Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1978-09-21
1980-06-17
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
363 50, 363 56, H02H 7122
Patent
active
042086914
ABSTRACT:
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.
REFERENCES:
patent: 3683264 (1972-08-01), Schieman et al.
patent: 3851322 (1974-11-01), Compoly et al.
patent: 3992659 (1976-11-01), Ekstrom
patent: 4016468 (1977-04-01), Graf
Licentia Patent-Verwaltung-G.m.b.H.
Salce Patrick R.
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