两相短路时汽轮发电机组轴系扭振安全性分析  

Safety Analysis on Torsional Vibration of Turbo-generator Shafts Under 2-Phase Short-Circuit Condition

作　　者：庞乐[1] 顾煜炯[1] 金铁铮[1] 陈东超[1] 

机构地区：[1]华北电力大学电站设备状态监测与控制教育部重点实验室,北京102206

出　　处：《现代电力》2010年第5期82-85,共4页Modern Electric Power

基　　金：新世纪优秀人才资助计划(NCET-08-0769)

摘　　要：采用改进的雨流法计数模型和修正的线性疲劳累积损伤理论计算两相短路时汽轮发电机组危险部位的寿命损耗,以适应电厂对寿命损耗实时监测的要求,并使计算结果更加准确。考虑到发生两相短路时以机组轴系最大扭应力作为轴系扭转振动的评估指标存在一定的局限性,提出了以疲劳寿命损耗作为轴系危险部位安全性的评估标准,并结合实例进行了计算分析,得到了两相短路故障下轴系危险部位疲劳寿命损耗量随时间的变化曲线。Improved rain-flow counting method and modified linear cumulative fatigue damage theory are used to calculate life loss in the dangerous area on two-phase short-circuit working condition.It not only meets the requirement of real-time monitoring in the power plant but also makes the result more accurate by this way.Due to the limitations of taking maximum torsional stress as the index of torsional vibration assessment for axis system,this paper proposes fatigue life loss to reflect the safety of dangerous area.An example is given and the curve of fatigue life loss with time under two-phase short-circuit working condition is drawn finally.

关 键 词：扭振 安全性分析 雨流计数法 疲劳寿命损耗 短路时间 

分 类 号：TM311[电气工程—电机]