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GATE 2020 || Power Systems || Quiz 10 (App update required to attempt this test)
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Question 1
The distribution system shown in the figure is to be protected by over current system of protection. For proper fault discrimination, directional over current relays will be required at locations
Question 2
A circuit breaker is rated as 1000A, 1000 MVA, 33 kV, 3 sec, 3 – phase oil circuit breaker then calculate the value of making current in (kA) of circuit breaker –
Question 3
The over current relays for the line protection and loads connected at the buses are shown in the figure.
The relays are IDMT in nature having the characteristic top.
The maximum and minimum fault currents at bus B are 2000 A and 500 A respectively. Assuming the time multiplier setting and plug setting for relay RB to be 0.1 and 5 A respectively, the operating time of RB (in seconds) is_____.
The relays are IDMT in nature having the characteristic top.
The maximum and minimum fault currents at bus B are 2000 A and 500 A respectively. Assuming the time multiplier setting and plug setting for relay RB to be 0.1 and 5 A respectively, the operating time of RB (in seconds) is_____.
Question 4
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 5
A resistance of 5 Ω is used for earthing the neutral of a 5 MVA, 11 kV alternator. The earth fault relay is set to operate at 0.5 A. The CTs have a ratio of 1000:10. The percentage of alternator winding unprotected is
Question 6
A 100/5 A bar primary current transformer supplies an overcurrent relay set at 25% pick up and it has a burden of 5 VA. The secondary voltage is
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Jun 26ESE & GATE EE
