Transformer wiring
Transformer wiring
(OP)
I had a question about the wiring in the uploaded circuit. the 3 phase power is 480V. I understand the voltage between 2 phases is going to be sqrt(3)*line voltage which would supply the transform, which would normally step it up or down. I came across a schematic with the primary and secondary windings jumpered as shown. My question is what would happen? I realize that the transformer would no longer be isolated but what voltage would it output? My initial inclination is that it would increase or decrease the output voltage based on its phase angle but I could be mistaken. I also realize that that is most certainly not a normal way to wire a transformer. Could any of you point me in the right direction, or explain what would happen? Thank you in advance.






RE: Transformer wiring
NO
The voltage between two phases IS line voltage.
The voltage will be Primary voltage PLUS secondary voltage.
OR
The voltage will be Primary voltage MINUS secondary voltage.
It depends on whether the transformer is additive or subtractive polarity.
output voltage based on its phase angle
Phase angle is the difference between two voltages at different phase angles.
A single phase circuit it not much different from itself.
This circuit is used to check polarity and is used whenever an auto transformer is needed. One of the most common uses is for voltage adjustments.
eg: 480V to 600V, 600V to 480V, 120V to 108V (Used for incandescent accent lighting in department stores to increase lamp life.)
Used to correct low voltage conditions (or high voltage conditions)
Used for motor starting.
Bill
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"Why not the best?"
Jimmy Carter
RE: Transformer wiring
RE: Transformer wiring
Secondary voltage will be Us = 460 * Ns / Np.
Ns - number of turns on secondary winding
Np - number of turns on primary winding
Why connection like this is used I don't know.
This is not typical autotransformer connection.
Milovan Milosevic
RE: Transformer wiring
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Transformer wiring
RE: Transformer wiring
But as I understood original question was what will be with output voltage (two terminals bellow). My answer was in this direction that this bridge will not change anything with output voltage.
Milovan Milosevic
RE: Transformer wiring
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Transformer wiring