40 mil LDPE and 5kv Transformers?
From: Steve Falco [SMTP:sfalco-at-worldnet.att-dot-net]
Sent: Tuesday, April 07, 1998 5:55 PM
Subject: 40 mil LDPE and 5kv Transformers?
I am building some capacitors using .040" LDPE. I was originally
planning on building two units and putting them in series to get an
adequate voltage rating.
But now I find that the H&R trannies I am using really only put out half
the voltage they are spec'd for, i.e. really 2.5 kv each (without
resonating caps), rather than 5 kv (with resonating caps). So, I am
wondering if a single layer of .040" LDPE will hold with two trannies in
series (5 kv total voltage applied). This would let me use 1/4 the
amount of plastic, which is worth considering.
If I assume 400 volts per mil of LDPE, then 0.040 * 400 = 16 kv which is
slightly more than 3 times the applied 5 kv. So, there would appear to
be a reasonable safety factor, even allowing for peak voltage.
Any opinions out there? Will one layer take it or should I go for
multiple series caps?