2005/01/01 by Tapan Kumar Saha, T.K. Saha, P. Purkait +1
Engineering · Materials Science · #High voltage insulation and dielectric phenomena #Magnetic Properties and Applications #Power Transformer Diagnostics and Insulation
paper · doi:10.1109/tpwrd.2004.835436
openalex publication_date 2005/01/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/11
Preventive diagnosis and maintenance of transformers have become more and more popular in recent times in order to improve the reliability of electric power systems. Dielectric testing techniques such as return voltage measurement (RVM) and polarization-depolarization current (PDC) measurement are being investigated as potential tools for condition assessment of transformer insulation. A better understanding and analysis of the dielectric test results are only possible with a clear understanding of the physical behavior of the insulation system in response to moisture and aging. A circuit model, which describes the dielectric behavior of the transformer's main insulation system, has been parameterized in this paper. The values of the parameters of the model have been identified from the dielectric tests. A 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 dielectric test results.