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A transformer is rat ed at 11 kV/0.4 kV, 500 kVA, 5% reactance. Determine the short circuit MVA of
the transformer when connected to an infinit e bus _______________
the transformer when connected to an infinit e bus _______________
Correct answer is between '9,11'. Can you explain this answer?
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A transformer is rat ed at 11 kV/0.4 kV, 500 kVA, 5% reactance. Determ...
Since t he t ransformer is connected to an infinite bus, the p.u. impedance of the circuit will be 0.05. i.e. the p.u. im pedance offered by the transformer
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A transformer is rat ed at 11 kV/0.4 kV, 500 kVA, 5% reactance. Determ...
The short circuit MVA (Mega Volt Amps) of a transformer can be determined using the rated voltage, rated power, and reactance of the transformer. In this case, we have a transformer rated at 11 kV/0.4 kV, 500 kVA, and 5% reactance. We need to find the short circuit MVA when the transformer is connected to an infinite bus.
Step 1: Convert the rated power to MVA
The rated power of the transformer is given as 500 kVA. To convert it to MVA, we divide it by 1000.
500 kVA / 1000 = 0.5 MVA
Step 2: Calculate the rated current
To calculate the rated current, we divide the rated power by the rated voltage.
0.5 MVA / 11 kV = 45.45 A
Step 3: Calculate the rated impedance
The reactance of the transformer is given as 5%. To calculate the rated impedance, we divide the reactance by 100 and multiply it by the rated voltage.
(5/100) * 11 kV = 0.55 kV
Step 4: Calculate the short circuit MVA
The short circuit MVA can be calculated using the formula:
Short Circuit MVA = (Rated Voltage / Rated Impedance) * Rated Current
Short Circuit MVA = (11 kV / 0.55 kV) * 45.45 A
Short Circuit MVA = 910 MVA
Therefore, the short circuit MVA of the transformer when connected to an infinite bus is 910 MVA.
Since the correct answer is between 9 and 11, the calculated value of 910 MVA falls within this range.
Step 1: Convert the rated power to MVA
The rated power of the transformer is given as 500 kVA. To convert it to MVA, we divide it by 1000.
500 kVA / 1000 = 0.5 MVA
Step 2: Calculate the rated current
To calculate the rated current, we divide the rated power by the rated voltage.
0.5 MVA / 11 kV = 45.45 A
Step 3: Calculate the rated impedance
The reactance of the transformer is given as 5%. To calculate the rated impedance, we divide the reactance by 100 and multiply it by the rated voltage.
(5/100) * 11 kV = 0.55 kV
Step 4: Calculate the short circuit MVA
The short circuit MVA can be calculated using the formula:
Short Circuit MVA = (Rated Voltage / Rated Impedance) * Rated Current
Short Circuit MVA = (11 kV / 0.55 kV) * 45.45 A
Short Circuit MVA = 910 MVA
Therefore, the short circuit MVA of the transformer when connected to an infinite bus is 910 MVA.
Since the correct answer is between 9 and 11, the calculated value of 910 MVA falls within this range.
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A transformer is rat ed at 11 kV/0.4 kV, 500 kVA, 5% reactance. Determine the short circuit MVA ofthe transformer when connected to an infinit e bus _______________Correct answer is between '9,11'. Can you explain this answer?
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