High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Air-current blowout
Patent
1996-07-19
1998-01-06
Scott, J. R.
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Air-current blowout
218 57, 218 62, 218 78, H01H 3388, H01H 33915
Patent
active
057057818
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an electrical gas-blast switch.
BACKGROUND INFORMATION
German Patent Application Nos. 40 10 006 and 40 10 007 describe gas-blast switches which include a switching piece which can be moved by a drive, which connects a fixed contact piece with a connector piece through which load current flows in the cut-in state (cut-in position). The compression device in such gas-blast switches includes a compression piston and a compression cylinder which enclose a compression space. During the cut-off process, the piston and the cylinder are moved relative to one another. Any quenching gas located in the compression space is thus compressed, and serves to blast the arc which occurs when the switching piece moves away from the contact piece. SF.sub.6, for example, is used as the quenching gas. In order to utilize the magnetic effect of the cut-off or short-circuit current to support the drive, the contact arrangement is partially surrounded by a stator which consists of ferromagnetic material and has at least one continuous slit. The compression cylinder shown in German Application No. 40 10 006 or the compression piston shown in German Application No. 40 10 007 each has at least one rod-shaped armature. Only after a partial movement of the compression cylinder during the cut-off process does the armature get into the region of influence of the magnetic field of the stator excited by the break current, which draws the armature into the slit of the stator, supporting the drive. The drive-supporting axial movement of the armature, which does not start until after the beginning of the compression cylinder movement, is therefore not available for the initial acceleration of the compression cylinder.
In another known gas-blast switch illustrated in German Patent No. 31 41 324, the rated current flows via the compression cylinder. During the cut-off process, the break current commutates to a gradient coil after a certain movement distance of the cylinder, and causes the movement of a ring piston which directly supports the arc blasting.
Another gas-blast switch is described in U.S. Pat. No. 4,438,308 which describes a gas-blast switch in which an auxiliary blast effect due to contraction of the spring windings as a result of the break current only starts after the compression cylinder has been significantly moved by a drive.
SUMMARY OF THE INVENTION
The present invention provides a gas-blast switch which includes a contact arrangement which includes a fixed contact piece, a connector piece and a switching piece which can be moved by a drive, with a compression device to produce a blast of quenching gas. The gas-blast switch also includes a compression piston and a compression cylinder which can be moved relative to one another by the drive during the cut-off process, starting from a cut-in position, and a stator which can be excited by the break current, the magnetic field of which causes a drive-supporting axial movement of at least one armature.
An object of the present invention is to provide a gas-blast switch in which the magnetic effect of the break current is already almost completely available, particularly at the beginning of the cut-off movement of the compression cylinder, and which allows a rapid switching movement with a comparatively slight necessary drive power.
The aforementioned object is accomplished according to the present invention with a gas-blast switch having an energy accumulator in the form of a compression chamber where a piston/cylinder system is provided, the movable element of which is mechanically linked with the armature. The armature and the stator are arranged in such a way that the magnetic field already causes the armature to move in the cut-in position, and that the energy accumulator is arranged in such a way that discharge of the energy accumulator acts to support the drive. The (short-circuit) current, which is significantly increased, for example, in case of a short-circuit, causes an armature movement even before the gas-b
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patent: 3902031 (1975-08-01), McConnell
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patent: 4438308 (1984-03-01), Korner et al.
patent: 4511775 (1985-04-01), Korner et al.
patent: 4524257 (1985-06-01), Slamecka
patent: 4553004 (1985-11-01), Thuries
patent: 5285036 (1994-02-01), Lorenz
Habedank Ulrich
Rolff Klaus-Peter
Scott J. R.
Siemens Aktiengesellschaft
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