1. Three-phase Circuits Given that V110/30" V, find Van and Ven assuming a positive (abc) sequence.
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- An overhead 3-phase transmission line delivers 1200KW at 22KV at 0.8 power factor lagging. The length of the line is 25 Km . The resistance and reactance of conductor are 0.25ohm per Km and 0.30ohm per Km. Determine: 1) Sending end voltage 2) Percentage regulations 3) Sending end power factor 4) Transmission efficiencya 400-v, 50hz, 3-phase supply has 100 ohms connected between lines A & B, 318 mH connected between lines B and C and 31.8uF connected between lines C and A. Find the current in line C, assume a phase sequence ABC.(a) For the three-phase system shown below, find all the line and phase voltages and all the line and phase currents assuming abc sequence. (b) Find the total complex power. Show complete solution. Round off to 4 decimal places.
- An overhead 3-phase transmission line delivers 1200 kW at 22 kV at 0.8 power factor lagging. The length of the line is 25 km. The resistance and reactance of conductor are 0.25 Ω per km and 0.30 Ω per km. Determine, i) Sending end voltage ii) Percentage regulation iii) Sending end power factor iv) Transmission efficiencyA Y-Y three-phase circuit is shown below. Solve for the following: Line current of phase b = ? A Average power delivered to the load = ? WA three-phase overhead line has a load of 30MW, the line voltage is 33kV and power factor is 0.85 lagging. The receiving end has a synchronous compensator, 33kV is maintained at both ends of the line. (i)Calculate the MVAr of the compensator given that the line resistance is 6.5Ω per phase and inductance reactance is 39Ωper phase. (ii)Repeat your calculation using the short-circuit current at node method. Compare and explain the difference between the results.
- The input power to a 3-phase load is measured as 11kw. If the line current and power factor of the load are 32 A and 0.7, then the value of line voltage is given by,?Question 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 DistributionIn a 3-phase star connected system, prove that VL =square root of 3 Vph , by considering the line voltage (VBR = VB - VR ) with the help of necessary phasor diagram.
- a single phase transmission line is delivering 500kva load at 2kV It resistance 0.2ohm and inductive reactance 0.4ohm. Determine voltage regulation if the load power factor is 0.707 laggingdelta-connected circuit having a load of resistance 12Ω and 31.83mH in series issupplied by 3 , 40030 V, 60Hz. Find the line currents assuming abc phasesequenceA single phase transmission line is delivering 490 kVA load at 14 kV. Its resistance is 6 Ω and inductive reactance is 7 Ω if the load power factor is 0.7 lagging. Determine the: A) Current through the line. B) Sending end voltage. C) Sending end power factor. D) Regulation of transmission line. E) Efficiency of transmission line.