Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1977-12-08
1979-11-06
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 69, 361 91, H02H 328
Patent
active
041737741
ABSTRACT:
In systems, such as aircraft electric power generation systems, three phase AC generators are often operated in parallel when supplying power to load busses and differential protection networks are utilized in each phase of each generator for detecting current imbalance between the phase conductor at the load and the neutral conductor of each phase. In this invention there is provided voltage limiter means such as back-to-back Zener diodes across each of the current transformers related to the phase and neutral conductors which, in conjunction with the other portions of the differential protection networks: (1) prevents nuisance tripping on the occurrence of high current faults outside the differential protection zone (such as bus faults) due to normal variations of the current transformers, and (2) at the same time, provides differential protection for a generator channel over the required range, generally from very low differential fault currents to the very high differential fault currents. The high differential fault currents will appear as high through current faults for the unfaulted parallel channels.
REFERENCES:
patent: 1731955 (1929-10-01), von Schaubert
patent: 2183537 (1939-12-01), Bostwick
patent: 2696573 (1954-12-01), Patrickson et al.
patent: 3160787 (1964-12-01), Sonnemann
patent: 3259802 (1966-07-01), Steen
patent: 3377551 (1968-04-01), Le Doux
patent: 3654516 (1972-04-01), Traversi
patent: 3729650 (1973-04-01), Cook
patent: 4089033 (1978-05-01), Mentler
Hyvarinen Wayne E.
Rosell Lloyd J.
Salce Patrick R.
Telfer G. H.
Westinghouse Electric Corp.
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