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Power supply circuit for a direct current arc furnace

  • US 4,461,010 A
  • Filed: 07/29/1982
  • Issued: 07/17/1984
  • Est. Priority Date: 07/29/1982
  • Status: Expired due to Term
First Claim
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1. A power supply circuit for providing a continuous DC arc between two electrodes of an electric arc furnace, comprising:

  • a three-phase AC power source for providing an AC current and an AC voltage;

    rectifier means having three input terminals and first and second output terminals, one of said electrodes being connected to the first output terminal of said rectifier means;

    a DC inductance having a first terminal connected to the second output terminal of said rectifier means and a second terminal connected to the second of said electrodes;

    transformer means having primary windings and secondary windings;

    first, second and third linear reactors for producing a change in phase angle between the AC current and AC voltage in response to a change in DC arc length to control the DC arc current and power input to the furnace; and

    circuit means connecting the linear reactors and the transformer means in series between the AC power source and the rectifier means.

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