Asea Brown Boveri Ag

J&ouml;rg Peter

Lukas Zehnder

Olaf Hunger

Thomas Schoenemann

Markus Keller

Ion Gavrilita

Christian D&auml;hler

Monika Abrell

A switching arrangement having a large burn-up reserve, contact fingers (,) are connected to a first electrical terminal via flexible bands (,) consisting of strips of, for example, copper which lie one above the other. The connecting portion (,) of the band (,), the said connecting portion adjoining the contact fingers (,) and being rigidly connected to them, is reinforced in each case by pressure welding of the strips. In the switch-off state, the bands (,) and, in part, the contact fingers (,) bear on an outwardly pointing supporting face (,), whilst, in the switch-on state, at least the contact fingers (,) and connecting portions (,) are lifted off from the supporting face (,), with the bands (,) being bent at the same time, as a result of contact with the outside of a switching pin (,) displaceable along a switching axis (,). The pressure force caused by electromagnetic attraction between the relatively short contact fingers (,) and the connecting portions (,), which in each case form an angle of approximately 30&deg; with the switching axis (,), approximately compensates the contact lift-off forces, whilst the forces acting on the flexible parts of the bands (,) are absorbed essentially by the supporting face (,).

Burn-off contact arrangement

An automatically resetting safety valve for a generator circuit breaker is to open rapidly and wide, even if the pressure applied to a valve-closing body (,) does not increase substantially over a valve stroke (a) or even falls. In order to ensure this, a valve-closing-body joint (,) of the valve-closing body (,) via a first closing-body lever (H,) and via a first sliding joint (,), is connected in an articulated manner to a first support lever (H,), which is rotatably mounted in a first support lever joint (,) fastened to a lever wall (,). The first sliding joint (,), via a first compression spring (,), is in compressive connection with a spring wall joint (,) fastened to a spring wall (,). The valve-closing body (,) is movable along a plain-bearing axis (A). First and second closing-body levers (H,, H,&prime;) and first and second support levers (H,, H,&prime;), which are arranged in mirror image relative to the plain-bearing axis (A) of the valve-closing body (,), may be provided. Instead of an outer compression spring (,), an inner tension spring (,) may be provided.

Spring-loaded safety valve

Growing community of inventors

Hinwil, Switzerland

Jörg Peter

Growing community of inventors

Hinwil, Switzerland

J&ouml;rg Peter

Jörg Peter