Re: Question about Using Low DCR Power Xfrmrs in amp circuits

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In Reply to: Question about Using Low DCR Power Xfrmrs in amp circuits posted by Ian L. on October 12, 2002 at 16:23:57:

Hi Ian and Kevin:
Hope you don't mind me making a comment on this subject.
RE: low DCR in power tranneys several thoughts come to mind.
1) most DCR measurements your see are of the windings cold and not at operating volts and currents. The "hot" windings can be signficantly higher. And there is not a relationship that the lower the cold DCR then, ipso facto, the lower the HOT DCR will be.
2)the DC resistance of the copper circuit is only one of several IMPEDANCES in a power transformer. By itself, even taking into account point 1 stated above, the DCR of the copper winding could well be (in some designs) the smallest impedance of the transformer overall. The impedance of the core assembly can and does in some designs swamp the loss mechanism of the DCR of the copper circuit.
And these core losses will be present in any trans made on the planet. Thing is a trans with a real, real low copper DCR but built on a junk core could still have a cumulative impedance that is much, much higher than another specimen built on a better core but which has, as an example, a slightly higher DCR in it's copper circuit.
Point is that DCR vastly underdescribes what is important in a power transformer is considered solely and exclusively as a barometer of quality in a power transformer.
MSL

Edits: 07/07/20 07/07/20 07/07/20

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Follow Ups Full Thread

Topic - Question about Using Low DCR Power Xfrmrs in amp circuits - Ian L. 16:23:57 10/12/02 (7)

butt in w/another question - Sector-7G 18:41:56 10/26/02 (1)

No downside. - gdahl 21:15:30 10/27/02 (0)

Thanks for the answers guys , 't helps . (nt) - Ian L. 22:37:54 10/18/02 (0)

Re: Question about Using Low DCR Power Xfrmrs in amp circuits - gdahl 15:12:28 10/17/02 (0)

Re: Question about Using Low DCR Power Xfrmrs in amp circuits - MQracing 21:53:07 10/16/02 (1)

Re: Question about Using Low DCR Power Xfrmrs in amp circuits - KevinC 03:33:24 10/17/02 (0)

Re: Question about Using Low DCR Power Xfrmrs in amp circuits - kevinc 05:21:49 10/13/02 (0)

Follow Ups

Re: Question about Using Low DCR Power Xfrmrs in amp circuits - MQracing 21:53:07 10/16/02 (1)

Re: Question about Using Low DCR Power Xfrmrs in amp circuits - KevinC 03:33:24 10/17/02 (0)

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