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Answer :
Final answer:
The pickup value of the current for the overcurrent relay connected to a 400/5 current transformer with a 150% setting is 600 A.
Explanation:
The overcurrent relay setting indicates the percentage of rated primary current above which the relay starts to operate. Given that the current transformer ratio is 400/5 and the relay setting is 150%, we need to first calculate the rated primary current which is 5 A x 150% = 7.5 A.
Then, apply the CT ratio to calculate the pickup value: pickup current = 7.5 A x 400/5 = 600 A. Therefore, the pickup value of the current for the overcurrent relay connected to a 400/5 current transformer with a 150% setting is 600 A.
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