High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Air-current blowout
Patent
1995-04-11
1996-10-08
Brown, Brian W.
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Air-current blowout
218 65, 218 50, H01H 3388
Patent
active
055633897
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns a high-voltage power switch with an arc contact and a separate rated current contact, the moving part of which takes the form of an external hollow cylinder to delimit a storage space for a pressurized quenching gas.
For high-voltage power switches it is common that an electric arc, formed during switching off, is drawn via an arc contact, while the rated currents are conducted by a separate rated current contact. When such a high-voltage power switch must blow quenching gas such as sulfur hexafluoride into the separating gap, the rated current contact may, at least partially, form a storage space that is required for storing the pressurized quenching gas. The storage space proper can be pressurized via the are and/or designed as a movable part of a compressor means for a quenching gas.
In all cases, the rated current contact can be moved by the drive mechanism of the high-voltage power switch and must be kept light in weight in order to keep the required driving power low.
SUMMARY OF THE INVENTION
A rated current contact for a high-voltage power switch of the aforementioned type can be designed to be lightweight according to the present invention by constructing the hollow cylinder from a one-piece precision casting made of contact material, the jacket of which is stiffened by three inwardly projecting flange-like projections.
By using the present invention, the cylinder jacket can be made thin-walled, since the deforming forces acting upon the cylinder jacket at the pressures present cause no deformation of the jacket surface thanks to the stiffening projections.
In an advantageous embodiment of a high-voltage power switch according to the invention, the first flange-like projection is formed as an attachment flange for coupling to the reciprocatingly movable drive mechanism. It can be advantageous if the second, middle projection is provided for attaching an insulating material nozzle traversed by the arc contact and for forming a bottom of a storage space for supplying the insulating nozzle. Furthermore, it has proved advantageous that the third projection, forming the free front end, be built as an electrode for evening out the electric field between the open contacts.
When high pressures are expected in the storage space, it is advantageous if the cylinder jacket is provided with internal stiffening strips, which also conduct rated current and run basically parallel to the cylinder generatrix between the second and third projections.
In a preferred embodiment of the high-voltage power switch according to the invention, the second projection is formed so that it protrudes farthest into the hollow cylinder in relation to the two other projections.
In all embodiments, a CuCr alloy is provided as contact material for reasons of availability.
BRIEF DESCRIPTION OF THE DRAWINGS
An embodiment of a high-voltage power switch is described and its operation explained using the drawing.
The lone figure shows the partial section of a high-voltage power switch, where only the parts required for understanding the present invention are illustrated, without the outer boundary of the switch chamber and without the drive, which is at ground potential.
DETAILED DESCRIPTION
The high-voltage power switch according to the present invention has an arc contact 1 consisting of a fixed arc switching component 2 and a movable arc switching component 3, between which an arc is drawn during switch-off. For this purpose, movable arc switching component 3 is moved in the direction of arrow 4 by a drive mechanism 5. Spatially separated from this arc contact 1 there is provided a rated current contact 6, which has two fixed switching components 7 and 8 and a movable bridging circuit component 9. This bridging circuit component 9 is made of a CuCr alloy and is designed as a one-piece precision casting. As the figure shows, bridging circuit component 9 has basically the shape of a hollow cylinder, jacket 10 of which delimits a storage space 11 for a pressurized quenchi
REFERENCES:
patent: 4434336 (1984-02-01), Garzon
patent: 4511775 (1985-04-01), Korner et al.
patent: 4565911 (1986-01-01), Slamecka
Lehmann Volker
Marin Heiner
Brown Brian W.
Friedhofer Michael A.
Siemens Aktiengesellschaft
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