摘要
分析了大电机主绝缘在运行过程中产生老化的机理 ,确定了电、热和机械应力各因子老化试验的参数 ,建立了多因子老化的试验模型 ,研制开发了电 -热 -机械应力三因子联合老化的试验系统 ,设计了分段处理试样制备方案。经模型线棒的老化试验验证 ,在不同老化因子作用下局部放电的放电量、放电次数和放电脉冲分布等参量都有不同的变化规律。结果表明 ,三因子联合老化试验系统能满足研究大型发电机主绝缘在多因子联合作用下的老化规律和评估其剩余寿命的试验要求。
The aging mechanism of stator winding insulation of large generator in operation is analyzed, the parameters of aging test, e. g. electrical stress, temperature, frequency and amplitude of mechanical vibration, are determined, the model of aging test and aging test system of synchro triple stresses is designed and installed, a new way of model bar divided into several samples is suggested. The PD test results of model bars aged under different stresses display that there are larger differences in the discharge magnitude, discharge impulse number and discharge impulse distribution etc. It is verified that the test system is satisfactory for investigation of aging law and residual life for stator winding insulation of large generator subjected electrical, thermaland mechanical stresses.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2001年第4期18-20,56,共4页
High Voltage Engineering
基金
国家自然科学基金重点资助项目 ( 5 98372 6 0 )
关键词
大型发电机
主绝缘
三因子联合老化试验装置
试样设计
large generator stator winding insulation aging test facility of combined triple stresses design of samples
