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Evaluation of rotating machine insulation using SFRA and FDS testing

pubblicazioni - Memoria

Evaluation of rotating machine insulation using SFRA and FDS testing

L’articolo affronta le tematica dell’impiego di possibili nuove tecniche diagnostiche applicate alle macchine rotanti. In particolare nell’articolo si riportano i primi risultati della ricerca volta a valutare come le tecniche di Sweep Frequency Response Analysis (SFRA) e Frequency Dielectric Spectroscopy (FDS) possano evidenziare cambiamenti nel sistema isolante di motori di media tensione.

The article discusses the issue of the use of possible new diagnostic techniques applied rotating machines. In particular the first results of investigations having the purpose to evaluate how Sweep Frequency Response Analysis (SFRA) and Frequency Dielectric Spectroscopy (FDS) can reflect the changes of insulation system of MV induction motors, are discussed in this paper. These methods, together with dissipation factor and partial discharge (PD) measurements, were applied to evaluate complete machines having moisture contamination, internal delaminations, end-winding displacements and other defect typologies. The results are compared with those obtained testing twin machines in good conditions, used as a reference. It is shown that a more complete diagnostic information can be obtained integrating the test results of PD, SFRA and FDS test methods.

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