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Re: LDPE Caps for 15kv Transformer
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To: tesla@grendel.objinc.com, KLINEDA@univscvm.csd.scarolina.edu, QUANTUM@univscvm.csd.scarolina.edu, WMEYER@scientia.up.ac.za, bhaley@shore.net, frerichs@zfe.siemens.de, froula@cig.mot.com, haba@snakemail.hut.fi, jetter@ix.netcom.com, scott@csustan.csustan.edu
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Subject: Re: LDPE Caps for 15kv Transformer
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From: Esondrmn@aol.com
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Date: Thu, 5 Oct 1995 16:49:59 -0400
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In a message dated 95-10-05 13:28:27 EDT, tesla@grendel.objinc.com writes:
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>Hi Coilers,
>
>Anybody know if 120mills ( 3mm ) of low-density polyethelene wil be
>sufficient dielectric thickness for
>a 15kv system?
>Ive never made a rolled poly cap before, but want to get it right the first
>time, as the LDPE sheet sure
>aint' cheap ! Ime using a hospital-grade material, as the stuff at the
>hardware seemed pretty poor quality.
>It was speckled with little grains of 'crap' (????) embedded in it. (just
>asking for trouble! )
>
>My new Magnifier system will employ the series 'equidrive' system. The pair
>of series caps will use
>60mills each. I can increase the voltage on the transformer to around 17kv
>with the variacs' overwind.
>Do you think they can handle it ? Should I change the variac tap to limit
>voltage to 15kv?
>I want these suckers to be 'bulletproof' ! :)
>I was told that LDPE can take 500V per 1/1000 inch. Does that sound right?
>
>Marcus
Marcus,
Based on my experience (and I have ruined two of these) one capacitor made
with .062 poly is good for 8 to 9 kv and no more. A rating of 8kv should be
safe. This means two in series should be bullet proof at 15kv. 17kv, I
don't know. This is getting close.
Gaps set a little too wide and kickbacks cause very high voltage pulses in
the tank circuit.
Ed Sonderman