The one-line diagram of a power system is shown in the figure is shown below T Line 1 220 kV G M Line 2 110 kV Load The three-phase power and line to line ratings are as follows G1: 85 MVA 22 kV X = 24% T1: 55 MVA 22/220 kV X = 10% T2: 45 MVA 220/22 kV X = 6% T3: 45 MVA 22/110 kV X = 6.4% Line 1: 220 kV X = 121 2 Line 2: 110 kV X = 42.35 2 M: 70 MVA 20 kV X = 22.5% Load: 10 Mvar 4 kV Delta -Connected capacitors The Three-phase ratings of the three-phase transformer are Primary: Y-connected 40 MAV, 110 kV Secondary: Y-connected 40 MVA, 22kV Tertiary: Delta-connected 15 MVA, 4kV The per phase measured reactance at the terminal of a winding with the second on short-circuited and the third open-circuited are Zps = 9.6% 40 MVA, 110/22 kV Zpt = 7.2% 40 MVA, 110/4 kV Zst = 12% 40 MVA, 22/4 kV Obtain the T-circuit equivalent impedance of the three- winding transformer to the common 100 MVA base. Draw an impedance diagram showing all impedance in pu on a 100 MVA base. Chose 22 kV as the voltage base for the generator

The one-line diagram of a power system is shown in the figure is shown below T Line 1 220 kV G M Line 2 110 kV Load The three-phase power and line to line ratings are as follows G1: 85 MVA 22 kV X = 24% T1: 55 MVA 22/220 kV X = 10% T2: 45 MVA 220/22 kV X = 6% T3: 45 MVA 22/110 kV X = 6.4% Line 1: 220 kV X = 121 2 Line 2: 110 kV X = 42.35 2 M: 70 MVA 20 kV X = 22.5% Load: 10 Mvar 4 kV Delta -Connected capacitors The Three-phase ratings of the three-phase transformer are Primary: Y-connected 40 MAV, 110 kV Secondary: Y-connected 40 MVA, 22kV Tertiary: Delta-connected 15 MVA, 4kV The per phase measured reactance at the terminal of a winding with the second on short-circuited and the third open-circuited are Zps = 9.6% 40 MVA, 110/22 kV Zpt = 7.2% 40 MVA, 110/4 kV Zst = 12% 40 MVA, 22/4 kV Obtain the T-circuit equivalent impedance of the three- winding transformer to the common 100 MVA base. Draw an impedance diagram showing all impedance in pu on a 100 MVA base. Chose 22 kV as the voltage base for the generator

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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