Question

As shown below, reactances of the two sections of transmission line are shown on the diagram. The generators and transformers are rated as follows: Generator 1: 20 MVA, 18 kV, X"d = 20% Generator 2: 20 MVA, 18 kV, X"d = 20% Synchronous motor 3: 30 MVA, 13.8 kV, X"d = 20% Three-phase Y-Y transformers: 20 MVA, 138Y/20Y kV, X = 10% Three-phase Y-? transformers: 15 MVA, 138Y/13.8? kV, X = 10% Suppose that the system is unloaded and that the voltage throughout the system is 1.0 per unit (choose a base of 50MVA, 13.8 kV in the 40 Ohm line). If a three-phase short circuit occurs from bus C to ground, find the phasor value of the short-circuit current (in kilo amperes) if each generator is represented by its subtransient reactance.

          As shown below, reactances of the two sections of transmission line are shown on the diagram. The generators and transformers are rated as follows:
Generator 1: 20 MVA, 18 kV, X"d = 20%
Generator 2: 20 MVA, 18 kV, X"d = 20%
Synchronous motor 3: 30 MVA, 13.8 kV, X"d = 20%
Three-phase Y-Y transformers: 20 MVA, 138Y/20Y kV, X = 10%
Three-phase Y-? transformers: 15 MVA, 138Y/13.8? kV, X = 10%
Suppose that the system is unloaded and that the voltage throughout the system is 1.0 per unit (choose a base of 50MVA, 13.8 kV in the 40 Ohm line). If a three-phase short circuit occurs from bus C to ground, find the phasor value of the short-circuit current (in kilo amperes) if each generator is represented by its subtransient reactance.

As shown below, reactances of the two sections of transmission line are shown on the diagram. The generators and transformers are rated as follows:
Generator 1: 20 MVA, 18 kV, X"d = 20%
Generator 2: 20 MVA, 18 kV, X"d = 20%
Synchronous motor 3: 30 MVA, 13.8 kV, X"d = 20%
Three-phase Y-Y transformers: 20 MVA, 138Y/20Y kV, X = 10%
Three-phase Y-? transformers: 15 MVA, 138Y/13.8? kV, X = 10%
Suppose that the system is unloaded and that the voltage throughout the system is 1.0 per unit (choose a base of 50MVA, 13.8 kV in the 40 Ohm line). If a three-phase short circuit occurs from bus C to ground, find the phasor value of the short-circuit current (in kilo amperes) if each generator is represented by its subtransient reactance.

Added by Robin B.

Question

Please give Ace some feedback