Abstract
In this report, water absorption behaviors of four kinds of transformer oils composed of Gas-To-Liquid (GTL) and conventional mineral base oils were studied under three different temperature and humidity combinations simulating typical actual storage and transportation conditions of transformer oil. By comparing the test results it is found that the water content of the GTL transformer oil increased to 30mg/kg in a shorter period than the other three conventional mineral oils. Through the diffusion theory analysis, it is concluded that this is mainly because that GTL transformer oil is of relatively lower polarity and it is more difficult to form association structure with water molecules, and therefore water is more rapidly spread in the GTL transformer oil.
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