The one-line diagram of a power system is shown in the figure below. The 3-ph load is composed of three 4.8-N capacitors in delta connection. The motor draws 50 MW, 0.6 power factor lagging at 20 kV. Use a base of 100 MVA, 20 kV in the generator circuit. Determine the generator and motor internal emfs and the transmission line current. Line M 3-ph Load The three-phase power and line-line ratings are given below: X = 24% X = 6.4% X = 42.35 Q X = 22.5% G:80 MVA 22 kV 22/110 kV 110 kV T1:40 MVA Line: M: 68.85 MVA 20kV The three-phase ratings of the three-winding transformer T2 are: Y-connected 110 kV Primary: Secondary: Tertiary: 40 MVA, 25 MVA, Y-connected 22 kV A-connected 15 MVA, 4.4 kV Neglecting resistance, the leakage impedances are: Zps = 9.6% Zpt = 7.2% Zst = 10% 40 MVA, 40 MVA, 25 MVA, 110 kV 110 kV 22 kV

The one-line diagram of a power system is shown in the figure below. The 3-ph load is composed of three 4.8-N capacitors in delta connection. The motor draws 50 MW, 0.6 power factor lagging at 20 kV. Use a base of 100 MVA, 20 kV in the generator circuit. Determine the generator and motor internal emfs and the transmission line current. Line M 3-ph Load The three-phase power and line-line ratings are given below: X = 24% X = 6.4% X = 42.35 Q X = 22.5% G:80 MVA 22 kV 22/110 kV 110 kV T1:40 MVA Line: M: 68.85 MVA 20kV The three-phase ratings of the three-winding transformer T2 are: Y-connected 110 kV Primary: Secondary: Tertiary: 40 MVA, 25 MVA, Y-connected 22 kV A-connected 15 MVA, 4.4 kV Neglecting resistance, the leakage impedances are: Zps = 9.6% Zpt = 7.2% Zst = 10% 40 MVA, 40 MVA, 25 MVA, 110 kV 110 kV 22 kV

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 3.25P: Consider a single-phase electric system shown in Figure 3.33. Transformers are rated as follows:...

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Consider a single-phase electric system shown in Figure 3.33. Transformers are rated as follows: XY15MVA,13.8/138kV, leakage reactance 10 YZ15MVA,138/69kV, leakage reactance 8 With the base in circuit Y chosen as 15MVA,138kV determine the per-unit impedance of the 500 resistive load in circuit Z, referred to circuits Z, Y, and X. Neglecting magnetizing currents, transformer resistances, and line impedances, draw the impedance diagram in per unit.
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