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Q14. A three-phase, 690 V, four wire unbalanced system has the following currents:

I_R = 6 A, 0.8 lead I_Γ = 8 A, 0.6 lag I_N = 3 A leading V_RN by 30°

(a) Calculate EACH of the following:

(i) the current in the s phase; (6)

(ii) the phase angle of the S phase current with respect to the S phase voltage; (2)

(iii) the total reactive power. (3)

(b) Sketch, approximately to scale, a labelled phasor diagram to show the relationship between all phase voltages and all currents. (5)