A failure of 220 kV bus due to successive lightning strikes in Fushan high voltage substation is analyzed.According to the on-site inspection and the fault recording

it is found the grounded short circuits of No.3 bus phase-C and No.2 Bus phase-A happened in succession due to lightning strikes to cause the failure

and the shunt capacitor in running state raised the Fugang line voltage.An equivalent model is established based on EMTP to analyze the overvoltage of Fugang line and the influence of shunt capacitor on bus overvoltage.It is found that the overvoltage under failure condition surpassed the protection setting

and the shunt capacitor resulted in the rise of bus overvoltage.In addition

some countermeasures are put forward

i.e.

redesigning the insulation coordination

installing arresters on the 200 kV and 500 kV buses

and developing new lightning protection technology for special geographical environment.