Q1 (a) A balanced star connected load of (8 + j3) Q is connected to a 3-phase, 415 V and 50 Hz supply. Draw the circuit diagram, indicating VRN, VRY and all line currents. Calculate: (i) (ii) The 3...

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Extracted text: Q1 (a) A balanced star connected load of (8 + j3) Q is connected to a 3-phase, 415 V and 50 Hz supply. Draw the circuit diagram, indicating VRN, VRY and all line currents. Calculate: (i) (ii) The 3 line currents (IR, Iy and IB). The total real power (W) and power factor at the 3 phase supply. (b) An unbalanced delta connected load consisting of the phase impedances ZRY (10+j3) 2, ZYB (12+j0) 2 and ZBr (8+j3) N is connected to a 3-phase, 440 V, 50 Hz supply. Draw the circuit diagram including the implementation of a 2 wattmeter power measurement. Using the information above: (i) (ii) Calculate the 3 load phase currents (IRY, IYB and IBR). Draw a scaled phasor diagram indicating all phase and line voltages and the three load phase currents. Using the scaled phasor diagram or otherwise determine the 3 line currents (IR, Iy and IB). (iii)