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Re: [TCML] surge arrestor for pole pig
In a message dated 9/17/08 2:51:11 P.M. Eastern Daylight Time,
jcalvin@xxxxxxxxxxxxxxx writes:
>I am looking to purchase two of these to protect my pole pig (25KVA
>14400VAC). Would two of these in series work as a 30KV surge arrestor?
Sure, but why do you need a 30kV arrestor for a 14.4kV pig?
>Figuring peak output of my pole pig is aprox. 20KV.
Pretty close (20.36kV), assuming rated low voltage in (no variac,
correct voltage, etc.).
> Could this protect mypole pig from arcs from the secondary back to the
primary? This happens
>only rarely but has happened.
I don't think secondary strikes to the primary are in and of themselves
of so much concern as the transients at the spark gap.
I had problems with transients on the "safety" ground when running my
ASRG (my grounded control cabinet arced to *me*, despite a floating pig primary
and secondary!). The Terry Filter fixed this completely
-Phil LaBudde
Center for the Advanced Study of Ballistic Improbabilities
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