Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1978-07-24
1983-05-17
Schreyer, Stafford D.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307 70, 307 80, 307 87, H02J 900
Patent
active
043842135
ABSTRACT:
An automatic control transfer device for selectively energizing an electrical distribution system from a pair of electrical power sources. The device includes means for sensing electrical conditions on both of the sources and programmable electronic digital logic to selectively energize associated circuit interrupters for switching a distribution system between the two sources. A plurality of time delay functions are provided utilizing a separate oscillator for each function, each oscillator providing input to a common digital counter. The device senses the status of associated circuit interrupters to provide interlocking and lockout functions as well as proper switching commands for either two- or three-circuit interrupter systems. Means are also provided for testing the entire device without initiating an actual source transfer.
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Converse, Jr. Robert E.
Schreyer Stafford D.
Westinghouse Electric Corp.
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