Areva T&d Sa

Alstom Technology Limited

Jean-Luc Bourgeois

Christophe Creusot

Joël Ozil

Yannick Kieffel

Christian Lindner

An insulating tube () located between the main contacts () and the arcing contacts () of an interrupting chamber () of a high-voltage or medium-voltage circuit-breaker makes it possible to modify the distribution of the equipotential lines (V) during breaking. Thus, it is possible to reduce the electric field on the contacts, and thus to improve the breaking and the dielectric strength in the open position. The insulating tube () can also serve for transmitting movement between the contacts () for triggering the circuit-breaker.

Interrupting chamber with a field distributor cylinder for high-voltage or medium-voltage circuit breakers

This invention relates to a circuit breaker () for high or medium voltages, of the type having a drive bar () coupled to a drive member, and a circuit-breaking chamber () facing it and having two contacts (), each contact () including a main contact (respectively) and an arcing contact (respectively), with one of the two contacts () being fixed to a blast or extinguishing nozzle (). According to the invention, the second contact () and the drive bar () are joined together by coupling means () in such a way that they move together in translation in the same direction, the transmission means () being disposed on the side () of the chamber () that is adjacent to the drive bar (), and are adapted to transmit the motion of the driven second contact () to the first contact ().

Circuit breaker with a double acting circuit-breaking chamber and an inverted structure

In order to reduce the breaking energy of a high-voltage or medium-voltage circuit-breaker, the interrupting chamber () contains two contacts () mounted to move in opposite directions, actuated via a single device (). The two contacts () are driven in opposite directions by a cylindrical cam () having slots () that co-operate with fixed rods (), each of which is connected to a respective one of the contacts (): the profiles of the slots () make it possible to manage the speed and the amplitude of the movement of the second contact () relative to the main contact () without requiring any complex design.

Actuating the oppositely-moving contacts of an interrupting chamber by a cylindrical cam

In order to reduce the breaking energy of a high-voltage or medium-voltage circuit-breaker, the interrupting chamber () contains two contacts () mounted to move in opposite directions, and actuated via a single device (). The two contacts () are surrounded by an insulating casing () of tubular shape, coupled in fixed manner to the main contact (). The contacts () are actuated by a device having a lever () in which each lever arm is coupled to a link, one of the links () being secured to the insulating casing () and the other link () being secured to the second contact (). The guiding of the drive tube () on the main contacts () makes it possible to improve breaking by keeping clean gas between said main contacts.

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Lyons, France

Jean-Luc Bourgeois