Natural esters have the capability to enhance the life expectancy of the insulating cellulose paper used in oil-filled transformers. This work presents the aging behavior of an insulating paper when it is combined with a new natural ester (based on soybean oil) and compared with an industry-proven system according to the latest version of the standard IEEE Std. C57.100 (2011). The temperatures for the candidate system (natural ester + cellulose paper) are 160, 175, and 190 °C. Experimental results show that the average mechanical tensile retention from the industry-proven system aging system is 44.2%, which is used as reference to evaluate the candidate system. According to this investigation, the insulation system with the new natural ester liquid shows an improvement in the behavior of the aging performance compared to the mineral oil system. The Arrhenius life plots demonstrate that the system of natural ester-thermally upgraded Kraft paper shows a life expectancy higher than for the industry-proven system. Therefore, this alternative could be considered either to increase the lifetime of a transformer or to improve its overload capacity during operation.

中文翻译：

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纤维素绝缘材料在天然酯液体中的热老化性能


天然酯能够提高油浸变压器中使用的绝缘纤维素纸的预期寿命。这项工作展示了绝缘纸与新型天然酯（基于大豆油）结合时的老化行为，并根据最新版本的 IEEE 标准与经过行业验证的系统进行比较。 C57.100（2011）。候选系统（天然酯+纤维素纸）的温度为160、175和190°C。实验结果表明，经过行业验证的系统老化系统的平均机械拉伸保留率为44.2%，可作为评估候选系统的参考。根据这项调查，与矿物油系统相比，采用新型天然酯液体的绝缘系统显示出老化性能的改善。阿伦尼乌斯寿命图表明，天然酯热升级牛皮纸系统的预期寿命高于经过行业验证的系统。因此，可以考虑采用这种替代方案来延长变压器的使用寿命或提高其运行期间的过载能力。