High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Air-current blowout
Patent
1996-07-09
1998-04-21
Gellner, Michael L.
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Air-current blowout
218 60, H01H 3388
Patent
active
057420165
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an electrical gas-blast switch.
BACKGROUND INFORMATION
An electrical gas-blast switch is shown in German Patent Application No. 32 31 169 in which the magnetic effect of the break current is utilized for compressing a quenching gas. However, the quenching gas compressed in such a way is released at a disadvantageous point in time.
In another electrical gas-blast switch shown in German Patent Application No. 40 10 007, at least one fixed contact piece can be linked with a connector, as necessary, via a switching piece which can be moved by a drive. A compression device with a compression piston and a compression cylinder surrounds the arc space which exists between the contact piece and the connector piece. During the cut-off process, the compression piston is moved relative to the compression cylinder, causing the compression space delimited by them to be reduced. In order to utilize the magnetic effect of the break current to support the drive, an armature is linked with the compression piston via a rod. After the compression cylinder has been moved a certain path distance during the cut-off process, in the sense of contact separation, the armature, which is structured as part of the piston rod and consists of ferromagnetic material, gets into the region of influence of the magnetic field of a stator excited by the break current. At this moment, the compression piston is accelerated counter to the movement of the compression cylinder, and causes an increase in the quenching gas pressure during the cut-off process.
A variation of a drive support by means of the magnetic effect of the break current, as described in German Patent Application No. 40 10 006, contains at least one armature attached to the compression cylinder, which dips into a slit of a yoke during the cut-off process, after a partial movement distance of the compression cylinder, and supports the compression cylinder movement from this time on.
In another gas-blast switch shown in German Patent No. 31 41 324, the rated current flows via the compression cylinder. Only after a partial movement of the compression cylinder during the cut-off process does the break current commutate to a gradient coil, which produces movement of a ring piston which directly supports the arc blasting.
SUMMARY OF THE INVENTION
The present invention provides a gas-blast switch which includes at least one fixed contact piece and a switching piece which can be moved by a drive. The electrical gas-blast switch also includes a compression device with a compression piston and a compression cylinder, at least one of which can be moved by the drive during the cut-off process, where the drive starts from a cut-in position, reducing a compression space delimited by the compression piston and the compression cylinder. The gas-blast switch also includes an armature which can be moved axially by the magnetic field of a stator which can be excited by the break current, where a drive piston which delimits a compression chamber is mechanically linked with the armature, and where 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 of the compression device.
An object of the present invention is to provide a gas-blast switch which allows blasting of the arc at a comparatively slight stroke of the compression cylinder, with a relatively high initial quenching pressure.
The aforementioned object is accomplished according to the present invention in that the side of the compression piston facing away from the compression space has the compression chamber pressure acting on it, so that a compression chamber pressure increase causes a movement of the compression piston in the direction toward the compression cylinder.
An advantage of the present invention is that a short-circuit or break current which occurs produces the axial movement of the armature before the switch is triggered in the cut-in position of the compression device. This causes
REFERENCES:
patent: 3549842 (1970-12-01), Fischer
patent: 3745281 (1973-07-01), Yoshioka
patent: 3872272 (1975-03-01), Yoshioka
patent: 4041263 (1977-08-01), Noeske
patent: 4209679 (1980-06-01), Koppl et al.
patent: 4511775 (1985-04-01), Korner et al.
patent: 5285036 (1994-02-01), Lorenz
Frienhofer Michael A.
Gellner Michael L.
Siemens Aktiengesellschaft
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