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Method and apparatus for arc quenching

  • US 3,947,649 A
  • Filed: 07/25/1974
  • Issued: 03/30/1976
  • Est. Priority Date: 03/30/1973
  • Status: Expired due to Term
First Claim
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1. Apparatus for quenching an arc in an electric AC circuit breaker having an arc chamber in which the arc rotates between two open electrodes in a quenching medium comprising:

  • a. first and second electrodes arranged coaxially and parallel to each other in the arc chamber;

    b. first and second leads coupled to the one respective end of each of said first and second electrodes;

    c. a nozzle formed at the other end of at least one of said electrodes, said nozzle projecting through a wall of the arc chamber;

    d. an equalization chamber on the other side of any wall containing a nozzle;

    e. means for selectively electrically coupling said first and second electrodes and for drawing an arc therebetween; and

    f. the discharge cross section of said nozzle in conjunction with a predetermined volume of the arc chamber being designed so that the overpressure produced by the heated quenching medium in said arc chamber is maintained beyond the zero crossing of the AC current.

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