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1. |
Voltage phasors at the two terminals of a transmissi on line of length 70 k m have a magnitude of 1.0 per unit but are 180 degrees out of phase. Assuming that the maximum load current in the line is 1 5 th of minimum 3-phase fault current, which one of the following transmission line protection schemes will NOT pick up for this condition? |
A. | Distance protection using mho relays with zone-1 set to 80% of the line impedance |
B. | Directional overcurrent protection set to pick up at 1.25 times the maximum load current |
C. | Pilot relaying system with directional comparison scheme |
D. | Pilot relaying system with segregated phase comparison scheme |
Answer» B. Directional overcurrent protection set to pick up at 1.25 times the maximum load current | |