Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Reexamination Certificate
2008-12-29
2011-11-08
Charioui, Mohamed (Department: 2857)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
C361S045000, C361S057000, C361S063000, C324S222000
Reexamination Certificate
active
08054593
ABSTRACT:
A circuit that includes a single grounded fault sensing transformer coupled to a resonant circuit that produces an output signal used by a microcontroller to determine a load current flowing through at least two conductors passing through the center of the sensing transformer. The microcontroller pings the resonant circuit, causing an impulse disturbance at the output signal, and the microcontroller calculates the inductance component of the resonant circuit based on the frequency of the decaying output signal. The microcontroller calculates the resistive core loss as a function of a known resistance of the resonant circuit, a known capacitance of the resonant circuit, the calculated inductance, and the determined rate of decay of the output signal. The calculated resistive core loss is compared to a table or to a polynomial function that characterizes known resistive core losses with known load currents to determine the load current corresponding to the calculated resistive core loss.
REFERENCES:
patent: 3614533 (1971-10-01), Douglas et al.
patent: 7079365 (2006-07-01), Brown et al.
patent: 7193827 (2007-03-01), Reid et al.
Erger Robert
Reid Paul A.
Charioui Mohamed
Rivera Vargas Manuel
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