Bbc Brown, Boveri & Company, Limited

Karl Munzinger

Friedrich Pinnekamp

Andreas Plessl

Jan G Vit

Jorg Peter

Denis Poole

The switching system, preferably suitable for distributing electric energies of medium-high voltage, includes a metal housing which is filled with insulating gas and in which at least one circuit breaker, one isolating switch, one earthing or grounding system and one busbar are arranged. In this arrangement, the contact arrangement of the circuit breaker is located in a housing which is accessible from the outside without intervention in a busbar housing which contains the busbar. This system saves parts and has a small space requirement while its components subject to the most wear are easy to maintain. This is achieved by the fact that the contact arrangement of the isolating switch is provided in the busbar housing and that the housing of the circuit breaker is provided with a housing part of insulating material which penetrates the wall of the busbar housing as a gas-tight current lead-through. In a system of three-phase design, the volume of the busbar housing is additionally reduced by the fact that the three phase conductors of the busbar are helically wound around a common axis.

Metal-encapsulated gas-insulated switching system

A cast housing is provided for carrying switchgear components, such as a power switch or circuit-breaker, a busbar, a disconnecting switch and a grounding switch and bushings, to a multi-phase medium-voltage switchgear. It is substantially cuboid-shaped and is filled with an insulating gas. This cast housing is designed such that it may be used without substantial modifications in all possible designs of switchgear for a given switchgear voltage. This is achieved by the cast housing having large openings at the front wall and at the side surfaces adjoining the front wall and having a comparatively small opening at each of the rear walls and the top and bottom surfaces for each phase of a switchgear having from one to four phases. At the same time, the supply terminals of the phases of the power switch or circuit-breaker can be brought through the opening located in the front wall into the interior of the cast housing, in each case the phase conductors of the busbar can be led through the openings located in the side walls and either a bushing conductor, directed along a mid-axis of this opening, can be led through each of the remaining openings to a further live switchgear component, or this opening can be closed off by a cover or a cast wall.

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Oberhasli, Switzerland

Karl Munzinger