变压器绕组变形的扫频短路阻抗诊断方法研究

Diagnosis Method Study of Transformer Winding Deformation Basing on Sweep Frequency of Short Circuit Impedance

变压器绕组变形会影响变压器的安全运行,甚至会造成电网的事故。目前主要有短路阻抗法和频率响应法用于分析变压器的绕组变形情况,但是两种方法都有各自的优缺点,存在一定的局限性。文中提出扫频短路阻抗法,通过分析不同频点下短路阻抗的互差,用于分析判断变压器的绕组变形,并将该方法应用于新出厂变压器以及现场运行变压器的诊断。

The winding deformation of power transformer would affect its safe operation and even cause the grid accident. The short-circuit impedance and frequency response method are the main methods, but both of them have some limitations. In this paper the sweep frequency of short-circuit impedance method is presented and the windings deformation based on the mutual difference of short-circuit impedance at different frequencies is analyzed. The validity of this method is preliminary verified at last.