Dielectric response change of pressboard immersed with mineral oil after replacing insulating liquid with synthetic ester

[摘要] The manufacturer of synthetic ester claims that replacing mineral oil with his product does not affect the work of the unit. Despite assurances, this information should be treated cautiously. Insulating liquid replacement, i.e. substitution of oil with ester, and especially intermediate stages of this process can cause problems while evaluating solid insulation moisture of the transformer done by means of the most commonly applied FDS indirect method. The article presents results of model investigations of the dielectric response of pressboard samples immersed with mineral oil, which was replaced with synthetic ester afterwards.

[发布机构] Poznan University of Technology, Institute of Electric Power Engineering, Poland^1

[关键词] Dielectric response;Indirect methods;Insulating liquids;Intermediate stage;Solid insulation;Synthetic esters