Effect of melamine modified cellulose nanocrystals on the performance of oil-immersed transformer insulation paper
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ORIGINAL RESEARCH
Effect of melamine modified cellulose nanocrystals on the performance of oil-immersed transformer insulation paper QiJie Chen
. MeiCun Kang . QiongHua Xie . JianHui Wang
Received: 10 March 2020 / Accepted: 20 June 2020 Ó Springer Nature B.V. 2020
Abstract It is generally believed that the service life of transformer oil-paper insulation is determined by the aging condition of transformer insulation paper. In order to further improve the anti-aging performance of transformer insulation paper, the cellulose nanocrystals (CNCs) modified by citric acid crosslinking and melamine amidation, were used to prepare the transformer insulation paper. The insulation paper containing modified CNCs was characterized with Fourier Transform Infrared Spectroscopy, X-ray diffractometry and Scanning Electron Microscopy. When the dosage of modified CNCs was 3.0 wt% at the beating
degree of pulp of 35 °SR, compared with the reference insulation paper, the tensile index of insulation paper containing modified CNCs was increased by 17.30%, the AC breakdown strength in air and oil were increased by 12.95% and 40.28%, respectively. And the degree of polymerization of insulation paper containing modified CNCs was 50.50% higher than that of reference insulation paper at the aging time of 28 days. The melamine modified CNCs could improve the thermal aging performance of transformer insulation paper.
Q. Chen (&) M. Kang Q. Xie J. Wang Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan Province, People’s Republic of China e-mail: [email protected] M. Kang e-mail: [email protected] Q. Xie e-mail: [email protected] J. Wang e-mail: [email protected]
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Cellulose
Graphic abstract
pulp suspension
Melamine modified CNCs
Insulation paper sample
Paper forming Excellent performance of the insulation paper Keywords Transformer insulation paper Cellulose nanocrystals Melamine Breakdown strength Degree of polymerization
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Introduction Oil-immersed transformers are one of the most widely used types of transformer in the world (Liao et al. 2013). They are mainly composed of insulating oil and
Cellulose
insulation paper (Tang et al. 2018). Their safe operation life is mainly determined by the degree of insulation aging (Liu et al. 2019), and the transformer oil can be regenerated or replaced in operation, so the aging and life of transformers mainly depends on the insulation paper and its condition (Tang et al. 2010). The special purpose of insulation paper requires it to have some different characteristics, including mechanical properties, electrical properties and thermal stability (Hao et al. 2012; Huang et al. 2017). During the long-term operation of the transformer, the insulation paper is affected by a variety of factors and gradually loses its mechanical and electrical properties due to its aging a
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