railway UPMRC SCTO 2024 Mock Test Electrical Machines Transformer Parallel Operation of Three Phase Transformers
The transformer connection Yd 11 implies that:
1
Primary is star connected, secondary delta connected and primary voltage is leading secondary voltage by 60°
2
Primary is star connected, secondary delta connected and primary voltage is leading secondary voltage by 30°
3
H.V winding is star connected; L.V. winding is delta connected and H.V. voltage winding is leading L.V. voltage by 30°
4
H.V winding is star connected; L.V. winding is delta connected and L.V. voltage winding is leading H.V. voltage by 30°