GATE EE 2016 Set 1 — Question 30
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Power Systems → Fault Analysis → Symmetrical Faults
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Question
The magnitude of three-phase fault currents at buses A and B of a power system are 10 pu and 8 pu, respectively. Neglect all resistances in the system and consider the pre-fault system to be unloaded. The pre-fault voltage at all buses in the system is 1.0 pu. The voltage magnitude at bus B during a three-phase fault at bus A is 0.8 pu. The voltage magnitude at bus A during a three-phase fault at bus B, in pu, is ________.
Correct answer
0.83 to 0.85
Solution
Given:
pu
puStep 2: Find the transfer impedance using the voltage at bus B during a fault at bus A.
puStep 3: Find the voltage at bus A during a fault at bus B ().
By reciprocity, pu.
pu.The calculated value is 0.84, which falls within the specified range of 0.83 to 0.85.
- Pre-fault voltage pu
- Fault current at bus A, pu
- Fault current at bus B, pu
- Voltage at bus B during fault at A, pu
pu
puStep 2: Find the transfer impedance using the voltage at bus B during a fault at bus A.
puStep 3: Find the voltage at bus A during a fault at bus B ().
By reciprocity, pu.
pu.The calculated value is 0.84, which falls within the specified range of 0.83 to 0.85.
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