Transformer "ansi points"

[Russell W. Patterson at T.V.A.]

Ya'll:

I'm posting this for a colleague (that is, my friend/pal/mentor/nerd etc...).

What are ansi points?

He's found some old transformer data with a curve composed of these ansi
points. Are they some sort of damage curve data?

thanks & merry CHRISTmas,
russ

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Russell W. Patterson, Tennessee Valley Authority
Transmission/Power Supply, System Protection & Analysis
E-mail: rwpa...@tva.gov
proponent Usenet newsgroup ------> sci.engr.electrical.sys-protection
s.e.e.s homepage ---> http://www.tva.gov/progroup/seesuse/homepage.htm
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[Bruce E. Martin]

rp...@tva.gov (Russell W. Patterson at T.V.A.) wrote:
>Ya'll:
>I'm posting this for a colleague (that is, my friend/pal/mentor/nerd etc...).
>What are ansi points?
>He's found some old transformer data with a curve composed of these ansi
>points. Are they some sort of damage curve data?
>thanks & merry CHRISTmas,
>russ

The ANSI point for a xfmr relates to the amount of time the xfmr can
withstand (without injury) a short circuit on the terminal of any
winding(s). It is directly related to the xfmr impedance....
therefore, it provides a point on the coordination plot which defines
the protective device operating zone in order to protect the xfmr.

There is probably more to it than that, but that is all I know about
it.
Bruce Martin.