Bbc Brown, Boveri & Company, Limited

Heinz Eichholzer

Walter Bischofberger

Jiri Talir

Werner Graber

Edgar Hochspach

Werner Luthi

The high-voltage switch with a closing resistor has a main switch point and, parallel to this, an auxiliary switch point, the closing resistor (19) being in series with the auxiliary switch point. A movable contact (17) of the auxiliary switch point is driven via a thrust-crank drive (16), in such a way that it closes before the main switch point and opens again after the main switch point has closed. In this high-voltage switch, the object is to achieve a cycle of movement which, while ensuring a saving of components of the drive, can be adapted in a simple way to differing network conditions. This is achieved because the thrust-crank drive (16) has a compressible joint (23), and because the movable contact (17) is coupled to two impact rings (34, 35) which interact with two stops (36, 37). When the auxiliary switch point is already closed, the first impact ring (34) strikes against the first stop (36), and the compressible joint (23) is guided from the first stable position beyond a dead center position into a second stable position. At the same time, the movable contact (17) moves somewhat in the opening direction and opens the auxiliary switch point.

High-voltage switch with a closing resistor

Between a fixed contact member (2) having a rated-current contact and a fixed arcing contact (3) which acts in conjunction with a moving contact member (4) having a moving rated-current contact (5) and moving arcing contact (6), and a first flange (7) an insertion resistance (8) is arranged. In order to save a further pair of contacts, the rated-current contact of the fixed contact member (2) is constructed as a sliding rated-current contact (14) which can be displaced in the switching-on direction by the moving contact member (4). During the switching-on process, it is first contacted by the moving rated-current contact (5) which creates a current path including a resistance contact (9) and the insertion resistance (8). A little later, the insertion resistance (8) is bridged when the moving arcing contact (6) comes into contact with the fixed arcing contact (3), which is connected to the first flange (7) by means of a conductor (20). In the further course of the switching-on movement, the sliding rated-current contact (14) runs onto a rated-current bridging contact (19) and establishes a rated-current path. During the switching-off process, a vacuum damping arrangement (17) causes the sliding rated-current contact (14) to trail the moving contact member (4) with delay so that the rated-current contacts separate before the arcing contacts.

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Thalwil, Switzerland

Heinz Eichholzer