a. A 4.16 kV, 3-phase, 60 Hz high resistance system fed from a 10 MVA transformer...

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a. A 4.16 kV, 3-phase, 60 Hz high resistance system fed from a 10 MVA transformer is subjected to a phase 'c' to ground fault. The system capacitance/phase Co= 1.7864 µF. Calculate: i. the distributed per-phase capacitive reactance to ground of the system (2 marks) Maximum resistor rating. (2 marks) the capacitor current in phases 'a' and 'b' under faulted conditions (2 marks) the total capacitive fault current (2 marks) ii. iii. iv. Fault current flowing through the neutral resistor. (2 marks) Value of ground fault current. (2 marks) b. State two advantages and two disadvantages of resistance grounded systems. V. vi. a. A 4.16 kV, 3-phase, 60 Hz high resistance system fed from a 10 MVA transformer is subjected to a phase 'c' to ground fault. The system capacitance/phase Co= 1.7864 µF. Calculate: i. the distributed per-phase capacitive reactance to ground of the system (2 marks) Maximum resistor rating. (2 marks) the capacitor current in phases 'a' and 'b' under faulted conditions (2 marks) the total capacitive fault current (2 marks) ii. iii. iv. Fault current flowing through the neutral resistor. (2 marks) Value of ground fault current. (2 marks) b. State two advantages and two disadvantages of resistance grounded systems. V. vi.

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SOLUTION a Solution i Distributed perphase capacitive reactance to ground of the system Xc 1 2 f Co ... View the full answer