Abstract
The electrical strength of transformer oil is the most basic performance indicator, which determines the service life of liquid insulation. In the process of operation of transformer oil, its electrical strength is affected by various impurities. In this regard, in this paper, a review of the influencing impurities on this basic oil performance indicator has been made. The results of purification of waste transformer oils with the purpose of increasing their electrical strength are given. A ceramic membrane filter designed for cleaning spent transformer oil from mechanical impurities was developed for carrying out experimental studies. Purification of waste transformer oils of soluble and moistened impurities is applied by the adsorption method. Silicagel and zeolite are used as adsorbents. Purification of waste transformer oils using a ceramic membrane filter and adsorbents was carried out according to the developed scheme by the author. The final cleaning of each oil sample with a ceramic membrane filter allowed to increase the breakdown voltage up to 60 kV.
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