摘要
为研究新型绝缘油天然酯与两种绝缘纸组成的酯-纸绝缘热老化特性,将天然酯-普通纸和天然酯-热稳定纸绝缘试品,在90℃、110℃和130℃下进行了399d的热老化试验。结果表明:天然酯-纸绝缘中,相同老化条件下,热稳定纸聚合度和稳定聚合度都分别明显高于普通纸;通过热稳定纸中含有双氰胺的红外光谱分析,从官能团角度研究了热稳定纸抑制绝缘老化的两大机制。热稳定纸能吸附较多糠醛;对同一种酯-纸绝缘,糠醛仍可作为衡量变压器中酯-纸绝缘老化程度的参量;对不同绝缘纸的酯-纸绝缘,糠醛含量的差异不能表征它们之间绝缘纸老化程度的差异。研究了这两种不同酯-纸绝缘老化过程中,酯中微水含量变化规律的异同,从而建议使用天然酯的变压器,用热稳定纸作为与之匹配的固体绝缘材料,以利于酯在老化过程中保持较好绝缘性能。
In order to compare the properties of natural ester impregnated Kraft paper and thermally upgraded paper, sealed aging vessels containing copper, insulation paper （Kraft paper ano thermally upgraded paper）, and natural ester were aged at 90℃, 110℃, and 130℃ 399 days. The results show that both degree of polymerization（DP） and leveling-off degree of polymerization （LODP） for thermally upgraded paper were higher than the ones of Kraft paper at the same aging condition. The infrared spectrum evidence was given that there was dicyandiamide in thermally upgraded paper, and the aging resistance mechanisms of thermally upgraded paper were analyzed. Furfural can be absorbed by thermally upgraded paper and can be used to monitor the aging condition of a certain natural ester impregnated paper insulation. However, furfural can not be used to compare the aging condition of different types of paper immersed in natural ester. The different disciplinarians of the water content in natural ester were analyzed and the suggestion is given that the thermally upgraded paper are more suitable for natural ester impregnated paper insulation.
出处
《电工技术学报》
EI
CSCD
北大核心
2009年第12期12-17,共6页
Transactions of China Electrotechnical Society
基金
国家重点基础研究发展计划项目(973项目)(2009CB724501-1)
国家自然科学基金(50677073)
国家杰出青年科学基金(50425722)资助项目
关键词
变压器
绝缘
老化
天然酯
热稳定纸
聚合度
Transformer
insulation
aging
natural ester
thermally upgraded paper
degree of polymerization
