A short transmission line with R =X= 4 Ωو is supplying a 3-phase load of 500...
A short transmission line with R =X= 4 Ωو is supplying a 3-phase load of 500 MVA, p.f 0.8 lagging from a 3-phase 400K, 50HZ source. Find, voltage at the load and the voltage drop in the supply line. Find the value of the capacitor that has to be connected parallel to the load, to reduce the voltage drop to 50%
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A short transmission line with R =X= 4 Ωو is supplying a 3-phase
load of 500...
A short transmission line with R =X= 4 Ωو is supplying a 3-phase load of 500...
A short transmission line with R =X= 4 Ωو is supplying a 3-phase load of 500 KVA, p.f 0.8 lagging from a 3-phase 400K, 50HZ source. Find, voltage at the load and the voltage drop in the supply line. Find the value of the capacitor that has to be connected parallel to the load, to reduce the voltage drop to 50%
4- - a 3-phase load of 500 MVA ,120 KV at 0.8 p.f lagging find: -...
4- - a 3-phase load of 500 MVA ,120 KV at 0.8 p.f lagging find: - The magnitude of line current I Line – Three-phase (real) power Pload - Phase a |1ine) = ? 30, 500 MVA, 0.8 pf lagging line-to-line Phaseb Phasec
A 60-Hz short transmission line, having R = 0.62 ohms per phase and L = 93.24...
A 60-Hz short transmission line, having R = 0.62 ohms per phase and L = 93.24 millihenrys per phase, supply a three-phase, wye-connected 100 MW load of 0.9 lagging power factor at 215 kV line-to-line voltage. Calculate the sending-end voltage per phase. Determine the voltage regulation of the transmission line. Determine the efficiency of transmission of the transmission line.
Problem 3: (20 points) ase serves two balanced parallel loads. The line- A three-phase transmission line...
Problem 3: (20 points) ase serves two balanced parallel loads. The line- A three-phase transmission line with an impedance (0.2 +j1.0) 12/phase serves two balan to-line voltage at the load end of the line is 480 V (rms). Load 1: Wye-connected and absorbs a total of 200 kW with a lagging p.f. of 0.87. Load 2: Delta-connected with an impedance of (20+30) 2/phase. a. Draw the single phase representation of the circuit b. How much current flows through phase A...
A single-circuit, 50-Hz, 3-phase transmission line is 150 km long. The line is connected to supply...
A single-circuit, 50-Hz, 3-phase transmission line is 150 km long. The line is connected to supply a load of 30 MVA at 0.85 pf lag and 138 kV. The line constants are : R = 0.186 ohm/km, L = 2.60 mH/km, and C = 0.012 μF/km. Using nominal π representation calculate : (a) the ABCD constants of the line. (b) the sending end voltage when supplying (i) no load, and (ii) the above load at the receiving end at the...
A thee-phase short transmission line is supplying a load of 250 MW at 0.8 power factor lagging. The voltage at the receiving end is kept constant at 230 kV. The resistance and reactance per phase of the line are 5 2 and 15 Ω respectively. (i) Calculate th
A thee-phase short transmission line is supplying a load of 250 MW at 0.8 power factor lagging. The voltage at the receiving end is kept constant at 230 kV. The resistance and reactance per phase of the line are 5Ω and 15 Ω respectively. (i) Calculate the voltage regulation. (ii) At what value of the power factor is the voltage regulation zero? Derive the expression used
A 3-phase, 50 Hz overhead transmission line has the following constants
A 3-phase, 50 Hz overhead transmission line has the following constants : Resistance/phase = 9·6 Ω Inductance/phase = 0·097 mH Capacitance/phase = 0·765 μF If the line is supplying a balanced load of 24,000 kVA 0·8 p.f. lagging at 66 kV, calculate : (i) sending end current (ii) line value of sending end voltage (iii) sending end power factor (iv) percentage regulation (v) transmission efficiency
kV/phase, 60 Hz, lossless short transmission line has a short-circuit power of 500 MVA/phase. Consider 7. A a unity power factor load connected at the receiving end. Assume that the sending end volta...
kV/phase, 60 Hz, lossless short transmission line has a short-circuit power of 500 MVA/phase. Consider 7. A a unity power factor load connected at the receiving end. Assume that the sending end voltage is equal to the nominal voltage. a. Determine the maximum active power this line can transmit (5 points) b. Determine the reactance of the line (5 points) c. Using basic equations of circuit analysis, show that the magnitude of the receiving end voltage (VR) is approximately 71%...
Problem #1: A single-circuit, 500 kV, 60 Hz, three-phase transmission line is 250 km long. The...
Problem #1: A single-circuit, 500 kV, 60 Hz, three-phase transmission line is 250 km long. The characteristic parameters of the transmission line are: x0.4 0/km At full load, the line delivers 1000 MVA at 500 kV with 0.80 PF lagging y j4 x 10 S/km r0.045 /km a. Assume that identical shunt reactors (inductors) are connected from each phase conductor to neutral at both ends of the line during light-load conditions, providing 50% total shunt compensation. The reactors are removed...
A 132 kV, 55 MVA, 60 Hz, three-phase, power transmission line is 100 km (62. 1...
A 132 kV, 55 MVA, 60 Hz, three-phase, power transmission line is 100 km (62. 1 mi) long, and has the following characteristics: r = 0.25 Ω/km x = 0.5 Ω/km y = j*S/km What is the per phase total series impedance and shunt admittance of the line? Should the line be modeled as a short, medium or long line? Calculate the ABCD constants of the line. Calculate the sending end voltage and current if the line is supplying rated...
4- - a 3-phase load of 500 MVA ,120 KV at 0.8 p.f lagging find: - The magnitude of line current I Line – Three-phase (real) power Pload - Phase a |1ine) = ? 30, 500 MVA, 0.8 pf lagging line-to-line Phaseb Phasec
Problem 3: (20 points) ase serves two balanced parallel loads. The line- A three-phase transmission line with an impedance (0.2 +j1.0) 12/phase serves two balan to-line voltage at the load end of the line is 480 V (rms). Load 1: Wye-connected and absorbs a total of 200 kW with a lagging p.f. of 0.87. Load 2: Delta-connected with an impedance of (20+30) 2/phase. a. Draw the single phase representation of the circuit b. How much current flows through phase A...
kV/phase, 60 Hz, lossless short transmission line has a short-circuit power of 500 MVA/phase. Consider 7. A a unity power factor load connected at the receiving end. Assume that the sending end voltage is equal to the nominal voltage. a. Determine the maximum active power this line can transmit (5 points) b. Determine the reactance of the line (5 points) c. Using basic equations of circuit analysis, show that the magnitude of the receiving end voltage (VR) is approximately 71%...
Problem #1: A single-circuit, 500 kV, 60 Hz, three-phase transmission line is 250 km long. The characteristic parameters of the transmission line are: x0.4 0/km At full load, the line delivers 1000 MVA at 500 kV with 0.80 PF lagging y j4 x 10 S/km r0.045 /km a. Assume that identical shunt reactors (inductors) are connected from each phase conductor to neutral at both ends of the line during light-load conditions, providing 50% total shunt compensation. The reactors are removed...
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