From: "Sir Charles W. Shults III"
Subject: Re: NST for tesla coil question
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Sat, 11 Jan 2003 23:58:15 GMT
NNTP-Posting-Date: Sat, 11 Jan 2003 18:58:15 EST
Organization: RoadRunner - Central Florida
You will find that when building Tesla coils and other high voltage
equipment, you are better off using 5,000 to 7,500 neon transformers. Higher
voltages make it difficult to produce good capacitors, because insulators break
down so easily at these voltages. A lower voltage transformer makes it a simple
matter to make custom capacitors that will not break down or be as inefficient.
I learned this trying to apply 15 kilovolt transformers to Tesla coils in the
past. The losses are unacceptable.
Mylar plastic sheeting and heavy duty aluminum foil are excellent materials
for making your capacitors, as Mylar has an insulation breakdown voltage that is
difficult to surpass. A 250 micron thick sheet has a typical breakdown voltage
of 27.5 kilovolts.
Also keep one other thing in mind- DC and AC breakdown voltages can differ
substantially, due to many reasons. In a Tesla coil, the voltages are not
sinusoidal, so an AC voltage reading will not take peak voltages into account!
You must calculate 3 to 4 times the thickness you would expect for an equivalent
DC voltage to get the proper breakdown resistance.
Otherwise, the peak voltages will puncture the Mylar and you will get
lightning and thunder.
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip