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View attachment 9761
Sorry about the poor quality of the scan. At least it's legible, though.
Is this what you're looking for?
View attachment 9761
Sorry about the poor quality of the scan. At least it's legible, though.
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.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:
They have become more efficient, thus generally lower impedance.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.
That would be useful information to share with the class.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.
Ask, and ye shall receive...They have become more efficient, thus generally lower impedance.
That would be useful information to share with the class.
Thanks.:thumbsup:Ask, and ye shall receive...