大型发电机主绝缘多因子老化过程中介损温谱的研究  

Study on temperature spectrum of dielectric dissipation during multi-stress aging of large generator stator insulation

作　　者：马小芹[1] 卢伟胜[1] 乐波[1] 谢恒堃[1] 

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,陕西西安710049

出　　处：《电工电能新技术》2003年第1期48-51,共4页Advanced Technology of Electrical Engineering and Energy

基　　金：国家自然科学基金重点资助项目(59837260)

摘　　要：本文通过大型发电机定子主绝缘的联合三因子加速老化试验,研究了主绝缘的介质损耗角正切tanδ的温谱随老化时间的变化规律,提出0 2Un下tanδ T曲线峰值对应的温度Tm可作为表征绝缘老化状态的特征参量,并对其随老化时间的变化规律进行了研究。结果表明,0 2Un下tanδ T曲线峰值对应的温度Tm随老化时间的增加而逐渐升高。In this paper,the multi\|stress accelerated aging experiment has been conducted on the stator bars of a large generator.The temperature spectra of dielectric dissipation tanδ of stator insulation at different aging time are investigated.It is found that the peak temperature Tm of the tanδT curve under 0.2Un shifts to higher temperature with aging time and can be used to estimate the aging condition of large generator stator insulation.At the same time,the geadient of the peak decreased with aging time and disappeared after final aging cycle.

关 键 词：大型发电机 主绝缘 多因子老化 温谱 汽轮发电机 介质损耗 

分 类 号：TM311[电气工程—电机]