Q3. Figure Q3 shows a section of a power system where a generator supplies three identical...
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Q3. Figure Q3 shows a section of a power system where a generator supplies three identical motors over a transmission line with transformers at both ends. The ratings of the generators, transformers and the motor are as shown in the figure. Subtransient reactances are given for the generators and motors. The reactance of the line is 300. A symmetrical three-phase fault occurs at the point F at the terminals of the motor M. Assume that the system is unloaded, and the generator is generating the rated voltage. Select the generator G, ratings as base values. Draw the reactance diagram with all the reactances marked in per unit. Calculate the short circuit current flowing in to the fault in ampere. (1) (ii) 60 MVA 13.8kV X = 20% 11/ 66kV + -0 100MVA X=10% Line 302 Figure 3 66/33kV 0 S 138 100MVA X=10% B 20 MVA 33 kV X" M 25% M CEOM (12 marks) (8 marks) Q3. Figure Q3 shows a section of a power system where a generator supplies three identical motors over a transmission line with transformers at both ends. The ratings of the generators, transformers and the motor are as shown in the figure. Subtransient reactances are given for the generators and motors. The reactance of the line is 300. A symmetrical three-phase fault occurs at the point F at the terminals of the motor M. Assume that the system is unloaded, and the generator is generating the rated voltage. Select the generator G, ratings as base values. Draw the reactance diagram with all the reactances marked in per unit. Calculate the short circuit current flowing in to the fault in ampere. (1) (ii) 60 MVA 13.8kV X = 20% 11/ 66kV + -0 100MVA X=10% Line 302 Figure 3 66/33kV 0 S 138 100MVA X=10% B 20 MVA 33 kV X" M 25% M CEOM (12 marks) (8 marks)
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Materials and process in manufacturing
ISBN: 978-0471656531
9th edition
Authors: E. Paul DeGarmo, J T. Black, Ronald A. Kohser
Posted Date:
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