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Post by techwriter on Nov 5, 2013 2:16:58 GMT -5
What is the core of a transformer made of ?
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Post by Chang on Nov 6, 2013 5:18:03 GMT -5
A transfomer is made of a special steel called the Electrical Steel which is also known as the silica steel. This is steel which contains silica (upto 15%).
The silica in the steel increases the resistivity of the core there by reducing the copper losses. Electrical steel also has excellent magnetic properties which causes reduced hysteresis losses.
The Electrical steel used for transformer core is called grain oriented electrical steel. This means that the magnetic flux is oriented towards a specific direction minimizing losses due to leakage.
The Electrical steel is designed in the form of thin sheets which are laminated on either side to prevent losses due to eddy current.
In recent times, another material known as Metglass is increasingy used in Distribution transformers. Metglas is a suspension of Iron or cobalt in a former of phosphorous, silicon or boron. MetGlas has excellent magnetic properties which reduce the hysteresis losses and high resistivity which minimize copper losses. Transformer which use this material are known as Amorphous Metal Transformers.
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