高压电器2012，Vol.48Issue(3)：40-45,51,7.
电力变压器用绝缘纸热老化微观机理的X射线衍射分析
Aging Micro-mechanism of Oil-paper Insulation in Power Transformers by XRD Analysis
向彬 1廖瑞金 2张勇 3何垒 3周天春2
作者信息
- 1. 重庆市电力公司检修分公司,重庆400039
- 2. 重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044
- 3. 西南电力设计院,成都610021
- 折叠
摘要
Abstract
Temperature plays the main role in oil-paper degradation. In order to study oil-paper aging mechanism, accelerated thermal aging experiments in laboratory were performed. Kraft paper and naphthenic mineral oil were thermally aged for 370 days at 90 ℃. The XRD under different aging conditions of insulation samples were periodically performed, the variation of supramolecular structure of the oil-paper with different aging conditions was investigated, and the kinetics of paper degradation was also discussed in detail. The results indicate that the degree of polymerization (DP) of the oil-paper is caused by breakdown of hydrogen and glycoside bonds, resulting in cellulose's inter-or inner-molecular force weakening and activation energy of pyrolysis decreasing. The crystal areas of cellulose are destroyed, and the crystal grain size decreases, and the crystal type keep stable during paper aging. The decreasing of DP coincides with the second-order kinetic model, and the decreasing law of DP can be well explained by relative degree of crystallinity.关键词
变压器/油纸绝缘/热老化/微观机理Key words
transformer/ oil-paper insulation/ thermal aging/ micro-mechanism分类
信息技术与安全科学引用本文复制引用
向彬,廖瑞金,张勇,何垒,周天春..电力变压器用绝缘纸热老化微观机理的X射线衍射分析[J].高压电器,2012,48(3):40-45,51,7.
