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Q6). (a) State the disadvantages of operating electrical circuits at a lower power factor. (2)

(b) A three-phase, 6600 V/440 V, 80 kVA transformer supplies a unity power factor load of 15 kW and an inductive load of 55 kW at 0.67 power factor.

Determine the minimum kVAR rating of a capacitor tank to ensure that the supply transformer is not overloaded. (7)

(c) Calculate the value of output current for the transformer in Q6(b) before and after power factor correction being applied. (7)