I've noticed several new pole-mount transformers in my area of a type rather different to those we've been used to seeing over the years, so it looks as though the PoCo has switched to this type for replacements.
Paul, Dave is in fact right about the brand of the transformer. It is indeed an ABB Oil-filled 317 Series Distribution transformer. We've actually got a few of these over here, used on Industrial sites. Just a little note on the use of Star and Delta configurations in Distribution Systems, over here Star is used on the Primary winding in some places in the Network where the Transformer is required to be referenced to Earth. The Earth is taken from the normal Star-point of the Transformer.
Re: New model transformer#143031 04/28/0512:32 PM04/28/0512:32 PM
At school we were told 10 and 20kV distribution networks in Austria usually have a delta configuration, whereas systems with voltages exceeding 20kV (usually 110kV or 220kv) always have a star configuration. 230/400V supplies are usually star.
Re: New model transformer#143032 04/28/0506:56 PM04/28/0506:56 PM
Presumably you mean that the originating windings on the higher voltages are wye (star) configuration but loads are still delta connected. If so, then I wonder if the lower-voltage lines are referenced to ground in any way.
The Cahier Technique paper on MV Distribution Systems has a table showing some of the grouding/neutral methods used, but doesn't include an entry for Austria.
Re: New model transformer#143033 04/29/0503:31 AM04/29/0503:31 AM
Just an addendum to my original post. It's interesting to see them spark gaps on the bushing insulators. We don't use them here on our trannies for some wierd reason. A very worth-while accessory in my opinion. And there's more of that funny green wire. BTW Paul, what is that wire heading downward at an angle from under the base of the transformer?. It looks like a stay wire, but it's point of attachment looks too "flimsy" for it to be one.
Re: New model transformer#143034 04/29/0505:31 PM04/29/0505:31 PM
That arrangement is also fairly common in the States and Canada if I remember correctly. The general idea seems to be to allow the stay to be anchored into the ground closer than would otherwise be practical.