Electricity: electrical systems and devices – Safety and protection of systems and devices – Generator protective circuits
Patent
1975-03-25
1978-01-31
Miller, J D
Electricity: electrical systems and devices
Safety and protection of systems and devices
Generator protective circuits
361 33, 290 40R, 322 23, H02H 706
Patent
active
040718700
ABSTRACT:
Apparatus for generating minimally delayed closing instructions for turbine valves of turbo-generator sets in the event of power system short circuits wherein major faults resulting in a drop in the system voltage are detected and act upon the valve means controlling the fluid flow to the turbine in such manner that a rapid closure of the valve means prevents the turbo-generator from falling out of step in the case of a sustained fault condition. A provisional valve-closing signal is produced upon a predetermined drop in the system voltage but this is cancelled in the event that the ensuing acceleration of the turbo-generator set does not increase to a predetermined level within two revolutions of the set.
REFERENCES:
patent: 2832030 (1958-04-01), Fairweather
patent: 2832031 (1958-04-01), Guth
patent: 3238376 (1966-03-01), Ernst et al.
patent: 3421014 (1969-01-01), Moorganov
patent: 3614457 (1967-06-01), Eggenberger
patent: 3643437 (1972-02-01), Birnbaum et al.
patent: 3836822 (1974-09-01), Schonfeld et al.
patent: 3848138 (1974-11-01), Park
Bloch Heinz
Wirth Ernst
BBC Brown Boveri & Company Limited
Miller J D
Salce Patrick R.
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