At the heart of the surge arrester unit is the MO varistor column, which constitutes its active part. These blocks are made of zinc oxide (ZnO) and other metallic powders mixed together and then pressed into. A Surge Arrester (also called lightning arrester or surge protective device, SPD) is an essential protective device used in power transmission and distribution systems to protect equipment — such as transformers, switchgear, and bushings — from damaging overvoltages caused by lightning strikes and. Surge arresters are used to protect high-voltage equipment in substations, such as transformers, circuit breakers and bushings, against the effects of lightning and switching surges. It protects electrical equipment such as transformers, insulators, and circuit breakers from overvoltage transients. These include. Distribution type arresters are vital components in electrical systems.
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