Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1987-11-09
1990-09-11
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307 87, H02J 900
Patent
active
049565630
ABSTRACT:
A battery operated standby inverter power supply uses an electromechanical relay switching network to connect and disconnect line power between input and output terminals. An overcurrent relay pulser rapidly opens the switching system relay contacts upon transition to battery mode, and a breakover diode network accelerates field collapse in the relay coil attendant to reversion of the relay to its normally closed condition attendant to each battery to line transition. A fault detector establishes acceptable line voltage thresholds, the exceeding of either of which triggers operation from line to battery mode. These triggering thresholds are automatically pulled closer together during initial system startup. An overload detector senses the load current in line mode and prevents actuation to battery mode if the load connected to the power supply output exceeds the rated current value of the inverter. A wiring detector prevents initial power-up to line mode in the event that the house wiring has been miswired so as to interchange the house ground and the voltage return lines.
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Logan Sharon D.
Perma Power Electronics, Inc.
Shoop Jr. William M.
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