基于谐振点数学指数的电力变压器绕组变形的诊断方法

The Mathematical Idex Based on Resonance Point to Detect the Winding Deformation of Power Transformer

频率响应分析法是检测电力变压器绕组变形的常用诊断方法之一。近年来,频率响应分析法的检测流程趋向标准化;但寻求合适的算法对频响曲线数据进行量化分析仍需深入研究。根据电力变压器绕组变形前后的频响曲线中谐振点的变化,获取所提出的数学指数变化规律,探究合适的数学指数对频响曲线数据进行量化分析。研究表明:在基于谐振点的数学指数中,谐振点偏移率IAD和IFD数值的正负性可综合诊断绕组变形的类型;加权函数值W_a和W_f可综合诊断绕组变形的程度。

Frequency response analysis method is commonly used to monitor and diagnose the health status of winding of power transformer.Nearly a decade of research has prompted testing process of frequency response method toward standardization,but a suitable algorithm for quantitative analysis of curve data still needs further study.The mathematical Idex based on resonance point has been put forward according to the variation pattern of the resonance point of the frequency response curve.The research shows that positive and negative of the values of index of amplitude deviation frequency deviation based on resonance point can comprehensively diagnose the type of winding deformation and that the value of the weighted function can synthetically diagnose the degree of winding deformation.