= In a balanced A-Y circuit, Vab= 240/15° and Zy (12+ j15) 2. Calculate the line currents.
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- In a balanced system, the phasor sum of the line-to-line voltages and the phasor sum of the line-to-neutral voltages are always equal to zero. (a) False (b) TrueQuestion 5: A single-phase transmission line has a resistance of 0.22 ohm and inductive reactance of 0.36 ohm. Find the voltage at the sending end to give 500kva at 2000V at the receiving end at a load power factor of 0.707 lagging. Also find the efficiency of transmission at this load. Subject Power Transmission and DistributionProblem 5. An 11 kV, 3-phase transmission line has a resistance of 1·5 Ω and reactance of 4 Ω per phase. Calculate the percentage regulation and efficiency of the line when a total load of 5000 kVA at 0.8 lagging power factor is supplied at 11 kV at the distant end.
- The parameters of a three-phase line 200 km long are resistance/km= 0.15 2, inductive/km = 0.5 2, and capacitive susceptance/km=2 x 10-6 U. The transmission line is delivering 50 MVA at 132 kV with power factor = 0.85 lagging. Use nominal T method to determine; 1) sending end voltage 2) sending end current 3) sending end power factor 4) transmission efficiency and 5) voltage regulation4.The sending end and receiving end voltages of a 3p transmission line at a 200MW load are equal. The maximum power transmitted per phase is 566.2 MW. The per phase line impedance is 1.7 Ohms. Calculate the sending end voltage. A. 23.79 B. 962.54 C. 31.02 D. 2.89The parameters of a three-phase line 200 km long are resistance/km =0.15 , inductive/km=0.5 and capacitive susceptance/km 2 x 10^6 ohm. The transmission line is delivering 50 MVA at 132 kV with power factor 0.85 lagging. Use nominal T method to determine; 1) sending end voltage 2) sending end current 3) sending end power factor 4) transmission efficiency and 5) voltage regulation.
- 20/ For balanced three phase star connected load, the phase angle difference between VR and VY is 30 degrees. Select one: True FalseA 5 km long 3-phase line has a horizontal configuration of 4 ft. spacing. The conductor is 336.4 MCM with a GMR of 0.0244 ft. and a resistance of 0.306 ohm per mile. What is the impedance? Answer; 2.22 cis 65°In a 3-phase, 4-wire system, the currents in R. Yand B lines under abnormal conditions of trading are as under IR-100 230 A; IY-50 2300 A: IB-30 2180 A Calculate the positive, negative and zero sequence currents in the R-line and return current in the neutral wire.
- A. A 200 km line has a resistance of the line per phase per km is 0.08 ohm, a suceptance per phase per km = 6 x 10°-6 ohm and a reactance per phase per km is 0.8 ohm. Using nominal T method, determine the constant B of the line. A. 153.2 cis 84.6° C. 178.4 cis 81.5° B. 145.2 cis 88.2° D. 169.5 cis 83.6° B) A 132-KV, 50 Hz, 3-phase transmission line delivers a load of 50 MW at 0.8 pf lagging at receiving end. The generalized constant of the line are A = D = 0.95/1.4°; B = 96/7.8°; C= 0.0015/90°. Find the regulation of the line. A. 23.8 %. C. 29.4 % B. 25.6 %. D. 27.1 %solve it asap A 3-phase line having an impedance of (5 + j 20) ohms per phase delivers a load of 30 MW at a p.f. of 0·8 lagging and voltage 33 kV. Determine the capacity of the synchronous condenser required to be installed at the receiving end if voltage at the sending end is to be maintained at 33 kV.l. A single-phase distributor AB has a total impedance 0f (0.1+j0.2) ohms. At the far end B, a current of 80A at 0.8 pf lagging and at mid-point C a current of 100A at 0.6 pf lagging are tapped. If the voltage at B is maintained at 200V, determine the sending end voltage.