Bbc Brown, Boveri & Company, Limited

Riccardo Berta

Blaise Perrenoud

An electric high-voltage circuit breaker is provided with two coaxially arranged contact members, which are movable relative to each other, with one rated-current contact (5, 7) and one burning contact (5, 7) each. The rated-current contact (7) and burning contact (7) of one movable one of the two contact members are frictionally joined to each other via a support part. The end, turned away from a stationary one of the two contact members, of the rated-current contact of the movable contact member is in contact, in a sliding manner, with a current supply of this contact member. This breaker is to be further developed in such a manner that the use of an additional sliding contact between the burning contact and the current supply can be omitted even when switching extremely large currents. This is achieved by the fact that the rated-current contact of the movable contact member is formed by contact fingers which are elastically supported on the support part (18) and that the support part is constructed to be electrically conductive and has a contact surface which acts in conjunction with the contact surfaces of the contact fingers after separation of the rated-current contacts. Such a breaker is preferably used as a generator switch.

High-voltage circuit breaker

A contact arrangement for an isolating switch used as a ground connection of a switch system includes two switch pieces which are movable relative to one another, one of which is a knife and the other is a gripper. The gripper includes two contact pieces which are located opposite and parallel to one another and which engage the knife in the cutting-in state. Each contact piece is in turn formed by a plurality of adjacent contact elements. Such a contact arrangement is simple and economical to produce, while providing reliable contact-making for both high and low currents in spite of only slight static contact pressure. This result is achieved because the contact elements are U-shaped contact lamellae. Each lamella includes first and second legs connected via a curved part, the first leg being supported on the knife in the cutting-in state and the second leg being supported on current terminals formed on the contact pieces.

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Neuenhof, Switzerland

Riccardo Berta