1. Statement
A star connected load of 3300 kVA at 18 kV and a power factor of 0,8 lagging is supplied by a three-phase transmission line having a resistance of 4Ω per phase and an inductive reactance of 7Ω per phase.
Determine:
a. the sending-end voltage
b. the percentage regulation
c. the efficiency of the line
2. Attempted answer
For (a), first i took the resistance and reactance to get impedance:
Zphase = 4 + j7 = 8,062 |60,26° Ω
then i use the rating: S = I × V (not sure if i should use VLine or Vphase)
then to find voltage drop: E = I × Z (which current do i use?)
I've attached my attempt.
A star connected load of 3300 kVA at 18 kV and a power factor of 0,8 lagging is supplied by a three-phase transmission line having a resistance of 4Ω per phase and an inductive reactance of 7Ω per phase.
Determine:
a. the sending-end voltage
b. the percentage regulation
c. the efficiency of the line
2. Attempted answer
For (a), first i took the resistance and reactance to get impedance:
Zphase = 4 + j7 = 8,062 |60,26° Ω
then i use the rating: S = I × V (not sure if i should use VLine or Vphase)
then to find voltage drop: E = I × Z (which current do i use?)
I've attached my attempt.
