变压器绕组变形的纳秒脉冲频率响应仿真研究

Simulation Research of Nanosecond Pulse Frequency Response of Transformer Winding Deformation

为实现电力变压器绕组变形故障的在线检测,提出一种纳秒脉冲频率响应法。基于频率响应法的基本原理,通过理论计算得到纳秒脉冲的关键参数。使用Pspice软件建立一台单相变压器绕组的等效电路的数值仿真模型,并分别用纳秒脉冲频率响应法和扫频频率响应法对健康状况下的绕组进行对比分析。同时用纳秒脉冲频率响应法获得轴向变形、幅向变形和短路故障状态下的绕组频率响应曲线。结果表明:纳秒脉冲频率响应曲线与扫频频率响应曲线的一致性较高;幅向变形和轴向变形对绕组频率响应曲线的改变较小,主要集中在[200 kHz,300 kHz];短路故障对绕组频率响应曲线的改变反映在全频段[1 kHz,1 MHz]的偏移上。

To realize on-line detection of faults attributable to power transformer winding deformation,this paper proposed a nanosecond pulse frequency response method. Based on the basic theory of frequency response method,key parameters of nanosecond pulses were obtained through theoretical computation. A numerical simulation model was established through Pspice software for the equivalent circuit of the winding of a single-phase transformer. A comparative analysis was made on the windings in their healthy conditions in the nanosecond pulse frequency response method and the swept frequency response method,respectively. Furthermore,frequency response curves of the winding were obtained in the nanosecond pulse frequency response method under the conditions of axial deformation,amplitude deformation and short-circuit fault. The results showed that the frequency response curve of nanosecond pulse was in good consistency with that of the swept frequency response curve,that the amplitude transformation and axial deformation changed the frequency response curve of the winding to a limited extent,mainly in the range of [200 kHz,300 kHz],and that the change of the curve caused by short-circuit fault was reflected in the offset of the full band of [1 k Hz,1 MHz].