This paper deals with new procedures based on
vibro-acoustic techniques to diagnose power medium-voltage/lowvoltage
(MV/LV) transformers. The normal operating machines
can be monitored and checked from a remote, dedicated diagnostic
center where information is received directly from the field. The
diagnostic method adopted and the experimental test results are
reported. Tests have been performed either in the laboratory or
directly in the field on transformers in normal operating conditions.
The laboratory tests related the transformer vibrations
to internal anomalies. The suggested monitoring and diagnostic
system allows one to usefully schedule preventative maintenance,
reduce costs, and improve the quality of power distribution.