Three-phase three-dimensional non-circular transformer body structure

Abstract

The invention discloses a three-phase three-dimensional non-circular transformer body structure which comprises an iron core and three coils. The iron core comprises three non-circular iron core columns with horizontal cross sections, the three coils surround the three iron core columns, the three coil structures are the same in size, the horizontal sections of the three coils are all non-circularshapes, each of the horizontal sections of the three coils has a curved side, a circumscribed circle is defined by the peripheries of the three coils, and the curved sides of the three coils are tangent to the circumscribed circle. The various performances of a transformer can be effectively improved by using the three-phase three-dimensional non-circular transformer body structure, and the manufacturing cost is reduced.

Description

technical field [0001] The invention relates to the technical field of transformers, and more precisely relates to a three-phase three-dimensional non-circular transformer body structure. Background technique [0002] With the continuous development of my country's economy, the emphasis on environmental protection is also increasing. In the field of transformers, with the gradual implementation of transformer energy efficiency standards and upgrading plans, the energy consumption and noise requirements of transformers have also been further improved. How to develop and manufacture high-efficiency and energy-saving transformers is the focus of the entire transformer industry. Traditional transformers are mostly stacked core structures, such as figure 1 As shown, the three-phase iron core and the coil are arranged in a straight line, the iron core and the coil are circular, and the punched sheet shape produces waste, and the material utilization rate is about 95%. Under the s...

AI Technical Summary

Problems solved by technology

Transformers with a planar circular stacked core structure can basically meet the energy efficiency requirements of S11 type. It is also the structure adopted by most transformer manufacturers at present. Due to its structural characteristics, it is difficult to make major breakthroughs in reducing losses and saving materials. , although it can also meet the energy efficiency requirements of S13 type, but the material cost is relatively high

At present, the mainstream structure of S13 products is a three-dimensional triangular transformer, and the structure of the three-dimensional triangular circular iron core is as follows figure 2 , A, B, C three-phase iron cores and coils are symmetrically arranged in a square shape, so that the three-phase magnetic circuits are completely symmetrical and balanced, and the harmonics have paths in their respective phases, which reduces the no-load current and the third harmonic. At the same time, the structure Compact, the cross-sectional area of ​​the iron yoke is half of the stacked iron core, the magnetic circuit L1=L2=L3, the weight of the iron core is lighter under the same cross-sectional area S, and the no-load loss is reduced, but because the coils are distributed in a circle, on the one hand, it limits The magnetic circuit between the two phases cannot be shortened, and more core materials are used to increase the no-load loss. On the other hand, the cross-sectional area of ​​the iron core in the circle is limited to a rectangle or double R shape, and the filling rate of the same cross-sectional area in the circle (S1 / S2 ) is lower, according to the design principle of the transformer, the smaller the cross-sectional area S1 of the iron core in the same circle, the higher the magnetic density of the iron core, the easier it is to saturate, resulting in the increase of the unit core loss and the increase of the no-load loss, and to reduce the unit area The internal magnetic flux density needs to be compensated by increasing the number of turns of the coil, which increases the weight of the coil wire material, the material consumption is higher, and the energy efficiency is lower; because the cross-sectional area of ​​the core is limited and the coil is still circular, although it is the same as the traditional stack Compared with the iron core, it has advantages, but it has not fully exerted its maximum advantages, and there is still room for improvement

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