Re: [TCML] Mystery very old

[gary350@xxxxxxxxxxxxx]

The power company maintenance shop here has a small building full of old transformers.  What you discribe sounds like some I saw at the maintenance shop.  That stuff is very old, each coil has only 2 wires with no taps, designed to run on a specific voltage.  I think back in those days if a 20KV power line was reading 18KV 10 miles down the road they ordered a transformer wound for 18KV to use at that location.  There was no taps back then and the transformer they ordered could be used only at any 18KV location.  The maintenance shop here has a bunch of transformers like that I can buy them for scrap metal prices 2 cents/lb. but I don't think they are worth having.  One transformer I looked at said 15KV primary, 110 volts secondary, 5000 watts, date 1950, what in the world could anyone do with a thing like that.  It might be easy to rewind the 110 volt coil to 240 volts.  40 years ago I use to do things like that but not anymore.  I wouldn't haul it home if it was free.

>Hi All,
>
> 
>
>I recently made a run to San Diego to pick up a chicken and a plate transformer.
>Our benevolent seller asked me to take a couple of other heavy iron things.
>One turns out to be a large HV filter choke. The other one is interesting!
>It is an Osborn and states 480V in 240 out with three legs. Ok that seems
>normal until you pull the cover off the old crinkle finish box.
>
> 
>
>A mind shift is in order now. The three windings are wound donuts wrapped
>around a horizontal collective iron core. Weird huh? But wait; there are
>only two wires on each coil. This is very old. Anyone know what this is?
>I'll shoot a picture or two when I free it from the case which will take
>some socket to fit a square nut on an extension. Ya gotta love
>scrounging:-)) It weighs in near 100 lbs- lots of copper too.
>
>Jim Mora
>
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