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Q6) (a) With reference to three-phase transformers, sketch labelled diagrams for EACH of the following connection types indicating line and phase voltages and line currents:

(i) star-star; (4)

(ii) delta-star. (4)

(b) A three-phase, step-down transformer has a turns ratio of 12 and takes 10 A when it is connected to a 6600 V supply. If the transformer is star-delta connected, calculate EACH of the following:

(i) the secondary line voltage; (3)

(ii) the secondary line currents; (3)

(iii) the output kVA. (2)