Re: secondary question

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

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


You can run the ground out through the bottom of the sec, but always keep
the top last sec windings outside of the coilform -- don't run them inside.
Use a long plastic bolt to suspend your HV terminal.  Connect your last turn
to the terminal --- keep it outside of the coil.

Spacewind the last 5 turns to slowly reduce the distributed capacitance on
the top of the coil.

Also, insert an acrylic disk inside the sec coil approx 4-5 inches up from
the bottom and a second disk 3-4 inches down from the top of the sec
coilform.  Especially with small magnet wire sec coils that are highly
stressed.

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, March 08, 2004 8:54 PM
Subject: RE: secondary question


 > Original poster: "Malcolm Watts" <m.j.watts-at-massey.ac.nz>
 >
 > On 8 Mar 2004, at 7:44, Tesla list wrote:
 >
 >  > Original poster: "Steve Conner" <steve.conner-at-optosci-dot-com>
 >  >
 >  >  >Long streamers are the
 >  >  >result of repetitive growth along a hot and possibly partially
 >  >  >ionized channel of air.
 >  >
 >  > OK, then why doesn't that hot and partialy ionized channel of air form
 >  > down the middle of the secondary? :)
 >  >
 >  > Steve C.
 >
 > It can if you let it. Capping the secondary coil is one way of
 > preventing it from happening. Having the relative creepage distance
 > between the ends of the coil higher inside the former than outside is
 > another. Allowing the highest electric field stress to form away from
 > the former is one way of preventing it. I have made uncapped
 > secondaries flashover internally by running them at a high enough
 > voltage to allow it. The job is made easier by drilling a couple of
 > holes in the form at the top and bottom and threading the wire in and
 > out to hold the ends fast. Perhaps one of the modelling programs can
 > be extended to show the internal vs external stresses under these
 > conditions. The point is, it will happen if you make it happen. If
 > you don't believe me, run your coil single shot and increase the
 > primary energy until a flashover does occur.
 >
 > Malcolm
 >
 >
 >