Electronic trip device comprising a correcting device

Details Electronic trip device comprising a correcting device Electronic trip device comprising a correcting device

H - Electricity

02

H

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

Patent

CA 2095994

13 ABSTRACT ELECTRONIC TRIP DEVICE COMPRISING A CORRECTING DEVICE The trip device comprises an elactronic processing unit (7) which gives a tripping order (D) in terms of the rms value of the current measured (Im) by current transformers and of the threshold (S) and time delay (T) setpoints. The non linearity of response of the transformers is corrected by a device (9) which modifies the current, threshold, or time delay values. These corrected values (Ic, Tc and Sc) enable precise trippings to be achieved in compliance with the valuesof the current flowing in the circuit breaker. The type of correction is adapted to the circuit breaker rating by parameters (11), obtained by means of tests and previously stored in a device (10). (Figure 3).

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