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

(2) The thickness of the single piece of amorphous alloy is extremely thin, and the surface of the material is not very flat, so the core filling factor is low.

(3) Amorphous alloys are very sensitive to mechanical stress. In structural design, the traditional design scheme with iron core as the main load-bearing structural component must be avoided.

(4) In order to obtain excellent low loss characteristics, the amorphous alloy iron chip must be annealed.

(5) From the electrical performance. In order to reduce the amount of shearing of the iron chip, the core of the entire product is composed of four separate core frames side by side, and each phase winding is sleeved on two independent magnetic frames. In addition to the fundamental magnetic flux, the magnetic flux in each frame also has the third harmonic magnetic flux. In the two coil core frames of one winding, the third harmonic magnetic flux is exactly opposite in phase, numerically. Equal, therefore, the third harmonic flux vector sum in each set of windings is zero. If the primary side is the D connection method, there is a loop of the third harmonic current. When the secondary voltage waveform is induced, there will be no third harmonic voltage component.

According to the analysis above, the most reasonable structure of a three-phase amorphous alloy distribution transformer is: an iron core, which consists of four separate iron core frames in the same plane to form a three-phase five-column type, which must be annealed and has a crossed iron yoke Seams with rectangular cross-section. The winding has a rectangular cross-section and can be individually wound and formed into a double-layer or multi-layer rectangular layer. The fuel tank is a fully sealed and maintenance-free corrugated structure.

The currently widely used new S9-type distribution transformers are usually made of 30Z140 high-permeability cold-rolled silicon steel sheets. The saturation magnetic density is higher than that of amorphous alloys. The magnetic flux density used in product design is usually It is between 1.65 and 1.75T. This is one of the main reasons why the amorphous alloy core distribution transformer has lower no-load loss than the new S9 type distribution transformer.

If it can completely replace the new S9 series distribution transformers, such as when the annual demand for 10kV-class distribution transformers is calculated at 50 million kVA, then it can save more than 10 billion kW · h in a year. At the same time, it can also bring good environmental protection benefits of fewer power plants and less greenhouse gas emissions to the atmosphere, which will greatly reduce direct environmental pollution and make it a new generation of truly green environmental protection products.

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