Control panel for automatic transfer switch

Details Control panel for automatic transfer switch Control panel for automatic transfer switch

1978-12-01

1980-02-19

Hix, L. T.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 68, H02J 908

Patent

active

041896491

ABSTRACT:
A control panel, formed entirely of solid state components, for an automatic transfer switch which alternatively connects a load to a normal source of power or starts up an emergency source of power and connects the load to it. The control panel includes monitors for the normal and emergency sources, the monitors having a pickup voltage and a lower dropout voltage, relays for initiating operation of the emergency or normal sources when the normal source drops below the dropout level or the emergency source rises above the pickup voltage or frequency level, and time delay circuits between the monitors and the relays preventing operation of the relays unless the voltage levels exist beyond the time periods provided.

REFERENCES:
patent: 2785317 (1957-03-01), Langberg et al.
patent: 3300651 (1967-01-01), Larsen
patent: 3351770 (1967-11-01), O'Sullivan et al.

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