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Q#1 Power System Protection GATE EE 2023 MCQ +1 mark -0.33 marks

For the three-bus power system shown in the figure, the trip signals to the circuit breakers  to  are provided by overcurrent relays  to , respectively, some of which have directional properties also. The necessary condition for the system to be protected for short circuit fault at any part of the system between bus 1 and the  -  loads with isolation of minimum portion of the network using minimum number of directional relays is

 and  are directional overcurrent relays blocking faults towards bus 2.

 and  are directional overcurrent relays blocking faults towards bus 2 and  is directional overcurrent relay blocking faults towards bus 3.

 and  are directional overcurrent relays blocking faults towards Line 1 and Line 2, respectively,  is directional overcurrent relay blocking faults towards  ine 3 and  is directional overcurrent relay blocking faults towards bus 2.

 and  are directional overcurrent relays blocking faults towards Line 1 and Line 2, respectively.

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Topic Questions Attempted Correct
Network Analysis 259 0 0
Signals and Systems 164 0 0
Control Systems 201 0 0
Analog Electronics 180 0 0
Digital Electronics 148 0 0
Electrical Machines 390 0 0
Power Electronics 237 0 0
Power Systems 343 0 0
EMFT EE 9 0 0
Measurement 152 0 0
Engineering Mathematics 225 0 0
General Aptitude 206 0 0