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# Assignment 6 - UNNERSITY OF SASKATCHEWAN Department of...

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Instructor: S.O. Faried UNNERSITY OF SASKATCHEWAN Department of Electrical Engineering EE 342 - Power Systems I Assignment #6 Due date: November 2,2007 October 2007 1. The single-line diagram of an unloaded power system is shown in Figure 1. Reactances of the two sections of the transmission line are shown on the diagram. The generators and transformers are rated as follows: Generator 1 : 20 MVA, 13.8 kV, X; = 0.20 per unit Generator 2: 30 MVA, 18 kV, X; = 0.20 per unit Generator 3 : 30 MVA, 20 kV, xi = 0.20 per unit Transformer T, : 25 MVA, 220Yl13.8A kV, X = 10% Transformer T, : single-phase units, each rated 10 MVA, 12711 8 kV, X = 10% Transformer: T, 35 MVA, 220Yl22Y kV, X = 10% Draw the impedance diagram with all reactances marked in per unit and with letters to indicate points corresponding to the single-line diagram. Choose a base of 50 MVA, 13.8 kV in the circuit of generator 1. e Figure I The ratings of the generators, motors, and transformers of Figure 2 are: Generator 1 : Generator 2: 20 MVA, 1 3.8 kV, X; = 20% 20 MVA, 18 kV, X; = 20% Synchronous motor 3: 30 MVA, 13.8 kV, X; = 20% Three-phase Y-Y transformers: 20

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