Regulated alternator with positive fault related shut down appar

Details Regulated alternator with positive fault related shut down appar Regulated alternator with positive fault related shut down appar

1986-08-15

1988-08-16

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Generator protective circuits

361 56, 361 57, 361 86, 361 87, 361 92, 361 94, 322 24, 290 40B, 290 40C, H02H 706

Patent

active

047648384

ABSTRACT:
A permanent magnet generator and rectifier is connected to the exciter of an alternator and a separate rectifier provides a D.C. voltage supply to a voltage regulator. A thyristor is connected in series with a second fuse across the exciter rectifier to short circuit the supply in series with a main external fuse. If the main fuse fails to open, the second fuse opens. The second fuse is potted in the regulators to prevent tampering. An overexcitation and a low voltage demand signal are sensed. The two signals are coupled to a NAND logic gate to produce an output shut-down signal. If either even is established and the first produces a signal, a shut-down signal is generated to a second comparator amplifier of latch circuit. A delay circuit connects the shut-down signal to a triggered oscillator for firing the thyristor. A voltage detector senses the rectified voltage on the thyristor and holds the oscillator off until an appropriate voltage exists to insure operation of the voltage regulator and the safety circuit. The oscillator develops a high peak, narrow current pulse for driving the thyristor fully on to trip one of the fuses.

REFERENCES:
patent: 3042850 (1962-07-01), Kern
patent: 3938005 (1976-02-01), Cummins
patent: 4096429 (1978-06-01), Carter
patent: 4335344 (1982-06-01), Gant
patent: 4410848 (1983-10-01), Frierdich

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