2400V delta to 2400V gnd wye pass thru

[wbd]

I have encountered a transformer configuration I have not seen before and trying to determine the advantages. The distribution system is a 2400V delta system but there are a few 3 phase transformers that are set up as a pass thru. They are a bank of 2400V delta to 2400V gnd wye which creates a 4160Y/2400V mini system. Connected to that are single phase radial underground circuits that feed a home. What is the advantage of creating a mini system like this?

 

[wroggent]

It would allow the use of a single bushing transformer for the residential feed. Also allows a single cable with concentric neutral to be installed versus two cables.

 

[Mbrooke]

More power (4,160) and the ability to use the two bushings on the pad as a feed through instead of one being H1 the other H 2 which significantly increases flexibility in being able to isolate faulty sections of the loop via switch on the pad mount. No extra splices or gear needed.

 

[RRaghunath]

The star connection provides for neutral that can be earthed and thus making it earthed system.
The unearthed (Delta) system is not preferred where large amount of cabling is involved due to possibility of arcing grounds and associated damage in case the first earth fault doesn't isolate the system.
With earthed system, it is possible to identify individual faulty feeder and isolate quickly without affecting the rest of the system.