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Five alternators each rated 5 MVA, 13.2 kV with 25% of reactance on its own base are connected in parallel to a busbar. The short-circuit level in MVA at the busbar is ___________.
Correct answer is '100 MVA'. Can you explain this answer?
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Five alternators each rated 5 MVA, 13.2 kV with 25% of reactance on it...
Net reactance of generator
Short Circuit MVA = ISC ×Base MVA = 20 × 5 = 100 MVA
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Five alternators each rated 5 MVA, 13.2 kV with 25% of reactance on it...
The short-circuit level at the busbar can be calculated by considering the contribution of each alternator. Let's break down the calculation step by step:
1. Reactance Calculation:
First, we need to calculate the reactance of each alternator on its own base. Given that each alternator has a reactance of 25% on its own base, we can calculate it as follows:
Reactance = 5 MVA * (25/100) = 1.25 MVA
2. Total Reactance Calculation:
Since all five alternators are connected in parallel, the total reactance can be calculated by adding the individual reactances:
Total Reactance = 1.25 MVA + 1.25 MVA + 1.25 MVA + 1.25 MVA + 1.25 MVA = 6.25 MVA
3. Short-Circuit Level Calculation:
The short-circuit level at the busbar is equal to the sum of the MVA ratings of all the alternators. Given that each alternator is rated at 5 MVA, the total short-circuit level can be calculated as follows:
Short-Circuit Level = 5 MVA + 5 MVA + 5 MVA + 5 MVA + 5 MVA = 25 MVA
However, it is important to note that the short-circuit level is not affected by the reactance of the alternators. The reactance only affects the voltage drop and power transfer during normal operation, but it does not impact the short-circuit level.
Therefore, the correct short-circuit level at the busbar is 25 MVA, not 100 MVA as mentioned in the question. It appears that there might be an error in the given correct answer.
1. Reactance Calculation:
First, we need to calculate the reactance of each alternator on its own base. Given that each alternator has a reactance of 25% on its own base, we can calculate it as follows:
Reactance = 5 MVA * (25/100) = 1.25 MVA
2. Total Reactance Calculation:
Since all five alternators are connected in parallel, the total reactance can be calculated by adding the individual reactances:
Total Reactance = 1.25 MVA + 1.25 MVA + 1.25 MVA + 1.25 MVA + 1.25 MVA = 6.25 MVA
3. Short-Circuit Level Calculation:
The short-circuit level at the busbar is equal to the sum of the MVA ratings of all the alternators. Given that each alternator is rated at 5 MVA, the total short-circuit level can be calculated as follows:
Short-Circuit Level = 5 MVA + 5 MVA + 5 MVA + 5 MVA + 5 MVA = 25 MVA
However, it is important to note that the short-circuit level is not affected by the reactance of the alternators. The reactance only affects the voltage drop and power transfer during normal operation, but it does not impact the short-circuit level.
Therefore, the correct short-circuit level at the busbar is 25 MVA, not 100 MVA as mentioned in the question. It appears that there might be an error in the given correct answer.
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Five alternators each rated 5 MVA, 13.2 kV with 25% of reactance on its own base are connected in parallel to a busbar. The short-circuit level in MVA at the busbar is ___________.Correct answer is '100 MVA'. Can you explain this answer?
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Five alternators each rated 5 MVA, 13.2 kV with 25% of reactance on its own base are connected in parallel to a busbar. The short-circuit level in MVA at the busbar is ___________.Correct answer is '100 MVA'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about Five alternators each rated 5 MVA, 13.2 kV with 25% of reactance on its own base are connected in parallel to a busbar. The short-circuit level in MVA at the busbar is ___________.Correct answer is '100 MVA'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Five alternators each rated 5 MVA, 13.2 kV with 25% of reactance on its own base are connected in parallel to a busbar. The short-circuit level in MVA at the busbar is ___________.Correct answer is '100 MVA'. Can you explain this answer?.
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