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Re: MOT info



Original poster: "Hydrogen18" <hydrogen18@xxxxxxxxxxxxx>

I agree with Mike definetly here, inductive ballasts are simply the best. As
for a 6 or 8 pack, I think you will need to disconnect the HV from the core
and put it under oil for sure.

Eric
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, December 22, 2004 2:22 PM
Subject: Re: MOT info


> Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx> > > I wouldn't worry about the difference cost wise between 30A and 60A draw. > Assuming you run it for an hour a day at ~14 kW (plenty enough to > annoy/scare the neighbors/police/swat team) over a month that's $84 vs. $42 > for ~7kW. I seriously doubt you'll actually run it that much before spark > gaps need replaced, ears need a rest, etc. I think it's always easier to > use inductive ballasting and cheaper. With caps you'd need lots of them in > parallel to handle the 30-60A and you'd need lots of uF (about 100uF for > around 25A limiting off the top of my head). I haven't actually tried this > myself, but seems like the caps would heat up like resistive ballasting. I > personnly would just use the hardware store ballast, (2) 500' rolls of > 10-12 awg for 26A limiting. > > Mike > ----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx> > To: <tesla@xxxxxxxxxx> > Sent: Wednesday, December 22, 2004 1:55 PM > Subject: Re: MOT info > > > >Original poster: Rich Simpson <richcreations@xxxxxxxxx> > > > >[sorry if this shows up twice, I used the wrong email account] > > > >I have seen the circuit that uses two mots wired back to back, then a > >center taped mot stack, and I have seen the circuit that grounds the > >"center" mots, and disconnects HV lines from the cores on the outer ones. > >and I have seen greg's 4 mot stack that uses caps for ballast. as well as > >various variations > > > >which of these seems to be the best, for a 6 or 8 mot stack? > > > >what about ballasting, I would rather not pull 50amps, 20-30amps would be > >ok (I have a 240v/60a circuit to use, but at $0.20 per kw, I would like to > >limit the current draw. should I use caps as greg has done, or should I > >wind an inductor around some rebar or welding rods? > > > >-Rich > > > >On Dec 21, 2004, at 11:12 AM, Tesla list wrote: > > > >>Original poster: "Christoph Bohr" <cb@xxxxxxxxxxxxxxx> > >> > >>Hello Rich. > >> > >>I have build a 4 and a 6-MOT stack in the past and both > >>performed pretty well in respect to power handling capability. > >> > >>I have the MOT's under transformer oil which keeps them cold and > >>aids isolation. Though I did not disconnect the cores from the inner end of > >>the > >>secondary winding I had no problems with arcovers during normal operation. > >>I experienced a primary to core flashover in one of the outer MOT's once, > >>but this was after exessive voltage rise while not using a safety gap, or in > >>other words > >>this was my own fault. > >> > >>I did not remove the shunts but always wondered if I had better done that. > >>Maybe anyone else can advise on this. > >>Howerever, these things are powerfull and cheap to build, but can be a pita > >>to > >>carry around, but a pole-pig isn't a lightweight neither. > >> > >>regards > >> > >>Christoph > > > > > > > > >