This article deals with the application of synthetic ester for drying cellulose insulation of distribution transformers. The most important advantages and disadvantages of the commonly used methods of drying transformer insulation on site are discussed. The emphasis is placed on the analysis and research of the most important factors affecting the drying efficiency of cellulose insulation using a synthetic ester, such as: insulation temperature, water content in ester, weight ratio of cellulose materials to ester, thickness of pressboard, and water content in solid insulation. The choice of values range of the individual factors which are used during tests on drying efficiency in laboratory conditions are justified. It is found on the basis of the obtained test results that to ensure the satisfactory drying effect an average insulation temperature should be at least of 70°C and the water content in the ester should not exceed 150 ppm. The results give the opportunity to estimate the drying efficiency depending on the conditions of the process. Moreover, the results are used to develop the procedure of drying of distribution transformers by means of synthetic ester.

中文翻译：

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合成酯干燥纤维素材料效果影响因素分析


本文讨论了合成酯在干燥配电变压器纤维素绝缘中的应用。讨论了现场干燥变压器绝缘的常用方法的最重要的优点和缺点。重点对影响合成酯纤维素绝热干燥效率的最重要因素进行分析和研究，如：绝热温度、酯中的含水量、纤维素材料与酯的重量比、纸板的厚度、固体绝缘中的含水量。在实验室条件下干燥效率测试期间使用的各个因素的值范围的选择是合理的。根据所得测试结果发现，为保证满意的干燥效果，平均保温温度应至少为70℃，酯中的水含量不应超过150 ppm。结果使我们有机会根据过程条件估计干燥效率。此外，研究结果还用于开发利用合成酯干燥配电变压器的程序。