RE: MMC wiring, bring it on

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Chris Roberts by way of Terry Fritz <teslalist-at-qwest-dot-net>" <quezacotl_14000000000000-at-yahoo-dot-com>


Ok - I just re-wired the whole primary circut, and I think losses should be 
cut back significantly. The entire primary circut is wired using 8 gauge 
wire, no little plastic clip-things, the wires are all twisted together 
using those old twist connectors. (The size of the connectors for 8 gauge 
wire is insane) The two end leads on both sides of the MMC are going to be 
connected to a common 8 gauge wire, which is then connected to whatever 
part of the circut. The wires leading up to the primary is 6 gauge. (I 
figured I'd want as little loss as possible there) Somewhere out there, 
there is a massive voltage surge just looking for me, and I have but one 
message for it: I'm ready for ya! =D

  Tesla list <tesla-at-pupman-dot-com> wrote:
Original poster: "Terry Fritz"

Hi,

Thick heavy primary wire helps reduce losses and heating in the wire.

If we have say a 5 joule primary cap and a 1 ohm wire with 500 amps for
10us... 1/2 of the energy would go into just heating the wire. So thick
low resistance wire really helps reduce losses and heating of the wire.

2 x 12 gauge strands of solid copper house type wire is probably the
minimum I would use but try to keep the lengths short.

MMC caps do have thin wires on them but the total distance is very short
and they are in parallel. Also, with heavy buss bars you can use heavy
bolts and such for connections and avoid the connector problems like Chris had.

For an excellent write up on this, see:

http://www.laushaus-dot-com/tesla/primary_resistance.htm

Cheers,

Terry

At 11:24 PM 2! /26/2003 +0000, you wrote:
 >At 10:57 25/02/03 -0700, you wrote:
 >>Original poster: "Mccauley, Daniel H by way of Terry Fritz
 >>"
 >>
 >>
 >>Chris,
 >>
 >>I see lots of people using some VERY serious bus-bar type connections at the
 >>ends of their MMCs and a lot of people
 >>will swear by this. And it does look very nice and professional, however
 >>if you look at your MMC, any single series
 >>connection between the capacitors is only by the capacitor lead itself which
 >>is such a small conductor in comparison.
 >>Its kind of like having an onramp to a major highway with 50 lanes and then
 >>the highway itself is only 2 lanes.
 >
 >I thought the idea was to minimize skin-effect resistance and inductance
 >in the bus-bars so that current would share equally between the MMC
 >strings. ! Otherwise the strings at the far end of the busbars (buswires
 >whatever) would get less current than the ones at the near end. I used
 >copper-clad PCB material for mine.
 >
 >Steve C.
 >



-Chris