Polymer Surge arrester with gaps is a kind of lightning arrester for distribution lines. It is the key equipment in the electric power system. They are protecting the equipment against the lightning overvoltage impulse and operation overvoltage impulse. There are two types of lightning arresters in the power system, one is surge arrester with porcelain housing, and another is surge arrester with polymer housing. There is only a difference in the insulating housing. We also call surge arresters with polymer housing Silicone polymer housing surge arrester or composite metal oxide surge arrester. We call surge arresters with porcelain housing metal oxide surge arresters.
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