The present standard has requirement on the discharge performance of the discharge coil

but the study on the precise calculation of the discharge process from shunt capacitor with discharge coil is veryless. In this paper

the equivalent circuit model of discharge circuit of shunt discharge coil in single capaci-tor bank is set up and the determination method for each parameter of the model is given. The discharge pro-cess via discharge coil of single phase capacitor is calculated by EMPT and the calculation result and actu-al measurement discharge process are in good agreement. The influence of discharge coil parameter on thedischarge process is studied by the use of discharge circuit model in this paper. It is shown by the resultthat the resistance of primary winding of discharge coil is increased

the voltage on both sides of capacitorduring the discharge process is reduced

the oscillation decay process of current and voltage fasten

the sat-uration inductance of discharge coil is reduced

the first peak of voltage oscillation is reduced and voltagerate variation is increased. With the decrease of saturation inductance of discharge coil

the first peak ofvoltage oscillation is reduced significantly and charge release speed is accelerated.