Three-phase oil-immersed power transformer

Abstract

The invention discloses a three-phase oil-immersed power transformer, which comprises an iron core, a low-voltage winding and a high-voltage winding, wherein the iron core comprises an upper iron yoke, an iron core column and a lower iron yoke; the iron core is laminated in a hybrid lamination mode; pieces are laminated on the central part which is 1 / 3 the total thickness of the iron core one by one, next, pieces are laminated on the next part which is 1 / 3 the total thickness of the iron core two by two, and pieces are laminated on the outermost part which is 1 / 3 the total thickness of the iron core three by three; the low-voltage winding is arranged on the inner side close to the iron core column; and the high-voltage winding is sleeved outside the low-voltage winding. Through the mode, distribution of magnetic flux density can be adjusted, so that the magnetic flux density distribution of each part of the iron core is uniform, no-load loss of the iron core can be reduced, and the labor hour is not increased.

Description

technical field [0001] The invention relates to a three-phase oil-immersed power transformer, in particular to a three-phase oil-immersed power transformer capable of reducing the no-load loss of an iron core. Background technique [0002] Since our country wants to create a conservation-oriented society, energy-saving and environment-friendly products will become a new direction for the development of the manufacturing industry in recent years. The three-phase oil-immersed power transformer is one of the important equipment in the power grid, and reducing the no-load loss of the three-phase oil-immersed power transformer is of great economic significance to the power grid. [0003] The no-load loss is an important parameter of the three-phase oil-immersed power transformer. As long as it is put into the power grid, no matter how much load it has, the no-load loss is the same. The no-load loss has nothing to do with the load of the transformer. The no-load loss of the trans...

AI Technical Summary

Problems solved by technology

[0004] Theoretically speaking, it is best to use a stack of one piece, but the corresponding man-hours of lamination and yoke insertion will increase, which is only suitable for small-capacity iron cores. In the actual production process, small and medium-sized transformer cores generally use two-piece stacks or The method of stacking three pieces, but it will cause the problem of uneven magnetic flux density in each part of the iron core, which will lead to the increase of transformer iron loss and no-load current, which will affect the reliable operation of the product.

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