For the balanced, three phase network shown below assume that all data is per unit on a 100 MVA base except for the transmission line reactance. Assume a 13.8 kV voltage base for the generator and motor, and a 138 kV voltage base for the transmission line.

a) If the system is initially operating unloaded with all voltages at 1.0 per unit, what is the magnitude of the fault current (in amps) if a balanced, three phase fault occurs on the terminal of the motor. You should neglect the dc offset current.

b) During the fault from part a, what is the per unit voltage magnitude on the terminal of the generator?


a)



b)

Trades & Technology

You might also like to view...

A movie shot at 30 frames per second shows a moving wagon having wheels that appear not to be rotating. The minimum rotational speed that produces this aliasing is ______ revolutions per second.

Fill in the blank(s) with the appropriate word(s).

Trades & Technology

_____ is not suitable for grapes

A) Hard pot B) Hardpan C) Loam D) Moderate amount of organic matter

Trades & Technology

Pipe cutters differ from tube cutters in that they _____

a. can be operated with or without a stand b. are heavier c. require more than one person to operate d. are smaller

Trades & Technology

Two technicians are discussing a power window that travels up and down very slowly. Technician A says that unwanted resistance in the wiring to the power window motor could cause this. Technician B says that a short to ground in the wiring to the motor could be the cause. Who is correct?

A. Technician A only B. Technician B only C. Both Technicians A and B D. Neither Technician A nor B

Trades & Technology