Transformer body structure of oil immersion type power distribution transformer

Abstract

Disclosed is a transformer body structure of an oil immersion type power distribution transformer. Cross sections of a low-voltage winding and a high-voltage winding are similar to an elliptic shape; a section of a single column of an iron core is formed by rectangular sections in a stacking manner; external patterns of all rectangular sections are similar to the elliptic shape; the similar elliptic shape consists of four sections of circular arcs and four sections of straight lines; the four sections of circular arcs comprise two sections of circular arcs which are arranged longitudinally and oppositely with the same radius, and two sections of circular arcs which are arranged transversely and oppositely with the same radius; the centers of the two sections of circular arcs which are arranged longitudinally and oppositely are positioned on a vertical straight line; the centers of the two sections of circular arcs which are arranged transversely and oppositely are overlaid, and are positioned on the vertical straight line where the centers of the two sections of circular arcs which are arranged longitudinally and oppositely are located; and the adjacent circular arcs are in tangent direction through the straight lines. The similar elliptic shape adopted by the structure is formed by the four sections of circular arcs and four sections of straight lines in a transitional tangent manner, and is made by simulating an expansion shape of a winding in a winding process, so that the mechanical strength of the winding is effectively improved, the anti-short-circuit capability of the transformer is improved, the transformer cost is lowered, and the reliability of the transformer is improved.

Description

technical field [0001] The invention relates to a body structure of an oil-immersed distribution transformer, belonging to the technical field of distribution transformers. Background technique [0002] The distribution transformer market is highly competitive, and reducing the manufacturing cost of transformers has become the primary task of all manufacturers. At present, the measures to reduce manufacturing costs are mainly based on the oblong structure of the iron core and winding. This structure reduces the cost of the transformer by reducing the width of the core window, reducing the amount of main materials. However, the winding cross-section of this structure is oblong, which does not conform to the winding law of the winding. The arc part of the winding can be wound tightly, but the straight part is protruding in the radial direction due to the winding law, and the winding is not tight. Poor short circuit resistance. Although the cost is reduced, the reliability of...

AI Technical Summary

Problems solved by technology

This "smooth transition" structure only uses four tangent arcs, with four centers in total and the radius of the large arc is much larger than that of the small arc. Although it is improved on the basis of the long circle, the The effect is not obvious, and there will still be a bulging phenomenon, causing the outer diameter of the winding to be out of tolerance, the mechanical strength of the winding is low, and the short-circuit resistance is poor.

In addition, the coil is only improved for the winding, and the core is not improved accordingly, so the mechanical strength of the winding cannot be guaranteed

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