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Current switch with automatic calibration

  • US 7,855,655 B2
  • Filed: 08/13/2008
  • Issued: 12/21/2010
  • Est. Priority Date: 09/10/2007
  • Status: Active Grant
First Claim
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1. A method of monitoring a current in a power cable, said method comprising the steps of:

  • (a) storing a default activation current in a memory before measuring a current in said power cable;

    (b) measuring a current in said power cable;

    (c) if an activation current stored in said memory is said default activation current, replacing said default activation current with a stored activation current determined from a measured current in said power cable; and

    (d) initiating and, alternatively, disabling an alarm if a magnitude of said power cable current varies in a predetermined manner from said stored activation current.

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