摘要
为探究变频电流激励下发电机定子铁心表面、故障点的温升趋势和故障点短路电流的变化情况,在定子铁心上选取不同线圈匝数的短路故障点,开展了工频(50 Hz)和高频(250 Hz)下定子铁心磁化试验,记录不同频率下铁心的温升;在同一工况下施加不同频率(50、100、150、200、250、300 Hz)的正弦波进行铁心磁化试验,记录不同励磁电流频率下铁心模拟故障点的故障电流。试验结果表明:高频电流激励下铁心表面温度及故障点温度的上升趋势具有较好的一致性,并且不同频率下的故障点短路电流无明显变化,验证了基于变频电流激励的发电机定子铁心磁化试验的可行性。
In order to explore the temperature rise trend of the stator core surface and fault points and the variation of the short-circuit current of the fault point under the excitation of variable frequency current,the short-circuit fault points with different coil turns were selected on the stator core,while the magnetization test of the stator core under the power frequency(50 Hz)and high frequency(250 Hz)was carried out to record the temperature rise of the core under different frequencies.The magnetization test of the core was carried out under the same working condition by applying different frequencies(50,100,150,200,250,300 Hz)of sine wave to record the fault current of the simulated fault point of the core under different exciting current frequencies.Test results show that,the temperature rise trends have a good similarity between the stator core surface and the fault points with high frequency current excitation,and there is no significant change in the short-circuit currents of fault points under different frequency conditions.It is verified that the magnetization test of generator stator core based on variable frequency current excitation is feasible.
作者
顾昊晟
Gu Haocheng(East China Electric Power Test and Research Institute,China Datang Group Science and Technology Research Institute Co.,Ltd.,Hefei230088,China)
出处
《发电设备》
2024年第5期278-282,共5页
Power Equipment
关键词
发电机
定子铁心
磁化试验
短路故障
变频电流
generator
stator core
magnetization test
short-circuit fault
variable frequency current
