Low-cost and strong short-circuit resistance quasi-ellipse core and its auxiliary calculation method

Abstract

The invention discloses an ellipse-like iron core with low cost and high short circuit resistance capacity, and an auxiliary calculation method of the ellipse-like iron core, and belongs to the technical field of transformers. In order to solve the technical problems, the invention provides the ellipse-like iron core with the low cost and the high short circuit resistance capacity for a distribution transformer and the auxiliary calculation method of the ellipse-like iron core. The product quality is good; and the market competitiveness is high. The iron core adopts the technical scheme that the iron core is sequentially stacked by a plurality of iron core pieces; a cross section of each iron core piece is rectangular; a whole cross section of the iron core is a multi-stage step shape; an external connection figure at a vertex of a multi-stage step of the iron core is ellipse-like; the ellipse-like comprises two oppositely arranged semicircular arcs and two oppositely arranged side long arcs; the two side long arcs are tangently connected with the two semicircular arcs respectively; and circle centers of the two semicircular arcs are located in a vertical center line of the cross section of the iron core. The external connection figure of the iron core is designed into the ellipse-like, so that a sudden short circuit resistance requirement of a state grid distribution transformer can be met; the iron core has the advantage in material saving of a long circular iron core; and preparation of a low pressure mold is facilitated.

Description

technical field [0001] The low-cost quasi-elliptical iron core with strong short-circuit resistance and its auxiliary calculation method belong to the technical field of transformers, and in particular relate to an oil-immersed distribution transformer. Background technique [0002] At present, the State Grid has more and more strict requirements on distribution transformers, among which the requirement of anti-sudden short circuit is especially important. At present, many domestic manufacturers generally use oblong iron cores with great advantages in material saving for such distribution transformers (such as figure 1 shown), but in terms of the dynamic stability of the transformer, the oblong core transformer is worse than the circular (elliptical) core transformer ( figure 2 Standard oval core shown), but round (ellipse) core transformers are more costly. Therefore, mass production of state grid distribution transformers requires a structure that combines the advantage...

AI Technical Summary

Problems solved by technology

At present, many domestic manufacturers generally use oblong iron cores with great advantages in material saving for such distribution transformers (such as figure 1 shown), but in terms of the dynamic stability of the transformer, the oblong core transformer is worse than the circular (elliptical) core transformer ( figure 2 standard oval core shown), but round (ellipse) core transformers are more costly

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