Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > If the fault current is 2000 A, the.relay set...
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If the fault current is 2000 A, the.relay setting 50% and the CT ratio is 400/5, then the plug setting multiplier will be
- a)15
- b)25
- c)50
- d)None of these
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
If the fault current is 2000 A, the.relay setting 50% and the CT ratio...
Relay operating current,
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If the fault current is 2000 A, the.relay setting 50% and the CT ratio...
Calculation of Plug Setting Multiplier
- The plug setting multiplier (PSM) is a factor that determines the amount of fault current needed to activate a protective relay.
- It is calculated using the following formula:
PSM = (CT ratio x relay setting) / 100
- In this case, the CT ratio is given as 400/5, which means that the current transformer steps down the primary current by a factor of 80.
- The relay setting is given as 50%, which means that the relay will trip when it detects a current that is 50% of its rated current.
- Using the formula, we can calculate the PSM as follows:
PSM = (400/5 x 50) / 100
PSM = 20
- Therefore, the PSM is 20, which means that the relay will trip when it detects a current that is 20 times its rated current.
- Since the fault current is given as 2000 A, the relay will trip if the current exceeds 20 x 2000 = 40,000 A.
- None of the given options (A, B, or C) is correct, as they all represent possible values for the PSM, but not the actual value in this case. The correct answer is option D, which indicates that none of the given options is correct.
- The plug setting multiplier (PSM) is a factor that determines the amount of fault current needed to activate a protective relay.
- It is calculated using the following formula:
PSM = (CT ratio x relay setting) / 100
- In this case, the CT ratio is given as 400/5, which means that the current transformer steps down the primary current by a factor of 80.
- The relay setting is given as 50%, which means that the relay will trip when it detects a current that is 50% of its rated current.
- Using the formula, we can calculate the PSM as follows:
PSM = (400/5 x 50) / 100
PSM = 20
- Therefore, the PSM is 20, which means that the relay will trip when it detects a current that is 20 times its rated current.
- Since the fault current is given as 2000 A, the relay will trip if the current exceeds 20 x 2000 = 40,000 A.
- None of the given options (A, B, or C) is correct, as they all represent possible values for the PSM, but not the actual value in this case. The correct answer is option D, which indicates that none of the given options is correct.
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Community Answer
If the fault current is 2000 A, the.relay setting 50% and the CT ratio...
PSM = fault current / current setting × CT ratio
Calculation:
Given that, fault current = 2000 A
Relay setting = 50 %
CT ratio = 400/5
PSM = 200/0.5×5×400/5 = 10
Calculation:
Given that, fault current = 2000 A
Relay setting = 50 %
CT ratio = 400/5
PSM = 200/0.5×5×400/5 = 10
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