High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Air-current blowout
Patent
1998-01-09
1999-08-03
Donovan, Lincoln
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Air-current blowout
218154, H01H 3304, H01H 930
Patent
active
059328584
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to stored-energy mechanisms for high-voltage circuit-breakers filled with insulating gas.
BACKGROUND INFORMATION
In a stored-energy mechanism described in the brochure "SF.sub.6 Outdoor Circuit Breakers from 72.5 to 420 kV" of the Sprecher & Schuh company, which can be used both for individual circuit-breaker poles and for three-pole circuit breakers, the drive shaft is arranged outside the insulating gas chamber in a separate drive housing, which also contains the closing spring and the corresponding drive elements. A knuckle joint system with corresponding traction rods is provided for coupling the drive shaft to the circuit breaker, with the shaft of the knuckle joint traversing the wall of the carrier block in a gas-tight manner.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a stored-energy mechanism that is of a simple design, cost-effective, and compact.
The present invention provides a stored-energy mechanism for a high-voltage circuit-breaker pole filled with an insulating gas with a drive rod that transmits a drive movement to an interrupter unit by thrust or traction and is coupled for this purpose to a drive shaft actuated by both a closing spring and an opening spring, and is to be used in the constructive design of stored-energy mechanisms comprising a plurality of drive elements wherein the closing spring is coupled to a closing shaft and the closing shaft actuates the drive shaft via a cam plate and a closing crank actuates the drive shaft. A housing-type carrier block seals the isolating gas chamber from the outer chamber, the carrier block forming the end support for the opening spring. A drive element traverses a housing wall of the carrier block in a gas-tight manner.
To achieve the forementioned object, it is provided according to the invention that the drive shaft forms the drive element traversing a housing wall of the carrier block in a gas-tight manner and is directly connected to the drive rod via a drive crank, the opening spring is also directly connected to the drive shaft via an opening crank, and the carrier block also carries the bearing of the closing shaft and forms the end support of the closing spring.
In the design according to the present invention, all drive elements of the stored-energy mechanism are placed and/or mounted on the carrier block, with the drive rod being directly connected to the drive shaft. No other components to support the closing and opening springs, for example, are needed for the operation of the mechanism. The mechanism can be pre-assembled and then only has to be inserted in a housing if needed. This housing will accommodate both the circuit breaker itself and the articulated-shaft mechanism, so that no separate housings are needed for the circuit breaker and the articulated-shaft mechanism. The carrier block itself carries, for example, a ceramic insulator, in the case of an open-air circuit breaker, or is flanged directly to the metal enclosure of an enclosed high-voltage switching device. Also in this case, the carrier block supports the entire mechanism. It can be designed as a single-piece casting, for example.
The arrangement of the closing, opening, and drive elements according to the invention further allows the stored-energy mechanism to be arranged in a particularly compact manner, for example, by also arranging the closing spring and the opening spring outside the insulating gas chamber and by arranging the closing spring and/or the opening spring in parallel to the longitudinal direction of the drive rod. This design also allows the closing energy of the closing spring to be transferred to the closing shaft via a rotating crank and from there to a crank of the drive shaft via a cam plate in the shortest possible way.
The carrier block used according to the invention can advantageously have a plate on its side facing the interrupter, which plate overlaps the contours of the other drive components in the directions perpendicular to the longitudinal
REFERENCES:
patent: 3857006 (1974-12-01), Daimon et al.
patent: 4612428 (1986-09-01), Nicoloso
patent: 4654494 (1987-03-01), Wuethrich
patent: 5512724 (1996-04-01), Binder et al.
"SF6-Leistungsschalter fur Bahnstromnetze der Deutschen Bundesbahn und der Schweizerischen Bundesbahn", Elektrische Bahnen, Sep., 1989*.
Donovan Lincoln
Siemens Aktiengesellschaft
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