GATE 2024 Power System Foundation Quiz 45

An electromechanical mho relay has its operating torque governed by relation, T_o = aVI cos(– d) and restraining torque governed by T_r = bV²,

The condition on ratio and admittance Y when relay operate is

Which one of the following is not a basic functional characteristic of a protective relay?

For generator protection, which relay would be used if there is loss of prime mover?

Consider the following statements regarding microprocessor base relay’s, select correct statements

1. it has less burden

2. it is faster in operation

3. it has less installation as well as maintenance cost

If the fault current is 100A at the secondary side of CT having a ratio of 400:5, for an IDMT relay with plug setting of 125% and time of operation is

5 sec for PSM = 12,

4 sec for PSM = 16,

3 sec for PSM = 20,

Where, PSM is plug setting multiplier

If the actual time of operation is 0.4 sec, then the value of Time Multiplier Setting is ____.