Electricity: electrical systems and devices – Safety and protection of systems and devices – Generator protective circuits
Patent
1994-11-22
1996-02-27
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Generator protective circuits
361 79, H02H 706
Patent
active
054953812
ABSTRACT:
A system of protection for an electric power generating system having a poly-phase generator switchably coupled through a generator control breaker to a load distribution bus, wherein the generator output voltage is controlled by a generator control unit which utilizes isolated voltage and current sense signals having a magnitude proportional to the output voltage and current for each phase of the poly-phase generator, the isolated voltage and current sense signals being generated by isolated voltage and current sensors, comprises a first circuit for monitoring the magnitude of each of the isolated voltage sense signals and generating a first output control signal if the magnitude of any isolated voltage sense signal is below a first predetermined threshold. The system further comprises a second circuit for monitoring the magnitude of each of the isolated current sense signals and generating a second output control signal if the magnitude of any isolated current sense signal is below a second predetermined threshold. A logic circuit is included which is responsive to the first and the second control signals, and to the generator control breaker for generating a protective trip signal for de-exciting the generator and opening the generator control breaker. Preferably, this signal is delayed for a predetermined period of time which is set to a value based on maximum generator output voltage and applicable standards for abnormal voltage transients to ensure that the standards are not exceeded by the maximum generator output voltage.
REFERENCES:
patent: 3612982 (1971-10-01), Jones et al.
patent: 3631321 (1971-12-01), Eisenstadt
patent: 3699431 (1972-10-01), Paddison et al.
patent: 3963964 (1976-06-01), Mustaphi
patent: 4839575 (1989-06-01), MacFarlane
patent: 4933803 (1990-06-01), Kalivas
patent: 5206776 (1993-04-01), Bodenheimer et al.
Good Jef W.
Mrowiec David J.
Makeever Jeffery J.
Pellinen A. D.
Sherry Michael J.
Sundstrand Corporation
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