Question

In: Electrical Engineering

A 3-Phase, 60 HZ transmission line has the following parameters: L= 2.563 x 10^(-3) H/mi R=...

A 3-Phase, 60 HZ transmission line has the following parameters:

L= 2.563 x 10^(-3) H/mi

R= 0.25 Ohms/mi

Y= 5 x 10^(3) S/mi

The line is 200 mi long and it delivers 150 MW at 220 kV and unity power factor to a substation at its receiving end.

Find the efficiency and voltage regulation of the transmission line.

Solutions

Expert Solution


Related Solutions

A 3-phase 60 HZ , 200km transmission line has a series impedance of z= 0.10 +...
A 3-phase 60 HZ , 200km transmission line has a series impedance of z= 0.10 + j0.35 Ω/km and a capacitive reactance of 0.2 x 10 6 Ω-km. At the receiving end, the line delivers 250 MW @230/30θ kV and 0.95 lagging power factor. Determine a) The line impedance and shunt admittance b) The A, B, C , D parameters c) Sending end complex power and power factor d) Is the PF is leading or lagging e) Voltage regulation for...
A three-phase 60-Hz transmission line is energized with 420 kV at the sending end. This line...
A three-phase 60-Hz transmission line is energized with 420 kV at the sending end. This line is lossless and 400 km long with ? = 0.001265 rad/km and ?? = 260 Ω. a) Suppose a three-phase short-circuit occurs at the receiving end. Determine the receiving end current and the sending end current. b) Determine the reactance and MVar of a shunt reactor to be installed at the load bus to limit the no-load receiving-end voltage to 440 kV. c) When...
A 60-Hz, 230-km, three phase overhead transmission line has a series impedance z = 0.85<78.04 ̊...
A 60-Hz, 230-km, three phase overhead transmission line has a series impedance z = 0.85<78.04 ̊ /km and a shunt admittance y = 5.105 x 10-6 < 90 ̊ S/km. The load at the receiving end is 135 MW at unity power factor and 215 kV. Determine the voltage, current, real and reactive power at the sending end and the percent voltage regulation of the line.
A three-phase motor is delta connected to a 415 V, 60 Hz line. If the line...
A three-phase motor is delta connected to a 415 V, 60 Hz line. If the line current is 25 A and the motor power factor is 0.75, how much power is consumed by the motor (a) Determine the size of the bank of three capacitors to improve the power factor of the motor to 0.95. The capacitors are delta connected. (b) If two of the motors work together, what is the size of capacitors to correct the power factor to...
345 kV, 50 Hz, 3-phase transmission line is 100 km long. The resistance is 0.048 Ω/km...
345 kV, 50 Hz, 3-phase transmission line is 100 km long. The resistance is 0.048 Ω/km and the inductance is 1,24 mH/km. The shunt capacitance is 0.0174 μF/km. The receiving end load is 216 MW with 0.8 power factor lagging at 325 kV. (a) Compute ABCD parameters using π equivalent circuit (b) Sending end voltage VS, (c) Sending end current IS, (d) Efficiency
A 3 phase 460 V, 60 Hz, 4 pole, delta connected induction motor has the following...
A 3 phase 460 V, 60 Hz, 4 pole, delta connected induction motor has the following equivalent circuit parameters. Rs = 0.42 Ω, Rr = 0.23 Ω, Xs = Xr = 0.82 Ω. Xm = 22 Ω. The no load loss = 60 W and may be assumed constant. The rotor speed is 1750 rpm. Use the approximate equivalent circuit ( i.e. the Xm branch is at the very left of the circuit) determine the following a. the synchronous speed...
A single-phase transformer of 3 kVA, 60 Hz, has a voltage ratio on open circuit of...
A single-phase transformer of 3 kVA, 60 Hz, has a voltage ratio on open circuit of 240 / 120 V. The primary and secondary resistances are 0.25 Ω and 0.05 Ω respectively, the corresponding leakage reactance being 0.75 Ω and 0.18 Ω. The transformer delivers current to the load at a 0.9 power factor lagging. Determine the voltage across the load.                                                                   Determine the power dissipated by the load.                                                          Determine percentage voltage regulation referred to the secondary...
A 3 phase 450V (line-to-line), 1150rpm induction machine has the following equivalent circuit parameters. R1=0.33 Ohms,...
A 3 phase 450V (line-to-line), 1150rpm induction machine has the following equivalent circuit parameters. R1=0.33 Ohms, X1=1.3Ohms R2 = 0.25 Ohms X2 = 40Ohms. Determine the following: a) Rated stator current (per-phase) b) Input power factor c) Total power across the air gap d) The full-load torque e) Magnitude of the starting current
A   three-phase,   460-V,   60-Hz,   six-pole   Y-connected   induction   motor   has   Rs = 0.32 Ω, R′ r =...
A   three-phase,   460-V,   60-Hz,   six-pole   Y-connected   induction   motor   has   Rs = 0.32 Ω, R′ r = 0.18 Ω, Xs = 1.04 Ω, X′ r = 1.6 Ω,   and   Xm = 18.8 Ω.   The   no-load   loss,   Pno load,   is   negligible.   The   load   torque,   which   is   proportional   to   speed   squared,   is   180 N#m   at   1180   rpm.   If   the   motor   speed   is   850   rpm,   determine   (a)   the   load   torque   demand   TL; (b)   the   rotor   current   I′ r; (c)   the   stator   supply   voltage   Va;...
A 3 phase 50Hz overhead line has the following constants: R/phase=2ohms; Xl/phase=10ohms and Y/phase=4x10^-4 siemens. The...
A 3 phase 50Hz overhead line has the following constants: R/phase=2ohms; Xl/phase=10ohms and Y/phase=4x10^-4 siemens. The line is supplying a balanced load of 24000 KVA, 0.8 pf lagging at 66KV. Compute for the sending end voltage, sending end current and efficiency of the line using: a.Nominal T Method b.Nominal pi Method c.Rigorous Method
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT