For solving such problem that the voltage withstand test for the inter-turn insulation of core reactor coils cannot be performed effectively

the resonant high-frequency inter-turn insulation withstand voltage test scheme is proposed in this paper.The evidence of voltage selection through explaining the advantage of the high-frequency method by way of comparison and analysis

the relationship between test current and frequency is also given and the test frequency range meeting serial and shunt reactance is proposed.The analytic expression of the relationship between the output voltage of the inverters and the terminal voltage of the testing reactor under the resonant condition is given and the time domain synchronization algorithm for detection of the resonant condition and the frequency tuning is analyzed.A resonant high-frequency inter-turn insulation withstand voltage test system is set up

the main parameters of series-shunt hybrid compensation capacitor are analyzed in the test of series reactor

and the selection principle of the key parameters of the corresponding resonant test circuit is given.It is shown by the experimental result that the resonant high frequency method in this paper can effectively detect the inter-turn insulation defects of iron core reactor

which provides an important reference for practical engineering applications.