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A 200-km, 230-kV, 60-Hz, three-phase line has a positive-sequence series impedance
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- Subject: Electrical & Electronics Engineering Course: Power Systems Question: A 160-km, 220-KV, 60 Hz three-phase line has a positive-sequence series impedance z= 0.06+j0.7 Ω/km and a positive-sequence shunt admittance y= j3.88 X 10-6 S/km. At full load, the line delivers 220 MW at 0.8 p.f. lagging and at 200 KV. Using the nominal π circuit, calculate: (a) the ABCD parameters, (b) the sending-end voltage and current, and (c) the percent of voltage regulation. Also explain, in which case the voltage regulation would be negative and why.arrow_forwardQ3: A 200-km, 230-kV, 60-Hz three-phase line has a positive-sequence series impedance z = 0.08 +j0.48 2/km and a positive-sequence shunt admittance y =j3.33 x 10-6 S/ km. At full load, the line delivers 250 MW at 0.99 p.f. lagging and at 220 kV. Using the nominal circuit, calculate: (a) the ABCD parameters, (b) the sending-end voltage and current, and (c) the percent voltage regulation.arrow_forwardA balanced load of 30 MW is supplied at 132 kV, 50 Hz and 0.85 p.f. lagging by means of a transmission line. The series impedance of a single conductor is (20 + j52) ohms and the total phases- neutral admittance is 315 micro- siemens. Shunt leakage may be neglected. If the series impedance reduces by 20% and the admittance is increased by 10%. Find the voltage of the sending end by using nominal T approximation Your answer Using the nominal pi approximation, calculate power factor at the sending end of the line. Your answerarrow_forward
- A single phase 50 Hz generator supplies an inductive load of 5,000 kW at a power factor of 0.707 lagging by means of an over head transmission line 20 km long. The line resistance and inductance are 0.0195 ohm and 0.63 mH per km. The voltage at the receiving is required to be kept constant at 10 kV Q1. the sending end voltage and voltage regulation of line Q2. the value of the capacitor to be placed in parallel with the load such that the regulation is requced to 50 % of that obtained in Q1 Q3. compare the transmission efficiency in parts of Q1 & Q2.arrow_forwardQ2) A 13.2-kV single-phase generator supplies power to a load through a transmission line. The load's impedance is Ztoad 500 236.87° ohm , and the transmission line's impedance is Zine = 60 253.1° ohm. To reduce transmission line losses to 0.0103 of its losses without using the transformers design and use two transformers T1 between the generator and the transmission line and T2 between the transmission line and the load.arrow_forward4. A transformer is rated 1000 MVA, 13.8 kV/345 kV with Z=j0.10 pu. If the system base MVA is 500, the corresponding pu impedance becomes (a) j0.10/2 pu (b) j0.10/4 pu (c) j0.10*2 pu (d) j0.10*4 pu 5. Ia, Ib and I, are the three current phasors of a load. For a balanced-load condition, which relation is valid? (a) IF - (Ib + I.) (c) la + I = 1. (d) Ia - I = I. (b) la = I, = Iearrow_forward
- A single phase line has an impedance of 0.4+j2.7 ohms. The line feeds two -single phase loads that are connected in parallel. The first load is absorbing 264.1 kVA at 0.707 power factor lagging. The second load absorbs 44kW at unity power factor. The voltage at the load end of the line is 2200 V. Assuming at the load end of the line as the reference axis. Determine the magnitude of the voltage at the source end of the line.arrow_forwardQ2) A 13.2-kV single-phase generator supplies power to a load through a transmission line. The load's impedance is Zload = 500 236.87° ohm, and the transmission line's impedance is Zline = 60 253.1° ohm. To reduce transmission line losses to 0.0103 of its losses without using the transformers design and use two transformers T1 between the generator and the transmission line and T2 between the transmission line and the load.arrow_forwardThe 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 impedancearrow_forward
- of stion 4 A single phase transmission line is delivering 450 kVA load at 12 kV. Its resistance is 4.5 2 and inductive reactance is 6 2. If the load power factor is 0.9 lagging. Determine the Current through the line Sending end voltage Sending end power factor Regulation of transmission line Efficiency of transmission line A load of 120 MW at a power factor of 0.8 lagging can be delivered by a 3-phase transmission line. The voltage at the intained at 33 kV and the loss in the transmission as 7.5 % of the power delivered. (Considerarrow_forward2. A 200-km, 230-kV, 60-Hz three-phase line has a positive-sequence series impedance z = 0.07 + j0.58 ohms/km and a positive-sequence shunt admittance y = j4.33 x 10^-6 S/ km. At full load, the line delivers 350 MW at 0.95 pf lagging and at 220 kV. Using the nominal pi circuit, calculate: (a) the ABCD parameters (b) the sending-end voltage and current, and (c) the percent voltage regulation.arrow_forwardA 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.arrow_forward
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