Activating mechanism for an interrupter chamber

Details Activating mechanism for an interrupter chamber Activating mechanism for an interrupter chamber

H - Electricity

01

H

H01H 71/14 (2006.01) H01H 3/30 (2006.01) H01H 75/04 (2006.01) H01H 3/60 (2006.01)

Patent

CA 2141505

This invention concerns a mechanism for actuating the mobile contact of a protective shut-off chamber (1) on a high- or medium-tension electrical power line to be opened at a line over-current threshold, this mechanism comprising an actuator acting on a device (5) that displaces the contact. The actuator is a conductive helical spring (6) made of a shape-memory alloy electrically connected to the line, whose becoming heated when carrying the said threshold over-current is such that the said alloy goes from its martensite phase to its austenite phase and allows the shut-off chamber (1) to close via a sequencing device (8) associated with the contact displacement device (5) and ensuring a controllable and timed cycle of opening and closing.

La présente invention concerne un mécanisme d'actionnement du contact mobile d'une chambre de coupure (1) de protection installée sur une ligne électrique haute ou moyenne tension et devant être ouverte à l'apparition d'un seuil de surintensité sur la ligne, ce mécanisme comportant un organe moteur entraînant un dispositif de déplacement (5) du contact. L'organe moteur est un ressort hélicoïdal (6) conducteur en alliage à mémoire de forme lié électriquement à la ligne et dont l'échauffement, lorsqu'il est traversé par ledit seuil de surintensité, est tel que ledit alliage passe de sa phase martensitique à sa phase austénitique et il permet la refermeture de la chambre de coupure (1) grâce à un dispositif séquenceur (8) associé au dispositif de déplacement (5) et assurant un cycle réglable et temporisé d'ouvertures et de fermetures.

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