Combination transfer and bypass isolation switch utilizing drawo

Details Combination transfer and bypass isolation switch utilizing drawo Combination transfer and bypass isolation switch utilizing drawo

1993-12-17

1996-12-03

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

200 5009, 307 85, 361615, H02J 700

Patent

active

055811337

ABSTRACT:
An apparatus selectively connects a normal power line and an emergency power line to a load, and includes two interlocked switching mechanisms, each having individual interlocks, for selectively connecting the power lines to the load, and an interlock mechanism for interlocking the switching mechanisms in order that only one of the power lines at a time is connected to the load. The switching mechanisms may each have two drawout cassettes including associated switching devices for switching the power lines to the load and, also, including an isolated position for isolation of the associated switching device from at least one of the switched power lines and the load. Each switching device may be a circuit breaker having a trip unit for sensing current flowing from a power line to the load and tripping the circuit breaker. The interlock mechanisms may include keylock mechanisms which selectively disable closing of the switching devices. Each keylock mechanism may have individual locks on associated cassettes and a single key for operating only one of the locks. The individual interlocks of the switching mechanisms may cooperate with the keylock mechanisms to selectively disable connection of a power line to the load. Each key may be retained by an unlocked associated lock and may be removed from a locked associated lock.

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patent: 5023469 (1991-06-01), Bassett et al.
patent: 5081367 (1992-01-01), Smith et al.
patent: 5200586 (1993-04-01), Smith et al.
Westinghouse Transfer Switch Equipment (Type ATSBI Combination Bypass Isolation and Automatic Transfer Switches); Jun. 1991; London, KY 40741; pp. 1-8.
Westinghouse Transfer Switch Equipment (Type ATSRD Drawout Transfer Switches); Aug. 1991; London, KY 40741; pp. 1-8.
Kohler Transfer and Bypass Isolation Switches; 1983; Kohler, WI 53044; pp. 1-20.
Zenith ZBTS Bypass-Isolation Transfer Switches; Sep. 1988; Chicago, IL 60609; pp. 1-4.
Russelectric Power Control Systems (Bypass/Isolation Switches); Jul. 1987; Hingham, MA 02043; pp. 1-4.

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