Method for monitoring contact consumption in multiple...

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Details

G01R 31/333 (2006.01) G01R 31/327 (2006.01) H01H 1/00 (2006.01) H01H 9/00 (2006.01)

Patent

CA 2545827

The invention relates to a method for monitoring contact consumption in multiple contact switches of the load-switching type, wherein the selection and the switching is carried out in one step by the movement of switching contacts and which therefore do not have a separate diverter switch. Every time the multiple contact switch is actuated, the load current is measured. The corresponding, previously stored rated stage voltages for the current switching and information on whether it was shifted "up" or "down", are used to calculate the switching currents of the breaking contacts, the consumption rates are determined on the basis thereof and the volume consumption is accumulated. Said accumulated value is compared with a previously determined threshold value; once this threshold value is reached, warning messages or other messages are generated.

L'invention concerne un procédé de surveillance de l'usure des contacts de commutateurs à gradins, du type sélecteurs de charges, dont les fonctions de sélection et de commutation sont effectuées en une étape par le déplacement des contacts commutateurs et qui ne présentent donc pas de commutateur de réglage en charge distinct. Ce procédé consiste à mesurer le courant opérationnel pour chaque actionnement du commutateur à gradins ; à calculer les courants commutateurs respectifs des contacts de coupure à l'aide de la tension en échelon nominale correspondante, préalablement accumulée pour la commutation en cours, et des informations indiquant si la commutation a eu lieu vers le <= haut >= ou vers le <= bas>=; on en déduit les vitesses d'érosion puis on cumule l'érosion volumique respective. Cette valeur cumulée est comparée à une valeur limite déterminée préalablement. Lorsque cette valeur limite est atteinte, des avertissements ou autres messages sont générés.

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