Re: [TCML] MMC Caps

["Carl" <cn8@xxxxxxx>]

Has anyone tried using a series string of motor run caps?  They are rated 
for many amps AC and are typically 370 VAC.  Not necessarily built for low 
L, however.

---Carl




-----Original Message----- 
From: lightningfor@xxxxxxxxxxxxxxxxxxxxxx
Sent: Friday, October 18, 2013 5:52 PM
To: Tesla Coil Mailing List
Subject: [TCML] MMC Caps

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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