GATE EE 2014 Set 1 — Question 25
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Power Systems → Fault Analysis → Symmetrical Faults
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Question
Three-phase to ground fault takes place at locations and in the system shown in the figure
If the fault takes place at location , then the voltage and the current at bus A are and respectively. If the fault takes place at location , then the voltage and the current at bus A are and respectively. The correct statement about voltages and currents during faults at and is
Correct answer
(C) V_(F1) lags I_(F1) and V_(F2) leads I_(F2)
Solution
For a fault at (located between bus A and bus B), the current at bus A is supplied by generator . Since the transmission path is predominantly inductive, the current lags the bus voltage , which is equivalent to saying leads .
For a fault at (located between generator and bus A), the current at bus A is supplied by generator through the line. Based on the system configuration and the defined direction of at the bus, the voltage lags the current .
Therefore, the correct statement is lags and leads , which corresponds to option (C).
For a fault at (located between generator and bus A), the current at bus A is supplied by generator through the line. Based on the system configuration and the defined direction of at the bus, the voltage lags the current .
Therefore, the correct statement is lags and leads , which corresponds to option (C).
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