Re: [TCML] How to Fix Damaged Secondary

[Amir Mojarradi <ln2guy42@xxxxxxx>]

Hi David, 


Thanks for the suggestion. I have re-coated with polyurethane and now have a total of 4 thick coats of polyurethane on the secondary winding. I am planning to retest and see if the problem continues. It's an interesting effect to have the inner coats stay liquid and ooze when it breaks out. On my coil, the wires aren't melted, but rather there is a single point on a single turn that has arced and burned, possibly due to a thin layer of coating at that point.


Thanks, 


Amir Mojarradi 



-----Original Message-----
From: Harold Weiss <hweiss@xxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Wed, Oct 26, 2011 5:25 am
Subject: Re: [TCML] How to Fix Damaged Secondary


Hi Amir,

What kind of varnish did you use?

With my older coils, I used polyurathane, coating every 3 hours till the 
coil was smooth.  The inner coats stayed somewhat liquid for years.  Having 
a breakdown, the coil would ooze a bit, and recover the damage, with very 
few problems afterwards.  As long as the wires aren't melted together, a 
little clean up, and recoating  may be all you need.

Worse case, you may have to cut a few turns out and splice.

You may want to also reduce coupling.

David Weiss



When testing at about 5 Kw, I noticed some arcing one individual turn at 
exactly one point about 12" on the secondary. Upon examination, there is a 
small burn mark at the point on the turn where it was arcing. At this point 
on the wire, the varnish is melted and has left the point exposed. I have 
re-varnished the entire coil already. Is there anything I can do to "heal" 
the damaged point to prevent further arcing? I was originally planning to 
step up the power to about 12 Kw, but I might have to hold off, or possibly 
reduce coupling. Any suggestions or advice would be much appreciated.


Thank you for your kindness,


Amir Mojarradi
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla 

_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla

 
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla