Over current relays have a Standard Inverse operation (SI) [IEC 60255] with a TMS setting of 0.5.
If using the CT Ratio 800/5 A and adjusting the current to 100% The fault current is equal to 5,000 A.
The relay’s tripping time is
A. 0.500 seconds
B. 1.875 seconds
C. 0.945 seconds
D. 3.750 seconds
Show Answer
Answer: B
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