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Subject Revision:Power System Quiz
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Question 1
A 3 - ∅ transformer rated for 33 kV/6.6 kV is connected star/delta and the protecting current transformer on the low voltage side have a ratio of 400/5. The ratio of current transformer on the HV side is
Question 2
A relay at rating 8 A, 2.2 sec IDMT and having a relay setting of 130% TMS = 0.6. It is connected to a supply circuit through a CT ratio 400/5 ratio. If the fault current is 5000 A, the plug setting multiplier of the relay is
Question 3
In a 3-phase synchronous generator, the induced emf in one of the phases is 4.5 pu. If a current of 14.2 pu flows through the 0.82 pu negative sequence impedance, determine the negative sequence voltage of the phase with respect to the reference bus.
Question 4
The estimated short circuit MVA at the bus bars of a generating station A is 1500 MVA and of another station B is 1200 MVA. The generated voltage at each station is 33 KV. If these stations are inter connected through a line having a reactance of 1 Ω and negligible resistance, the possible short circuit MVA on station A is
Question 5
It is proposed to control the voltage of a 3-phase, 3.3 MVA feeder varying between 3 KV and 3.5 KV about 3.3 KV.
The minimum turns-ratio of the regulator and rating of it is respectively,
The minimum turns-ratio of the regulator and rating of it is respectively,
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Dec 19ESE & GATE EE
