水分和酸对矿物油与天然酯混合油-纸绝缘热老化的影响  

Influence of Water and Acid on the Thermal Aging of Mineral Oil Mixed With Natural Ester Oil-Paper Insulation

作　　者：廖瑞金[1] 郝建[1] 梁帅伟[1] 朱孟兆[1] 杨丽君[1] 

机构地区：[1]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

出　　处：《电工技术学报》2010年第7期31-37,共7页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(50677073);国家杰出青年科学基金(50425722)资助项目

摘　　要：为了研究矿物油与天然酯混合油-纸绝缘(混合油-纸绝缘)的热老化特性,揭示天然酯的存在对混合油-纸绝缘体系中水分和酸的影响,对矿物油-纸绝缘、混合油-纸绝缘在110℃下进行了加速热老化实验,通过分子模拟分析了这两种油-纸绝缘体系中水分与绝缘油和水分与绝缘纸的相互作用,并对老化后的绝缘纸进行了红外光谱分析。研究结果表明:混合油-纸绝缘抗老化能力优于矿物油-纸绝缘;混合油-纸绝缘中的天然酯能与水分和酸形成稳定的氢键,减弱水分和酸对绝缘纸的协同危害作用;混合油-纸绝缘系统中,绝缘纸纤维素上羟基和脂肪酸的酯化反应能抑制绝缘纸老化。In order to study the aging characteristics of mineral oil mixed with natural ester oil-paper insulation（mixed oil-paper insulation） and reveal the effect of natural ester on the water and acid dissolved in the mixed oil-paper insulation system, the accelerated thermal aging test of mineral oil-paper insulation and mixed oil-paper insulation under 110℃ are performed. The interaction between water and oil, together with the interaction between water and insulation paper in the two types of oil-paper insulation systems are analyzed by the molecular simulation, and the infrared spectroscopy of aging papers are also researched. The results show that： the anti-aging of mixed oil-paper insulation is better than mineral oil-paper insulation. In mixed oil-paper insulation system, the natural ester can form stable hydrogen bonds with water and acid, which weakens the synergy endangerment role caused by moisture and acid on the insulation paper. The reactive -OH groups on the cellulose can react with fatty acids and this can inhibit the aging of insulation paper.

关 键 词：油纸绝缘 热老化 水分 酸 纤维素 天然酯 

分 类 号：TM835[电气工程—高电压与绝缘技术]