Method for monitoring of tap changers by acoustic analysis

G - Physics – 01 – R

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G01R 31/02 (2006.01) G01R 31/327 (2006.01) G05F 1/14 (2006.01)

Patent

CA 2248760

A method for monitoring an on-load tap changer wherein the recording of sound and its conversion into a sound signal are initiated at the beginning of a connection operation of the tap changer and the sound signal is rectified, converted into a signal envelope, sampled digitally and continuously evaluated with respect to the condition of the tap changer by comparing the envelope with at least one fixed or one continuously updated reference envelope. The comparison is carried out selectively by calculating a dimensionless comparison figure Ti which is based on a quantity measure and a variation measure.

La présente invention concerne un procédé de gestion d'un commutateur à prises de réglage dans lequel l'enregistrement des sons et leur conversion en un signal sonore démarre au début de l'opération de connexion du commutateur à prises de réglage et dans lequel le signal sonore est rectifié, converti en enveloppe de signal échantillonné numériquement et constamment mesuré par rapport à l'état du commutateur par comparaison de l'enveloppe avec une enveloppe de référence et/ou une enveloppe constamment actualisée par rapport à ladite enveloppe de référence. La comparaison s'effectue sélectivement en calculant une valeur de comparaison indéterminée T¿i? qui est basée sur une mesure de quantité et une mesure de variation.

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