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Absmet:The application of advanced off-line methods and procedures for condition assessment of new and semce-aged power transformers are discussed. The selection of the diagnostic methods is based on the main operational Stresses (electrical, mechanical, thermal) and on typical failure modes:(1) detection of polar components in the papedoil insulating system using frequency domain spectroscopy (FDS) or using measurements of polarisationldepolnriisation currents (PDC) in the time domain, (2) localization of inhomogenities in the insulating system using sensitive partial discharge detection (PD) and (3) detection of deformations and movement of windings in the active pari using measurement of the transfer function @RA).