Re: Single-bushing 14.7kV pigs. Thoughts?

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

Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com> 


We only use pole xmfrs for large coils ---  the 10-15 ft long sec spark will
get you a long time before you get near the primary.  In short, you'll
already be on fire before you get near the base of the coil

We put the HV power supply in a sealed separate box and use 125 kV "big red"
jumper cable to connect to the base of the oscillator.

Dr. Resonance

Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo   WI   53913
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, February 09, 2004 9:03 AM
Subject: RE: Single-bushing 14.7kV pigs. Thoughts?


 > 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
 >
 >
 >