Apparatus for monitoring an a-c variable

Details Apparatus for monitoring an a-c variable Apparatus for monitoring an a-c variable

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G01R 19/00 (2006.01) G01R 23/00 (2006.01) G01R 25/00 (2006.01) G01R 29/00 (2006.01) H02H 3/50 (2006.01) H02M 7/525 (2006.01)

Patent

CA 1082776

ABSTRACT OF THE DISCLOSURE Apparatus for the rapid monitoring of an alternating (a-c) variable with respect to amplitude, frequency and phase which includes a generator circuit for forming, from an actual a-c voltage imaging the monitored a-c variable, a reference a-c voltage of predetermined amplitude and frequency which is linked to the former in rigid phase relationship, and comparators for comparing individual signals of the generator circuit with the instantanious values of the actual value a-c voltage, permitting recognition of disturbances in a time which is substantially shorter than one period of the a-c variable monitored.

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