A sub-station supplies power at 11 kg 0.8 p.f. lagging to a consumer through a single phase transmission line having total resistance (both go and return) of 0.15 ohm. The voltage drop in the line is 15%.
If the same power is to be supplied to the same consumer by two wire d.c. system by a new line having a total resistance of 0.05 ohm and if the allowable voltage drop is 25%, calculate the d.c. supply voltage.