It is important to understand the difference between lightning protection systems and SPDs. The purpose of lightning protection systems is to guide direct lightning strikes to the ground through a large number of current carrying conductors, thereby preventing structures and equipment from being in the discharge path or being directly hit. SPD is applied to electrical systems to provide a grounded discharge path to protect the components of these systems from high-voltage transients caused directly or indirectly by lightning or power system anomalies. Even with an external lightning protection system, without SPD, the impact of lightning can still cause significant damage to components.
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