BRG

Distribution Transformers

Amorphous Core Alloy Distribution Transformers (AMDT)

The manufacturing of Amorphous Core Distribution Transformers is similar to the conventional ones except for the core manufacturing. The AMDT uses a rectangular winding instead of a round one since the core is progressively wound in a rectangular shape from several ply of amorphous ribbons over a specially built mandrel

About Amorphous Metal

Amorphous Metal is an Alloy of Ferrous - 78 Boron - 13 and Silicon - 9 and rest of the composition constitutes of other compounds. Amorphous has a highly non crystalline structure at the granular level and they do not have any fixed magnetic domains.

Thus, every domain is nothing but a closed magnetic circuit as shown in the figure above. Now consider what happens when an alternating current of 50 cycles is applied. The domains "switch" to and fro 50 times in a second. Therefore the domain looks like this as the current alternates 50 times and the diagrams below represent the direction of the domain as the current alternates.

And so on ... ..50 times every second

The horizontal switches require more energy to be completed and also "lag" behind the vertical switches, and this result in heat, which results in the hysterisis loss within the steel. The sum total of the energy required for the horizontal switches to occur is the total hysterisis losses of the steel. Thus the larger the grains, the lower the losses as there are less total number of grains in the steel and therefore less number of "switches" and low hysterisis losses.

But there are no fixed magnetic domains in Amorphous and since a random arrangement is predominant at the granular level, the magnetization current required to excite the core at the initial level is very less.


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