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1. [Amps] HV transformer issue (score: 1): Author: "David H Craig" <n3db@radix.net>; Date: Sat, 3 May 2008 20:19:14 -0400; Hello all, I am seeking input on a potential problem with my "almost new" B+ transformer. It is a 240V input, output 4 taps from 2800-3000V rated 2 amp full load. Transformer was tested in situ today; /archives//html/Amps/2008-05/msg00016.html (9,604 bytes)
2. Re: [Amps] HV transformer issue (score: 1): Author: TexasRF@aol.com; Date: Sat, 3 May 2008 20:24:44 EDT; Are these through bolts supposed to be insulated? 73/gw In a message dated 5/3/2008 7:20:02 P.M. Central Daylight Time, n3db@radix.net writes: Hello all, I am seeking input on a potential problem wit; /archives//html/Amps/2008-05/msg00017.html (10,197 bytes)
3. Re: [Amps] HV transformer issue (score: 1): Author: "David H Craig" <n3db@radix.net>; Date: Sat, 3 May 2008 20:31:12 -0400; I assumed not since it was built as it is, but that said a dead SB220 HV transformer I pulled apart did indeed have insulated bolts. Should I try doing so, maybe with a teflon tube as opposed to pape; /archives//html/Amps/2008-05/msg00018.html (12,047 bytes)
4. Re: [Amps] HV transformer issue (score: 1): Author: "David H Craig" <n3db@radix.net>; Date: Sat, 3 May 2008 20:48:30 -0400; Thanks Dick, I can try that. As constructed the bolts are running thru the same piece of angle aluminum that mounts the transformer to the chassis. As for cap bank I am using six 2watt 220k metal fil; /archives//html/Amps/2008-05/msg00019.html (9,380 bytes)
5. Re: [Amps] HV transformer issue (score: 1): Author: TexasRF@aol.com; Date: Sat, 3 May 2008 21:26:24 EDT; I could be wrong about this but my recollection is that not only should the through bolts be insulated, but also the hardware at both ends as well. The idea is to prevent an accidental shorted turn t; /archives//html/Amps/2008-05/msg00020.html (13,238 bytes)
6. Re: [Amps] HV transformer issue (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Sun, 04 May 2008 02:09:50 +0000; Hi Dave, interesting problem, with those bolts! Firstly, I would not believe that they can get so hot from hysteresis losses. They are not really taking much magnetic flux at all, because they are se; /archives//html/Amps/2008-05/msg00022.html (9,266 bytes)
7. Re: [Amps] HV transformer issue (score: 1): Author: "David H Craig" <n3db@radix.net>; Date: Sat, 3 May 2008 22:58:07 -0400; Thanks much for the ideas gents. So far I tried the following: 1.) insulated the core from the chassis with a scrap 1/4" lexan sheet (no bolts just let it sit there) & powered it up with no cap bank; /archives//html/Amps/2008-05/msg00023.html (16,422 bytes)
8. Re: [Amps] HV transformer issue (score: 1): Author: "David H Craig" <n3db@radix.net>; Date: Sat, 3 May 2008 23:23:55 -0400; Thanks for the great info Manfred. I didn't get your email until after I sent my latest. I agree 1000%, I can't use it as it is. I think after a few hours running even at idle it would get hot enough; /archives//html/Amps/2008-05/msg00024.html (11,988 bytes)
9. Re: [Amps] HV transformer issue (score: 1): Author: "Alex" <alexeban@gmail.com>; Date: Sun, 4 May 2008 10:02:30 +0300; Hi guys: This is definitely an eddy currents issue. Don't forget this is a potentially a 6kVA transformer: it doesn't take much of losses to generate enough current for that kind of heating. Many man; /archives//html/Amps/2008-05/msg00025.html (18,005 bytes)
10. [Amps] HV transformer issue (score: 1): Author: "David H Craig" <n3db@radix.net>; Date: Tue, 6 May 2008 16:44:54 -0400; Thanks again for all the advice gents- problem solved. As a FWIW, I tried powering the transformer (no load, caps) with the bolts removed, and of course no heating of the core at all. Next, as an exp; /archives//html/Amps/2008-05/msg00068.html (8,665 bytes)

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