Prithwiraj Purkait

TL;DR: In this article, the polarization and depolarization current (PDC) analysis is used for determining the conductivity and moisture content of insulation materials in a transformer, which is a non-destructive dielectric testing method.

TL;DR: In this article, a circuit model, which describes the dielectric behavior of the transformer's main insulation system, has been parameterized in order to identify the values of the parameters of the model and the correlation has been developed between the physical condition of the insulation and the equivalent model parameters that enable a clear and transparent interpretation of the test results.

TL;DR: In this paper, the effects of temperature on the dielectric measurements of a transformer under controlled laboratory conditions are investigated, and the results of practical on-site testing are also presented to demonstrate the possibility of errors that may be introduced in dielectrics test results analysis unless temperature effects are taken into consideration.

TL;DR: In this article, a series of experiments have been performed under controlled laboratory conditions with preset moisture content, and at controlled high temperature ageing, and the results were analyzed with the view of separately understanding the impacts of thermal ageing and moisture on the condition of oil and paper insulation in a transformer.

TL;DR: In this article, an expert system (ES) is developed, which imitates the performance of a human expert, to make the complicated insulation condition assessment procedure accessible to plant maintenance engineers.