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Figure Q1 shows a single-line diagram of an 8-bus system. Line-1 and Line-2 have reactance 10 Q and 15 2, respectively. The data of generator, transformers, and motor are given in Table Q1(a). The three-phase Load-1 at bus-4 absorbs 35 MVA, 0.7 lagging at 11 kV, while the three- phase Load-2 at bus-8 absorbs 15 MVA, 0.8 lagging at 11kV. a) Sketch an impedance diagram with all impedances including the load impedance marked in per-unit. Select a common base of 100 MVA and 23kV on the generator.

Figure Q1 shows a single-line diagram of an 8-bus system. Line-1 and Line-2 have reactance 10 Q and 15 2, respectively. The data of generator, transformers, and motor are given in Table Q1(a). The three-phase Load-1 at bus-4 absorbs 35 MVA, 0.7 lagging at 11 kV, while the three- phase Load-2 at bus-8 absorbs 15 MVA, 0.8 lagging at 11kV. a) Sketch an impedance diagram with all impedances including the load impedance marked in per-unit. Select a common base of 100 MVA and 23kV on the generator.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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QUESTION 1 Figure Q1 shows a single-line diagram of an 8-bus system. Line-1 and Line-2 have reactance 10 Q and 15 2, respectively. The data of generator, transformers, and motor are given in Table Q1(a). The three-phase Load-1 at bus-4 absorbs 35 MVA, 0.7 lagging at 11 kV, while the three- phase Load-2 at bus-8 absorbs 15 MVA, 0.8 lagging a) Sketch an impedance diagram with all impedances including the load impedance marked in per-unit. Select a common base of 100 MVA and 23kV on the generator. b) The motor on the Figure Q1 operates at 36.28MVA on a lagging power factor 0.9 at a terminal voltage of 10.45 kV. Determine the voltage at bus-5 in per-unit and kV. c) Evaluate the voltage obtained in Question (b) either at the acceptable voltage range or not? You may use Table Q1(b) as reference.
Transcribed Image Text:QUESTION 1 Figure Q1 shows a single-line diagram of an 8-bus system. Line-1 and Line-2 have reactance 10 Q and 15 2, respectively. The data of generator, transformers, and motor are given in Table Q1(a). The three-phase Load-1 at bus-4 absorbs 35 MVA, 0.7 lagging at 11 kV, while the three- phase Load-2 at bus-8 absorbs 15 MVA, 0.8 lagging a) Sketch an impedance diagram with all impedances including the load impedance marked in per-unit. Select a common base of 100 MVA and 23kV on the generator. b) The motor on the Figure Q1 operates at 36.28MVA on a lagging power factor 0.9 at a terminal voltage of 10.45 kV. Determine the voltage at bus-5 in per-unit and kV. c) Evaluate the voltage obtained in Question (b) either at the acceptable voltage range or not? You may use Table Q1(b) as reference.
Bus-1 Т-1 Т-2у Т-3) Bus-2 Bus-5 Bus-8 %3l Load-2 Line-1 Line-2 Bus-3 Bus-6 Т-4 Т-5 Bus-4 Bus-7. Load-1 M Figure Q1: Single-line diagram of an 8-bus system Table Q1(a): Parameters of generator, transformers, and motor Х(%) S(MVA) 100 V(kV) Generator, G Transformer 1 (T-1) Transformer 2 (T-2) Transformer 3 (T-3) Transformer 4 (T-4) 22 15 50 22/275 50 22/132 5 20 22/11 10 40 275/11 7 Transformer 5 (T-5) Motor, M 40 132/11 30 10.45 18 Table Q1(b): Steady -state voltage level regulation limits under normal conditions Voltage Level % Variation -6 % & + 10 % +/- 5% 400V and 230V 6.6kV, 11kV, 22kV, 33kV 132kV and 275kV +/- 5% 500kV +/- 5%
Transcribed Image Text:Bus-1 Т-1 Т-2у Т-3) Bus-2 Bus-5 Bus-8 %3l Load-2 Line-1 Line-2 Bus-3 Bus-6 Т-4 Т-5 Bus-4 Bus-7. Load-1 M Figure Q1: Single-line diagram of an 8-bus system Table Q1(a): Parameters of generator, transformers, and motor Х(%) S(MVA) 100 V(kV) Generator, G Transformer 1 (T-1) Transformer 2 (T-2) Transformer 3 (T-3) Transformer 4 (T-4) 22 15 50 22/275 50 22/132 5 20 22/11 10 40 275/11 7 Transformer 5 (T-5) Motor, M 40 132/11 30 10.45 18 Table Q1(b): Steady -state voltage level regulation limits under normal conditions Voltage Level % Variation -6 % & + 10 % +/- 5% 400V and 230V 6.6kV, 11kV, 22kV, 33kV 132kV and 275kV +/- 5% 500kV +/- 5%
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