Once direction of rotation with a known sequence is found, the motor may be used thereafter for determining an unknown sequence. Tutorial Problem No. 19.3 1. Three impedances Z₁, Z, and Z, are mesh-connected to a symmetrical 3-phase, 400-V, 50-Hz supply of phase sequence R→Y→ B. Z₁ = (10 + j0) ohm- between R and Y lines Z₁ = (5 + j6) ohm between Y and B lines between B and R lines Z₂ = (5-j5) ohm Calculate the phase and line currents and total power consumed. [40 A, 40 A, 56.6 A; 95.7 A, 78.4 A, 35.2 A; 44.8 kW] 2. A symmetrical 3-6, 380-V supply feeds a mesh-connected load as follows: Load A: 19 KVA at p.f. 0.5 lag; Load B: 20 kVA at p.f. 0.8 lag: Load C: 10 kVA at p.f. 0.9 load Determine the line currents and their phase angles for RYB sequence. [74.6 Z-51° A, 98.6 Z172.7° A; 68.3 Z41.8º A] 3. Determine the line currents in an unbalanced Y connected load supplied from a symmetrical 3-0, 440-V, 3-wire system. The branch impedances of the load are: Z₁ = 5 < 30° ohm, Z₂ = 10 Z 45° ohm and Z₂ = 10 45° ohm and Z₁ = 10 Z60° ohm. The sequence is RYB. [35.7 A, 32.8 A; 27.7 A] 4. A 3-0, Y-connected alternator supplies an unbalanced load consisting of three impedances (10 + j20), (10 j20) and 102 respectively, connected in star. There is no neutral connection. Calculate the voltage between the star point of the alternator and that of the load. The phase voltage of the alternator is 230 V. [-245.2 V] 5. Non-reactive resistors of 10, 20 and 25 2 are star-connected to the R, Y are B phases of a 400-V, symmetrical system. Determine the current and power in each resistor and the voltage between star point and neutral. Phase sequence, RYB. [16.5 A, 2.72 kW; 13.1 A, 3.43 kW; 11.2 A, 3.14 kW ; 68 V] 6. Determine the line current in an unbalanced, star-connected load supplied from a symmetrical 3- phase, 440-V system. The branch impedance of the load are Z₁ = 5 ≤ 30° 2, Z₂ = 10245° 2 and Z= 10/60° 0 The ph no is PYR 1357 A 32 8 A
Once direction of rotation with a known sequence is found, the motor may be used thereafter for determining an unknown sequence. Tutorial Problem No. 19.3 1. Three impedances Z₁, Z, and Z, are mesh-connected to a symmetrical 3-phase, 400-V, 50-Hz supply of phase sequence R→Y→ B. Z₁ = (10 + j0) ohm- between R and Y lines Z₁ = (5 + j6) ohm between Y and B lines between B and R lines Z₂ = (5-j5) ohm Calculate the phase and line currents and total power consumed. [40 A, 40 A, 56.6 A; 95.7 A, 78.4 A, 35.2 A; 44.8 kW] 2. A symmetrical 3-6, 380-V supply feeds a mesh-connected load as follows: Load A: 19 KVA at p.f. 0.5 lag; Load B: 20 kVA at p.f. 0.8 lag: Load C: 10 kVA at p.f. 0.9 load Determine the line currents and their phase angles for RYB sequence. [74.6 Z-51° A, 98.6 Z172.7° A; 68.3 Z41.8º A] 3. Determine the line currents in an unbalanced Y connected load supplied from a symmetrical 3-0, 440-V, 3-wire system. The branch impedances of the load are: Z₁ = 5 < 30° ohm, Z₂ = 10 Z 45° ohm and Z₂ = 10 45° ohm and Z₁ = 10 Z60° ohm. The sequence is RYB. [35.7 A, 32.8 A; 27.7 A] 4. A 3-0, Y-connected alternator supplies an unbalanced load consisting of three impedances (10 + j20), (10 j20) and 102 respectively, connected in star. There is no neutral connection. Calculate the voltage between the star point of the alternator and that of the load. The phase voltage of the alternator is 230 V. [-245.2 V] 5. Non-reactive resistors of 10, 20 and 25 2 are star-connected to the R, Y are B phases of a 400-V, symmetrical system. Determine the current and power in each resistor and the voltage between star point and neutral. Phase sequence, RYB. [16.5 A, 2.72 kW; 13.1 A, 3.43 kW; 11.2 A, 3.14 kW ; 68 V] 6. Determine the line current in an unbalanced, star-connected load supplied from a symmetrical 3- phase, 440-V system. The branch impedance of the load are Z₁ = 5 ≤ 30° 2, Z₂ = 10245° 2 and Z= 10/60° 0 The ph no is PYR 1357 A 32 8 A
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter3: Power Transformers
Section: Chapter Questions
Problem 3.30P: Reconsider Problem 3.29. If Va,VbandVc are a negative-sequence set, how would the voltage and...
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