Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of ground fault indication
Patent
1995-01-23
1996-11-26
Regan, Maura K.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of ground fault indication
324772, G01R 3114
Patent
active
055789285
ABSTRACT:
A method for detecting or sensing zero crossings in a rectified power signal comprising three separate signal constituents for energizing a three-phase circuit is provided. The method includes the steps of sampling at least two consecutive cycles of each signal constituent at a predetermined sampling rate; storing a predetermined number of samples for each signal constituent; computing a respective initial zero crossing estimate for each signal constituent; and checking the accuracy of the respective initial zero crossing estimate for each signal constituent of the power signal. If necessary, the method can further include the step of adjusting the initial estimate for the zero crossing of at least one of the three signal constituents of the power signal. In each case, the detected or sensed zero crossings, in turn, enable detection of a ground fault in the three phase circuit.
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General Electric Company
Regan Maura K.
Snyder Marvin
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