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Registered Member #1745
Joined: Wed Oct 08 2008, 12:29AM
Location: Northen Michigan, US
Posts: 19
How many coats of varnish should there be on the secondary coil to prevent this? Im using a 450W transformer so you know how much power Im using. Thanks!
Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
Those are racing arcs. Usually to much coupling causes that or to little varnish. How many coats of varnish is on the coil and how long is it between the uppermost primary turn and the lowest secondary turn? Also how far apart is the primary spaced from the secondary. Those measurements can determine the coupling but generally you want it around 0.13
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Crimson Rain wrote ...
Yeah, theres a toroid on top. 3"x12" And theres also arcing along the secondary as well, which I know is bad >_<
You need to change coupling then. Coupling will fix it all. Just raise or lower the secondary to get the primary to be at the right level. Just a small change will change alot. Just use something quite thin and raise or lower until you get best performance.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
It is in my experience that coatings will not stop these sparks, but will help protect your coil when they do occur. I really like using layers of epoxy coating (envirotex, ultra-glow, or even your typical 5 minute epoxy for little coils) that are so thick that the spark current tends to spread out over the surface and dissipate any localized heating that would cause the coating to fail. Thin varnish coatings seem to punch right through damaging the winding. But coatings are not the cure for the problem! As mentioned before, raise your secondary up some...
Other good fixes include making your primary have less sharp points. You can do this by placing a sheet of thick plastic (1/4" works well) over the primary. The plastic, having a higher dielectric constant, serves to spread out the e-field around the primary so that the primary looks more like a smooth flat surface, and this tends to keep corona from forming. This has worked wonders in many cases, but ive also seen this fail when condensation built up on the plastic.
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Arcing from secondary to strike rail
