Lightning stroke is one of the most important influences on secure running of wind turbine generator（WTG）. The base of wind turbine

the core of internal controlling cable

and the cable shielding layer will generate induced voltage when the WTG suffers from lightning stroke. Considering electro-magnetic inducted voltages of inductance and capacitance

we build an equivalent model including wind turbine blade

tower and signal cable to study transient overvoltage caused by lightning stroke better. Furthermore

the simulation is conducted by utilizing ATP/EMTP electro-magnetic transient simulator. Finally

we analyze the influence of wind turbine signal cable on induction voltage by three factors

such as the wind turbine grounding resistance

the lightning current waveform

and the height of tower. The results show that wave head time is inversely proportional to voltage

when wave head time is 1.2 μs

voltage difference in the top of the tower is 1 611.6 times larger than 20 μs; the higher tower is

the greater the voltage difference is; grounding resistance is proportional to the ground potential of tower base

when the grounding resistance is 10 ?

the voltage of tower base is 8.4 times larger than 1 Ω.