Angular Displacement

[ProjectDelta]

I’m trying to wrap my head around the concept of “Angular Displacement” in regards to three phase transformer connections. Does anyone have a resource to learn more about it? Also, what is the consequence of not matching displacement in power systems?

 

[don_resqcapt19]

No real concern unless you are connecting the transformers in parallel. There is a 30° phase shift between a delta primary and a wye secondary.

 

[ggunn]

I’m trying to wrap my head around the concept of “Angular Displacement” in regards to three phase transformer connections. Does anyone have a resource to learn more about it? Also, what is the consequence of not matching displacement in power systems?

I know what it means in general; it's just the angle between two vectors or lines, e.g., the angular displacement between phases of a three phase service is 120 degrees.

 

[ggunn]

No real concern unless you are connecting the transformers in parallel. There is a 30° phase shift between a delta primary and a wye secondary.

I would hazard a guess that connecting the secondaries of two transformers with differing angular displacement could let the magic smoke out of a lot of conductors.

 

[don_resqcapt19]

When you look at the little pictorial drawing of the transformer on the nameplate, most are drawn to represent the angular displacement between the primary and the secondary.