Aiming at the problem of large power supply and limited frequency band when acquiring the Capacitor Voltage Transformer（CVT） transfer characteristics by the frequency sweep method

a method for obtaining the CVT transfer characteristics based on the time domain regression model is introduced. When the CVT works in a linear state

its transfer function can be expressed as a fractional form composed of polynomials in the s-domain

and its time domain regression model can be established. Based on the obtained CVT primary and secondary data by the single-shot tests

a parameter identification method based on the amplitude modulation matrix and robust matrix is proposed after taking into account the multi-peaks and robustness of the time domain regression model in actual modeling. The credibility evaluation is performed after comparing the transmission characteristics curve obtained by the established time domain regression mode with that measured by the frequency sweep method. The results show that the mean value of the error curve is within the 95% confidence interval of the null hypothesis. Therefore

the proposed method for obtaining transmission characteristics can provide a reference for quickly obtaining CVT transmission characteristics in the field.