Evaluate relay coordination for the minimum fault currents
Chapter , Problem 10.11(choose chapter or problem)
Evaluate relay coordination for the minimum fault currents in Example 10.4. For the selected current tap settings and time dial settings, (a) determine the operating time of relays at B2 and B3 for the 700-A fault current. (b) Determine the operating time of relays at B1 and B2 for the 1500-A fault current. Are the fault-to-pickup current ratios d2.0 (a requirement for reliable relay operation) in all cases? Are the coordination time intervals d 0.3 seconds in all cases?
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