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*To*: tesla-at-pupman-dot-com*Subject*: RE: Ballast choke questions*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Wed, 09 May 2001 18:42:13 -0600*Resent-Date*: Wed, 9 May 2001 18:45:55 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <_MG_y.A.BrG.ATe-6-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "David Dean by way of Terry Fritz <twftesla-at-uswest-dot-net>" <deano-at-corridor-dot-net> Hi Here is some interesting reading on the subject. http://www.staff.ncl.ac.uk/r.e.burnett/parts2#ballast Richie has a nice ballast there. I am interested to see what you do and how it works. later deano > -----Original Message----- > From: Tesla list [mailto:tesla-at-pupman-dot-com] > Sent: Tuesday, May 08, 2001 11:50 PM > To: tesla-at-pupman-dot-com > Subject: Ballast choke questions > > > Original poster: "J. B. Weazle McCreath by way of Terry Fritz > <twftesla-at-uswest-dot-net>" <weazle-at-hurontel.on.ca> > > > Hello Coilers, > > I've spent the last two evenings disassembling a large transformer > that I acquired with the intent to rewind it as a ballast choke to > use with a 5 KVA pole pig I'm getting. > > The stack of E and I laminations measures 3.5 inches thick, with > external dimentions of 7 inches by 7.75 inches. The center most > leg, or the middle of the E measures 3.5 inches by 2.25 inches. > The two "windows" measure 5 inches by 1.5 inches. > > Now for the questions to you transformer and choke experts: > > 1) How much power should a core of that size be capable of? > > 2) When re-assembling the core, should the laminations be > put back interleaved as originally found, or should all > of the E's be put together facing the same way? > > 3) If all E's are aligned, should there be an insulator put > into the gap between the E's and the I's? > > 4) I'm going to put multiple taps on the choke windings for > selecting different currents. Should the first 79 turns > as per the table below go nearest to the core, or on the > outside of the windings? > > Quoted from a post by Bert Hickman: > > >The example below assumes a 250 turn ballast > >and a 10:1 current range in 10% increments. > > > > > > Multiplying Turns > > Factor: at Tap > > > > Nmax 1.00 250 Total number of turns (Max. L) > > N(90%) 0.95 237 > > N(80%) 0.89 224 > > N(70%) 0.84 209 > > N(60%) 0.77 194 > > N(50%) 0.71 177 > > N(40%) 0.63 158 > > N(30%) 0.55 137 > > N(20%) 0.45 112 > > N(10%) 0.32 79 > > > > Any and all comments are welcomed. I want to do this once and do > it right the first time. Thanks in advance. > > > 73, Weazle, VE3EAR/VE3WZL > > Listening: 147.030+ and 442.075+ > E-mail: weazle-at-hurontel.on.ca > or ve3ear-at-rac.ca > Web site: www.hurontel.on.ca/~weazle > > >

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