Abstract
In addition to the requirements of environmental protection and sustainable development, improving the overall performance of oil-paper composite insulation and extending the service life of oil-paper insulation equipment have also attracted attention. Mixed insulation oils are considered to be the top choice to meet these requirements without changing the design structure of the transformer. Our group proposed a new 3-element mixed insulation oil whose key parameters can meet the IEC 60296-2012 requirement for mineral oil. This paper presents two of the most important parameters of the 3-element mixed insulation oil, i.e., electrical properties and anti-aging properties. The results show that the electrical properties of the mixed oil is desirable. The relative dielectric constant of the mixed insulation oil is significantly higher than that of mineral oil. The AC breakdown voltage of the mixed insulation oil is also slightly larger than that of mineral oil at different temperature. The accelerating thermal aging experiment results show that the mixed oil has the ability to significantly delay the aging rate of the insulation paper. The lifespan of the mixed oil-impregnated insulation paper is nearly twice that of the mineral oil-impregnated insulation paper, which implies the transformers filled or replaced by the new 3-element mixed insulation oil would have a long lifespan.
Published Version
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