In the existing standard

DC voltage is only employed for routine voltage-withstand tests of series capacitor. However

AC voltage-withstand test conforms to the actual working conditions. In this study

according to the cold duty test in the IEC type test standard for series capacitors

actual working conditions were considered to modify the routine overload test of series capacitors at power frequency. Firstly

the software MATLAB was adopted to design a feasible scheme of the test circuit. Subsequently

a test platform in accordance with the waveform parameters of IEC cold duty test was established

and tests on real samples were conducted

and the results showed that the capacitance varies with the number of test irregularly. Finally

some suggestions were offered about substituting the routine series capacitor short-circuit overload capability test for the IEC type test.