Answer Happy

a) State two reasons why a three-phase system is preferred over a single-phase system for AC transmission and distribution of electrical energy. [2 marks] b) The winding of a three-phase delta connected generator produce the following voltages:- Vab (t) = 353.6 cos(314.16t) V 2π Vbc (t) = 353.6 cos (314.16t V 3 4π Vca(t) = 353.6 cos(314.16t -) V 3 The generator feeds a balanced three phase delta-connected load with impedance of 20+j34.6 22 per phase. The impedance of the line connecting the generator to the load is 3+j42 per phase. Determine:- (i) The three line currents IaA, Ibв and Icc [7 marks] (ii) The three-phase currents IAB, IBC and ICA at the load [2 marks] (iii) The total real power consumed by the delta connected load [2 marks] (iv) The capacitance per phase of a three-phase delta-connected capacitor bank required to be connected across the load terminals to achieve power factor of 0.98 lagging [5 marks]