5/7 sloping four-seam lamination mode of three-phase three-limb transformer core

Abstract

The invention discloses a 5 / 7 sloping four-seam lamination mode of a three-phase three-limb transformer core. Each lamination of the core includes a whole iron yoke isosceles trapezoid core lamination, a broken iron yoke isosceles trapezoid core lamination, a broken iron yoke right-angled trapezoid core lamination, a central limb right-angled trapezoid core lamination and two edge limb isosceles trapezoid core laminations in all, wherein the whole iron yoke isosceles trapezoid core lamination has two shapes with different length A1 and A2 in all; the broken iron yoke isosceles trapezoid core lamination has two shapes with different length B1 and B2 in all; the broken iron yoke right-angled trapezoid core lamination has two shapes with different length C1 and C2 in all; and four seams are respectively formed at the four corners of the core as each layer of core lamination of each level of cores selects different shape combination. The transformer core laminated by the lamination mode not only saves the core materials but also reduces the no-load loss of the transformer and optimizes both the cost and the performance.

Description

technical field [0001] The invention relates to a power transformer iron core, especially a three-phase three-column power transformer iron core. Background technique [0002] The iron core of a power transformer is composed of very thin iron core laminations stacked one by one. The stacking method of the iron core laminations is an important factor affecting the consumption of transformer materials, no-load loss and no-load current. The traditional three-phase three-column power transformer core adopts a fully inclined three-joint stacking method. There are four types of core laminations for each level of core: such as image 3 , Figure 4-1 to Figure 4-4 As shown, the iron core laminations 21 constituting the upper and lower iron yokes of the iron core are a sheet type, and the side column iron core laminations 22 constituting the left and right columns of the iron core are a sheet type, and the iron core laminations constituting the core column There are two sheet types...

AI Technical Summary

Problems solved by technology

However, due to the small number of joints, the local magnetic density of the core laminations at the butt joint gap is too large, resulting in an increase in the no-load loss and no-load current of the transformer. Compared with the traditional fully inclined three-seam stacking method, it is also not Optimized for both cost and performance

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