Re: [TCML] MMC Caps

[Dave Leddon <dave@xxxxxxxxxx>]

Man, that's one large tank cap.  You could use a bunch of snubber 
caps like these:
http://www.ebay.com/itm/Lot-Of-10-Aerovox-IGBT-Snubber-Capacitors-RBPS-2-0uF-k-1000-Vdc-/200916582574?pt=LH_DefaultDomain_0&hash=item2ec78fc0ae
I've had good results using an array of 8 strings of 9 for a total 
measured capacitance of 2 uF at 9000 volts for a large DRSSTC.
Dave

At 05:52 PM 10/18/2013, you wrote:
> 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
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla

_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla