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*To*: tesla-at-pupman-dot-com*Subject*: Transformer Design*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Mon, 13 May 2002 20:39:18 -0600*Resent-Date*: Mon, 13 May 2002 20:43:09 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <L9jj6D.A.zAE.6mH48-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "Ben McMillen by way of Terry Fritz <twftesla-at-qwest-dot-net>" <spoonman534-at-yahoo-dot-com> Hello all, Yesterday evening I took some time to begin the design of a new power supply for TC work. I'm planning on using the core from an old power transformer that was being thrown out. It's a 3 phase tranny rated at 240/260/280V input 3 phase. Output is 17 -at- roughly 280 amps. The name plate is marked 4.8KVA. I went to this site for design information: http://members.tripod-dot-com/~schematics/xform/xformer10.htm After working through some of the numbers, I got rather confused working out the VA ratings of the core. Accordint to the chart given on the webpage, for a core area of 6in^2, I should get a VA of about 900VA. Since there were three secondaries and primaries, I multipy that by 3 to come up with 2.7KVA. So where does the 4.8KVA marked on the name plate come from? If I divide that by 3 I come up with 1.6KVA per core. Is something different for 3 phase? How does core area relate (in mathematical terms) to VA ratings? Could someone direct me to a webpage with appropriate formulas? I want to do this by the numbers.. The core of this beast measures 9 1/2 inches by 11 inches and weighs about 80lbs.(quite hefty) Each leg has a core area of 6 in^2. I was hoping to wind the primary for 120/240V operation and place it on the center leg. The secondaries will each be 7.2KV (on the outer 2 legs of the E core) (center grounded to core) for a total of 14.4KV. Does anyone see a problem with this? How would I go about configuring the primary for 120/240V operation? (in the US) Thanks for any help! I'm hoping to use this PS with an 8" coil ;) Coiling In Pittsburgh Ben McMillen __________________________________________________ Do You Yahoo!? LAUNCH - Your Yahoo! Music Experience http://launch.yahoo-dot-com

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