A Comparison of the Impregnation of Cellulose Insulation by Ester and Mineral oil
A Comparison of the Impregnation of Cellulose Insulation by Ester and Mineral oil
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DOI：
10.1109/tdei.2008.4483455
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发表时间：
2008-04
影响因子：
3.1
通讯作者：
J. Dai;Z. Wang
中科院分区：
文献类型：
--
作者：
J. Dai;Z. Wang
多年来，酯油已成功地作为矿物油的理想替代品应用于配电变压器。然而，在高压变压器中，它们的应用速度要慢得多，部分原因是酯油的高粘度，因此在纤维素绝缘有效浸渍方面存在不确定性。本文对酯类油浸渍纤维素绝缘材料的特性进行了评价，并与矿物油进行了比较。对高压变压器中典型的支承绝缘结构--厚层压纸板进行了研究。考察了不同温度下油浸渍程度随时间的变化规律。结果表明，控制酯油和矿物油浸渍过程的因素非常相似，即主要是粘度和表面张力，如果对酯油采用较高的浸渍温度，则可以获得与矿物油相同程度的浸油。
Ester oils have been successfully used in distribution transformers for many years as satisfactory substitutes for mineral oil. In high voltage transformers however their application has been much slower partly due to the fact that the high viscosity of ester oil and hence uncertainties in efficient impregnation of cellulose insulation. In this paper the characteristics of the impregnation of cellulose insulation by ester oils are assessed and compared with mineral oil. Studies are carried out on thick laminated pressboard blocks, typical of support insulation structures in high voltage transformers. The degree of oil impregnation with time at various temperatures is examined. It is shown that the factors governing the impregnation processes with ester and mineral oils are very similar, i.e. mainly viscosities and surface tensions, and if a higher impregnation temperature is used for ester oils the same degree of oil impregnation can be achieved as with mineral oils.