摘要
为了分析汽轮发电机励磁绕组匝间短路故障机理,建立考虑转子铁心涡流影响的汽轮发电机空载时励磁绕组匝间短路多回路数学模型。用气隙磁导法推导了与汽轮发电机励磁绕组有关的单个线圈间电感系数的计算公式。采用该模型对空载时有无励磁绕组匝间短路故障2种工况分别进行仿真,得到了励磁电流、定子并联支路环流、定子电压仿真波形。通过仿真研究还得到励磁绕组匝间短路后的2个故障特征:在外加恒定励磁电压的情况下,励磁电流逐渐增大到另一个稳定值;定子并联支路间出现了环流。通过实验验证了所建多回路数学模型的正确性。为汽轮发电机励磁绕组匝间短路故障检测和诊断提供参考。
In order to analyze the fault feature of the field winding inter-turn short circuits,this paper proposed multi-loop mathematical model of turbine generator with field winding inter-turn short circuits fault considering eddy effect of the solid rotor.The inductance related to the field windings was given,the normal and the short circuits fault operation conditions of generator under no load had been simulated based on the model,which was verified by the simulation and the experiment results.A summary of fault features were obtained,such as,the harmonics circumfluence of stator parallel branches emerges and the field current increases gradually to a new constant value under the constant field voltage after the field windings short fault.The model and results provide the theoretic basis for fault analysis and fault diagnosis of turbine generator with field winding inter-turn short circuits.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2010年第33期58-64,共7页
Proceedings of the CSEE
基金
高等学校博士学科点专项科研基金项目(20060079007)
河北省自然科学基金项目(08B005
E2010001705)
华北电力大学博士研究生创新资助计划–拔尖博士培育计划基金(XM0016)~~
关键词
多回路数学模型
励磁绕组匝间短路
仿真
汽轮发电机
multi-loop mathematical model
field windings inter-turn short circuits
simulation
turbine generator
