Q1 (a) A balanced delta connected load of (10 + j3)N is connected to a 3-phase, 415V,50HZ supply. Draw the circuit diagram, indicating VRN, VRY and all line currents, and from this calculate: (i) (ii)...

Answer b and c?

Extracted text: Q1 (a) A balanced delta connected load of (10 + j3)N is connected to a 3-phase, 415V,50HZ supply. Draw the circuit diagram, indicating VRN, VRY and all line currents, and from this calculate: (i) (ii) (iii) The 3 load phase currents (IRY, IYB and IBR). The 3 line currents (IR, Iy and IB). The total real power and power factor at the 3 phase supply. An unbalanced 4 wire star connected load consisting of the phase impedances ZRs (15+j5)N, Zys (10+j0)N and ZBs (18-j6)N is connected to a 3-phase, 440V, 50H7 supply. Draw the circuit diagram ineluding the implementation of a 2 wattmeter power measurement and from this: (b) (i) (ii) Calculate the 3 line currents (IR, Iy and IB). Construct a scaled phasor diagram and using this or otherwise determine the star/neutral current IsN. Include VRY and VRB on the phasor diagram. Calculate the necessary wire diameter for the star/neutral connection to achieve a current density of 3A/mm². (ii) (c) Determine the total real supply power (W) for Q1(b) based on the 2 wattmeter measurements.