High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Housing structure
Patent
1999-04-07
2000-07-18
Friedhofer, Michael
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Housing structure
218144, 218145, H01H 3316
Patent
active
060910402
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an outdoor high-voltage power circuit breaker with an interrupter unit and a grading capacitor connected electrically in parallel with it.
BACKGROUND INFORMATION
A conventional outdoor h.v. power circuit breaker is described in German Utility Model No. 1 995 069, for example.
In the conventional outdoor power circuit breaker, both the interrupter unit and the grading capacitor are mounted on the upper end of a pole column. The longitudinal axes of the interrupter unit and the grading capacitor are horizontal. The interrupter unit and the grading capacitor are each arranged in a separate porcelain housing.
French Patent No. 1 170 411 describes a high-voltage power circuit-breaker including an insulator housing made of plastic in which a grading capacitor is arranged. The grading capacitor can be partially integrated into the wall of the plastic housing.
SUMMARY OF THE INVENTION
An object of the present invention is to make it simpler and less expensive to manufacture a h.v. power circuit breaker.
This object is achieved according to the present invention by providing a circuit breaker in which the interrupter unit and the grading capacitor are surrounded by a common composite insulator housing made essentially of plastic attached at one of its ends to a supporting pole column.
This design eliminates the need for a separate housing for the grading capacitor. The composite insulator housing is designed to be larger accordingly, so that it can accommodate both the interrupter unit and the grading capacitor. This arrangement nevertheless takes up less space than one with two individual insulator housings. Furthermore, assembly is simplified, because only a single housing need be attached to the end of the pole column. There is also only a single gas space in which both the interrupter unit and the grading capacitor are arranged. This is important in particular when the gas space is filled with a quenching gas such as SF.sub.6 which must be monitored in some form.
A composite insulator housing can be manufactured with a much lower weight than a corresponding porcelain insulator. In comparison with the design with individual porcelain housings, two thirds of the weight is eliminated with a common composite insulator housing.
In accordance with an exemplary embodiment of the present invention, the composite insulator housing is partially relieved of the weight of the interrupter unit and the grading capacitor because one end of the interrupter unit, and the grading capacitor and resistor, are supported by part of a pole column, and, in particular, by a corner gear casing. These components can thus be mounted on the corner gear casing on a flange. The composite insulator housing may also be removed separately without having to also remove from the pole column the grading capacitor and the part of the interrupter unit mounted on the pole column.
An advantageous embodiment of the present invention provides a circuit breaker in which the interrupter unit and the grading capacitor are arranged side by side in parallel with one another.
This permits an especially space-saving arrangement of the interrupter unit and the grading capacitor.
Furthermore, the present invention can be designed to advantage by also arranging in the composite insulator housing a resistor wired in parallel electrically to the interrupter unit.
A closing resistor or tripping resistor or a voltage limiting element can also be accommodated in the composite insulator housing without requiring any extra space.
Another advantageous embodiment of the preset invention provides a circuit breaker in which one end of the interrupter unit and the grading capacitor, and the resistor be supported by part of the pole column, in particular by a corner gear casing.
This design relieves the composite insulator housing of some of the weight of the interrupter unit, the grading capacitor, and the closing resistor. These components can thus be mounted on the corner gear casing, namely on a flange. The co
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patent: 4027125 (1977-05-01), Peek et al.
patent: 4434333 (1984-02-01), Kawasaki
patent: 5039831 (1991-08-01), Sato et al.
patent: 5604340 (1997-02-01), Yamada et al.
patent: 5661282 (1997-08-01), Tsuchiya et al.
Siemens -- Betriebsanleitung, "Leistungsschalter 3AS2", No Date.
Friedhofer Michael
Siemens AG
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