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Symmetrical_components_project

# Symmetrical_components_project - BUFFALO STATE COLLEGE...

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BUFFALO STATE COLLEGE DEPARTMENT OF TECHNOLOGY ENT 472 Power Systems II COURSE PROJECT Spring 2010 Name _______________________________ The single-line diagram of a three-phase power system is shown. Equipment ratings are given as follows: Synchronous generators and motors : G1 1000 MVA 15 kV X d = X 2 = 0.18, X 0 = 0.07 pu Y-grounded G2 1000 MVA 15 kV X d = X 2 = 0.20, X 0 = 0.10 pu Y-ungrounded G3 500 MVA 13.8 kV X d = X 2 = 0.15, X 0 = 0.05 pu Y-grounded through reactance G4 750 MVA 13.8 kV X d = 0.30, X 2 = 0.40, X 0 = 0.10 pu Y-ungrounded Transformers (voltages and connections are given for primary, and then secondary sites ) T1 1000 MVA 15 kV / 765 kV X = 0.10 pu Delta -- Y-grounded T2 1000 MVA 15 kV / 765 kV X = 0.10 pu Delta -- Y-grounded T3 500 MVA 15kV / 765 kV X = 0.12 pu Y-ungrounded – Y-grounded T4 750 MVA 15 kV / 765 kV X = 0.11 pu Y-grounded – Y-grounded Transmission Lines 1 - 2 765 kV X 1 = 50 Ohm, X 0 = 150 Ohm 1 - 3 765 kV X 1 = 40 Ohm, X 0 = 100 Ohm 2 - 3 765 kV X 1 = 40 Ohm, X 0 = 100 Ohm The inductor connected to generator 3 neutral has a reactance of 0.05 pu using generator 3 ratings as a base. G1 G2 G3 G4 1 3 2 Line 1 - 3 Line 1- 2 Line 2 - 3

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