Why Can't Insulators Withstand Lightning Strikes?

suspension insulator plays an important role in the power system, but due to the material and structural characteristics, suspension composite insulator usually has a certain degree of insufficient lightning resistance. Since composite suspension insulator mainly relies on its surface insulation performance to prevent current leakage, when lightning strikes, the high voltage and strong current of lightning often exceed the withstand range of polymer suspension insulator. Especially in the case of direct lightning strike or induced lightning, the insulation layer of suspension type insulator may be broken down instantly, resulting in damage to electrical equipment or short circuit faults.