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6.5 Surge Arresters
ELECTRIC SHOCK: Can cause severe injury, death, or damage to equipment. De-energize transformer
from a remote upstream source before servicing or operating surge arresters or disconnect switches.
Check that all transformer terminals and bushings have zero voltage. Ground transformer following
industry accepted safe grounding practices.
CAUTION: Excessive test voltage can damage surge arresters. Disconnect surge arresters before
running impulse or applied potential tests on the transformer.
Surge Arresters (Fig. 16) are provided optionally in padmount transformers to protect equipment and cables
from overvoltage surges.
During steady state conditions, line-to-ground voltage is applied continuously across the arrester terminals.
When surges occur, the arrester immediately limits the overvoltage to the required protective level by
conductingthesurgecurrent toground.Uponpassage ofthesurge,thearresterreturnstoitsinitialstate,
conducting minimal leakage current.
Dead front SurgeArresters
Dead front Surge Arrester (Fig. 19 A) also called elbow arrestor is a pre-molded rubber elbow that houses zinc
oxideVaristortechnology toprovide overvoltagesystemprotectiontodeadfrontpadmounttransformers.
No.4 Business Building-2707, China Central Place
Chaoyang District, Beijing-100021, China
北 京 大 林 绿 源 环 保 科 技 有 限 公 司
BEIJING DAELIM GREEN EP TECH CO., LTD.
Fig. 19A
Email:info@daelim-electric.com
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