Paralleling dissimilar NST's

• To: tesla-at-pupman-dot-com
• Subject: Paralleling dissimilar NST's
• From: "Lau, Gary" <Gary.Lau-at-compaq-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Thu, 10 Feb 2000 18:23:11 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

I'm not sure I agree that paralleling slightly dissimilar Vout transformers
will result in losses due to "fighting".  Consider this thought experiment.
Take the two 14.5 and 15.5 KV 30mA NSTs and wire them in parallel, observing
correct phasing.  Apply an AC milliampmeter across the outputs, essentially
shorting them.  Since Vout is now essentially zero, their open-circuit Vout
difference is no longer significant, but yet their short circuit currents
would combine to yield 60mA.  Open circuit, their voltages should average
out to 15.0KV,assuming similar winding resistance.

Gary Lau
Waltham, MA USA

>Original Poster: "Reinhard Walter Buchner" <rw.buchner-at-verbund-dot-net> 
>
>For coiling work (matching the primary cap), it is important
>to know what current your array of NSTs will deliver. As
>pointed out, a 15kV xformer may only deliver 14.5kV (and
>a sign; i.e: in normal usage; doesn´t care). If you parallel
>a fictive 14.5kV/30mA xformer to another (fictive) 15.5kV/
>30mA xformer, your resulting output will neither be 15kV
>nor will you achieve 60mA, simply because the NSTs will
>be *fighting* each other. As they are current limited, they
>will not be harmed, but you will loose some power in this
>process.

• Prev: Tube coil ideas using 600W tetrodes?
• Next: RE: Stacking Variacs - shaft material
• Index(es):
  • Main
  • Thread