Question

Three single phase step-up transformers rated at 40 MVA, 13.2 kV/80 kV are connected in delta-wye on a 13.2 kV transmission line

 a. Three single phase step-up transformers rated at 40 MVA, 13.2 kV/80 kV are connected in delta-wye on a 13.2 kV transmission line. If they feed a 90 MVA load calculate the following:

 i. The secondary line voltage

 ii. The current in the transformer windings

 iii. The incoming line currents

 iv. If the transformer types are two (2) additive and one (1) subtractive

 draw the connection diagram for the configuration stated using

 physical representation. 


 b. A 3-phase squirrel cage motor has twelve (12) leads (labelled 1 to 12) at its connection box. Draw the schematic for this motor connected in;

 i. Series star

 ii. Parallel delta



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