A 3-phase, 60 Hz, long transmission line of 442km has |Vs| = 1.0 p. u., and |VR| 90% of V, Line impedance is Z. = 4502, & 0max How many lines are needed to transfer 8750 MW when the Vrated = 820kV? Number of required lines =
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- The VSWR on an 50-Ohm transmission line is 5. The distance between successive voltageminima is 80 cm while the distance from the load to the first minimum is 30 cm. What are thereflection coefficient and load impedanceA 220 kV, 50 Hz, three-phase transmission line is 60 km long. The resistance per phase is 0.15 ohms/km and the inductance per phase is 1.3 mH per km and the shunt capacitance is negligible. Use the short line model to determine; i) the voltage and power at the sending end ii) voltage regulation and efficiency when the line is supplying a three-phase load of 350 MVA, 220 kV at a power factor of 0.85 lagging.A 220 kV, three phase transmission line is 50 km long. The resistance per phase is r 2 per km and the inductance per phase is L mH per km. The shunt capacitance is negligible. If the line supplies a three-phase load of 229 MVA at 0.8 power factor lagging at 220 kV with an efficiency of 97.13% and a voltage regulation of 4.7581%. Use the short line model to find the line resistance and inductance of the line.
- A 132 Kv, 50 Hz, 3-phase tensmission line delivers a load of 5omw at 08 lagging Pf. the transmission line have: A-D: 0 95 Lu" 190 C-0. Ool5 B-96 using Nominal Tto Calculade: regulation of the line and charging Curent?vii. RCC poles... R... .C... . used to support transmission tower ix. Calculate charring current per phase for 66kV overheard line in cable using line to neutral capacitance of 0.9 nano Farad capacitance. х. What do you understand by electrical potential at a point on the transmission line conductor... .(one line answer) (Note: add reference if required at the end of answer sheet)A 3 phase, 50 HZ, transmission line represented by TI-model and having the following parameters, A= 0.95L 1° and B = 100L 80°. The line supplies a full load of 80 MW at 220 KV and 0.8 lagging power factor. Determine the following (w a. The elements of the tra. ssion line matrix C and D. b. The values of the line parameters R, L, Rsh and Csh- c. The sending end complex power and power factor. d. The voltage regulation. e. The equivalent transmission line matrix if another line with parameters Z = 7+j70 O/phase and Y = j0.00 S/nhase is connected in parallel with the existing line. h 4 decimal places):
- Q1: A 3-phase of sequence ABC transmission line has a conductors of cross section area (82 mm?) and a diameter of (1 cm) as shown in figure below. Delivers a load of 15 MW at 30 kV and power factor of 0.78. Determine the efficiency and voltage regulation of the line. If the line length (65km). The line is completely transposed. For the copper p = 1/58 per meter length. 3 m 4 m 6 m 4 3 mDevelop a small-scale equivalent transmission line pi model (per phase) of the transmission lines with the specification given in table 1. The conductors are placed with a flat horizontal spacing of 7.25 meters. Consider that the load connected against the line 125MW at 0.85 lagging power factor. You are required to develop an equivalent model for a maximum 220V (RMS) sending and receiving end voltage and a maximum of 5A load current. Sr. NTDC Transmission Line Length Conductor No. Туре 220 kV DG Khan-Loralai Transmission Line (227 km) 227km Pheasant TABLE AJ Electrical characteristics of bare aluminum conductors steel-relnforced (ACSR)+ Reniertance Reactance per conductor 1-ft apacing. 60 Ha Ae, 60 Ha Capaitive Aluminum ares, emil Layers of Outaide aluminum diameter, in a/1,000 ft soC, D/ml GMR Induetive Stranding AL/8t De, 20°C. 20C, a/mi Code word D. t Ma-mi Waswing Partridge Ostrieh Merlin Linnet Oriole Chickndee Ibin Pelienn Flicker Hawk 266,800 206,800 300,000 336, 400 336.400…A 300 km transmission line with a VR% of 95% and efficiency of 90% is operating with 230 kV voltage line. The load to be supplied is 300 MW with 0.8 power factor lagging. Determine the best values of resistance, inductance and capacitance that could match with the conductor configuration and code from Table A.3. Use the propagation constant value of 0.0456+ j0.4750 ohm and characteristic impedance of 406.4 cis (-5.48") ohms.
- 1) A 60-Hz, ...-km, three-phase overhead transmission line has a series impedance z = 0.8431L79.04 ohm/km and a shunt admittance y = 5.105 × 106 L90 S/km. The load at the receiving end is 125 MW at unity power factor and at 215 KVLL. Determine the voltage, current, real and reactive power at the sending end and the percent voltage regulation of the line for nominal pi network. (Please determine the length of the transmission line within the specified limits: 150-220 km. By considering the length value you determined yourself, solve the question.)Consider a DVR compensated single phase system as shown below. a) Without DVR, find the load terminal voltage (VL) if line resistance (Rs) is negligible with Xs = j0.5 pu , ZL = 0.8 + j0.5 pu and Vs= 1pu with angle equals to 0º.b) With DVR, if Vs=VL=1pu with angle equals to 0º, find the voltage Vtand the DVR voltage injected (Vf).b) A 6052 characteristic impedance transmission line is fed by a DC source of 100V with an internal resistance of 4002. The line is 200m long and has a dielectric constant of 2.25. The load impedance is 12002. Calculate: i. The load reflection coefficient. ii. The source reflection coefficient. iii. What is the voltage at the source terminals just before AND just after 2us?