Aiming at the shortcomings of the existing single-point frequency method in measuring the transfer impedance of HFCT（High Frequency Current Transformer） with partial discharge

a novel method based on pulse source is proposed. The proposed method adopts a pulse signal as the injecting source and can obtain the transfer impedance curve within the detection band by measuring only once

it greatly reduces the test time

improves the test efficiency

and has the advantages of simple operation and high resolution. An experimental platform is built

and the transfer impedances of various types of HFCTs are measured. Moreover

the influences of pulse signal source on the measurement results are analyzed. Finally

the pulse injection method and the single-point frequency method have been compared. The results show that Gaussian pulse with a rise time shorter than 10 ns should be used as the signal source. The measured transfer impedance curves of the pulse injection method and the single-point frequency method are highly consistent. The mean difference of the transfer impedance curves obtained by the two methods is at most 0.1 V/A

the root mean square error is less than 0.25 V/A

and the correlation coefficient is larger than 0.85.