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There is a phase difference of______ between the corresponding phases of primary and secondary______ in a star/delta transformer.
  • a)
    30 degrees, Voltage
  • b)
    60 degrees, Voltage
  • c)
    Zero degree, Current
  • d)
    45 degrees, Current
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
There is a phase difference of______ between the corresponding phases ...
Star-Delta transformer:
  • Consider a 3-phase star-delta transformer with primary side Y connected (star connected) and secondary side with delta connected as shown below
  • The polarity markings are indicated on each phase.
  • The dots on the winding indicate the terminals which are positive at the same time on the undotted terminals.
  • Phase on star side – A, B, C
  • Phase on delta side – a, b, c
  • The labeling is indicated to the diagram corresponding to +90° connections in which the positive sequences on the delta side are lead by 90° corresponding to the star side.
  • Thus the line current flows through the phase and A.
  • If we label delta as b → a, c → b, and a → c. There we will get standard Yd1, –30° connection
  • If polarities on the delta side are also reversed, we get standard Yd11, 30° connection as shown in the figure given below.
  • Thus we can get a phase difference of 30° between input and output of three-phase transformer by using a star-delta connection.
 
 
Important Points:
The phase shift in different connections of transformer are given below.
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