Electronic overload detecting device

Details Electronic overload detecting device Electronic overload detecting device

G - Physics

01

R

324/58

G01R 31/02 (2006.01) H02H 3/093 (2006.01)

Patent

CA 1041606

ABSTRACT OF THE DISCLOSURE A device for detecting a persisting electrical overload in an electrical system includes a sensor for monitoring the current in the electrical system and for generating an electrical signal whose magnitude represents the instantaneous absolute value of the current. A thres- hold control generates an output signal of predetermined value and develops, in cooperation with the sensor, an electrical signal whose magnitude represents the amount by which the magnitude of the absolute value signal exceeds the predetermined value. An integrator integrates the aforementioned electrical signal to generate an output whose magnitude includes a component representative of the product of the electrical signal and a time-increasing value that represents the duration that an overload has persisted. A comparator continuously compares the magnitude of the integrater output signal with a second preselected value and generates an indicative output whenever the inte- grator output signal exceeds the second preselected value.

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