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GATE 2022 : Power System Quiz 10

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Question 1

If the time of operation of a relay for unity TMS is 10 sec. the time of operation of 0.5 TMS will be in secs.?

Question 2

The operating characteristics of a reactance type distance relay

Question 3

An IDMT type over-current relay is used to protect a feeder through a 500/1 CT. The relay has a plug setting of 125% and TMS = 0.Find the value of plug setting multiplier of the relay if a fault current of 5000 A flows through the feeder.

Question 4

Calculate the time of operation of an IDMT type over-current relay is used to protect a feeder through 400/1 ACT, relay has plug setting of 125٪ and TMS =0.6 and fault current is 4000 A . Use the following characteristic.

Question 5

What is the percentage of the alternator winding is protected if the neutral of 10 MVA, 11 kV alternator is earthed through a resistance of 5 ohms. The fault ready is set to operate at 0.75 A. The current transformers have a ratio of 1000/5?

Question 6

A 100/5 A bar primary current transformer supplies an over current relay set at 25% pickup and it has a burden of 5 VA. The knee point voltage and cross section of the core if the CT has 50 turns on its secondary and the fault current is 15 times the relay setting.
Assume the flux density as 1.4 Wb/m².

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ESE & GATE EE Power Systems

Sep 26ESE & GATE EE