Deriving an Equivalent Circuit of Transformer Insulation for Understanding the Dielectric response Measurements

  • Saha, Tapan K.
  • Purkait, Prithwiraj
  • Muller, Frank
Publication date
January 2005
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
ISSN
0885-8977

Abstract

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 parame...

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