1
GATE EE 2000
Subjective
+5
-0
For the configuration shown in figure, the breaker connecting a large system to bus $$2$$ is initially open. The system $$3$$-phase fault level at bus $$3$$ under this condition is not known. After closing the system breaker, the $$3$$-phase fault level at bus $$1$$ was found to be $$5.0$$ p.u. What will be the new $$3$$-phase fault level at system bus $$3,$$ after the interconnection? All per unit values are on common base. Prefault load currents are neglected and prefault voltages are assumed to be $$1.0$$ p.u. at all buses. GATE EE 2000 Power System Analysis - Symmetrical Components and Symmetrical and Unsymmetrical Faults Question 6 English
2
GATE EE 2000
MCQ (Single Correct Answer)
+1
-0.3
In a 3-step distance protection, the reach of the three zones of the relay at the beginning of the first line typically extends upto
A
100% of the first line, 50% of the second line and 20% of the third line.
B
80% of the first line, 50% of the second line and 20% of the third line.
C
80% of the first line, 20% of the second line and 10% of the third line.
D
50% of first line, 50% of second line and 20% of the third line.
3
GATE EE 2000
MCQ (Single Correct Answer)
+1
-0.3
In an inverse definite minimum time, electromagnetic type over-current relay, the minimum time feature is achieved because of
A
Saturation of the magnetic circuit
B
Proper mechanical design
C
Appropriate time delay element.
D
Electromagnetic damping.
4
GATE EE 2000
MCQ (Single Correct Answer)
+2
-0.6
The plug setting of a negative sequence relay is $$0.2$$ $$A.$$ The current transformer ratio is $$5:1$$. The minimum value of line to line fault current for the operation of the relay is
A
$$1A$$
B
$${1 \over {1.732}}A$$
C
$$1.732$$ $$A$$
D
$${{0.2} \over {1.732}}A$$
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