Breakdown Mechanism in Transformer Oil ITO 100


  • J. Kúdelčík
  • L. Varačka
  • S. Poljak


streamer, breakdown, arc channel, temperature


The DC breakdown characteristics of dielectric liquid – transformer oil were measured. The experimental results showed that the breakdown voltage in transformer oil increases with the external pressure. This pressure dependence indicated the involvement of gas phase process during the development of stage of the prebreakdown process. The initial state of breakdown development on the basis of bubble theory was explained. Using the Braginskii-Martin's analytical model parameters of breakdown channel were calcu-lated. Development of vapor channel after breakdown was recorded by high speed camera.


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