Neutral bonding system for uninteruptible power supply

Details Neutral bonding system for uninteruptible power supply Neutral bonding system for uninteruptible power supply

1998-10-27

2000-08-08

Gaffin, Jeffrey

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

361 75, H02J 700, H02H 300

Patent

active

06100605&

ABSTRACT:
A UPS device of universal application provides a pair of backfeed relays, which are mandated by certain countries outside the United States, controlled by an overall control circuit to perform in conjunction with the connection of neutral to system ground to avoid damage to a load, UPS and power utility. The control circuit is responsive to an anomaly in the power supply of a power utility to enter a backup mode wherein power is supplied by a battery power supply through an inverter to the load. Entry into backup mode occurs with a delay-based switching logic which governs the control circuit's operation of the backfeed relays and formation of the neutral to system ground connection.

REFERENCES:
patent: 3809963 (1974-05-01), Hutchinson
patent: 4782241 (1988-11-01), Baker et al.
patent: 5055703 (1991-10-01), Schornack
patent: 5834858 (1998-11-01), Crosman, III et al.
patent: 6023400 (2000-02-01), Nevo

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