replaced by opening the iron core at a U-shaped position of an open slot during production and maintaining; in this way, a triphase epoxide resin dry transformer and a non-enveloped insulative dry transformer with a capability of 30 KVA to 3450 KVA can be produced.

Description

Technical field [0001] The invention relates to a high-performance dry-type power transformer with an applicable capacity of 30-3150 kVA. Background technique [0002] Dry-type power transformers are mainly composed of iron cores and coils. The iron cores of dry-type power transformers in production are laminated and wound core structures. Laminated structure iron core, the iron core formed by stacking silicon steel sheets has many oblique seams at the edge joints of each piece, which leads to the increase of reluctance and iron loss, and the excitation current of the transformer is also increased and reduced. The power factor is seriously affected, which seriously affects the power supply quality of the power grid; the joints of the transformer core will also cause up to 45-70 decibels of transformer operation noise; Good performance and low noise, but due to the limitation of the production process, it cannot meet the conditions for the production of dry-type power transf...

AI Technical Summary

Problems solved by technology

Laminated structure iron core, the iron core formed by stacking silicon steel sheets has many oblique seams at the edge joints of each piece, which leads to the increase of reluctance and iron loss, and the excitation current of the transformer is also increased and reduced. The power factor is seriously affected, which seriously affects the power supply quality of the power grid; the joints of the transformer core will also cause up to 45-70 decibels of transformer operation noise; Good performance and low noise, but due to the limitation of the production process, it cannot meet the conditions for the production of dry-type power transformers, and there are also defects such as difficult maintenance and uneconomical use, which also restricts the promotion and application of wound iron cores in dry-type transformers.

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