摘要
为研究纤维素老化对油纸绝缘水分平衡的影响,分析了绝缘纸板的纤维素结构及其吸湿机制,制备了不同老化程度的纸板试样,观测了不同老化程度绝缘纸板的微观结构及比表面积,测量了纸板的稳态含水量及降温过程中的水分迁移量。研究结果表明:老化纸板的稳态含水量及变温过程中的水分迁移量均低于未老化纸板;纤维素老化后,纤维素直径下降导致的纤维比表面下降是引起纸板吸湿能力下降的原因;现有的Oommen水分平衡曲线在纸板老化的条件下不再适用,纸板的含水量可按20年等效老化负向修正27%,40年等效老化负向修正35.5%后使用。
To research the impact of cellulose aging on moisture equilibrium of oil-pressboard insulation, cellulose structure and its moisture absorption mechanism were analyzed, various aged pressboard samples were prepared, cellulose micro structure and specific surface area of various aged pressboards were observed, and stable moisture and moisture mobility in temperature decreasing process of various aged pressboards were measured. The results show that stable moisture and moisture mobility in temperature decreasing process of aged pressboard is lower than un-aged pressboard; aged pressboards have lower moisture absorption capacity, which is related to the decreasing of cellulose diameter and specific surface area; Oommen＇s moisture equilibrium curves are not fit for aged pressboards, 27% moisture decreasing correction for 20 years equivalent old pressboard and 35.5% moisture decreasing correction for 40 years equivalent old pressboard are necessary.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2012年第31期100-105,224,共6页
Proceedings of the CSEE
基金
国家重点基础研究发展计划项目(973项目)(2009CB724508)~~
关键词
老化
水分平衡
变压器油
纸板
纤维素
aging
moisture equilibrium
transformer oil
pressboards
cellulose
