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MOV lightning arrestor in place of safety gap...MCOV?
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- Subject: MOV lightning arrestor in place of safety gap...MCOV?
- From: "Tesla list" <tesla@xxxxxxxxxx>
- Date: Fri, 29 Apr 2005 07:44:23 -0600
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Original poster: "J. Aaron Holmes" <jaholmes@xxxxxxxxxxxxxxxxxx>
I recently picked up a baker's dozen of 3kV MOV
distribution lightning arrestors on eBay for little
more than a dollar each. Seemed like a steal; these
things are each the size of a soda can! Ok, on to
practical matters: How do I use them? My intent was
to use a few of these in series in place of (or in
addition to) a safety gap for protecting my 15kVA
14.7kV pig. Or as part of the world's largest Terry
Filter :D Trouble is, I can't decide how many to put
in series. Should I be going by the arrestor rating
(3kV), or the MCOV rating (2.55kV)? Or maybe neither?
I'm afraid I don't quite get why there have to be
multiple ratings on these things, but then I'm not a
power systems engineer. Those folks are a little
strange (no offense! :D) Maybe I should just put a
bunch of 'em across the output of my pig then rev the
variac up and down and keep removing arrestors until I
start seeing big currents on the input of the pig?
I've heard of a few people using these in place of
safety gaps, but I haven't seen a lot of details.
Seemed like an interesting project, though.