Amorphous Alloy Dry Type Distribution Transformer

SYHF high quality Amorphous Alloy dry type distribution transformer The thickness of amorphous alloy strip used is small, and the resistivity is about three times that of cold rolled silicon steel sheet. Therefore, the iron core made of amorphous alloy has much smaller eddy current loss than that made of cold-rolled silicon steel sheet. The hysteresis loss of the alloy is much less than that of the cold rolled silicon steel sheet. The core loss is very low, about 75% lower than the no-load loss of the traditional silicon steel core transformer. It is a reasonable low loss energy-saving transformer. In addition, the coercivity of amorphous alloy is far less than 4A/m, which is about 1/7 of that of cold rolled silicon steel sheet. The hysteresis loop area of amorphous alloy is much smaller than that of cold rolled steel plate, which belongs to amorphous state. Due to low loss, amorphous alloy transformer has less heating, low temperature rise and stable operation performance.

Amorphous alloy dry type distribution transformer uses amorphous alloy with outstanding magnetic conductivity as the core material of transformer, and can finally obtain very low loss value. But it has many characteristics, which must be guaranteed and considered in the design and manufacture. The main body reflects the following aspects:

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

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

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

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

(5) In terms of electrical performance. In order to reduce the shearing amount of iron chip, the iron core of the whole product is composed of four separate iron core frames in parallel, and each phase winding is set on two frames with independent magnetic circuit. In addition to the fundamental magnetic flux, there is also a third harmonic magnetic flux in each frame. The third harmonic magnetic flux in two wound iron core frames in a winding is exactly opposite in phase and equal in value. Therefore, the sum of the third harmonic magnetic flux vectors in each group of windings is zero. If the primary side is d-connected, the circuit with third harmonic current will not have the third harmonic voltage component on the induced voltage waveform at the secondary side.