Advantages and disadvantages of amorphous alloy and silicon steel sheet for transformer
In terms of electrical performance. In order to reduce the shear of the iron core, the core of the product consists of four individual core frames, and each phase winding is sheathed on a two frame independent of the magnetic circuit. The flux within each frame in addition to the three fundamental magnetic flux, and the harmonic magnetic flux exists, a winding of the two volume of core box, third harmonic flux is opposite in phase, value equal, therefore, each set of windings in the three harmonic flux vector and zero. If the primary side is the D connection, there are three harmonic current loop, when the voltage waveform on the two side of the induction, there will be no three harmonic voltage components
An amorphous alloy with outstanding magnetic conductivity is used as the core material for the manufacture of transformers, and a very low loss is achieved at last. But it has many characteristics, and must be guaranteed and considered in the design and manufacture. The main body embodies the following aspects:(1) the hardness of the amorphous alloy sheet is very high, so it is difficult to cut with conventional tools. Therefore, the amount of shearing should be considered when designing.(2) the thickness of the amorphous alloy is very thin, and the surface of the amorphous alloy is not very flat, but the filling coefficient of the core is low.(3) amorphous alloy is very sensitive to mechanical stress. Structural design, we must avoid using the core as the main load-bearing structure of the traditional design.(4) in order to obtain good low loss characteristics, the amorphous alloy core must be annealed.
The amorphous alloy iron core transformer production and the no-load loss of the iron core transformer ratio of silicon steel sheet (refers to the transformer secondary open circuit, measured in the primary power loss) decreased by about 80%, the no-load current (transformer secondary open circuit, the primary is still a certain degree of current, this part of the current known as the no-load current) decreased about 85%, is the distribution transformer is the ideal energy saving effect, especially suitable for rural and developing areas such as grid where the load was low.
