Circuit breaker with solid-state trip unit with a digital...

Details Circuit breaker with solid-state trip unit with a digital... Circuit breaker with solid-state trip unit with a digital...

H - Electricity

02

H

348/26, 348/36

H02H 3/093 (2006.01)

Patent

CA 1236909

Abstract CIRCUIT BREAKER WITH SOLID-STATE TRIP UNIT WITH A DIGITAL PROCESSING SYSTEM SHUNTED BY AN ANALOG PROCESSING SYSTEM Solid-state trip unit having a unit (29, 50, 48) for digital processing of signals emitted by current sensors (16). The digital processing system provides the long delay, short delay and instantaneous tripping functions and delivers a tripping order to the relay (14). An analog processing unit (70) is con- nected parallel with the digital processing unit to transmit an instantaneous tripping order to the relay (14). When the digital processing unit operates, the analog unit pick-up level is higher than the digital instantaneous tripping pick-up and this pick-up is reduced to a lower or equal value, if the digital unit is inactive. Refer to figure 1.

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