The circuit parameters of impulse rectangular current generator for energy enduring test of non-linear varistor are simulated and calculated

the relation between the parameters of circuit and the parameters of the impulse current waveform are derived. The theoretical calculation and testing results testify that selecting appropriate inductance L

whose values are reduced in turn according to a certain scale

can not only restrain overshoot of the wave front

but also lessen the amplitude descent of rectangular wave within the current duration. The impulse current waveform

according to IEC and GB standards

can be obtained in the wider dynamic non-linear varistor range environment.