H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/28
H02H 3/00 (2006.01) H02H 7/12 (2006.01)
Patent
CA 1115823
ABSTRACT OF THE DISCLOSURE A direct current, high-speed circuit breaker which is connected in series at the direct current side of one of a plurality of inverters connected in parallel in a high voltage transmission system, and which is caused to open when the magnitude of the direct current to the one inverter exceeds a threshold value, is further controlled to open in response to the occurrence of a commutation failure only when such failure occurs simultaneously with reduction of the commutation voltage of the one inverter below a rated value by more than a first predetermined magnitude such that proper operation of the one inverter is no longer assured, and the threshold value of the direct current is increased from a normal value to a selected higher value in response to a reduction of the commutation voltage below the rated value by more than a second predetermined magnitude which is less than the first predetermined magnitude.
311779
Fetherstonhaugh & Co.
Licentia Patent-Verwaltungs-Gmbh
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