Hi Ruben,
Welcome to the wonderful world of opinions! "Safe" is not a binary
concept. it is a continuum of "greys". When MMCCalc says your plan is very good,
that is correct. When Javatc says 60kV is probably optimal, that is also
correct. In MY opinion, you are OK with your design, which has about a 50% safety
margin. More would not be "safe", but would be safER. Consider the following:
1) You are driving at 50 MPH and see a stopped car ahead. While there are
tables showing road/tire conditions and stopping distances, the real question
is "at what distance would YOU start braking"?
2) You are sky-diving. Tables notwithstanding, at what altitude would YOU be
comfortable opening your 'chute?
Obviously, with a TC only a few caps will go "splat" if you're wrong, but
the same principle applies. If knowing the odds gave you absolute answers,
there would be no horse races.
Matt D.
In a message dated 1/3/08 5:18:41 A.M. Eastern Standard Time,
ruben.peterstc@xxxxxxxxx writes:
Hello all,
I'm just about to order capacitors for my MMC
Arcotronics RS-114-474 1500 0.047, from
http://www.rsaustralia.com <http://www.rsaustralia.com/> .
So far I'm planning 4 strings of 17 caps to give a rating of 11.06nf ,
25.5kv DC (running on a 12/30 NST, LTR with a static gap).
Terry's MMCcalc, rates 25.5kv as very good, while Java TC designer
recommends a peak voltage of 60kv.
I've read some places that a voltage just over the peak transformer voltage
is sufficient; other places that 1.8*peak is necessary; in addition to the
fact that dielectric strength reduces with frequency (my coil will run at
about 429khz)
So I'm wondering if there is any consensus about the recommended MMC voltage
rating, as well, Im after as any opinions and recommendations. I'd Rather
the MMC cost $120 as opposed to $180++, but at the same time I don't want to
blow caps (blowing cash I don't have)
Many thanks
Ruben
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