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Knowledge of the reliability of power transformers is of growing importance to the asset manager. A method is presented for determining the reliability of a power transformer based on the mechanical strength of winding insulation paper. In addition to the modelling technique, there is a validation method for the modelling technique presented. The validation method depends on a good data management...
The ageing of power systems and their components are of great concern for the asset manager, especially in view of the coming replacement wave in the electrical infrastructure. The asset manager is in need for a prediction tool, to determine the long term effects on the statistical relevant parameters of a population of power systems components. In this paper we describe a method for forecasting the...
A combination of diagnostic techniques was carried out for a 232 MVA hydro-generator stator. These techniques included quality assessment of the electrical contact between semi-conductive (S/C) coating of stator bars and the magnetic iron core, partial discharge (PD) measurements, polarization and depolarization currents and finally stator bar dissection. The analytic hierarchy process (AHP), a multi-criteria...
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