Re: [TCML] MMC Caps

["Carl" <cn8@xxxxxxx>]

Hi---

I've never tried using them for a TC.  They're available in Grainger.  The 
run forever at the current rating on a 220V motor.  I've never built a SSTC, 
but these caps might be interesting to check into.

---Carlos





-----Original Message----- 
From: Mark X2
Sent: Saturday, October 19, 2013 1:21 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] MMC Caps

Hi Carlos,

20uF, that's quite impressive.
How big of a coil are we talking about, just curious?

Why the 940C instead of the 942C? The 942C has better specs, considering
ESR, dV/dT and max. current.

The manufacturer's voltage ratings are very conservative and you're using
DC, won't be much of a problem then.

Regards,
Mark





2013/10/19 <lightningfor@xxxxxxxxxxxxxxxxxxxxxx>

> Hi,
> I am building a large OLTC with about a 20uF capacitor.
> I want to run about 1200vDC so I can make use of the 3ph power I have
> available.
>
> I will be using the familiar 940C style of cornel Dublier capacitors all
> paralleled up to give me the 20uF, but I remember Steve HV recently saying
> that caps do breakdown after some hours of use if run beyond the AC
> rating...
>
> The problem is that when we serries them up to increae the voltage rating,
> it means we need LOTS of caps so more $$$$...
>
> The common cap is 940C20P47K-F, 0.47uF 2000v DC, 550vAC rated... (so I
> need about 170 caps in serries/parrallel)
> But there is also a 940C30P15K-F, 0.15uF 3000v DC, but the AC rating is
> still 550vAC...? (so I need about 130 in parallel.)
>
> Do you think I can RELIABLY run 1200v DC into the 3000v DC caps, or should
> I just bite the bullet and pay the dollars to serries/parrallel the larger
> 2000v DC caps?
>
> Thanks,
>
> Carlos
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