Ageing of oil impregnated thermally upgraded papers

  title={Ageing of oil impregnated thermally upgraded papers},
  author={Knut Brede Liland and Marit-helen Glomm Ese and Cecilie Mork Selsbak and Lars E. Lundgaard},
  journal={2011 IEEE International Conference on Dielectric Liquids},
Investigation of the difference in the ageing process for several thermally upgraded and non-upgraded papers in transformer oil was performed. We observed that the level of nitrogen in the papers is crucial for the resistance towards hydrolysis. One of the papers in the experiment did not fulfil the upgrade specification with respect to the nitrogen level (data sheet). For hydrolysis of wet oil impregnated samples in argon atmosphere the upgraded papers seem to degrade less than non-upgraded… CONTINUE READING
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