Re: [TCML] Primary Capacitors ... Again ...

[mddeming@xxxxxxx]

Hi Jim,

When calculating the voltage-reversal pps for life expectancy, should one use  2X the line frequency or the TC operating frequency ~100KHz? With a SGTC, I can see maybe using the line frequency because the RF oscillations are damped rather severely and are occuring in "bursts" of ~120 bps, but it still seems that these high frequency reversals are having SOME effect on the cap, and therefore the higher Fo of the coil, the lower the life expectancy would be. No?


The other problem with the "slightly used" Maxwells many coilers get, is that unlike used cars, they don't come with an "odometer" reading, you never know just how "used" they are.

Matt D



-----Original Message-----
From: jimlux <jimlux@xxxxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Wed, Apr 14, 2010 9:25 am
Subject: Re: [TCML] Primary Capacitors ... Again ...


Thomas Schmit wrote: 
> Ok - so what is the general opinion of the following for the primary capacitor of a pig powered coil? 
> > http://theelectrostore.com/datasheets/pulse_maxwell_specs.jpg 
> > They are low inductance, high voltage, high current energy discharge caps but they are only rated for 500 pps, which seems to be typical of these type of caps... how will they perform at high frequency? 
> >  
You can derate them for TC duty.. high voltage reversal. Most tesla coils *are* only a few hundred PPS (e.g. line frequency *2) 
 
http://home.earthlink.net/~jimlux/hv/caplife.htm discusses life scaling. 
 
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