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     amorphous transformer_amorphous alloy transformer introduction-amorphous alloy power transformer technology introduction

 
    Transformer is a type of power transmission equipment developed on the basis of electromagnetic theory. Permeability magnetic circuit is a major part of the transformer. The performance of the magnetic material directly affects the technical and economical parameter of the transformer. The article mainly introduced a kind of distribution transformer whose amorphous alloy is used as the magnetic material. The no-load loss is 75% lower than the same capacity of S9 type distribution transformer, and the energy-saving is significant.
The power loss mainly includes line loss and transformer loss in the power system. There is distribution transformer working on the end of the power system except for the a certain number of distribution transformers. The total number and total capacity take a large proportion, it is the indispensable equipment for the distribution grid, and it is widely distributed. And at present, the nation are continuously do the grid construction and reform. If all distribution transformer can apply the amorphous alloy core transformer then it can save a lot of energy and can achieve the significant environment benefits.
amorphous alloy transformer design
    The greatest advantage of the amorphous alloy transformer is the ultra-low no-load loss. The maintenance of the no-load value is the core problem of the process of design. Despite the consideration of the feature of unaffected by the external force, it should also choose the reasonable accuracy parameter of the amorphous alloy. It also should adhere to the following three requirements besides the design ideas.
(1)For the low saturation flux density of amorphous alloy material, so it should not choose the too high rated flux magnetic flux density, usually 1.3～13.5 T magnetic flux intensity can achieve a good no-load loss value.
(2)the thickness of the single chip of the amorhous alloy material is ony 0.03mm, and so its laminated factor can only reach 82%～86%.
(3)the amorphous alloy distribution transformers all apply the whole sealed structure for the effect of maintenance-free or less maintenance.
features of amorphous alloy
    The amorphous alloy is used as the material of transformer core and can gain a ultra-low loss value. Yet it has many features which should be considerate during the process of design and produce. There are:
(1)The high hardness: it is impossible to cut by the conventional instrument, so it should consider reducing the shear volume.
(2)The thickness of single chip, and the material surface is not so flat, and so the core block coefficient is rather low.
(3)The amorphous alloy is sensitive to the mechanical. And therefore during the process of design structure, it should avoid to use the iron as the main load-bearing.
(4)In order to get the good low-loss characteristics, the amorphous alloy core chip must experience the annealing treatment
(5)On the base of electrical performance, in order to reduce the shear volume, the iron of the whole product is composed by four shunt independent core boxes, and each phase winding is cased on the two box of independent magnetic circuit. Despite the fundamental flux, there is also triple harmonic flux. The triple harmonic flux is contrary in the phase, and equal in the value of wound core box of each winding, and therefore, the triple harmonic flux vector is zero in each winding. If the first side is the D-connecting way, and there are triple harmonic current circuit, and then there is no triple harmonic voltage in the induced second side voltage.
Based on the above analysis, the most reasonable structure of the three-phase amorphous alloy distribution transformer is: core: four separate core boxes on the same plane to form the three-phase five-pillar, and it must through the annealing treatment and with cross-section conjugate joint, the cross-section shape is rectangular and the wing cross-section should also be the rectangular shape, and the can be formed by single winding, the winding is double-layer or multi-layer forms. And the tank should be the corrugated structure of the whole sealed maintenance-free.
performance standard of the amorphous alloy transformer
    S9 type distribution transformer is widely used at present, its core adopts the high permeability cold-rolled silicon steel sheet of 30Z140, the saturation flux density is higher than that of amorphous alloy which usually adopts the material-flux density is about 1.65～1.75. that’s why the no-load loss of amorphous alloy core distribution transformer is lower than that of S9 type distribution transformer. Table 1 is the comparison of no-load loss value between three-phase amorphous alloy core distribution transformer and S9 type distribution transformer.
table 1 comparison of no-load loss value between three-phase amorphous alloy core distribution transformer and S9 type distribution transformer

foil winder
from the data of stable 1, to adopt the new material to reduce the no-load loss of the distribution transformer and get the effect of energy-saving is an possible way.
service effect of amorphous alloy transformer
    it can save more power than the S9 distribution transformer
take the 800kVA for example，△P0 is 1.05kW；the load loss value of the two type of transformer is equal, and then according to the formula △Pk=0，it can calculate the reduced power loss of one product：
△Ws=8760(1.05+0.62×0)=9198kW•h
Through the calculation of such specification product, we can know that the energy-saving effect of the three-phase alloy core distribution transformer series product is very good. And for that the tank apply the whole-sealed structure, the oil is separated from the air and thus protect the oil oxidation, and extend the service life of the product and it also save the maintenance fees for the users.
the development prospect of amorphous alloy transformer
    If the amorphous alloy transformer can completely replace the S9 series distribution transformer, if the annual need of 10KV distribution transformer is 50 million KVA, then it can save power over 10 billion KW•H, and it also environment-protection for less power plant built: less greenhouse gas emission to the atmosphere will greatly reduce the direct pollution to the environment and make the product a true green product. In short, if the three-phase amorphous core distribution transformer is widely used during the process of urban and rural grid system development and transformation, it can achieve the effect of energy-saving and environment-protection.