A Short Review of Some of the Factors Affecting the Breakdown Strength of Insulating Oil for Power Transformers

  • M. Danikas Department of Electrical & Computer Engineering, Democritus University of Thrace, Greece
  • R. Sarathi Indian Institute of Technology Madras, Department of Electrical Engineering, Chennai, India
  • S. Morsalin University of New South Wales, School of Electrical Engineering and Telecommunications, Sydney, Australia
Keywords: transformer oil, breakdown strength, conditioning effect, velocity effect, oil flow, voltage waveform, voltage duration, size effect, electrode surface protrusions, surface irregularities, electric field geometry, electrode configuration

Abstract

The present short review investigates some of the factors affecting the breakdown strength of transformer oil. Factors such as the conditioning effect, effect of oil flow, influence of impurities, type of applied voltage and electrode configuration and geometry are further discussed. It should be noted that this review does not discuss the effect of factors such as area, volume and capacitance. Velocity, impurities, electrodes’ shape and the type of applied voltage are among the factors documented to have a significant effect on breakdown strength.

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