A DEVICE FOR PROTECTION AGAINST SHORT CIRCUITS FOR AC NETWORKS AND CURRENT LIMITING CIRCUIT BREAKER APPRO- PRIATE FOR SUCH A DEVICE.

摘要

THE INVENTION PROVIDES A DEVICE FOR PROTECTING AN AC DISTRIBUTION NETWORK AGAINST SHORT CIRCUIT CURRENTS AND AN APPROPRIATE CURRENT LIMITING CIRCUIT BREAKER. A DOWNSTREAM CIRCUIT BREAKER (D1) GENERATES A SIGNAL (S) FOR NEUTRALIZING THE OPENING OF THE CONTACTS OF AN UPSTREAM CURRENT LIMITING CIRCUIT BREAKER (D2) WHEN THE DOWNSTREAM CURRENT EXCEEDS A NEUTRALIZTION THRESHOLD LESS THAN THE TRIPPLING THRESHOLD AND/OR THAN THE LIMITATION THRESHOLD OF (D2). THE UPSTREAM CURRENT LIMITING CIRCUIT BREAKER (D2) HAS IN PARALLEL A PAIR OF HEAD TO TAIL THYRISTORS (TH1, TH2) AND A CIRCUIT (16) FOR CONTROLLING THE GATES OF THE THYRISTORS IN RESPONSE TO THE SIGNAL (S) FOR INHIBITING (D2) FOR AT MOST ONE HALF WAVE.(FIG. 1)