Figure Q1 shows the one-line diagram of a three-phase power system. By selecting a common base of 25 MVA and 13.8 kV on the generator side. i) ii) iii) Draw an impedance diagram of the power showing all impedances in p.u. Calculate the motor current in p.u. Calculate the motor current in Amperes. G TE bus 1 25 MVA 13.8 kV 15% KA 25 MVA 13.2/69 kV 11% j65 Q Figure Q1 bus 2 ∞+M AR 25 MVA 69/13.2 kV 11% T 15 MVA 13 kV 15%

Figure Q1 shows the one-line diagram of a three-phase power system. By selecting a common base of 25 MVA and 13.8 kV on the generator side. i) ii) iii) Draw an impedance diagram of the power showing all impedances in p.u. Calculate the motor current in p.u. Calculate the motor current in Amperes. G TE bus 1 25 MVA 13.8 kV 15% KA 25 MVA 13.2/69 kV 11% j65 Q Figure Q1 bus 2 ∞+M AR 25 MVA 69/13.2 kV 11% T 15 MVA 13 kV 15%

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 3.23P: Figure 3.32 shows the oneline diagram of a three-phase power system. By selecting a common base of...

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While the instantaneous electric power delivered by a single-phase generator under balanced steady-state conditions is a function of time havi ng two components of a constant and a double-frequency sinusoid, the total instantaneous electric power delivered by a three-phase generator under balanced steady-state conditions is a constant. (a) True (b) False
Consider a three-phase generator rated 300MVA,23kV, supplying a system load of 240 MA and 0.9 power factor lagging at 230 kV through a 330MVA,23/230Y-kV step-up transformer with a leakage reactance of 0.11 per unit. (a) Neglecting the exciting current and choosing base values at the load of 100 MVL and 230 kV. Find the phasor currents IA,IB, and IC supplied to the load in per unit. (b) By choosing the load terminal voltage IA as reference, specify the proper base for the generator circuit and determine the generator voltage V as well as the phasor currents IA,IB, and IC, from the generator. (Note: Take into account the phase shift of the transformer.) (C) Find the generator terminal voltage in kV and the real power supplied by the generator in MW. (d) By omitting the transformer phase shift altogether, check to see whether you get the same magnitude of generator terminal voltage and real power delivered by the generator.
PowerWorid Simulator case Problem 3_60 duplicates Example 3.13 except that a resistance term of 0.06 per unit has been added to the transformer and 0.05 per unit to the transmission line. Since the system is no longer lossless, a field showing the real power losses has also been added to the oneline. With the LTC tap fixed at 1.05, plot the real power losses as the phase shift angle is varied from 10 to +10 degrees. What value of phase shift minimizes the system losses?
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.
Determine the bus admittance matrix (Ybus) for the three-phase power system shown in Figure 6.23 with input data given in Table 6.11 and partial results in Table 6.12. Assume a three-phase 100 MVA per unit base. TABLE 6.11 Bus input data for Problem 6.20 TABLE 6.12 Partially Completed Bus Admittance Matrix (Ybus) for Problem 6.30
Three zones of a single-phase circuit are identified in the figure with a generator voltage specification of 240 V. The zones are connected by the transformers T1 and T2, whose ratings are shown below.Using base values of 30 kVA and 240 volts in zone 1, draw the pu circuit and determine the pu impedance and pu source voltage. Then calculate the load current in pu and in amperes.*Round the final answer to four decimal places, polar form, and label it with the correct units.
In the above figure, a single line model of a three-phase power system is given. Base power 50MVA, base voltage 13.8kV according to its value, a) Per-unit values of power system circuit elements according to the given base power and base voltage values. calculate. b) The perunit you calculate by drawing the equivalent impedance circuit for one phase of the power system given in the figure. show on the values.
A 6,600V, 1,200 kVA, 3-phase alternator is delivering full load at 0.80 power factor lagging. Its reactance is 25% and resistance is negligible. By changing its excitation, the emf is increased by 30%. At this load, determine the new current and power factor. Draw the single line diagram.
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A 3-phase, Y-connected, 60 Hz, 4.2 MVA, 13.2kV synchronous generator has a synchronous reactance of 0.9 ohms and negligible resistance. It supplies a constant power load at rated conditions at 0.92 pf lagging. At the load, the line current lags the line-to-neutral voltage by how many degrees?
Sketch the complete per-phase equivalent circuit of a symmetrical non-salient pole three-phase synchronous generator, including the field winding circuit. Your figure should include the synchronous reactance Xs, explain its relation to Xar and Xl. In addition, explain/describe the rest of the different elements of this equivalent circuit.
2.2. The figure below shows a radial transmission system with a generator having a per-unit voltage of 1.3 at an angle of 9 degree p.u. The load demand is 47MW at a power factor of 0.96lagging. Use the nameplate values of Transformer 2 as base values and calculate the following: Correct answers to three decimal places : 25..Per unit impedance of transformer and it's angle 26.Per unit voltage of the line and its angle 27.Per unit impedance of the line and its angle. And Reactance of the transmission line when the load consumes full-load (Ω).