IEEE reference transfomer impedance data

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anbm

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Does anyone have a copy of IEEE reference transformer impedance data?
 
Is this what you're looking for?
IEEE 242-1986 Pg 12.JPG
Sorry about the poor quality of the scan. At least it's legible, though.
 
From GE Application Information Short-Circuit Current Calculations- see attachment.
Single Phase Transformer Impedance GE.jpg
 
This is the only single-phase information I found in that IEEE book. In case you can't read the fine print below the table, it says, "*National standards do not specify %Z for single-phase transformers. Consult manufacturer for values to use in calculation." So I'm not sure how useful this will be to you, but here it is anyway.
IEEE 242-1986 Pg 23.JPG
 
It is very interesting in the new edition of IEEE 242 from 2001 it is no indication of transformer impedances.
I think these data was copied from ANSI/IEEE C 37.010 from 1979 and now are obsoleted [on 1999 Edition].:ashamed:
 
Julius Right said:
It is very interesting in the new edition of IEEE 242 from 2001 it is no indication of transformer impedances.
I think these data was copied from ANSI/IEEE C 37.010 from 1979 and now are obsoleted [on 1999 Edition].:ashamed:
Click to expand...
That's very possible. The only edition of IEEE 242 I have access to is the old 1986 one, and I know transformer design hasn't remained stagnant these past 28 years.

I got a nice spreadsheet of transformer R/X/Z values from my local Eaton rep about 5 years ago, and that's what I tend to use for my short circuit calcs. There are different values for standard, K-4 and K-13 rated; copper and aluminum windings; and 150, 115 and 80 degree temperature rise -- giving me a better chance of having my calcs match up with reality.
 
JDBrown said:
That's very possible. The only edition of IEEE 242 I have access to is the old 1986 one, and I know transformer design hasn't remained stagnant these past 28 years.
Click to expand...
They have become more efficient, thus generally lower impedance.

JDBrown said:
I got a nice spreadsheet of transformer R/X/Z values from my local Eaton rep about 5 years ago, and that's what I tend to use for my short circuit calcs. There are different values for standard, K-4 and K-13 rated; copper and aluminum windings; and 150, 115 and 80 degree temperature rise -- giving me a better chance of having my calcs match up with reality.
Click to expand...
That would be useful information to share with the class.:)
 
mivey said:
They have become more efficient, thus generally lower impedance.

That would be useful information to share with the class.:)
Click to expand...
Ask, and ye shall receive...

Apparently, you can't upload Excel files, so I had to tack a ".doc" extension onto it. Just delete that part from the file name, and you should be able to open it.

I don't know if it was a work in progress when I got it, or what, but there seems to be some information missing. It's still a useful tool, though.
 

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