Re: Single-bushing 14.7kV pigs. Thoughts?

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

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


Never tried X-ray cable.  Did you have a monitor "safety gap" to detect any
resonant rise?

Dr. Resonance

Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo   WI   53913
 >
 > While this may indeed pose a problem with true coaxial style cable, I know
 > from experience that this was not a problem with HV x-ray cable. I used
about
 > 18 ft. of x-ray cable for the transmission line between my pig and the
coil
 > and I never experinced the "Blumline effect" with this setup. Of course,
 > x-ray cable also has a carbon based simiconductor tape wrapped around the
 > thick rubber insulation between the the rubber insulation and the grounded
 > outer metal braiding and I'm thinking that this may be the key as to why
 > the Blumline effect is not noticed in this situation. Just guessing here,
 > though.
 >
 > David Rieben
 >
 > ----- Original Message -----
 > From: Tesla list <tesla-at-pupman-dot-com>
 > Date: Monday, February 9, 2004 9:01 am
 > Subject: Re: Single-bushing 14.7kV pigs.  Thoughts?
 >
 >  > Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>
 >  >
 >  >
 >  >>
 >  > I also want to share with the group something to never do:  On an
 >  > early pig
 >  > xmfr we used a coax cable to connect both the hot and ground
 >  > approx 12 feet
 >  > over to the coil.  When we fired the coil up the capacitance
 >  > formed a
 >  > powerful resonance with the xmfr's inductance.  The result was hot
 >  > longsparks that fired across the entire large 14.4 kV bushing on
 >  > the xmfr.  It
 >  > formed a sort of blumlein and developed over 125 kV across the
 >  > bushing!
 >  > Dr. Resonance
 >
 >
 >
 >