Delta Wye Dyn1 not Dyn11 4

[madisonbadgers]

I have been reading the following closed thread

http://www.eng-tips.com/viewthread.cfm?qid=41454

And then I found this pdf below.

http://www.labvolt.com/downloads/download/86379_F0.pdf

as I understand this, the Delta Wye example shown on page 20 is a Dyn11 because the Secondary line to line voltage is leading the primary line to line voltage.

Now the next example on page 22 as I read the documents that is a Dyn7? transformer due to the 150 degree lag.

My question is in the US when I buy a transformer from someone like Sq. D
750KVA 480V 3 phase primary and a 120/208V Wye secondary.

http://products.schneider-electric....ail&oid=090089268061ca33&cat=0b008926801a1545

I read on here that a typicall US delta wye transformer is a Dyn1 with the secondary line to line voltage LAGGING the primary side line voltage by 30 degrees.

I like the Labvolt pdf because it included vector and time domain images to help me understand. If someone could help me understand how the dots are arranged in the US typicall transformer I would appreciate it.
thank you for your time and have a good day

 

[madisonbadgers]

In response to some of the above, we are doing a project where the transformer is coming from croatia. It has 4 delta windings at 3160 and a single wye winding that is connecting to the 13.8KV grid.
The 4 windings are connected to 4 inverters paralleled to improve performance.
The unit is coming as a tank, a core, and then we have to wire the windings to the terminal bushings and connect the thermocouples. then we will fill it with oil with the help of a vacuum pump.

When we took on this project we felt when we required the drive manufacturer to provide the grid side(7MVA Delta/ungrounded Wye) and the test side transformer(the transformer described above) I would recieve an assembled and factory tested unit.
It turns out I was mistaken and that putting a core in the tank, connecting the windings to the correct terminal bushings and all the other work was part of "Installation"
I am working on getting drawings from the transformer manufacturer to make sure all the windings are arranged correctly.
I will be grounding the test side Wye winding.
The input side(7MVA) isnt grounded becuase their drive derives a pseudo ground point and solidly grounding it would prevent them from doing what they want. I am using 15KV 100% rated cable on the 3160 side because this pseudo ground is apparently not perfect so they do see some voltage "abnormalities" on the input side. They are using the ungrounded wye inductance (10.6%) impedance as the first L of their LCL harmonic filter.

I do appreciate all the input and I am working to understand this before I am on site supervising the electrician, but at the end of the day the EC wont take any responsibility, and they shouldn't.
The links provided have been very helpful. have a great thanksgiving.