On Tue, 26 May 2009 21:55:49 -0400, Ned Simmons wrote:

On Tue, 26 May 2009 20:11:52 -0500, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote:

Gunner Asch fired this volley in
m:


Odd..I do it regularly.

What, at no load? Gunner, I worked for a couple of years in the
design and testing lab of Florida Transitron. I know just a bit about
them, and have made many from scrapped parts of others, since.

A 2:1 step-down transformer is NOT wound precisely to 2:1 ratio,
unless it's: 1)so lightly loaded as to constitute virtually no load at
all, or 2) working at much higher frequencies than 60Hz (and even then
loading plays a factor).

Or 3) if it's in the size range being discussed here. The turns ratio
is tweaked in smaller dry-type transformers, but is equal to the
voltage ratio in larger units. The transition point varies between
manufacturers: Acme compensates single phase xfomers below 1 kVA and 3
phase units below 15 kVA; Hammond drops the compensation at 3 and 6
kVA.

You do need to pay extra attention to the actual internal connections
in 3 phase xformers when reverse connecting.


Yes you do. And you have to adjust the voltage bars carefully to insure
the proper output voltage.

Gunner

"Lenin called them "useful idiots," those people living in
liberal democracies who by giving moral and material support
to a totalitarian ideology in effect were braiding the rope that
would hang them. Why people who enjoyed freedom and prosperity worked
passionately to destroy both is a fascinating question, one still with us
today. Now the useful idiots can be found in the chorus of appeasement,
reflexive anti-Americanism, and sentimental idealism trying to inhibit
the necessary responses to another freedom-hating ideology, radical Islam"

Bruce C. Thornton, a professor of Classics at American University of Cal State Fresno