Method, memory media and apparatus for detection of grid...

Electrical transmission or interconnection systems – Switching systems – Condition responsive

Reexamination Certificate

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Reexamination Certificate

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07427815

ABSTRACT:
A phase shift procedure for detecting a disconnect of a power grid from a feeder that is connected to a load and a distributed generator. The phase shift procedure compares a current phase shift of the output voltage of the distributed generator with a predetermined threshold and if greater, a command is issued for a disconnect of the distributed generator from the feeder. To extend the range of detection, the phase shift procedure is used when a power mismatch between the distributed generator and the load exceeds a threshold and either or both of an under/over frequency procedure and an under/over voltage procedure is used when any power mismatch does not exceed the threshold.

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International Searching Authority Search Report and Written Opinion dated Sep. 29, 2006.

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