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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
I am getting ready for my biggest HV transformer trick yet. I may sell them here on the forum.
I'm using 3D printed bobbins of the pie type with a semi-auto winder with counter: - #38 wire double insulated coat - Copper foil primary - large cross-section ferrite from TSC (TSF-50ALL) - Vacuum degassed and filled epoxy or oil - Kapton, epoxy and "fish" paper insulation to core and insulation to primary. - Femm field analysis for reliability.
Ill fully evaluate them using my high voltage probes across frequency and voltage.
But I don't think epoxy sticks to Kapton, if it Doesn't then it will peel and that void will fill with air and turn to corona. So I thought to use electrical paper which under vacuum oil or epoxy can penetrate through capillary action, Ive seen the dielectric tables but never used it.
Ive purchased some online but is there anything else i should know ?
Im about to use this ball spark gap to check the dielectric in samples before the actual transformers are made. In this way I can establish a average V/mil for my particular method/epoxy/paper insulator.
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Electrical Paper.
