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1. [Amps] questions on my tranformer test (score: 1): Author: "kenw2dtc" <kenw2dtc@comcast.net>; Date: Sun, 12 Jun 2005 14:39:52 -0400; Hi, I'm trying to figure out the current rating of a plate transformer. This is my test setup: http://w2dtc.com/2005-0610-transformer-test-page.htm Questions: 1. Is this a valid way to find the secon; /archives//html/Amps/2005-06/msg00073.html (6,641 bytes)
2. Re: [Amps] questions on my tranformer test (score: 1): Author: "Dr. William J. Schmidt, II" <bill@wjschmidt.com>; Date: Sun, 12 Jun 2005 14:11:50 -0500; I would think that the best way to tell is measure the wire size of the secondary winding. The second best way is measure he cross-sectional area of the transformer, as theoretically it is related to; /archives//html/Amps/2005-06/msg00074.html (9,102 bytes)
3. Re: [Amps] questions on my tranformer test (score: 1): Author: "kenw2dtc" <kenw2dtc@comcast.net>; Date: Sun, 12 Jun 2005 16:07:20 -0400; Dr, I agree with you on measuring the wire size; however, upon investigation the secondary terminals are fed with , thick flat copper bus which has much more area then the actual secondary wires, so; /archives//html/Amps/2005-06/msg00077.html (10,344 bytes)
4. Re: [Amps] questions on my tranformer test (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Sun, 12 Jun 2005 21:14:21 +0100; I think so. Remember that what you have measured is the rms secondary current - which defines the heating effect. The dc current you can end up with depends on several factors but is likely to be 30-; /archives//html/Amps/2005-06/msg00079.html (8,404 bytes)
5. Re: [Amps] questions on my tranformer test (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Mon, 13 Jun 2005 23:03:41 -0500; Ken, the watt rating can be determined by the core size and then the current found from that. But, that dont hold true if they didn't wind the coil with the right size wire for its duty cycle. The on; /archives//html/Amps/2005-06/msg00090.html (9,536 bytes)
6. Re: [Amps] questions on my tranformer test (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Mon, 13 Jun 2005 23:16:51 -0500; William, That's about all you can do besides measuring the internal coil twmperature which is read in the center of each winding. Then make sure that temp is at least 2X less than the wires maximum r; /archives//html/Amps/2005-06/msg00091.html (11,090 bytes)
7. Re: [Amps] questions on my tranformer test (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Tue, 14 Jun 2005 07:53:17 +0100; Hi, Can you not infer the average temperature rise by measures the DC resistance cold and then after some time the DC resistance when hot? The temperature coefficient of copper will give you the mean; /archives//html/Amps/2005-06/msg00094.html (9,373 bytes)
8. Re: [Amps] questions on my tranformer test (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Tue, 14 Jun 2005 02:30:15 -0500; William, Yes there is a long drawn out formula to figure temperature rise and the appromimate temperature it will run at. The problem is it isn't real exact as the construction has a lot to do with i; /archives//html/Amps/2005-06/msg00095.html (12,874 bytes)

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