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Old 6th November 2012, 10:41 PM   #1
Einric is offline Einric  United States
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Default Mystery Transformer Identification

Hey guys I have a mystery transformer.
It has the following written on it.
E 1068001C
9968310

It is 110V Secondary w/CT.
It appears to have dual primaries for 110/220V operation.

The secondary winding looks to be 14awg.
It weighs about 15 pounds
Any thoughts on the VA rating?
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Old 6th November 2012, 10:54 PM   #2
Einric is offline Einric  United States
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It measures 4.5"x3.75"x5.5"(Across Endbells)
Also .6Ω through the secondary.

Last edited by Einric; 6th November 2012 at 10:57 PM.
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Old 7th November 2012, 06:21 AM   #3
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how many amps do you get out of the secondary if you count on 3A/sq mm, that is 400 circular mils per amp? (Im a stricktly metric guy)

Weight and.size can give an idea about VA rating within 20-25%. Current density in windings is actually the sizing parameters.

If you had superconducting windings, VA rating could have.been infinite
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Old 7th November 2012, 06:32 AM   #4
AJT is offline AJT  Philippines
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around 500VA...
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Old 7th November 2012, 07:55 AM   #5
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And how did you come to that answer?
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Old 7th November 2012, 08:07 AM   #6
AJT is offline AJT  Philippines
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secondary is 110volts, and 5amps on #14 wire is reasonable....
the traffo used a core with 1.5inch center leg and stacked to about 3.5inches....
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Old 7th November 2012, 08:14 AM   #7
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thanks!
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Old 7th November 2012, 12:44 PM   #8
AndrewT is online now AndrewT  Scotland
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Quote:
Originally Posted by Tony View Post
.........the traffo used a core with 1.5inch center leg and stacked to about 3.5inches....
does this indicate a lowish flux in the core? Any idea of the value?
Is that typical of EI power transformers?
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Old 7th November 2012, 10:21 PM   #9
AJT is offline AJT  Philippines
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Quote:
Originally Posted by AndrewT View Post
does this indicate a lowish flux in the core? Any idea of the value?
Is that typical of EI power transformers?
without knowing the primary turns, it is hard to tell...
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Old 8th November 2012, 09:30 AM   #10
AndrewT is online now AndrewT  Scotland
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well, we are seeing a VA rating based on copper in the secondary combined with a high area of core.
Does that imply a low core flux?

Or is it that they simply used less copper in the secondary?

That would imply a high current density in the secondary and thus more I^2R loss creating a hot running transformer if used continuously at maximum VA.

Surely we can infer something from the two numbers we see.
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