Review of modern diagnostic techniques for assessing insulation condition in aged transformers

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50 years in the development of insulating liquids (2013, methodology): “Diagnostic techniques, based on dielectric spectroscopy, for assessing the condition of the insulation in aged transformers are reviewed in [108].”
Cellulose insulation in oil-filled power transformers: part II maintaining insulation integrity and life (2006, background): “22, No. 2 9 oped from field sample testing to relate furanic content to DP [10] – [ 14 ].”
Dielectric spectroscopic measurements on transformer oil-paper insulation under controlled laboratory conditions (2008, positive): “The measurement of polarization and depolarization currents (PDC) following a dc voltage step is one way in the time domain to investigate the slow polarization processes [4, 613].”
Oil-paper aging evaluation by fuzzy clustering and factor analysis to statistical parameters of partial discharges (2010, methodology): “Review publication [10] points out that no single method can be considered as the best diagnostic method.”
Dynamic thermal modelling of power transformers (2004, background): “Hydrocarbons are produced as the result of oil degradation caused by overheating, partial discharges and arcing at higher temperature values than carbons, [63].”