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Transformer with parallel magnetic circuits of unequal mean lengths and loss characteristics

  • US 4,205,288 A
  • Filed: 10/27/1978
  • Issued: 05/27/1980
  • Est. Priority Date: 10/27/1978
  • Status: Expired due to Term
First Claim
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1. An electrical power transformer for transmitting and distributing electrical power in an electrical power system, comprising:

  • a magnetic core devoid of non-magnetic gaps,said magnetic core being constructed to provide inner and outer parallel, concentrically adjacent, magnetic circuits,said inner and outer magnetic circuits being constructed of magnetic materials having different loss characteristics at like inductions, with the inner magnetic circuit being constructed of the material having the lower loss characteristic,said outer magnetic circuit being constructed of a first grain oriented, regular B, electrical steel,said inner magnetic circuit being constructed of a second grain oriented, high B, electrical steel having a higher permeability at like levels of induction, and a higher B10 value, than said first grain oriented electrical steel, with said second grain oriented electrical steel having a B10 value of at least 18.5 KG,and first and second electrical windings each disposed to link both said inner and outer magnetic circuits, said first and second electrical windings being adapted for connection to a source of electrical potential and to a load circuit, respectively,said inner magnetic circuit being constructed to provide 30 to 60% of the weight of said magnetic core to provide a lower overall core loss in watts per pound than the selected weight ratio would indicate, based upon the core losses of each of the first and second grain oriented electrical steels when used alone.

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