1 (a) Explain the advantages of per-unit system and derive the fundamental relations between the actual value and per-unit value on chosen base values for a three phase system. (b) A 3-phase 10 MVA, 6.6 kV alternator with a reactance of 10 % is connected to a feeder of series impedance (1.2 +j 4.8) ohms/phase/km. The transformer is rated at 6 MVA, 6.6 kV/33 kV and has a reactance of 8 %. Determine the fault current supplied by the generator operating under no load with a voltage of 6.9 kV, when a 3-phase symmetrical fault occurs at a point 10 km along the feeder. Include all necessary diagrams.

1 (a) Explain the advantages of per-unit system and derive the fundamental relations between the actual value and per-unit value on chosen base values for a three phase system. (b) A 3-phase 10 MVA, 6.6 kV alternator with a reactance of 10 % is connected to a feeder of series impedance (1.2 +j 4.8) ohms/phase/km. The transformer is rated at 6 MVA, 6.6 kV/33 kV and has a reactance of 8 %. Determine the fault current supplied by the generator operating under no load with a voltage of 6.9 kV, when a 3-phase symmetrical fault occurs at a point 10 km along the feeder. Include all necessary diagrams.

Practical Management Science

6th Edition

ISBN:9781337406659

Author:WINSTON, Wayne L.

Publisher:WINSTON, Wayne L.

Chapter10: Introduction To Simulation Modeling

Section: Chapter Questions

Problem 41P: At the beginning of each week, a machine is in one of four conditions: 1 = excellent; 2 = good; 3 =...

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