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Method of detecting faults using graduated fault detection levels

  • US 20070086135A1
  • Filed: 09/08/2006
  • Published: 04/19/2007
  • Est. Priority Date: 10/18/2005
  • Status: Active Grant
First Claim
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1. A faulted circuit indicator comprising:

  • i) a housing;

    ii) a current acquisition circuit disposed within the housing, the current acquisition circuit adapted to monitor current within a conductor;

    iii) an adjustable trip circuit coupled to the current acquisition circuit and producing a trip output;

    iv) a persistent memory component disposed within the housing, the persistent memory component storing at least one fault indication curve, where the at least one fault indication curve comprises a plurality of associated fault current levels and fault times; and

    v) a processor, the processor disposed within the housing and coupled to the adjustable trip circuit and the persistent memory component, the processor adjusting the trip level of the adjustable trip circuit based on the passage of time and the at least one fault indication curve and producing a fault signal based on the trip output and the at least one fault indication curve.

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