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Commutation type DC breaker

  • US 5,452,170 A
  • Filed: 02/12/1993
  • Issued: 09/19/1995
  • Est. Priority Date: 02/21/1992
  • Status: Expired due to Fees
First Claim
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1. A commutation type DC breaker comprising:

  • a main contact adapted to be connected between a DC power supply and a load;

    a commutation circuit, including a series connection of a commutation capacitor, a reactor and a commutation switch, electrically connected in parallel to said main contact;

    a current detector for detecting a non-load current passing through the load;

    blocking means for blocking flow of a commutation current from said commutation circuit to the load;

    control means responsive to detection of the non-load current, for opening said main contact, to cause a commutation current to flow from said commutation circuit, and for actuating said blocking means, to block flow of the commutation current to the load.

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