典型故障下自耦变压器分裂式绕组的频率响应特征

基于搭建的自耦变压器分裂式绕组故障模拟试验平台,在各独立绕组上模拟短路和轴向移位2种典型故障,测试无故障、典型故障下分裂式绕组的整体频率响应和各独立绕组的频率响应;计算特征频带内故障时相对于无故障时频率响应频率和幅值的偏移量,并模拟分析绕组故障下电气参数,探究频率响应特征及其变化机理.结果 表明:在0～100 kHz低...

Frequency Response Characteristics of Autotransformer Split Winding under Typical Faults

Based on the split winding fault simulation test platform of autotransformer,two typical faults of short circuit and axial shift were simulated on each independent winding,and the overall frequency response of split winding and the frequency response of each independent winding under fault-free and typical fault were tested.The offsets of frequency and amplitude of response frequency in the characteristic frequency band relative to the fault free were calculated.The electrical parameters under winding fault were simulated and analyzed,and the characteristics of frequency response and its change mechanism were explored.Results show that in the low frequency range of 0~100 kHz,the amplitude of the overall frequency response increases with the increase of the degree of short circuit fault,but the axial shift remains unchanged.In the characteristic frequency range of 90~110 kHz,the first peak amplitude offset of the overall frequency response increases in turn when S1,C and S2 windings are short circuited,and the frequency offset increases.The amplitude offset of the second wave trough increases with the shift of S2 winding,remains basically unchanged with the shift of S1 winding,and decreases with the shift of C winding.The frequency offset is basically unchanged under the shifts of S1 and S2 windings,and increases with the shift of C winding.The longitudinal equivalent capacitance and self-inductance decrease under short circuit fault,which leads to the decrease in the amplitude of the overall frequency response of the medium frequency band.The ground capacitance increases when the S2 winding is shifted,resulting in the maximum amplitude offset of the second wave trough.