Alstom Technology Limited

Areva T&d Sa

General Electric Technology Gmbh

Areva T & D Sas

Alstom Grid Sas

Denis Frigiere

Jean-Marc Willieme

Didier Rodrigues

Frank Jacquier

Jean Marc Willieme

Xavier Allaire

Francois Biquez

Vincent Royot

Nicolas Chevillot

Yves Astic

François Biquez

A current-interrupter device () comprising a circuit breaker () including a first stationary conductive support () carrying both a stationary arcing contact () and a movable arcing contact (), and also carrying a movable permanent contact (), the movable arcing contact () and the movable permanent contact () being electrically connected to the first stationary support (), and a disconnector () including a second stationary conductive support () carrying a disconnector contact (), and wherein:

Electrical tripout device integrating a circuit breaker and an isolator

A high- or medium-voltage circuit breaker, in which a movable contact () is moved in sliding in order to separate stationary contacts () from its sliding surface (). In accordance with the invention, the stationary contacts () have switching portions () that separate from the movable contact more or less simultaneously as a result of a setback () in the movable contact (), thereby causing two simultaneous switching arcs to appear (), which arcs are extinguished much more quickly than a single arc, before the current is transferred to the conventional arcing contacts (). This disposition enables the stationary contacts () and their environment to be less exposed to damage.

Medium- or high-voltage circuit breaker or isolator, provided with improved fixed contacts, and method of use

An electrical contact device of the contact finger type for high nominal current between a first part that is conductive and a conductive surface of a second part comprising a flexible rod connected to a first connection element for mechanical and electrical connection to the first part, a contact portion applied on the conductive surface of the second part, and at least one metal contact blade placed at a first end between a first end of the flexible rod and the first part. The flexible rod is conductive, and the at least one metal blade is connected at its second end to the second end of the flexible rod by a second mechanical and electrical connection element.

Electrical contact device of the contact finger type with a strong nominal current

A protection device for providing protection against the particles generated by an electric arc when a first electrically conductive part and a second electrically conductive part of an electrical connection unit are separated from each other, the protection device including at least one protection element disposed in the proximity of the place at which the first part and the second part separate in order to form a shield against the particles.

Device for protection against particles generated by an electric switching arc

The method of the invention makes it possible to cool electrical switchgear operating at medium voltage and high current, such as a circuit breaker. The method consists in inserting serially two heat pipes () inside said switchgear, putting a first end (A) of the first heat pipe () in the hot portion of the hot portions (A,C) of the circuit breaker () and a second end (B) of the first heat pipe () in a portion that is cooler (A) of the hot portions (A,C). The other heat pipe () is put between the cooler of the hot portions (A) and a cooler part of the circuit breaker (). A particular application is provided for medium-voltage, high-current circuit breakers.

Cooling method for cooling medium-voltage electrical switchgear using integrated heat pipes, and a system using said method

A device including a phase-change heat-transfer fluid cooling mechanism to cool a sheath in which is placed switchgear such as a circuit breaker. An evaporator is thus created which is connected to condensers that are placed on a roof of the sheath. The device can be for application to a medium-voltage high-current electrical installation. The device requires little maintenance and only consumes a reduced amount of energy, or even no energy.

Cooling method and device for cooling a medium-voltage electrical installation in a protective sheath

An alternator disconnector circuit-breaker of the invention presents a resistance () in series with the circuit-breaker switch (); the resistance () is of fixed ohmic value that is about 10times greater than the value of the resistance of the main circuit of the circuit-breaker. By means of this configuration, it is possible to use a vacuum chamber as the circuit-breaker switch (), and to dimension the main switch (), which, de facto, breaks the current even for very high short-circuit currents, under more advantageous conditions.

Alternator circuit-breaker with an inserted resistance

An alternator disconnector circuit-breaker of the invention presents a compact structure. The axes of opening/closure of the change-over first switch (), of the circuit-breaker second switch (), and of the disconnector switch () are such that an angle of 90&#xb0; is present between two of them. Actuator means () associated with synchronization means () make it possible to ensure that each switch is operated in a time-shifted manner by common control means.

Compact disconnector circuit-breaker for an alternator

An alternator disconnector circuit-breaker of the invention includes a cylindrical cam () for optimizing the sequence for opening/closing the switch-over first switch (), the circuit-breaker second switch (), and the disconnector third switch (). The cam () has a cylindrical wall in which three slots (), and preferably three pairs of slots, of different shapes, are defined; an end element of an element driving a respective one of the switch contacts is mounted to slide in each slot.

Actuation by cylindrical CAM of a circuit-breaker for an alternator

A first switch () has a first pair of contacts () that are mounted to move relative to each other in translation. A circuit-breaker second switch () has a second pair of contacts () that are mounted to move relative to each other in translation, the second switch () being put in parallel with the first switch (). A disconnector third switch () has a third pair of contacts () that are mounted to move relative to each other. Synchronization means (') make it possible, while breaking is taking place, for the contacts of the first switch () to separate before the contacts of the second switch () separate, the contacts of the second switch themselves separating before the third contacts () separate fully. The synchronization means are actuated by a servomotor ().

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Decines, France

Denis Frigiere