Electrical transmission or interconnection systems – Switching systems – Condition responsive
Reexamination Certificate
2003-11-14
2008-09-23
Sherry, Michael J (Department: 2836)
Electrical transmission or interconnection systems
Switching systems
Condition responsive
Reexamination Certificate
active
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.
Du Pengwei
Ye Zhihong
Agosti Ann M.
General Electric Company
Parries Dru M
Sherry Michael J
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