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The calculating of reached ageing based on the history of loading according   of International Electrotechnical Commission standard algorithm is the first   task. In order to verify the obtained results, measurements of   polymerization index were made on 28 paper samples taken directly from low   voltage terminals (winding ends) and bus connections of the transformer   under test rated 380 MVA, 2´15,75 kV/420 kV. The complete procedure of paper   sample locations and taking off is described, thereby providing a manner of   how this should be done, determined by specific conditions of the   transformer under test. Furthermore, the determination of limit viscosity   and using its relationship function with polymerization index are explained   together. Comparison is made with those of liquid chromatography of oil. The   results of particle sort and size analysis are shown. Finally, an estimation   of the transformer life remainder is made, which is of paramount importance   when defining the steps that have to be made either in revitalization   process or in transformer replacement planning

The oil - paper insulation reliability estimation of 420 kV transformer concerning thermal stresses during exploitation conditions