热老化对矿物油及混合油纸绝缘水分平衡曲线的影响
Moisture equilibrium curves are widely used to estimate the moisture content of insulation paper in field transformers. The thermal aging effects on moisture equilibrium curves of mineral oil-paper and a new aging-resistant mixed oil-paper insulation system were studied. The purpose was to assess the moisture content accurately, particularly in transformers used for long-term operations. Thermal aging experiment was conducted at 130℃ for 80 days, and moisture equilibrium curves at five different aging degrees and three different temperatures were constructed. Results showed that with deepened aging degree, moisture equilibrium curves shifted toward the abscissa axis of the rectangular plane coordinate system. The mass fraction of moisture content in oil and paper was calculated at each aging degree. Comparative results revealed that the moisture absorption capacity of insulation paper had an age-related decreasing tendency, whereas the moisture absorption capacity of insulating oil had an age-related increasing tendency. The moisture equilibrium curves of mixed oil-paper insulation system at 85℃ of 5 different aging degrees are shown in Figure 1.
矿物油 混合油纸 绝缘水分 平衡曲线 热老化处理
廖瑞金 林元棣 夏桓桓 郭沛
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 云南电力试验研究院(集团)有限公司电力研究院,昆明,650051
国内会议
西安
中文
197-198
2013-10-17（万方平台首次上网日期，不代表论文的发表时间）