There are various methods to test the error of high-voltage current transformer

however

there is little analysis on the difference and accuracy among testing results of these methods. The error of high-voltage current transformer is tested and compared with single-phase testing

absolute value calculation of the current error considering the influence of voltage and current error testing under rated voltage. And the reason of their differences is analyzed.The results show that voltage has a negative influence on ratio error and phase displacement of current transformer

and its effect is mainly predominant at currents less than 20% of rated current. The larger the current is

the smaller the influence will be

and the influence decreases gradually until it can be neglected with the increase of current. The current errors tested at low voltage are inaccurate at low current

and the absolute value of the variations of current error is much larger than the results tested at high voltage

as a result

the current error of high-voltage current transformer should be tested directly at rated primary voltage.