Transformer Phase Shift

[AggiesNM]

Hey,

In the attached picture, the 30degree phase shift transformer is shown. Now I would like to change this to a 330degree DYn11. How do I accomplish this using phase leads that are landing on the transformer bushing?

 

[HamburgerHelper]

I really think you need just draw out the vectors and go through all the combination. There really aren't many and it is important to see how to get all the different possible combinations. I think there are four connections angles you can have. 30, 150, 270, 330.

Here is a DYN11

https://qph.fs.quoracdn.net/main-qimg-ab5510250dab43c725e8659c834c958f.webp

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If you can't explain it to a six year old, you don't understand it yourself.

 

[AggiesNM]

I know there are other phase shifts possible. I was looking through the Basler paper on the phase shift. It is nice to see all combinations possible but the re-wiring was all done inside the transformer.

I am still unable to process in my head, how rolling or flopping phases externally gets us the phase shift. Doesn't rotating the phasor on one side rotate the phasor by the same angle on the other side?

Looking at your attached file, you flipped phases on H2 and H3. But looking at the phasors, high side still leads the low side by 30deg. It doesn't look like Dyn11.

Thank you for your time.

 

[davidbeach]

You can actually get all 6 odd multiples of 30 degrees. Simply rolling phases on one side gives you three of the six, either 30, 150, and 270 or 330, 210, and 90.

To get between those two sets it is necessary two swap two phases on each side, say H1 with H2 and X1 with X2. The other two possibilities in that group are then a roll away.

Just swapping on one side changes the other side phase rotation. Assuming you start with ABC any one swap will produce ACB.

 

[bwen08]

Instead of connecting the transformer H1/X1-A, H2/X2-B, H3/X3-C, physically change the buswork such that H1/X1-C, H2/X2-B, H3/X3-A. Sorry the ink has faded and required inversion.

 

[stevenal]

faq238-1154

 

[jghrist]

Reverse A & B on the primary and on the secondary. See attached calcs.

 

[jghrist]

Here's the calcs for Dyn1 without reversing phases.

 

[jghrist]

My calculations had an extraneous kV unit definition that made any results in volts weird. See the corrected calcs.

 

[jghrist]

And the other calcs (without reversing phases).