Electronic circuit breaker with correcting device.

摘要

The trip mechanism includes an electronic processing unit (7) which issues a tripping command (D) depending on the root-mean-square value of the measured current (Im) via current transformers and threshold (S) and timing (T) instructions. The non-linearity of the response of the transformers is corrected by a device (9) which modifies the values of the current, of the threshold or of the timing. These corrected values (Ic, Tc and Sc) allow accurate tripping in accord with the values of the current crossing the circuit breaker. The type of correction is matched to the rating of the circuit breaker through parameters (11) obtained by means of trials and stored beforehand in a device (10). <IMAGE>