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Service Line Safety Monitor

  • US 20120287542A1
  • Filed: 05/14/2012
  • Published: 11/15/2012
  • Est. Priority Date: 05/12/2011
  • Status: Active Grant
First Claim
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1. A method for detecting a defective connection to an EVSE comprising:

  • applying line power to the EVSE;

    determining whether the EVSE is drawing a load current;

    measuring the line voltage when there is no-load current;

    storing the measured no-load line voltage in a memory;

    applying a current load to the EVSE;

    measuring the EVSE load voltage under a load;

    determining a voltage loss differential from the load voltage and the no-load voltage;

    deriving a power loss from the voltage loss differential;

    determining whether the power loss exceeds a safe limit; and

    disconnecting the EVSE load from line voltage if the safe limit is exceeded.

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