The Radial System distribution system, as shown, requires both relays to have a Standard Inverse (SI) operation curve according to IEC 60255.
If the relay at Bus B is set to be done Work as a backup protection for the relay at Bus A, with a margin of time = 0.35 seconds.
Ask how much TMS of the relay B must be adjusted at Bus B
A. TMS of relay at Bus B = 0.176
B. TMS of relay at Bus B = 0.078
C. TMS of relay at Bus B = 0.095
D. TMS of relay at Bus B = 0.35
Show Answer
Answer: B
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