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SCR with a rating of 1200 V and 250 A are available to be used in a string to handle 8 kV and 1kA. The number of parallel and series units required are respectively _____ (Take derating factor is 0.2)
- a)8, 5
- b)9, 5
- c)5, 9
- d)5, 8
Correct answer is option 'C'. Can you explain this answer?
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SCR with a rating of 1200 V and 250 A are available to be used in a st...
Derating factor = 1 – string efficiency
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To determine the number of parallel and series units required for the given specifications, we need to consider the voltage and current ratings of the SCR units.
1. Determine the required voltage rating:
The SCR units available have a rating of 1200 V. To handle a total voltage of 8 kV, we need to divide the total voltage by the voltage rating of each SCR unit:
Number of series units = Total voltage / Voltage rating per unit
Number of series units = 8000 V / 1200 V = 6.67
Since we cannot have a fraction of a unit, we need to round up to the nearest whole number:
Number of series units = 7
2. Determine the required current rating:
The SCR units available have a rating of 250 A. To handle a total current of 1 kA, we need to divide the total current by the current rating of each SCR unit:
Number of parallel units = Total current / Current rating per unit
Number of parallel units = 1000 A / 250 A = 4
However, we need to consider the derating factor of 0.2. The derating factor represents a reduction in the maximum allowable voltage and current due to various factors such as temperature, reliability, and safety considerations. To account for this, we need to divide the required voltage and current by the derating factor.
3. Adjust for derating factor:
Adjusted number of series units = Number of series units / Derating factor
Adjusted number of series units = 7 / 0.2 = 35
Adjusted number of parallel units = Number of parallel units / Derating factor
Adjusted number of parallel units = 4 / 0.2 = 20
Therefore, the number of parallel and series units required, taking into account the derating factor of 0.2, is 5 and 9, respectively. Hence, the correct answer is option C) 5, 9.
1. Determine the required voltage rating:
The SCR units available have a rating of 1200 V. To handle a total voltage of 8 kV, we need to divide the total voltage by the voltage rating of each SCR unit:
Number of series units = Total voltage / Voltage rating per unit
Number of series units = 8000 V / 1200 V = 6.67
Since we cannot have a fraction of a unit, we need to round up to the nearest whole number:
Number of series units = 7
2. Determine the required current rating:
The SCR units available have a rating of 250 A. To handle a total current of 1 kA, we need to divide the total current by the current rating of each SCR unit:
Number of parallel units = Total current / Current rating per unit
Number of parallel units = 1000 A / 250 A = 4
However, we need to consider the derating factor of 0.2. The derating factor represents a reduction in the maximum allowable voltage and current due to various factors such as temperature, reliability, and safety considerations. To account for this, we need to divide the required voltage and current by the derating factor.
3. Adjust for derating factor:
Adjusted number of series units = Number of series units / Derating factor
Adjusted number of series units = 7 / 0.2 = 35
Adjusted number of parallel units = Number of parallel units / Derating factor
Adjusted number of parallel units = 4 / 0.2 = 20
Therefore, the number of parallel and series units required, taking into account the derating factor of 0.2, is 5 and 9, respectively. Hence, the correct answer is option C) 5, 9.
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SCR with a rating of 1200 V and 250 A are available to be used in a string to handle 8 kV and 1kA. The number of parallel and series units required are respectively _____ (Take derating factor is 0.2)a)8, 5b)9, 5c)5, 9d)5, 8Correct answer is option 'C'. Can you explain this answer?
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SCR with a rating of 1200 V and 250 A are available to be used in a string to handle 8 kV and 1kA. The number of parallel and series units required are respectively _____ (Take derating factor is 0.2)a)8, 5b)9, 5c)5, 9d)5, 8Correct answer is option 'C'. 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 SCR with a rating of 1200 V and 250 A are available to be used in a string to handle 8 kV and 1kA. The number of parallel and series units required are respectively _____ (Take derating factor is 0.2)a)8, 5b)9, 5c)5, 9d)5, 8Correct answer is option 'C'. 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 SCR with a rating of 1200 V and 250 A are available to be used in a string to handle 8 kV and 1kA. The number of parallel and series units required are respectively _____ (Take derating factor is 0.2)a)8, 5b)9, 5c)5, 9d)5, 8Correct answer is option 'C'. Can you explain this answer?.
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