No.4 Business Building-2707, China Central Place
Chaoyang District, Beijing-100021, China
Email:[email protected]
北 京 大 林 绿 源 环 保 科 技 有 限 公 司
BEIJING DAELIM GREEN EP TECH CO., LTD.
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.
Whensurgesoccur,thearresterimmediatelylimitstheovervoltagetotherequired protectivelevelby
conductingthesurgecurrenttoground.Uponpassageofthesurge,thearresterreturnstoitsinitialstate,
conducting minimal leakagecurrent.
Dead front SurgeArresters
Dead front Surge Arrester (Fig. 19 A) also called elbow arrestor is a pre-molded rubber elbow that houses zinc
oxideVaristortechnologytoprovideovervoltagesystemprotectiontodeadfrontpadmounttransformers.
Fig. 19A