Electrical transmission or interconnection systems – Switching systems – Plural switches
Patent
1976-02-17
1978-05-30
Hix, L. T.
Electrical transmission or interconnection systems
Switching systems
Plural switches
361333, H02B 1306
Patent
active
040925471
ABSTRACT:
A prefabricated unitary switch block for use with a multi-phase power circuit bus, a multi-phase load circuit and an automatic circuit recloser for protecting the bus and load circuit against overloading. The switch block comprises a plurality of external bus terminals and a plurality of external load terminals. Additionally, the switch block carries a plurality of selectively operable bus-side disconnect switches, each having a terminal connected internally of the switch block to a corresponding one of the external bus terminals and a terminal connected to a corresponding terminal of the circuit recloser. The switch block also carries a plurality of selectively operable load-side disconnect switches, each having a terminal connected to a corresponding one of the external load terminals and a terminal connected to a corresponding terminal of the circuit recloser. In one embodiment, the switch block further comprises a plurality of selectively operable by-pass switches. Each by-pass switch has one terminal connected externally of the switch block to a corresponding one of the bus-side disconnect switch terminals, and another terminal connected internally of the switch block to a corresponding one of the load terminals. Operation of the by-pass switches selectively by-passes the automatic circuit recloser. In another embodiment, a multi-phase transfer bus is provided and the switch block further includes a plurality of external transfer bus terminals. Each of the external transfer bus terminals is connected to a corresponding one of the transfer bus multiple phases. The switch block includes a plurality of selectively operable bus transfer switches. Each of the bus transfer switches has a terminal connected externally of the switch block to a corresponding one of the load-side disconnect switch terminals, and a terminal connected internally of the switch block to a corresponding one of the transfer bus terminals. Opening of the bus-side or load-side disconnect switches and closing of the bus transfer switches allows the load circuit to draw power from the transfer bus.
REFERENCES:
patent: 1709780 (1929-04-01), Davies
patent: 1735179 (1929-11-01), Randall
patent: 1786830 (1930-12-01), Davies
patent: 1879000 (1932-09-01), Ainsworth
patent: 1906421 (1933-05-01), Rossman
patent: 2047000 (1936-07-01), Calvert
patent: 3787711 (1974-01-01), Bright
patent: 3823346 (1974-07-01), Olsen
Hix L. T,.
Schreyer Stafford D.
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