High-efficiency low-energy-consumption transformer

Abstract

A high-efficiency low-energy-consumption transformer comprises silicon steel sheets, an upper iron yoke, a lower iron yoke, an iron core column and a coil, and the iron core column is formed by stacking a plurality of silicon steel sheets in sequence; a plurality of silicon steel sheets forming the iron core column are divided into a plurality of units, and each unit is composed of a plurality of groups of silicon steel sheets with different widths; all the silicon steel sheets are radially and centripetally arranged, each group of the plurality of groups of silicon steel sheets is formed by stacking a plurality of silicon steel sheets with the same width, and all the silicon steel sheets are consistent in length; the silicon steel sheets of the upper iron yoke and the lower iron yoke are consistent in length and width. The transformer has the advantages that the iron core eddy current loss is small, the phenomenon that the local temperature of the coil is too high is eliminated, the aging speed of a coil insulator is slowed down, the material utilization rate is high, the production cost is low, the iron core column does not deform, the mechanical rigidity is high, the designed insulation distance can be reliably guaranteed, and the operation reliability and timeliness of the transformer are greatly improved.

Description

technical field [0001] The invention relates to a transformer, in particular to a transformer with a novel iron core column structure. Background technique [0002] In traditional power equipment such as transformers with excitation cores, the conductive core columns are all stacked with multiple silicon steel sheets. The specific cross-sectional shape is as follows: figure 1 , figure 2 , image 3 , Figure 4 with Figure 5 As shown in the figure, the lamination direction of the silicon steel sheet 1 can be divided into flat stacking type, three-dimensional type and gradual opening type. There are following problems in power equipment such as excitation core transformers of the prior art: [0003] First, the core eddy current loss (load loss) is large [0004] Due to the existence of the skin effect of the conductor and the edge derivation effect of the magnetizer, the excitation characteristics of the magnetic excitation core cannot be fully reflected when the rated ...

AI Technical Summary

Problems solved by technology

It can be seen that when a large number of magnetic excitation lines pass through the plane of the silicon steel sheet, the silicon steel sheet in the high verticality area will generate a very large eddy current loss, which will cause the silicon steel sheet to heat up, or even turn red and burn the transformer

[0005] Second, the local temperature of the coil is too high to accelerate the aging of the coil insulator

[0006] During the magnetic derivation process of the iron core column under the rated load, under the action of edge derivation, the strength of the magnetic excitation line of the entire magnetic core column is inconsistent, resulting in inconsistent induced potential received by the coil, resulting in local overheating of the coil (such as Figure 11 , Figure 12 Shown): the heating point forms a strip-shaped insulating carbonization phenomenon from top to bottom in the coil 10 (coil heating and carbonization place 42), at this time, a large amount of magnetic flux leakage derivates to nearby metal bodies, such as the tank wall of the fuel tank, causing nearby Metal body heating increases additional loss until the transformer coil is burned

[0007] 3. High production cost and low utilization rate of materials

What is the result? Under the excitation characteristics of the rated load, the small amount of change brought about by this is not cost-effective compared with the production cost of the material. Instead, the electromagnetic noise of the transformer increases and the mechanical force of the iron core is serious due to the thin raw material. The negative consequences such as the decline and the increase of the difficulty factor of iron core production by 2-3 times have also brought stringent precision requirements to special equipment manufacturers, which has increased the manufacturing cost of professional equipment by more than 300%, which has brought great harm to global transformers and power equipment with excitation cores. Production enterprises increase the loss of incalculable economic resources

[0008] In addition, in order to reduce the so-called no-load loss of the traditional transformer core, the existing manufacturers try to achieve the goal by continuously improving the shape of the iron core, or change the original stack of several silicon steel sheets into a single interleaved stack, or change from the original The direct seams are changed to oblique seams, the more the sheet type is changed, the lower the utilization rate of raw materials is.

For example, the current popular amorphous alloy transformer in the market, its iron core can only be hung on the coil, resulting in a sharp drop in its stability; when running at full load, the electromagnetic noise is over 90 decibels and uncontrollable, the resulting electromagnetic vibration More than 200-300um

Therefore, the improved product is basically a directional error. The more sheet types will inevitably lead to low material utilization, complex structure, difficult assembly, and high production costs, which will lead to decreased reliability, decreased economic indicators, and poor advancement (such as Figure 7 Shown: the upper and lower iron yoke sheets 6, 9, and iron core columns 7, 71, 72 are composed of different silicon steel sheet shapes 8 respectively)

[0009] 4. The mechanical force of the iron core column is poor and easy to deform, and the design insulation distance is difficult to guarantee

Then the coil 10 is installed. After the coil is assembled, the upper iron yoke pieces must be inserted one by one, and each piece must be carefully aligned so that the silicon steel sheet of the upper iron yoke 6 can be completely inserted. The difficulty can be imagined, which limits the capacity. Improvement, low labor efficiency, seriously restricting industrial development

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