Protection

The most commonly used relay, for the protection of an alternator against loss of excitation, is

A negative sequence relay is commonly used to protect

A three-phase, $$33$$ kV oil circuit breaker is rated $$1200$$ A, $$2000$$ MVA, $$3$$s. The symmetrical breaking current is

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 answer using the codes below the lists. List-$$I$$ $$A.$$ Short Line $$B.$...

In a biased differential relay the bias is defined as a ratio of

Keeping in view the cost and overall effectiveness, the following circuit breaker is best suited for capacitor bank switching

The transmission line distance protection relay having the property of being inherently directional is

The interrupting time of a circuit breaker is the period between the instant of

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 correct match from the four choices given below List-$${\rm I}$$ $$A.$...

In an inverse definite minimum time, electromagnetic type over-current relay, the minimum time feature is achieved because of

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

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 $$0.75$$ $$A.$$ The $$CT's$$ have a ratio of $$1000/5.$$ What percentage o...

Reactance relay is normally preferred for protection against

Resistance switching is normally employed in

If the fault current is $$2000$$ A, the relay setting is $$50$$% and CT ratio is $$400:5,$$ the plug setting multiplier will be

The inductance and capacitance of a power system network upto a circuit breaker location are $$1H$$ and $$0.01$$ $$\mu F$$ respectively, the value of the shunt resistor across the circuit breaker, required for critical d...

Type of Relay $$A.$$ Buchholz Relay $$B.$$ Translay relay $$C.$$ Carrier current, phase comparison relay $$D.$$ Directional over Current relay $$E.$$ Negative sequence relay Most suited for $$P.$$ Feeder $$Q.$$ Transform...

The distance relay with inherent directional property is known as ________relay.