Bbc Brown, Boveri & Company, Limited

Other

Abb Research Ltd.

Asea Brown Boveri Ag

Jiri Talir

Walter Bischofberger

Heinz Eichholzer

Werner Graber

Klaus Bohnert

Philippe Gabus

Hubert Brandle

Jadran Kostovic

Edgar Hochspach

Werner Luthi

Heinz Eicholzer

Roger Muller

The subject matter of the present invention is a fiber-optic outdoor high-voltage sensor 1. The known sensor principle is based on the fact that a piezoelectric quartz cylinder 3 wound with a glass fiber 4a effects a voltage-proportional fiber strain which is measured interferometrically. According to the invention, a 420 kV outdoor sensor 1 is created by virtue of the fact that several quartz cylinders 3 and electrically conductive spacing elements 5 are arranged in an alternating fashion one behind another and are sealed in a silicone-shielded 17 insulating tube 16 by means of polyurethane 18 or silicone 21. Dividing the high voltage between several spaced, E-field integrating sensor elements 2 permits simple field control and a very high measuring accuracy. In addition, the fiber-optic voltage sensor 1 is distinguished by a low outlay on insulation, compactness and low weight, and can easily be scaled to other voltage levels and be effectively combined with optical current sensors 38.

Fiber-optic voltage sensor for outdoor high-voltage installations

The power circuit-breaker is provided with at least one arcing chamber which extends along a central axis and has at least one power interruption point with at least one contact which is moved by a drive. A closing resistor is connected in series with the power interruption point, having a resistive contact which is connected in parallel with the closing resistor and which closes after the power interruption point during the connection operation and opens after the power interruption point during the disconnection operation. This power circuit-breaker has a closing resistor and a resistive contact which has a simple and space-saving structure and which accurately timed actuation of the resistive contact is achieved. The resistive contact is mechanically connected to the at least one moving contact rectilinearly along at least one axis. Also, a coupling element is interposed in the rectilinear mechanical connection, and the coupling element is designed in such a way that it effects a time delay both during the connection operation and during the disconnection operation.

Rower circuit-breaker having a closing resistor

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

Two series-connected main switching contacts (1a, 1b) mounted on a housing (7) are actuated, in conjunction with an auxiliary switching unit (4) for switching a closing or starting resistance (3), by a drive (5) via a switching drive mechanism (6). To obviate the need for a second auxiliary switching unit and to achieve other cost reductions, the closing resistance (3) and the auxiliary switching unit (4) are connected in a parallel circuit and in series between the main switching contacts (1a, 1b). The foregoing components are accommodated in the housing (7). During a switching-on process, the auxiliary switching unit (4) closes after the main switching contacts close (1a, 1b) and the closing resistance (3) is bypassed. During the switching-off process, the auxiliary switching unit opens after the main switching contacts (1a, 1b). A hollow cylinder (21) which carries a moving contact member (9) of the auxiliary switching unit (4), is displaceable to a limited extent with respect to a guide rod (16) of the switching drive mechanism. The hollow cylinder is pushed by a plunger (17) on the guide rod (16) and by a ramming piston (18) into an on position at which the moving contact member (9) locks into a fixed contact member (10). During the switching-off process, the locking mechanism, which can normally withstand a counter force exerted by a tension spring (27), is released by the plunger (17). In another embodiment, the moving contact member of the auxiliary switching unit is constructed as a blade contact which is pivoted on the metal housing.

High-voltage switch

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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Buchs, Switzerland

Jiri Talir