H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/26
H02H 3/093 (2006.01) H02H 3/44 (2006.01)
Patent
CA 1277410
ABSTRACT A control circuit is provided for a circuit interrupter that achieves an inverse-time characteristic for overcurrents that include instantaneous current levels higher than the interrupting capability of the circuit interrupter by synchro- nizing the operation of the circuit interrupter to ensure that circuit interrupter takes place when the instantaneous current is within the interrupting capability of the circuit interrupter. This interrupting capability is similar to let-through current and is defined by the instantaneous magnitude of the current at the time of inter- ruption or at a particular stage thereof. The control circuit is responsive to a time- current characteristic signal generator that provides a time-current signal in response to overcurrent after the passage of a time delay that is inversely related to the overcurrent. The control circuit utilizes the time-current signal to permit asynchronous operation of the circuit interrupter when the peak of the overcurrent is expected to be within the interrupting capabilities of the circuit interrupter and to control operation of the circuit interrupter in a manner synchronized with the over- current when the peak of the overcurrent is expected to exceed the interrupting capabilities of the circuit interrupter; the interruption in the synchronized manner being arranged to occur when the instantaneous current is within the interrupting capabilities of the circuit interrupter. In a preferred arrangement, the rate ofchange of the current and the instantaneous current level are utilized to decide if the overcurrent will exceed the interrupting capabilities of the circuit interrupter. If such overcurrents are predicted, the rate of change of the current and the instan- taneous current being within a predetermined current range are utilized to synch- ronize operation of the circuit interrupter.
513008
Osler Hoskin & Harcourt Llp
S&c Electric Company
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