Question

to distribute the power at 415v over 3 phase 3 wire line ____ substation is used.​

Answer 1

From our electricity board the supply voltage between phase to phase is 415V. Hence we get 415V directly by using two of the phases. Basically 3 phase supply is with 415 Volts. This 415 volts in between two phases (say red and Yellow) out of any three phase points.