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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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
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