Electrical Engineering ⇒ Topic : Star-Delta Connection
Figure (a) shows three-phase transformer having star and delta connections on primary and secondary windings, respectively.
Figure (a) shows the phasor diagram of both the primary and secondary sides. From
Figure (b), it can be seen that there is 300 phase difference between the primary and secondary line voltages. The neutral is available on primary side and the secondary allows the flow of third harmonic. The main use of this transformer is to step down the voltages and hence it is used at the distribution side, i.e., after the transmission, i.e., at the receiving end.
Figure (a) Star-delta connection. Figure (b) Phasor diagram of star-delta connection.
Let VL1 and Vph1 be the line voltage and phase voltage respectively on primary side, VL2 and VPh2be the line voltage and phase voltage respectively on secondary side and a be the turns ratio.
Since secondary is connected in delta, this type of transformers do not suffer for unbalanced load.
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