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Answer :
Final answer:
The plug setting multiplier (PSM) of a relay given a fault current of 2kA, relay setting of 50, and a CT ratio of 400/5 is calculated to be 0.04.
Explanation:
The question is related to calculating the plug setting multiplier (PSM) of a relay in an electrical system. To find the PSM, we use the formula:
PSM = Fault Current (secondary side) / (CT ratio * Relay setting)
Given the fault current is 2kA, the relay setting is 50, and the CT (current transformer) ratio is 400/5, we can convert the primary fault current to the secondary side of the CT before applying the formula:
Fault current on the secondary side = Fault Current (primary side) / CT ratio
Fault current on the secondary side = 2000 A (2kA) / (400/5)
Fault current on the secondary side = 2000 A * 5 / 400
Fault current on the secondary side = 10 A
Now, we will calculate the PSM:
PSM = 10 A / (5 A * 50)
PSM = 10 A / 250 A
PSM = 0.04
Therefore, the plug setting multiplier of the relay is 0.04.
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