3) The single-line diagram of a three-phase system is given in Figure 3. The three-phase generator is rated 4160 kVA, 2.4 kV, and 1000 A. The three-phase transformer T1 is rated 6000 kVA, 2.4Y/24Y kV, with leakage reactance of 0.04 pu. Transformer T2 is made up of three single-phase transformers and is rated 4000 kVA, 24Y/12Y kV, with leakage reactance of 0.04 pu. The load draws 2000KVA with 0.8 PF leading at 12kV. Assume that the line length between the two transformers is negligible. Select a base power value and base voltages DIFFERENT than the ratings of the equipment. Determine the following for all three circuits, 2.4-, 24-, and 12-kV circuits: (a) Base impedance values (b) Base current values (c) Per-unit and actual current values (neglect magnetizing currents in transformers and charging currents in lines) (d) Per-unit and actual voltage values at buses 1, 2, and 4 (e) Per-unit and actual apparent power values at buses 1, 2, and 4 24 kV N1 N2 2.4 kV 24 kV 12 kV N2 N1 Load T1 T2 Figure 3
3) The single-line diagram of a three-phase system is given in Figure 3. The three-phase generator is rated 4160 kVA, 2.4 kV, and 1000 A. The three-phase transformer T1 is rated 6000 kVA, 2.4Y/24Y kV, with leakage reactance of 0.04 pu. Transformer T2 is made up of three single-phase transformers and is rated 4000 kVA, 24Y/12Y kV, with leakage reactance of 0.04 pu. The load draws 2000KVA with 0.8 PF leading at 12kV. Assume that the line length between the two transformers is negligible. Select a base power value and base voltages DIFFERENT than the ratings of the equipment. Determine the following for all three circuits, 2.4-, 24-, and 12-kV circuits: (a) Base impedance values (b) Base current values (c) Per-unit and actual current values (neglect magnetizing currents in transformers and charging currents in lines) (d) Per-unit and actual voltage values at buses 1, 2, and 4 (e) Per-unit and actual apparent power values at buses 1, 2, and 4 24 kV N1 N2 2.4 kV 24 kV 12 kV N2 N1 Load T1 T2 Figure 3
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 3.37P: Three single-phase two-winding transformers, each rated 25MVA,54.2/5.42kV, are connected to form a...
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