Radial distribution system as shown below Requiring both relays have a standard operation Inverse (SI) [IEC 60255].
Discrimination Between relays at Bus A and at Bus B using Grading Margin = 0.35 seconds and adjust the settings as specified to calculate the time that the relay at Bus B runs when the Fault occurs as shown
A. relay Operates at Bus B = 0.35 seconds
B. relay Operates at Bus B = 0.5 seconds
C. relay Operates at Bus B = 2.97 seconds
D. relay Operates at Bus B = 3.32 seconds
Show Answer
Answer: B
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