频响阻抗法诊断变压器绕组变形

变压器绕组变形是变压器的主要故障类型之一,严重威胁电网安全。为此,提出频响阻抗法诊断变压器绕组变形。研究了变压器绕组在低频和中频段的阻抗频率特性,以频率响应的测试接线为基础,测量相关的电压和电流值,对测得的电气数据进行处理以获得阻抗频率曲线,通过对比曲线间的差异实现对变压器绕组变形的诊断。建立了变压器绕组变形的仿真模型,通过改变模型中不同类型元件的参数值模拟绕组故障。仿真结果表明该方法能明显反应绕组故障,验证了频响阻抗法的有效性。

Impedance-based Frequency Response Analysis for Diagnosing Transformer Winding Deformation

Transformer winding deformation is one of transformer faults of the main types, which threatens the security of power grid. Hence, impedance-based frequency response analysis is proposed to diagnose transformer winding deformation. Impedance frequency characteristics of transformer winding in low and intermediate frequency were further studied. Based on the wiring of frequency response analysis, relevant data of voltage and current is measured and processed to make impedance frequency curves. Transformer winding deformation is diagnosed through the comparison among the difference of response curves. The simulation model of transformer winding deformation was established, in which parameter values of different types of element were changed to simulated winding deformation. The simulation results showed that the proposed method can response winding deformation obviously, which validated the effectivity of the frequency response impedance method.