Simulation research on distribution of short-circuit current of transmission lines after lightning flashover

Based on the principle of calculating asymmetric faults, this paper made accurate simulation research on distribution of short-circuit current and its factors affecting it using electromagnetic transient analysis program ATP-EMTP for 220kV transmission lines. Conculsions are gotten that most of short-circuit current is dispersed by lightning conductors and and shunt coefficient under operating frequency is very different from that under lighting current. This is of great significance theoretically for checking and selection of the lightning conductor on thermal stability^[1], potential increase and positioning of flashover towers, electromagnetic influences on adjacent communication lines, economical design of grids and so on.