Question

.Three loads, each of resistance 30Ω are connected in star to a 415V, 3-phase supply. Determine :(i) The system phase voltage (ii) The phase current (iii) The line current

Answer 1

(1) Phase voltage:

$$V_p=V_L/\sqrt3=240 \text{ V}.$$

(2) Phase current:

$$I_p=V_p/R=80\text{ A}.$$

(3) Line current:

$$I_L=I_p=80\text{ A}.$$