Automatic transfer control device and voltage sensor

Details Automatic transfer control device and voltage sensor Automatic transfer control device and voltage sensor

1976-07-19

1978-06-20

Dobeck, B.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 66, 307 70, 307 80, 307 81, 307 87, H02J 900

Patent

active

040963950

ABSTRACT:
An automatic transfer control device for selectively energizing an electrical distribution system from a pair of electrical power sources. The device includes voltage sensors for sensing electrical conditions on each of the sources. The device may be used on either three-wire or four-wire systems. The voltage sensors comprise an operational amplifier for artificially generating a phase-to-phase voltage from two phase-to-ground voltages. The artificially generated voltage is used to detect sequence reversal on the sources being monitored. Separate means are provided to select a source from which to draw control power for the device, the control power criterion being different from the transfer criterion.

REFERENCES:
patent: 3337742 (1967-08-01), Baehr et al.
patent: 3495130 (1970-02-01), Bruner et al.
patent: 3535591 (1970-10-01), Holmquest
patent: 3736470 (1973-05-01), Ford et al.

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