Electrical contact wear and temperature indicator

H - Electricity – 01 – H

Patent

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Details

H01H 1/00 (2006.01)

Patent

CA 2265816

The design of electrical switches that operate under load (with current flowing) requires replacement of the electrical contact after erosion and wear experienced by arcing and raised temperatures reduce functionality below acceptable limits. A quantity of trace element or compound (18) is implanted at a depth representative of the point at which wear or erosion requires contact replacement. When exposed by wear or erosion, the quantity of the trace element (18) is released into the oil or other medium surrounding the contact, providing an indication of excessive wear. Alternatively or in addition, a quantity of indicator material is released from the surface of one or more switch components into the surrounding medium once a preselected temperature has been reached.

La conception des commutateurs électriques fonctionnant sous charge (soumis au passage d'un courant) nécessite le remplacement du contact électrique lorsque ses fonctionnalités baissent au-dessous d'une limite acceptable en raison de l'érosion et de l'usure dues à la formation d'étincelles et à des températures élevées. On introduit une certaine quantité d'un élément ou d'une substance trace (18) à une profondeur qui reflète le degré d'érosion ou d'usure nécessitant le remplacement du contact. Sous l'effet de l'érosion ou de l'usure, ladite quantité de l'élément trace (18) est relâchée dans l'huile ou dans un autre média entourant le contact, indiquant ainsi que l'usure est devenue excessive. En option ou en guise de complément, une quantité d'un élément trace se trouvant à la surface d'un ou de plusieurs composants du commutateur électrique peut se libérer dans le média environnant une fois qu'une température présélectionnée est atteinte.

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