A.C. electrical power supply system with a back-up power supply

Details A.C. electrical power supply system with a back-up power supply A.C. electrical power supply system with a back-up power supply

1991-09-24

1993-11-23

Gaffin, Jeffrey A.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 64, 307 87, H02J 900

Patent

active

052647323

ABSTRACT:
An auxiliary generator supplies a sinusoidal voltage of fixed amplitude adjusted in phase to the mains supply voltage. A comparator, followed by a threshold circuit and a bistable switch, enables a static contactor to be opened almost instantaneously when the difference between the voltages of the mains supply and of the generator exceeds a certain preset value. Power is then supplied by an auxiliary back-up power supply.

REFERENCES:
patent: 4065711 (1977-12-01), Kawabata
patent: 4473756 (1984-09-01), Brigden et al.
patent: 4782241 (1988-11-01), Baker et al.
patent: 4866295 (1989-09-01), Leventis et al.
patent: 4935861 (1990-06-01), Johnson, Jr. et al.

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