High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Air-current blowout
Patent
1996-09-24
1998-03-17
Tso, Edward
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Air-current blowout
H01H 3388
Patent
active
057289883
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a high-voltage power switch.
BACKGROUND INFORMATION
A conventional high-voltage power switch is described in German Application No. 21 40 284. In this power switch, a field electrode is embedded in the compression cylinder. Due to the fact that the compression cylinder extends into the gap in a switched-off position, the gap is exposed to a high dielectric load through this field electrode.
In another conventional high-voltage power switch described in German Application No. 42 17 232, a first field electrode is formed by a bottom of the movable compression cylinder. In the switched-off state, the compression cylinder bridges the gap, so that the compression cylinder bottom (configured as a field electrode) coaxially surrounds one of the contact pieces in a switched-off state, while the fixed compression piston surrounds the other contact piece.
It is disadvantageous, especially in the case of very high voltages, to have the gap bridged by one insulating solid body, as in the case of known devices.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a high-voltage power switch, wherein, on the one hand, field electrodes are provided around the gap area to make the electric field more uniform and, on the other hand, the gap has the highest possible dielectric strength in the switched-off state.
This object is achieved according to the present invention by configuring the compression piston as a second field electrode and the compression piston is drivable in the direction of the second contact piece.
A high-voltage power switch according to the present invention includes first and second contact pieces that delimit an air gap in the switched-off state, a compression piston that surrounds the first contact piece, a drivable compression cylinder that surrounds the second contact piece in the switched-on state, and a first field electrode that surrounds the second contact piece in the switched-off state and is axially movable in relation thereto. The first field electrode is separate from the compression cylinder and axially movable in relation thereto. The compression cylinder is positioned at a predefined distance from the second contact piece in the switched-off state. In addition, the first field electrode is spring-loaded axially in the direction of the compression cylinder, with a stop being provided which limits the motion of the first field electrode toward the gap.
By separating the first field electrode from the compression cylinder, the latter can be removed from the second contact piece during switch-off so that it does not bridge the gap in the switched-off position. Starting at the time when the compression cylinder is separated from the second contact piece, at the latest, the first field electrode can be brought into the electrically most advantageous position in the area of the second contact piece.
In the switched-on position, the first field electrode can then be moved axially to make space for the compression cylinder. Thus, in the switched-off state, an optimum dielectric strength of the gap is obtained, without hindering the motion of the compression cylinder.
The spring load represents the drive for the field electrode. During the switching-off process the field electrode follows the compression cylinder when the latter is withdrawn until the field electrode reaches the stop limiting its motion and determining its end position.
When the switch is switched on, the compression cylinder is pushed forward. The compression cylinder pushes back the first field electrode against the spring force until the end position of the compression cylinder is reached.
The compression piston (configured as a second field electrode) surrounds the first contact piece, so that in the switched-off state each of the contact pieces is surrounded by a field electrode. Thus a symmetrical configuration of the electric field is obtained in relation to the gap, which increases the dielectric strength of the gap.
Another advantageous
REFERENCES:
patent: 3739124 (1973-06-01), Richter et al.
patent: 4149054 (1979-04-01), Kopplin
patent: 4445014 (1984-04-01), Gruner et al.
patent: 5285036 (1994-02-01), Lorenz
patent: 5563389 (1996-10-01), Marin et al.
Gilmozzi Gunther
Janicke Lutz-Rudiger
Kynast Edelhard
Meinherz Manfred
Siemens Aktiengesellschaft
Tso Edward
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