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Re: Phasing of multiple T

 -=> Quoting Tesla-at-grendel.objinc-dot-com to Tesla List <=-

 Te> Date: Wed, 13 Sep 95 11:10:58 EDT
 Te> From: "I am the NRA." <pierson-at-msd26.enet.dec-dot-com>
 Te> To: mail11:;-at-msd26.enet.dec-dot-com (-at-teslatech)
 Te> Cc: pierson-at-msd26.enet.dec-dot-com
 Te> Subject: Phasing of multiple Transformers


 Te> Possibly Silly Suggestion:

 Te> On coils using multiple power transformers, especially during initial
 Te> debugging,
 Te> would it be desirable to have each output fused separately?

 Te> Any connected out of phase should blow fuse(s), indicating clearly
 Te> that Something Was Rong.

 Te> This may be a dumb idea:

 Te> 1) HV fuses are hard to come by...
 Te> 2) Low current fuses are hard to come by...

 Te> In more detail:
 Te> 1) typical fuses are designed to interupt 110VAC, NOT 15KV & up.
 Te> BUT.
 Te> A bare fuse (I am thinking glass, tubular, not "edison (8)>>) base")
 Te> with wires on it for temporary use might do.  Or simply a bit of VERY
 Te> fine wire.  Either mounted so as to not dreate a hazard when it
 Te> blows. 
 Te> 2) Low current fuses, as little over the rating as possible, as neon
 Te> sign transformers (especially) will self protect. [1]  Maybe from
 Te> finest wire?

 Te> Or does the self protection make such coomplexity as addded fuses
 Te> redundundat? Even if the neon sign transformer is not damaged, a blown
 Te> fuse would indicate a
 Te> phasing problem _quick_.  My guess (comments???) is that at least with
 Te> neon sign transformers, the self protecting design would make it
 Te> useless to fuse the _primary_.

 Te> regards
 Te> dwp

  MG> If I understand your question right, it would be a waste of time.
  MG> If the transformers are out of phase there is no current flow due to
  MG> cancellation in the windings and core, so the fuse would do nothing.

... Alias, Mark the spark
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