RE: Single-bushing 14.7kV pigs. Thoughts?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Paul Marshall" <klugmann-at-hotmail-dot-com> 

The only down side is that you have a 14.7kV potential to ground. On a two 
bushing pig, if you happen to contact one live bushing you'll live to tell 
the tale. On a single bushing pig accidental contact with that bushing and 
we will all be reading about you in the obituary column of the local 
newspaper...



Paul S. Marshall





>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Single-bushing 14.7kV pigs.  Thoughts?
>Date: Sun, 08 Feb 2004 08:50:28 -0700
>
>Original poster: "J. Aaron Holmes" <jaholmes-at-silicon-arcana-dot-com>
>
>After months of searching and drooling over
>hopelessly-expensive 5kVA units on eBay, I finally
>found a cheap local source for used pigs (in Seattle).
>  The price was $100 for a 14,760V 15kVA unit, the
>smallest unit they had.  I was so ecstatic, I bought
>two for twice the price :)  Never hurts to have a
>spare, after all.
>
>Trouble is, they're the single-bushing sort.
>
>Now, this may or may not be a big deal; I've been a
>long-time lurker on this list, but I've never gotten a
>good feeling for exactly what the downside is to
>having only a single HV bushing.  If I wire up the
>outer two bushings on the LV side and ground the case,
>can't I just treat the case like the other HV bushing?
>
>Sounds like most people with single-bushing units have
>the 7200V variety, so series-phasing them makes sense
>for several reasons.  I'm not sure what good it does
>me, though.
>
>If this has been dealt with a million times, feel free
>to scorch me.  I deserve it :)
>
>Regards,
>Aaron