Electrical Engineering ⇒ Topic : Delta-Delta Connection
Figure (a) shows three-phase transformer having delta connections on both the primary and secondary windings.
Figure (b) shows the phasor diagram of both primary and secondary sides. From
Figure (b), it can be seen that there is no phase difference between the primary and secondary voltages. This connection is economical for large low voltage transformers because it increases the number of turns per phase
Figure (a) Delta-delta connection. Figure (b) Phasor diagram of delta-delta connection
Let VL1 and Vph1 be the line voltage and phase voltage, respectively, on the primary side,
VL2 and Vph2 be the line voltage and phase voltage, respectively, on the secondary side and a be the turns ratio.
For delta connection, VL1 = Vph1 and VL2 = VPh2
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