A 10요 'X' kV 1요 102 wer B 102 Balanced System ABC sequence For the above 3-phase system, the load consumes total real power of 6kW at 20A current. Determine: (a) the phase voltage of the Generator, (b) the line currents,
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Q: A 10요 'X' kV 1요 102 B 102 Balanced System) ABC sequence For the above 3-phase system, the load…
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- Figure 3.32 shows the oneline diagram of a three-phase power system. By selecting a common base of 100 MVA and 22 kV on the generator side, draw an impedance diagram showing all impedances including the load impedance in per-unit. The data are given a follows: G:90MVA22kVx=0.18perunitT1:50MVA22/220kVx=0.10perunitT2:40MVA220/11kVx=0.06perunitT3:40MVA22/110kVx=0.064perunitT4:40MVA110/11kVx=0.08perunitM:66.5MVA10.45kVx=0.185perunit Lines I and 2 have series reactances of 48.4 and 65.43, respectively. At bus 4, the three-phase load absorbs 57 MVA at 10.45 kV and 0.6 power factor lagging.It is stated that (i) balanced three-phase circuits can be solved in per unit on a per-phase basis after converting - load impedances to equivalent Y impedances. (ii) Base values can be selected either on a per-phase basis or on a three-phase basis. (a) Both statements are true. (b) Neither is true. (c) Only one of the above is true.One advantage of balanced three-phase systems over separate singlephase systems is reduced capital and operating costs of transmission and distribution. (a) True (b) False
- A balanced, three-phase, positive sequence, with grounded neutral source, supplies power to a balanced delta connected load. For the system, additional information are as follows: Vbc = 211 cis 220 degrees volts; and true power per phase is = 1239 watts, with 0.68 power factor lagging What is the angle of the line current Ib in degrees?Non-Reactive Loads of 10kW, 20kW and 12kW are connected between the neutral and the red, yellow and blue phases respectively of 3-phase, 4 wire . The line voltage is 400. If a three phase motor is now started ,taking 150 A from the lines at a power factor of 0.3 lagging What should be the total current in each line and the neutral wire? Find the total real and reactive power supplied to the loads6) The neutral current in a balanced Y-Y connected three-phase system is equal to zero True False
- A 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.An AC three phase distribution system (given in Figure 2), which has end user with balanced three phase (10A) load, is given in the figure. The phase-neutral voltages of the transformers are given as V1=224V, V2=225V, V3=228V and V4=231V respectively. a) Calculate phase-neutral voltage of the bus-bar (B). b) Calculate currents of the transformers (I1, I2, I3 and I4) c) Calculate phase-neutral voltage of the point K while the output of TR3 and TR4 (xy) have been short circuited for a transient time (transformers are still operational) by the line fault.Consider a 3-phase, 35 kV transformers with N1:N2 = 150:900. Calculate the secondary line voltage on no load if the windings are connected in i) Delta-Star [ ii) Star-Delta
- 6/For a star connected three phase balanced system, ________________ a. None of these b. Phase voltage is equal to square root three times line voltage and phase current is equal to line current c. Phase voltage is equal to line voltage and line current is equal to phase current d. Phase voltage is equal to line voltage and phase current is three times the line currentA balanced, three-phase, positive sequence, with grounded neutral source, supplies power to a balanced delta connected load. For the system, additional information are as follows: Vbn = 465 cis 175 degrees volts; and Ica = 13.7 cis117 degrees amperes What is the magnitude of the impedance per phase of the delta load in ohms?A single phase load is connected across line bc of a three phase supply of 3300 V . If the load is assumed to be 100KVA. What is the correct positive and zero sequence components