基于电磁场有限元方法的大型发电机定子槽绝缘故障诊断分析  

Fault Diagnosis Analysis of Large-scale Generator Stator Trough Based on Electric Field Finite Element Method

作　　者：姜刚[1] 刘念[1] 肖玲[1] 刘秀兰[1] 

机构地区：[1]四川大学电气信息学院,四川成都610065

出　　处：《四川电力技术》2008年第5期53-55,共3页Sichuan Electric Power Technology

摘　　要：发电机在运行过程中,在定子线圈槽口、定子线圈与槽壁之间,线圈绝缘表面的电场分布是不均匀的。当上述部位的局部电场强度达到临界场强时,容易产生电晕现象,而且线圈的间隙在电场作用下,当工作电压达到间隙的起始放电电压时,还会发生局部放电。因此,定子线圈槽部电场的计算显得尤其重要,基于电磁场有限元方法,以大型发电机的定子槽作为分析模型,应用ANSOFT专业有限元分析软件对其进行了电场分析,得出定子槽内部的电场分布,实现对大型发电机定子槽绝缘故障诊断分析.通过分析得到整个电机电位的分布及电场强度的分布,分析结果有助于对电机进行优化设计和控制。In operation of the generators, electrical field strength in the passage of the stator bar, between the stator bar and the tank wall, or on the insulation of the coil＇s surface is uneven. When the electrical field strength reaches a critical level, the corona phenomenon arises. What＇s more, under the affection of electric field, when the working voltage reaches the discharging voltage, partly discharging will happen in the gap of the coil. So, the electric field＇s calculation in coil slot is of great importance. This article introduces the basic principle of finite element. Using the large - scale generator stator trough as the analysis model and a professional finite element analysis software - - ANSOFT for the electric field analysi.

关 键 词：发电机 电场 ANSOFT 有限元法 

分 类 号：TM306[电气工程—电机]