Switch Gear and Protection · Power System Analysis · GATE EE
Start PracticeMarks 1
GATE EE 2023
For the three-bus power system shown in the figure, the trip signals to the circuit breakers B$$_1$$ to B$$_9$$ are provided by overcurrent relays R$$...
GATE EE 2022
The most commonly used relay, for the protection of an alternator against loss of excitation, is
GATE EE 2011
A negative sequence relay is commonly used to protect
GATE EE 2008
A two machine power system in shown below. Transmission line $$XY$$ has positive sequence impedance of $${Z_1}\Omega $$ and zero sequence impedance of...
GATE EE 2006
In a biased differential relay the bias is defined as a ratio of
GATE EE 2004
The transmission line distance protection relay having the property of being inherently directional is
GATE EE 2002
Consider the problem of relay co-ordination for the distance relays $$R1$$ and $$R2$$ on adjacent lines of a transmission system figure. The Zone $$1$...
GATE EE 2000
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
GATE EE 2000
In an inverse definite minimum time, electromagnetic type over-current relay, the minimum time feature is achieved because of
GATE EE 1997
Reactance relay is normally preferred for protection against
GATE EE 1996
If the fault current is $$2000$$ A, the relay setting is $$50$$% and CT ratio is $$400:5,$$ the plug setting multiplier will be
GATE EE 1992
A Buchholz relay is used for
Marks 2
GATE EE 2015 Set 2
A $$3$$-phase transformer rated for $$33 kV/11kV$$ is connected in delta/star as shown in figure. The current transformers $$\left( {C{T_s}} \right)$$...
GATE EE 2014 Set 1
The over current relays for the line protection and loads connected at the buses are shown in the figure.
The relays are IDMT is natural having the...
GATE EE 2010
Consider a stator winding of an alternator with an internal high resistance ground fault. The currents under the fault condition are as shown in the f...
GATE EE 2009
Match the items in List-$$I$$ (Type of transmission line) with the items in List-$$II$$ (Type of distance relay preferred) and select the correct ans...
GATE EE 2008
Voltage phasors at the two terminals of a transmission line of length $$70$$ km have a magnitude of $$1.0$$ per unit but are $$180$$ degrees out of p...
GATE EE 2003
A list of relays and the power system components protected by the relays are given in List-$${\rm I}$$ and List-$${\rm II}$$ respectively. Choose the ...
GATE EE 2000
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 curr...
GATE EE 1998
The neutral of $$10$$ $$MVA,$$ $$11$$ $$kV$$ alternator is earthed through a resistance of $$5$$ ohms. The earth fault relay is set to operate at $$0....
GATE EE 1993
The distribution system shown in figure is to be protected by over current system of protection. For proper fault discrimination directional over curr...
Marks 5
GATE EE 1996
The per unit voltages of two synchronous machines connected through a lossless line are $$0.95\,\angle {10^ \circ }$$ and $$1.0\,\angle {0^ \circ }.$$...
GATE EE 1995
Type of Relay
$$A.$$ Buchholz Relay
$$B.$$ Translay relay
$$C.$$ Carrier current, phase comparison relay
$$D.$$ Directional over Current relay
$$E.$$ ...
GATE EE 1995
The distance relay with inherent directional property is known as ________relay.