Q2) A 3-phase transmission line has an impedance of 1 + j2 /phase. If it supplies a 3-phase load of 1 MW at 0.8 lagging p.f and 4200 V, find: (a) the power loss in the line. (b) the line voltage at the supply end.
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A: inductive reactance=2×π×f×L. current flowing in line=power delivered3× voltage× power factor…
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Q: hallo A 69-kV, three-phase short transmission line is 16 km long. The line has a per phase series…
A: Question . A 69-kV, three-phase short transmission line is 16 km long. The line has a per phase…
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Q: A load of 140 MW at a power factor of 0.8 lagging can be delivered by a 3-phase transmission line.…
A: given total power delivered is 140 mw so total losses are 0.065*140 =9.1 mw
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Q: A 275 kV, 50 Hz, 65 km transmission line has a series impedance of 0.12 + j0.5 O/km. By neglecting…
A: EFFICIENCY: Efficiency of transmission line is defined as the ratio of receiving end power to…
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A: The solution can be achieved as follows.
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A: 1_∅ power=3-∅ power3. Per phase voltage=line voltage3power losses=3×I2 R.
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Q: A 3-phase, 60 Hz, 25 km long overhead line supplies 425 kW at 22 kV, 0.6 p.f. lagging. The line…
A: inductive reactance=2×π×f×inductance. current=power delivered3×voltage×power factor.…
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A: Given, Active power at receiving end, PR=100MWpower factor, cosϕ=0.75 D=0.98∠3B=110∠75
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- Let a series RLC network be connected to a source voltage V, drawing a current I. (a) In terms of the load impedance Z=ZZ, find expressions for P and Q, from complex power considerations. (b) Express p(t) in terms of P and Q, by choosing i(t)=2Icost. (c) For the case of Z=R+jL+1/jC, interpret the result of part (b) in terms of P,QL, and Qc. In particular, if 2LC=1, when the inductive and capacitive reactances cancel, comment on what happens.The three-phase source line-to-neutral voltages are given by Ean=100,Ebh=10+240, and Ecn=10240volts. Is the source balanced? (a) Yes (b) NoAC Power and Power Factor 1. Two loads are connected in parallel across a 13,200-volt line. Load A draws 200kW at 0.6 p.f. (lagging), load B takes 200kVA at 0.8 p.f. (lagging). Find the reactive, apparent and true power and the line current.
- Q2) 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.4) A balanced delta connected load of ...+j18 ohm per phase is connected at the end of a three phase line as shown in figure. The line impedance is 1+j2 ohm per phase. The line is supplied from a three-phase source with a lie- to-line voltage of 207.85 V rms. Taking Van as reference, determine the following: a) Current in phase a. b) Total complex power supplied from the source. c) Magnitude of the line-to-line voltage at the load terminal. (Please determine the impedance value within the specified limits: 16-26 V. By considering the impedance value you determined yourself, solve the question.) ao- |V₂| bo Co- 1 +j2 Ω = 207.85 V www Figure a Jum ...+j18 n bQ2) 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.
- An 11kV, three phase transmission line has a resistance of 2 ohm and reactance of 4 ohm per phase. The efficiency of the line when supplying a load of 4MW at 0.8 lagging power factor is nearly .. Select one: O a. 97.8 % O b. 90.6 % OC.95.4 % O d.99.2 %A load of 130 MW at a power factor of 0.6 lagging can be delivered by a 3-phase transmission line. The voltage at the receiving end is to be maintained at 57 kV and the loss in the transmission is 5.5 % of the power delivered. (Consider the line to be a short transmission line) Find: A) Single phase Power delivered. B) Per phase voltage. C) Current flowing through the transmission line. D) 3 Phase Losses in the transmission line. E) Per phase resistance of the transmission line.(2) (z) Just to make sure as a preliminary question... if the base quantity is XB and the actual value of the quantity is X, write down the fundamental definition of X,mu: In a 3 phase balanced AC system, suppose that we have already chosen the 3 phase power base S and the line to line voltage base V. Now we choose the rest of the bases in a coordinated way. (a) What is the single phase power base SB that makes the 3 phase power and the single phase power numerically equal in per unit? (b) What is the line to neutral voltage base VB that makes the line to line voltage and the line to neutral voltage numerically equal in per unit? Show that it works. (c) What is the line current base IB that makes S = VI* work out in per unit? First give the answer expressing IB in terms of SB and VB. Then express Ig in terms of S and V. (d) What is the impedance base ZB that makes the V = ZI work out in per unit? First give the answer expressing ZB in terms of VB_and IB. Then express ZB in terms of VB…
- A 60Hz sourcewith an effective voltage of 240 volts supplies 4500 volt-amp to a load with a p.f. of 0.75 lagging. Determine the parallel capacitance required to improve the power factor to: a) 0.9 lagging and b) 0.9 leading. What per cent reduction in line current resulted in part (a)?THESE ARE THE QUESTIONS FROM THE SUBJECT POWER SYSTEM FUNDAMENTALS AND THE CHAPTER IS PERFORMANCE OF TRANSMISSION LINES AND THE TOPIC IS SHORT TRANSMISSION LINES THE ANSWERS ARE GIVEN WITH THE QUESTION PLEASE DO ALL THE QUESTIONS PROPERLY „DONOT SKIP ANY STEP AND DO YOUR BEST 4.) Estimate the distance over which a load of 15000 kW at 0-85 p.f. can be delivered by a 3-phase transmission line having conductors of steel-cored aluminium each of resistance 0-905 O/phase per kilometre. The voltage at the receiving end is to be 132 kV and the loss in transmission is to be 7-5% of the load. [69-55 km] 5). A 3-phase line 3 km long delivers 3000 kw at a p.f. 0-8 lagging to a load. The resistance and reactance per km of each conductor are 0-40 and 0-3 Q respectively. If the voltage at the supply end is maintained at 11 kv, calculate: (i) ceceiving end voltage (line-to-line) (ii) line current (ii) transmission efficiency. [(i) 10.46 kv (ii) 207 A (ii) 95%] 6). A short 3-0 transmission line with an…an a transmission line has an impedance of 4 j2 Ohms/phase, Find the per-unit impedance of this line on a base of 100 MVA and 20 KV. Select one: O a. None of these Ob. 20-j10 (p.u) Oc 1-0.5 (p.u) O d. 0.5-j1 (p.u)