Solid-state instantaneous trip device for a current limiting...

Details Solid-state instantaneous trip device for a current limiting... Solid-state instantaneous trip device for a current limiting...

H - Electricity

02

H

348/26

H02H 3/44 (2006.01) H02H 3/05 (2006.01)

Patent

CA 1281806

ABSTRACT SOLID-STATE INSTANTANEOUS TRIP DEVICE FOR A CURRENT LIMITING CIRCUIT BREAKER An instantaneous solid-state trip device has two threshold values providing an upper and a lower tripping threshold. A current increase rate detector determines, when a short-circuit occurs, the prospective peak current value and, if the peak value corresponding to the electrodynamic withstand of the circuit breaker is liable to be exceeded, causes a change of threshold to bring about tripping, as soon as the lower threshold is exceeded. This high-speed tripping favours short- circuit current limiting. When a short-circuit of a lesser importance occurs, the current variation is lower and the instantaneous trip release only trips when the upper threshold is exceeded. In most cases, this upper threshold is not reached and tripping selectivity can be easily achieved in the usual way. A break in the circuit connecting the sensor to the trip unit also causes the circuit breaker to trip. Refer to figure 1.

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