Power Transformer Diagnosis based on Mechanical Oscillations due to AC and DC Currents. IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION, (23)3, SI:1515-1522, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA, June 2016. [PUMA: noise; transformers; transmission {Power measurement; lines} hysteresis; monitoring; magnetic HVDC vibration magnetostriction;]