Nameplate Vector Diagrams-overlaying vectors=phase shift?
Nameplate Vector Diagrams-overlaying vectors=phase shift?
(OP)
Am I correct that simply overlaying vectors on transformer nameplates will indicate the phase shift from primary to secondary? Is this true of all transformers nameplates - Dy5, Dy11, Yd1, Yd5, Yd11, etc...?
For example, a Dy1 vector diagram from one of our 115D/13.8Y transformers - if you overlay the wye over the delta it shows the H1 is leading X1 by 30 deg (CCW rotation & A-B-C sequence).
H2 X2
. .
. . .
. . .
. . X1 . . . . . .
. . .
. . .
. . . . . . . . .
H1 H3 X3
On a Dy11 nameplate, the wye would be turned 60 deg CCW (compared to Dy1 vector)?
I appreciate your time answering these kinds of questions.
For example, a Dy1 vector diagram from one of our 115D/13.8Y transformers - if you overlay the wye over the delta it shows the H1 is leading X1 by 30 deg (CCW rotation & A-B-C sequence).
H2 X2
. .
. . .
. . .
. . X1 . . . . . .
. . .
. . .
. . . . . . . . .
H1 H3 X3
On a Dy11 nameplate, the wye would be turned 60 deg CCW (compared to Dy1 vector)?
I appreciate your time answering these kinds of questions.






RE: Nameplate Vector Diagrams-overlaying vectors=phase shift?
isoA120
RE: Nameplate Vector Diagrams-overlaying vectors=phase shift?
IsoA120
RE: Nameplate Vector Diagrams-overlaying vectors=phase shift?
RE: Nameplate Vector Diagrams-overlaying vectors=phase shift?
http://lemewww.epfl.ch/ME/publications/2002/pcim2002tra...
http://www.mss.de/eng/stromversorgungen/produkte/pdf/gr...
(for page 4)
Also, search for
Phase angles on DYN11 transformers
in this Forum
RE: Nameplate Vector Diagrams-overlaying vectors=phase shift?
Dy1 is common to my area. I seldom get an opportunity to see nameplates on transformers other than type Dy1.
It's good to know that overlapping vectors does indicate leading or lagging phase shift since nameplates don't designate Dy1, Dy5, Dy11, Yd1, Yd5 or Yd11 (I haven't noticed it). They only show the vector diagrams.
You can quickly know the phase shift by drawing the overlapped vectors.
RE: Nameplate Vector Diagrams-overlaying vectors=phase shift?
RE: Nameplate Vector Diagrams-overlaying vectors=phase shift?
If you multiply the number in the vector group designation by 30 it will indicate the angle by which the primary voltage leads the secondary voltage.
Examples: Dy1 -> 1 x 30 = 30 degrees
Dy5 -> 5 x 30 = 150 degrees, etc.
God bless!
RE: Nameplate Vector Diagrams-overlaying vectors=phase shift?
RE: Nameplate Vector Diagrams-overlaying vectors=phase shift?
http://www.siemens.com.mx/PTD/downloads/Power%20Enginee...
for: page 5/4 for transformer vector group. Notice, that 30deg lag or 30deg lead associated with Yd1 or Yd11 or vice versa is not explicitly stated.
RE: Nameplate Vector Diagrams-overlaying vectors=phase shift?
It may be that manufactures don't list the Dy# on nameplates because customers can connect A-C-B sequence and cause a Dy1 to act as a Dy11. Just a thought.
mvcjr - without the Dy# on the nameplate you don't have anything to multiply by 30 degrees.
RE: Nameplate Vector Diagrams-overlaying vectors=phase shift?
However, with frequent exposure to vector diagrams you can immediately relate a vector diagram it to its corresponding vector group.
God bless!