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1. [Amps] Transformer heating (problem?) (score: 1): Author: "David Craig" <davidhcraig@verizon.net>; Date: Wed, 11 Feb 2009 23:37:35 -0500; Corollary to a previous issue with a B+ transformer I passed thru the group a while back, which before I repaired it had a current loop due to bad/no insulation on the core bolts. Transformer has a 2; /archives//html/Amps/2009-02/msg00347.html (8,969 bytes)
2. Re: [Amps] Transformer heating (problem?) (score: 1): Author: "Gary Smith" <Gary@doctorgary.net>; Date: Wed, 11 Feb 2009 23:46:31 -0500; I'm sure no expert, any chance the Iron's not built for 60Hz? Gary KA1J _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listi; /archives//html/Amps/2009-02/msg00349.html (9,645 bytes)
3. Re: [Amps] Transformer heating (problem?) (score: 1): Author: "David Craig" <davidhcraig@verizon.net>; Date: Wed, 11 Feb 2009 23:53:53 -0500; Hi Gary, no, positive it is for 60Hz _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2009-02/msg00350.html (9,977 bytes)
4. Re: [Amps] Transformer heating (problem?) (score: 1): Author: "Jim W7RY" <w7ry@arrl.net>; Date: Wed, 11 Feb 2009 21:18:24 -0800; What is this transformer's history? Where did it come from? What was it used for? Some sort of intermittent duty type of device like an industrial welder or similar? Is it really 240 volt primary? Ho; /archives//html/Amps/2009-02/msg00351.html (10,756 bytes)
5. Re: [Amps] Transformer heating (problem?) (score: 1): Author: "David Craig" <davidhcraig@verizon.net>; Date: Thu, 12 Feb 2009 00:47:42 -0500; Hi Jim, Purchased it from WA1JOF about 2 years ago when I started this projectI can't recall if he ever used it, though I doubt it given the severe current loop problem it had when I powered it up th; /archives//html/Amps/2009-02/msg00352.html (12,148 bytes)
6. Re: [Amps] Transformer heating (problem?) (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Thu, 12 Feb 2009 01:38:58 -0500; My question would be: has the transformer ever been fully disassembled? To me the original problem would have indicated this might be a strong possibility. I'm assuming this is the standard "E" frame; /archives//html/Amps/2009-02/msg00353.html (10,728 bytes)
7. Re: [Amps] Transformer heating (problem?) (score: 1): Author: "David Craig" <davidhcraig@verizon.net>; Date: Thu, 12 Feb 2009 02:07:19 -0500; It may well have been Roger- I can't tell for sure. One thing that bothered me a LOT was that when redoing the E I core lamination thru bolts, some of the plates were not aligned properly- I had to g; /archives//html/Amps/2009-02/msg00355.html (12,715 bytes)
8. Re: [Amps] Transformer heating (problem?) (score: 1): Author: Angel Vilaseca <avilaseca@bluewin.ch>; Date: Thu, 12 Feb 2009 08:32:39 +0100; I observed the same phenomenon with microwave oven transformers. The core gets very hot when power is applied to the primary even for a few minutes, even with no load on the secondary. This is becaus; /archives//html/Amps/2009-02/msg00356.html (10,567 bytes)
9. Re: [Amps] Transformer heating (problem?) (score: 1): Author: "Paul Kraemer" <elespe@lisco.com>; Date: Thu, 12 Feb 2009 08:44:16 -0600; David Have been watching this thread, looking for an answer and am throwing this theory out for consideration. Sometimes with motors they can actually draw more current running un-loaded than under f; /archives//html/Amps/2009-02/msg00358.html (11,192 bytes)
10. Re: [Amps] Transformer heating (problem?) (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 12 Feb 2009 08:42:19 -0500; A Variac would be a big help here. Then place a 100W bulb across the secondary with an AC ampmeter. Also use a meter in a 240V leg. Then crank up the voltage until the bulb has about normal brillianc; /archives//html/Amps/2009-02/msg00365.html (15,478 bytes)
11. Re: [Amps] Transformer heating (problem?) (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 12 Feb 2009 12:44:41 -0500; If you ran a drill thru the bolt holes you probably created a short from plate to plate in doing so. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.co; /archives//html/Amps/2009-02/msg00370.html (14,511 bytes)
12. Re: [Amps] Transformer heating (problem?) (score: 1): Author: "David Craig" <davidhcraig@verizon.net>; Date: Sat, 14 Feb 2009 03:04:38 -0500; Did a lot of research/ talking on this one, so I posit this; Hypersil cores are pre-formed and "bandsawed" in half prior to assembly, which is done with band-clamps. In sum the core HAS to be shorted; /archives//html/Amps/2009-02/msg00443.html (16,401 bytes)

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