A transformer frequency response testing device and method based on convolution compensation

Abstract

The application provides a transformer frequency response test device and method based on convolution compensation, which comprises a signal generating unit, a double-channel signal collecting unit, a data storage and interaction unit, a central processing and control unit, a standardized interface module and a calibration module. By injecting a broadband calibration signal into the test cable, the incident signal, the output signal and the reflected signal are collected to calculate the preliminary transfer function of the cable; the cable transfer function is fitted based on the convolution integral model, the phase frequency characteristic is directly measured by using the reflected signal, and the transfer function of the cable is obtained; then the transformer frequency response test is carried out, the transmission distortion of the excitation cable and the response cable is respectively deconvoluted and compensated, the real transfer function of the transformer winding is calculated, and the amplitude frequency and phase frequency characteristic curves are generated. The frequency coupling effect of the cable is described by introducing the convolution integral operator, the accuracy of the transformer frequency response test is improved, and a reliable basis is provided for the winding deformation diagnosis.

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