Common mode voltage

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

Original poster: "Steve K by way of Terry Fritz <teslalist-at-qwest-dot-net>" <teslainnovations-at-yahoo-dot-com>

I am not very advanced with electrical terms and
such... I was just wondering what "common mode
voltage" means.

Steve


--- Tesla list <tesla-at-pupman-dot-com> wrote:
 > Original poster: "Lau, Gary by way of Terry Fritz
 > <teslalist-at-qwest-dot-net>" <Gary.Lau-at-hp-dot-com>
 >
 > I'm not sure that a primary strike (or any number of
 > them) poses any threat
 > to the tank cap.  If your tank cap starts out
 > charged to 20kV, transfers
 > that energy to the secondary, and then following a
 > strike manages to
 > achieve some higher voltage across the tank cap,
 > then you've _created_
 > energy in the process, clearly impossible, a
 > violation of conservation of
 > energy.
 >
 > A greater hazard from primary strikes is common-mode
 > voltage applied to the
 > NST secondary.  This is why safety gaps and bypass
 > caps to ground in an NST
 > protection network are recommended.  And even with
 > these measures,
 > common-mode noise transmitted through the NST to the
 > mains is likely, and
 > this is why EMI line filters are recommended.
 >
 > Regards, Gary Lau
 > MA, USA
 >
 >
 >  >Original poster: "Dr. Resonance by way of Terry
 > Fritz
 > <teslalist-at-qwest-dot-net>" <resonance-at-jvlnet-dot-com>
 >  >
 >  >Any time you connect 400-500 kV to a primary coil
 > that is directly
 >  >connected to a capacitor bank it puts excessive
 > stress on the caps.  It's
 >  >sort of like the "final straw that broke the
 > camel's back".  It may not
 >  >kill them immediately but it's definitely not a
 > good idea to allow this to
 >  >continue unabated.
 >  >
 >  >Support 3-4 small round brass cabinet knobs on 1/2
 > in. dia. x 3 in high
 >  >Delrin posts at the outermost edge of the upper
 > subbase assembly.  We run
 >  >the ground wire connection inside the Delrin
 > support post.  Each is
 >  >connected to ground and provide a rapid attachment
 > point for stray streamers.
 >  >
 >  >Dr. Resonance
 >
 >


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