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Write about choice of flux density for designing of transformer
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written 2.5 years ago by |
Choice of Flux Density
The output equation and the emf equation indicate that the choice of flux density Bm affects the core area Ai.
Higher flux density reduces the core area.
This will reduce the diameter of the circumscribing circle, thereby reducing the length of mean turn of winding.
Thus, there will be a huge saving in the cost of copper and iron.
But, a higher flux density, while saving copper and iron, will also result in increased magnetizing current leading to saturation, increased iron losses requiring elaborate cooling arrangements.
The choice of Bm also depends on the type and service conditions of the transformer.
Type of transformers | Value of flux density |
---|---|
Distribution transformer-hot rolled silicon steel |
1.1 to 1.4 Wb/m² |
Power transformer-hot rolled silicon steel | 1.2 to 1.5 Wb/m² |
Transformers using cold rolled grain oriented steel Up to 132 kV For 275 kV For 400 kV |
1.55 Wb/m2 1.6 Wb/m² 1.7 Wb/m² |