The increased capacity of wind turbines increases the probability of lightning-induced damages to the blades. Simulations were conducted to investigate the lightning shielding performance of large-capacity wind turbine blades. The lightning strike rate at various receptor installation sites for 1.5 MW and 6.7 MW wind turbine blades were presented. It is found that only downward lightning flashes with smaller current amplitudes can attach to the inner region of the wind turbine blade. The corresponding lightning current that the blade tip can effectively shield other parts of the blade increased from 7.5 kA to 10 kA as the capacity of wind turbines rose from 1.5 MW to 6.7 MW. However, it is important to note that the protection performance provided by the blade tip gradually diminishes as one moves deeper toward to the root of the blade. Specifically, our simulations show that compared to a 1.5 MW wind turbine, there is a factor increase of 1.71 in terms of LSR for inner region of a 6.7 MW wind turbine.