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A 750 A circuit uses thyristor of current rating 175 A. If derating is 25%, the number of thyristors in parallel is
- a)3
- b)4
- c)6
- d)10
Correct answer is option 'C'. Can you explain this answer?
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A 750 A circuit uses thyristor of current rating 175 A. If derating is...
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A 750 A circuit uses thyristor of current rating 175 A. If derating is...
If the thyristor is derated by 25% means it will have capacity of carrying only 75% current . 75% current means 175*0.75 i.e 131.25 amps. as the thyristor are connected in parallel therefore the no of thyristor = total current /current in each thyristor = 750/131.25
i.e 5.71 or approx 6
i.e 5.71 or approx 6
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A 750 A circuit uses thyristor of current rating 175 A. If derating is...
Given:
Circuit current rating = 750 A
Thyristor current rating = 175 A
Derating = 25%
To find: Number of thyristors in parallel
Explanation:
1. Derating is a technique used to reduce the current rating of a component to ensure its safe operation. In this case, the thyristor's current rating is reduced by 25% due to derating.
2. Derating factor = 1 - (Derating % / 100)
Derating factor = 1 - (25 / 100)
Derating factor = 1 - 0.25
Derating factor = 0.75
3. The total current rating required by the circuit can be calculated by dividing the circuit current rating by the derating factor.
Total current rating = Circuit current rating / Derating factor
Total current rating = 750 A / 0.75
Total current rating = 1000 A
4. To determine the number of thyristors in parallel, divide the total current rating by the thyristor current rating.
Number of thyristors in parallel = Total current rating / Thyristor current rating
Number of thyristors in parallel = 1000 A / 175 A
Number of thyristors in parallel ≈ 5.71
5. The number of thyristors in parallel should be a whole number, so we round the calculated value up to the nearest integer.
Number of thyristors in parallel ≈ 6
Therefore, the correct answer is option C) 6.
Circuit current rating = 750 A
Thyristor current rating = 175 A
Derating = 25%
To find: Number of thyristors in parallel
Explanation:
1. Derating is a technique used to reduce the current rating of a component to ensure its safe operation. In this case, the thyristor's current rating is reduced by 25% due to derating.
2. Derating factor = 1 - (Derating % / 100)
Derating factor = 1 - (25 / 100)
Derating factor = 1 - 0.25
Derating factor = 0.75
3. The total current rating required by the circuit can be calculated by dividing the circuit current rating by the derating factor.
Total current rating = Circuit current rating / Derating factor
Total current rating = 750 A / 0.75
Total current rating = 1000 A
4. To determine the number of thyristors in parallel, divide the total current rating by the thyristor current rating.
Number of thyristors in parallel = Total current rating / Thyristor current rating
Number of thyristors in parallel = 1000 A / 175 A
Number of thyristors in parallel ≈ 5.71
5. The number of thyristors in parallel should be a whole number, so we round the calculated value up to the nearest integer.
Number of thyristors in parallel ≈ 6
Therefore, the correct answer is option C) 6.
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A 750 A circuit uses thyristor of current rating 175 A. If derating is 25%, the number of thyristors in parallel isa)3b)4c)6d)10Correct answer is option 'C'. Can you explain this answer?
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