H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/26
H02H 3/44 (2006.01) H02H 3/08 (2006.01)
Patent
CA 1240025
IMPROVED CONTROL CIRCUIT FOR A CIRCUIT INTERRUPTER ABSTRACT OF THE DISCLOSURE A control circuit is provided for operating a circuit interrupter in response to overcurrent in an alternating-current line in which the circuit interrupter is located. The control circuit includes a transducer for producing output current proportional to the current in the line. A time-current trip signal generator circuit responds to output current representative of moderate overcurrent in the line byproducing a trip signal after the passage of a time period that is inversely related to the overcurrent. An instantaneous trip signal generator circuit produces a trip signal after a predetermined time interval in response to output current between a minimum and a maximum magnitude and increasing at a rate greater than a selectedrate, which conditions indicate the presence of high overcurrent in the line. In the preferred arrangement, the predetermined time interval is measured from the timethat the rate of change of the current exceeds a predetermined rate. Accordingly, when the onset of high overcurrent is detected, the current is interrupted with a minimum possible delay while substantially reducing undesired response to noise and false signals.
485640
Harner Robert H.
Ruta Joseph W.
Osler Hoskin & Harcourt Llp
S&c Electric Company
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