Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1975-05-30
1976-07-27
Hohauser, Herman
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
H02J 900
Patent
active
039719570
ABSTRACT:
In an electrical system having two power sources, one being an inverter and the other being a commercial power souce, where the load is critical and is normally connected to the inverter, a load transfer control system is provided to assure uninterrupted power supply to the load in the event of inverter failure. The load transfer control system includes a fault detector connected to the inverter, a fast-acting and normally open switch connected to the commercial power source and the load, and a slower acting and normally closed switch connected to the inverter and the load. When an inverter fault is sensed, there is a momentary make-before-break switch action of the two switches. A ferroresonant circuit is in the inverter circuit, and has a storage element with enough energy storage capacity to carry the load during the period that it takes for the fault detector to operate and the first switch to close. The switches are contactors or similar devices, so that there is complete voltage and current isolation of one power source from the other when the respective switch is open.
REFERENCES:
patent: 3612894 (1971-10-01), Schmidt
Hewson Donald E.
Hohauser Herman
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