A bank of parallel branches of a SC and its MOV is represented for the fundamental frequency phasors by equivalent resistance and reactance, connected in series (Fig.4a).
The program containing the ELECTRICAL NETWORK and the MODELS units of the ATP-EMTP package [5]
(Fig. 4b) has been developed for determining the equivalents. The equivalent resistance and reactance are obtained as dependent on amplitude of current entering the original circuit. This is achieved by scanning over the wide range for amplitude of the fault current entering the SC&MOV.