植物油对油浸绝缘纸老化速率的影响及机理

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Abstract With the development of new insulation materials, vegetable oil—the best substitute for mineral oil—has gradually been widely used in the liquid insulation of transformers. To investigate the influence of vegetable oil on the thermal aging rate of cellulose paper, kraft paper impregnated with mineral oil and vegetable oil underwent thermally accelerated aging at three different temperatures. degree polymerization(DP)of Kraft paper was measured to indicate the aging degree of insulation paper. The aging rate of paper in mineral oil and vegetable oil was compared quantitatively, and results showed that vegetable oil retarded paper’s degradation rate and extended its useful lifetime. The reasons contributing to such phenomenon were analyzed using X-ray Photoelectron Spectroscopy(XPS)and molecular simulation software. Kraft paper in vegetable oil had larger activation energy. Due to the larger interaction force between water and natural ester molecules, water molecule was easily bonded with natural ester, weakening the hydrolysis process of cellulose. Cellulose was chemically modified by natural ester during thermal aging process, and the reactive-OH(hydroxyl) groups on the cellulose became esterified with fatty acid esters. The water molecule was firmly bounded to the ester groups on glucose produced by esterification. The long-chain fatty acid esterified to cellulose was parallel with cellulose chains and acted as a “water barrier” to further weaken the hydrolysis process.

Key words： Oil-paper accelerated thermal aging degree polymerization X-ray photoelectron spectroscopy(XPS) molecular simulation

Received: 02 March 2010 Published: 20 March 2014

PACS:

TM835

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	Articles by authors
	Yang Lijun
	Liao Ruijin
	Sun Caixin
	Yin Jianguo
	Zhu Mengzhao

Cite this article:

Yang Lijun,Liao Ruijin,Sun Caixin等. Influence of Vegetable Oil on the Thermal Aging Rate of Kraft Paper and Its Mechanism[J]. Transactions of China Electrotechnical Society, 2012, 27(5): 26-33.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2012/V27/I5/26

[1] Mcshane C P. Letter to the editor[J]. IEEE Electrical Insulation Magazine, 2002, 18(3): 6-7.
[2] Oommen T V. Vegetable oils for liquid-filled transformers[J]. IEEE Electrical Insulation Magazine, 2002, 18(1): 6-11.
[3] ANSI/IEEE Std C57.92—1981. IEEE guide for loading mineral-oil-immersed power transformers up to and including 100 MVA with 55℃ or 65℃ average winding rise[S]. 1981.
[4] 廖瑞金, 梁帅伟, 周天春, 等. 天然酯-纸绝缘热老化速度减缓及其原因分析[J]. 电工技术学报, 2008, 23(9): 32-37, 44.
[5] 杨丽君, 廖瑞金, 孙会刚, 等. 变压器油纸绝缘热老化特性及特征量研究[J]. 电工技术学报, 2009, 24(8): 27-33.
Yang Lijun, Liao Ruijin, Sun Huigang, et al. Investigation on properties and characteristics of oil-paper insulation in transformer during thermal degradation process[J]. Transactions of China Electrotechnical Society, 2009, 24 (8): 27-33.
[6] 李晓虎, 李剑, 杜林. 一种转基因菜籽绝缘油的电气性能[J]. 中国电机工程学报, 2006, 26(15): 95-99．
Li Xiaohu, Li Jian, Du Lin, et al．The electric properties of a transgenic vegetable oil[J]. Proceedings of the CSEE, 2006, 26(15):95-99．
[7] 廖瑞金, 冯运, 杨丽君. 油纸绝缘老化特征产物生成速率研究[J]. 中国电机工程学报, 2008, 28(10): 142-147.
[8] 杨丽君, 廖瑞金, 孙会刚, 等. 油纸绝缘热老化特性及生成物的对比分析[J]. 中国电机工程学报, 2008, 28(22): 53-58.
[9] ASTM D 4243—99 (Reapproved 2004). Standard test
method for measurement of average viscometric degree of polymerization of new and aged electrical papers and boards[S], 2004.
[10] Heywood R J, Stevens G C, Ferguson C, et al. Life assessment of cable paper using slow thermal ramp methods[J]. Thermochimica Acta, 1999, 332(2): 189-195.
[11] Paolo Calvini. The Influence of levelling-off degree of polymerisation on the kinetics of cellulose degradation[J]. Cellulose, 2005, 12(4): 445-447.
[12] Kenneth T Gillen, Mat Celina. The wear-out approach for predicting the remaining lifetime of materials[J]. Polymer Degradation and Stability, 2000, 71(1): 15-30.
[13] Alwis K, Burgoyne C. Time-temperature superposition to determine the stress-rupture of aramid fibres[J]. Applied Composite Materials, 2006, 13(4): 249-264.
[14] Emsley A M, Stevens G C. Review of chemical indicators of degradation of cellulosic electrical paper insulation in oil-filled transformers[J]. IEE Proceedings of Science, Measurement and Technology, 1994, 141(5): 324-334.
[15] CIGRE TF D1.01.10. Aging of cellulose in mineral- oil insulated transformers[R]. Brochure No. 323. Paris, 2007.
[16] Xia Shaowu. Activation energy and its calculation[M]. Beijing: China Higher Education Press, 1993.
[17] Belgacem M N, Czeremuszkin G, Sapieha S, et al. Surface characterization of cellulose fibres by XPS and inverse gas chromatography[J]. Cellulose, 1995, 2(3): 145-157.
[18] Wang Pinglang, Y Tao Bernard. Synthesis and characterization of long-chain fatty acid cellulose ester (FACE)[J]. Journal of Applied Polymer Science, 1994, 52(6): 755-761.
[19] Liu Fenglin, Xu Wei. Characteristic comparison between paraffine-base and naphthene-base transformer oils[J]. Transformer, 2004, 41(7): 27-29.