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Q#1 Power System Protection GATE EE 2008 MCQ +2 marks -0.66 marks

Voltage phasors at the two terminals of a transmission line of length 70 km 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 1/5th of minimum 3-phase fault current, which one of the following transmission line protection schemes will NOT pick up for this condition?

Distance protection using mho relays with zone-1 set to 80% of the line impedance

Directional over current protection set to pick up at 1.25 times the maximum load current

Pilot relaying system with directional comparison scheme

Pilot relaying system with segregated phase comparison scheme

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Network Analysis 268 0 0
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Power Systems 350 0 0
EMFT EE 111 0 0
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