Here are some pics of "H Shelf" Transformer setups in my area.
These are in Anaheim, CA. (City of Anaheim Department of Water & Power).
Have not seen any of these in SCE's territory surrounding us, but have seen many
in the City of Los Angeles (LADWP).
As you will see, each setup is different from the next.
Image 1: 3Ø 4 Wire Wye setup.
This one is in back of a Masonry Building that's been around my area since
late 1950's. I remember this setup being there since I was at least 3 years old.
Originally, it fed the building as a single Tenant. Around 1980, the shell
was partitioned for three Tenant spaces, so new S.E. risers were added.
The original part is still fed via feeder duct.
Image 2: Two Separate 1Ø 3 Wire Transformers.
This setup was, at one time, a closed Delta 4 Wire system. Currently there are two
separate 1Ø Transformers of apx. 75 KVA size. Each Transformer feeds a single
400 Amp Service Section.
Back in 1970's, this was a closed Delta setup - with an additional 1Ø Transformer
located on an adjacent pole. Now the 3Ø system is a 4 wire Wye of apx. 45 KVA size,
located on the pole, which used to have the 1Ø Transformer on it.
Image 3: Three Separate 1Ø 3 Wire Transformers.
This setup has three individual 1Ø 3 Wire Transformers - not connected at the Secondaries
to form a Polyphase system. Each Transformer feeds a 400 Amp section.
Have been in this building many times (it's one of the banks we worked for).
The building has 3Ø service derived from a closed Delta 3 Wire arrangement on an adjacent
pole. This pole is within 15' of the shelf.
BTW, Electure may recognize this location, along with the location shown in Image 5.
Image 4: Overall View Of The Location Shown In Image 3.
This is the same bank location.
Electure's gotta recognize this one!
Image 5: 3Ø 4 Wire Closed Delta Arrangement.
Sorry for the poor image quality! The Sun really makes the digital camera sad...
If you can make out the arrangements here, the center Transformer is huge!
It's one of those with the cooling tubes on the sides. Might be 167 KVA with
two 75 KVA Xformers on the sides.
I'll see about getting a better shot of this setup.
That's all for now!
Scott35