I was under the impression that MOV devices are "damaged" somewhat during
each protection event and eventually enough "damage" accumulates and they
have to be replaced.
Maybe someone with more knowledge will comment on that.
If this is the case, it seems that a big hit might use up a lot of the
reserve.
73,
Gerald K5GW
In a message dated 6/3/2009 7:50:34 P.M. Central Daylight Time,
kkbroadcastengineering@gmail.com writes:
MOV's should fail shorted or destroyed. A visual or simple continuity
check will locate those. Occasionally they will fail open. There is a
HV tester for MOV's but if you have access to a megger or hipot tester
that will work as well.
Otherwise just replace them all. They are cheap and very effective...
john@kk9a.com wrote:
> WX0B relays are pretty tough, I have had many direct lightning strikes
and
> no relay damage - even with no MOV protection near the relay.
>
> I have had MOV's short after a direct hit, so sometimes they fail
closed. I
> always replaced any that were obviously burnt even if open.
>
> John KK9A
>
>
--
Kevin C. Kidd, CSRE/AMD
WD4RAT
mailto:kkidd@kkbc.com
KK BROADCAST ENGINEERING
http://www.kkbc.com
AM GROUND SYSTEMS CO.
http://www.amgroundsystems.com
51 Ridge Ln
Lawrenceburg, TN 38464
Local: 931-766-2999
Nation Wide: 877-766-2999
FAX: 931-766-3974
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