Overcurrent protection apparatus

Details Overcurrent protection apparatus Overcurrent protection apparatus

1990-08-17

1992-06-23

Williams, Howard L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 42, 361 45, 361 94, H02H 326

Patent

active

051248751

ABSTRACT:
A current of an alternating current electric line is detected by a current transformer, the output of the current transformer is rectified by a rectifier, a series connection of a switching means and a resistor is coupled across the output terminals of the rectifier, a control circuit composed of a capacitor, a comparator and a reference voltage generator is coupled in parallel to the switching means through a diode, when the DC output voltage exceeds a predetermined voltage based on the reference voltage of the reference voltage generator, the comparator outputs a signal for closing the switching means, and the voltage which is applied to the control circuit is limited to a predetermined value.

REFERENCES:
patent: 3818275 (1974-06-01), Shimp
patent: 4331999 (1982-05-01), Engel et al.
patent: 4603336 (1986-07-01), Muller

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