Re: [TCML] surge arrestor for pole pig

["David Rieben" <drieben@xxxxxxxxxxx>]

Hi Jim,

I originally had a single 18 kV rated arrestor on my big coil.
On one occasion, I was firing the coil outdoors on a windy day
and the wind actually "blew" some of the streamers/sparks
back into the lower third of the secondary coil and into the primary
circuit. The output almost immediately died and further inves-
tigation revealed that the arrestor had failed as a short circuit.
However, nothing else in the system died so I guess the arrestor
did its job by sacrificing itself to protect the transformer and the
capacitor. I eventually replaced the 18 kV arrestor with a 36
kV arrestor, which would be in the same "ballpark" rating as
your proposed (2) seriesed 15 kV arrestors since my transformer
is also rated at 14,400 volts on the high voltage side. I haven't had
anymore problems since I added the 36 kV arrestor but then
again, I have also since tried to avoid firing the coil during
excessively windy conditions, too. BTW, my arrestor is one
of the more modern butyl rubber exterior types instead of the
porcelain exterior type. It's much lighter and less fragile, too.
The exterior is the only difference though and the older por-
celain style ones will work just as well.

David


----- Original Message ----- 
From: "Jim Calvin" <jcalvin@xxxxxxxxxxxxxxx>
To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
Sent: Wednesday, September 17, 2008 12:56 PM
Subject: [TCML] surge arrestor for pole pig


> 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?
> Figuring peak output of my pole pig is aprox. 20KV. Could this protect my
> pole pig from arcs from the secondary back to the primary?  This happens
> only rarely but has happened.
>
>
>
> http://cgi.ebay.com/MCGRAW-EDISON-15KV-DISTRIBUTION-LIGHTNING-ARRESTOR_W0QQi
> temZ180285461245QQcmdZViewItem?hash=item180285461245
> <http://cgi.ebay.com/MCGRAW-EDISON-15KV-DISTRIBUTION-LIGHTNING-ARRESTOR_W0QQ
> itemZ180285461245QQcmdZViewItem?hash=item180285461245&_trkparms=72%3A1205%7C
> 39%3A1%7C66%3A2%7C65%3A12%7C240%3A1318&_trksid=p3286.c0.m14>
> &_trkparms=72%3A1205%7C39%3A1%7C66%3A2%7C65%3A12%7C240%3A1318&_trksid=p3286.
> c0.m14
>
>
>
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