期刊名称：International Journal on Electrical Engineering and Informatics
印刷版ISSN：2085-6830
出版年度：2019
卷号：11
期号：2
页码：408-426
DOI：10.15676/ijeei.2019.11.2.12
出版社：School of Electrical Engineering and Informatics
摘要：Mineral oil has been widely used as liquid insulation for high voltage equipment suchas a transformer. Due to environmental consideration and long-term availability, there are manyefforts to find new liquid insulating materials that are environmentally friendly and renewable.Natural ester is among the candidates for those purposes. In order to be applicable, its interactionwith the kraft paper as well as its degradation characteristics is essential to be studied.Accelerated thermal aging is a method that typically been used to assess the performance of oiland paper in the laboratory. In this paper, the result of the degree of polymerization (DP), tensilestrength (TS), and Fourier transform infrared spectroscopy (FTIR) measurement were done toexamine the degradation characteristic of kraft paper. FTIR which expected to be a new nondestructivediagnosis method of transformer insulation is used to determine the changes of thechemical bond of the kraft paper. The results show that moisture content affects the decrease ofDP and TS characteristics. Hence, the FTIR measurement of kraft paper shows that theabsorption intensity of C=O and C-H bond increase during the aging.Meanwhile, the absorbance intensity of the O-H bond decreases during aging time. Throughregression method, it can be shown that the correlation between DP values to the peakabsorbance is influenced by oil-paper moisture equilibrium. Exponential regression method isappropriate for high moisture condition and linear regression is suitable for low moisturecondition.
