Device and method for monitoring and/or analyzing rotors of...

H - Electricity – 02 – P

Patent

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H02P 9/02 (2006.01) H02P 29/00 (2006.01)

Patent

CA 2739844

A method is used for monitoring and/or analysis of electrical machines during operation, wherein an electrical machine has at least one generator with a shaft, an exciter system and drive means for driving this shaft. In this case, a first signal, which describes a voltage across a rotor winding, and a second signal, which describes a current flowing through the rotor winding, are measured simultaneously. The two signals are supplied to an analysis unit. The signals are split into individual frequency components in the analysis unit. The impedance of the rotor winding is then determined in order to identify fault states in the electrical machine.

L'invention concerne un procédé de surveillance et/ou d'analyse de machines électriques en fonctionnement, une machine électrique comportant au moins un générateur doté d'un arbre, un système d'excitation et des moyens d'entraînement pour entraîner cet arbre. Selon l'invention, un premier signal décrivant une tension de l'enroulement de rotor et un deuxième signal décrivant un courant traversant l'enroulement de rotor sont mesurés simultanément. Les deux signaux sont envoyés à une unité d'analyse dans laquelle les signaux sont subdivisés en composants de fréquence individuels. Ensuite, l'impédance de l'enroulement de rotor est déterminée pour détecter des états de dysfonctionnement dans la machine électrique.

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