Amorphous Metal Transformer

An amorphous metal transformer (AMT) is a type of energy efficient transformer found on electric grids. The magnetic core of this transformer is made with a ferromagnetic amorphous metal. The typical material (Metglas) is an alloy of iron with boron, silicon, and phosphorus in the form of thin (e.g. 25µm) foils rapidly cooled from melt. These materials have high magnetic susceptibility, very low coercivity and high electrical resistance. The high resistance and thin foils lead to low losses by eddy currents when subjected to alternating magnetic fields. On the downside amorphous alloys have a lower saturation induction and often a higher magnetostriction compared to conventional crystalline iron-silicon electrical steel.

Amorphous metals are made of alloys that have no atomic order. They are made by rapid cooling of molten metals that prevents crystallisation and leaves a vitrified structure in the form of thin strips. Due to the lack of systematic structure, this type of metal has also been given the name "The Metallic Glasses".

Amorphous Metal Core Transformer

An amorphous metal core transformer's great benefit is that the amorphous steel core has a lower hysteresis loss. Since there is no atomic arrangement law, the small energy loss (delay) when the induced current flows through the iron core.

Non-crystalline structure and random arrangement of atoms give low magnetic fields and high resistivity. Due to the magnetic field, low delay, and eddy currents with high resistivity, losses are minimal. As the core loss of metal alloy amorphous reduced by 42% and the magnetization current is 53%.

Besides, eddy current losses are reduced because of a thickness of approximately 0.03 mm, about 1/10 of silicon steel. The no-load loss rating is 1/4 to 1/3 of transformers that use traditional silicon steel for the core. By the way, the temperature in this amorphous steel core is low, which will significantly reduce the amount of air CO2 released into the environment.

Two types of energy losses are inherent in a distribution transformer's operation: Load losses (copper losses) vary depending on the transformer load, and no-load losses (iron losses) occur out in a magnetic field. When this is replaced with amorphous metal, the transformer's core is reduced by up to 75%.

Compared with CRGO (Cold Roll Grain Oriented) transformer, AMT has the following main advantages:

● Lower no-load loss.

● As the no-load loss is lower, the temperature rise of transformer is lower.

● Better harmonic wave tolerances.

● Potential for lower total cost of ownership.

GNEE Electrical Group Co., Ltd. is founded in 2008. It is a manufacturer which mainly produce 10 kv to 35 kv oil immersed power distribution transformer, cast resin power distribution transformer, pad mounted transformer, compact substation, amorphous alloy transformer and substation transformer.

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