[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [TCML] MMC Caps



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
______________________________**_________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/**listinfo/tesla<http://www.pupman.com/mailman/listinfo/tesla>

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