GATE EE 2020 Set 1 — Question 59
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Electrical Machines → Fault Analysis → Cylindrical & Salient Pole
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Question
A cylindrical rotor synchronous generator has steady state synchronous reactance of and subtransient reactance of . It is operating at terminal voltage with an internal emf of . Following a three-phase solid short circuit fault at the terminal of the generator, the magnitude of the subtransient internal emf (rounded off to 2 decimal places) is ________ pu.
Correct answer
1.01 to 1.03
Solution
Given:
Steady state synchronous reactance
Subtransient reactance
Terminal voltage
Internal emf Step 1: Calculate the pre-fault current .
Step 2: Calculate the subtransient internal emf .
Step 3: Calculate the magnitude of .
Rounding off to 2 decimal places, we get .
Steady state synchronous reactance
Subtransient reactance
Terminal voltage
Internal emf Step 1: Calculate the pre-fault current .
Step 2: Calculate the subtransient internal emf .
Step 3: Calculate the magnitude of .
Rounding off to 2 decimal places, we get .
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