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There are many transformers are the following: distribution transformers, power transformers, sealed transformers, modular transformers, dry type transformers, oil-immersed transformers, single-phase transformer, furnace transformer, rectifier transformers.

First,dry-type transformers

1. Epoxy resin insulation dry-type transformers

2. Gas insulated dry-type transformers

3, H-class insulation dry-type transformers

Second, the amorphous alloy core transformer

Transformer is a kind of power transmission and transformation equipment based on the electromagnetic principle and manufacturing, a guide magnetic circuit system is a main part of the transformer. The characteristics of direct magnetic material impact on the transformer technical and economic index. This article introduced is as a kind of distribution transformer manufacturing magnetic materials with amorphous alloy,the no-load loss value of new S9 type distribution transformer with same volume can be reduced by 75%,compared to the energy saving effect is obvious.

transformer losses of two parts. In addition to the entire line has a certain number of transmission transformers, there are operational in the power system at the end of the distribution transformers, the total number and a large percentage of the total capacity for the distribution network of major equipment indispensable distribution face very extensive. Currently the country is still ongoing power grid construction and transformation, if all distribution transformers using amorphous alloy core transformer can then either save a lot of energy for the country, will achieve significant environmental benefits.

Amorphous alloy transformer design ideas

The biggest advantage of the amorphous alloy core distribution transformers is that the value of extra-low load loss. Finally able to ensure no-load loss value is the core issue throughout the design process to be considered. When arranged in the product structure, in addition to considering amorphous alloy core itself from external forces, but at the same time in the calculation of selected parameters must reasonably accurate amorphous alloys. In addition design ideas, they also need to follow the following three requirements:

(1) Due to the low saturation flux density of the amorphous alloy material, product design, the rated flux density should not be selected too high, usually choose 1.3 ~ 1.35T magnetic flux density can get better value load loss.

(2)Monolithic thick amorphous alloy material is only 0.03mm, so the lamination factor can only reach 82% to 86%.

(3) In order to enable users to get the benefits of maintenance-free or less to maintain, are the amorphous distribution transformer products are designed, fully sealed structure.

Structural characteristics of amorphous alloy transformer.

The use of prominent magnetic properties of amorphous alloy core transformers to be used as material to eventually get a very low loss value. However, it has many features in the design and manufacture must be guaranteed and considerations. The main body reflect the following aspects:

(1) high hardness amorphous alloy sheet material is difficult to cut with conventional tools, so the design should consider reducing the amount of shear.

(2) amorphous alloy monolithic thin, the surface of the material is not very smooth, the core filling coefficient is low.

(3) amorphous alloy is very sensitive to mechanical stress.Structure design, must avoid using iron as the traditional design scheme of main bearing structure parts.

(4) In order to obtain an excellent low-loss characteristics of amorphous alloy laminations must be annealed.

(5) from the electrical performance. In order to reduce the amount of iron cut chips, the entire core product consists of four separate parallel composition of the core box, and each phase winding is set in the magnetic circuit of two separate boxes. In addition to the flux of each box fundamental wave magnetic flux, there exists the third harmonic flux, a winding two roll core box, its third harmonic flux opposite in phase, the value are equal, therefore, the third harmonic flux vector and zero within each set of windings. If one side is a D connection, there is the third harmonic current loop, when induced on the secondary side of the voltage waveform, there would be no third harmonic voltage components.

distribution transformers are: core, core box consisting of four separate three-phase five-column in the same plane, must be annealed, and with cross-yoke seams, cross-sectional shape is rectangular. Winding a rectangular cross section, may be formed around the separate-type, double-layered or multi-layered rectangular. Tank, sealed maintenance free for corrugated structure. 

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