Solid-state trip device comprising an instantaneous tripping...

Details Solid-state trip device comprising an instantaneous tripping... Solid-state trip device comprising an instantaneous tripping...

H - Electricity

02

H

348/26

H02H 3/04 (2006.01) H02H 1/06 (2006.01) H02H 3/08 (2006.01) H02H 3/093 (2006.01)

Patent

CA 1314321

ABSTRACT SOLID-STATE TRIP DEVICE COMPRISING AN INSTANTANEOUS TRIPPING CIRCUIT INDEPENDENT FROM THE SUPPLY VOLTAGE In a system-powered solid-state trip device, the measurement voltage Vm, representative of the current flowing in the conductor to be protected and applied to the input of an electronic processing unit, can also be applied to the cathode of a thyristor connected in series with the trip coil and receiving on its gate, the tripping orders from the processing unit. A Zener diode is connected between the thyristor gate and the ground so as to set an instantaneous tripping pick-up of the trip device. In this way, a short-circuit in the conductor causes instantaneous tripping of the circuit breaker independently from the value of the supply voltage.

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