Delta to Star Transformer Connection

Delta-Star Connection

Key points

As primary in delta connected:

• As Secondary in Star connected
• Line voltage on primary facet = part voltage on Primary facet.
• Secondary part Voltage = K X Primary part Voltage.
• Now Transformation Ration (K) = Secondary part Voltage / Primary part Voltage
• Line voltage on Secondary facet = √3 X part voltage on the Secondary facet. So,
• Line voltage on Secondary facet = √3 X K X Primary part Voltage.
• Line voltage on Secondary facet = √3 X K X Primary Line Voltage.
• There is s +30 Degree or -30 Degree part Shift between Secondary part Voltage to Primary part Voltage

Applications

As for instance, at the start of associate HT cable. during this case, a neutral purpose is stable and can not float just in case of unbalanced loading. there’s no distortion of flux as a result of the existence of a Δ -connection permits a path for the third-harmonic elements.

The line voltage quantitative relation is √3 times of electrical device turn-ratio and also the secondary voltage leads the first one by 30°. In recent years, this arrangement has become very hip for the distribution system because it provides 3- Ø, 4-wire system.