An accurate calculation method of transformer calibration parameters

Designs a transformer calibrator method. The difference method is used to check the ratio difference angle difference of current and voltage transformers respectively. The signal waveform is drawn in real time by fast Fourier algorithm, and the spectrum correction of rectangular window and Hanning window is carried out to solve the problem of spectrum leakage. The output signal of the transformer is verified, and the results show that the calibrator meets the accuracy standard of 0.05 level.