Surge Arrester in Parrallel
Surge Arrester in Parrallel
(OP)
Does any one know the performance of two surge arrester in parrallel for distribution application_
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Surge Arrester in Parrallel
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RE: Surge Arrester in Parrallel
Ideally, we expect the parallel surge arrestors to double the discharge current handling capability.
RE: Surge Arrester in Parrallel
Contrary to the obove, one reputable surge arrester manufacturer claim that two Metal Oxide Surge Arrester (MOSA) in parallel conduct current at the same time. On the other hand I have recently the opportunity to observe in a current application in Puerto Vallarta, Mexico, a few failures in single arrester but none failure in a parallel connection.
I hope others in this forum could join us discussing if there is any merit using two MOSA in parallel at least for MV distribution application.
RE: Surge Arrester in Parrallel
RE: Surge Arrester in Parrallel
I know theoretically, the MOSAs have more predictable behaviour and closer tolerances. The Mexico experience you cited could be a confirmation.
Some one from Surge arrestor industry may have more to say on the subject.
RE: Surge Arrester in Parrallel
Whereas this does not contradict your theory, and only stated fyi, MOSA's are gapless.
RE: Surge Arrester in Parrallel
RE: Surge Arrester in Parrallel
After each storm we had to replace many failed arrestors, blown apart by more fault current than what they could handle. We noticed that arrestors installed in the midwest and areas prone to lightning were much larger than the little guys our utility was purchasing.
Unable to talk our company into getting larger more robust arrestors, we starte putting them up in parallel. I beleive they were MOV (MOSA as you call them now). I don't believe we ever blew up a Parallel set, but neither could we quantify what duty they sustained. Very unscientific but we got some emotional satisfaction out of it