Rms calculation circuit for digital circuit interrupters

Details Rms calculation circuit for digital circuit interrupters Rms calculation circuit for digital circuit interrupters

G - Physics

06

G

328/11, 348/31,

G06G 7/16 (2006.01) G01R 19/02 (2006.01) G01R 19/165 (2006.01) G06F 7/52 (2006.01) G06G 7/62 (2006.01) H02H 3/093 (2006.01)

Patent

CA 1245289

RMS CALCULATION CIRCUIT FOR DIGITAL CIRCUIT INTERRUPTERS ABSTRACT OF THE DISCLOSURE The root mean square value of sensed current within a protected circuit is used to determine the occurrence of an overcurrent condition. A frequency multiplying circuit produces a pulse stream having a frequency proportional to the square of the amplitude of an analog signal representation of the circuit current. A root mean square value over a prescribed interval is developed from the squared current value. The RMS value is processed within an integrated circuit trip unit to determine an overcurrent condition and to operate a pair of separable contacts to interrupt the circuit current.

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