Common Causes of SPD Degradation

When surge protective devices (SPDs) are properly specified and installed, they provide effective protection against transient overvoltages. In normal operation, SPDs shunt transient overvoltages to ground, allowing only current with a small portion of the surge current to pass the SPD toward the load equipment. Nevertheless, conditions can arise that degrade SPD performance. This paper describes possible causes of SPD degradation and provides responding recommendations for preserving integrity of surge protection systems.


SUMMARY

Surge protective devices routinely provide effective protection against transient overvoltages. Nevertheless, repeated exposure to electrical surges can degrade SPD components and their performance.

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