Answer / raju

Relays are 3 types
1. Mechanical relay
2. electromechanical relay
3. numerical relay
RELAY WILL SENCE THE FAULT CURRENT THROUGH CURRENT
TRANSFORMER AND IT WILL GIVE A COMMAND/ SIGNAL TO TRIPPING
COIL WHICH WILL TRIP THE BREAKER.

Answer / rvg

Relays are electro-mechanical switches, and it needs some
power either AC/DC to operate the activation coil.
As soon as the coil gets magnetised, the contact attached
will make/break.

Answer / anand shukla

a relay is a sensing device ,which sense the fault and give
signal to the circuit breaker.
relay are many types which is is used in different
conditions.
1- electromagnetic relay
2- thermal overload relay
3-directional & nondirectiobal relay.
4- distance relay
5-mho relay
6-trip circuit supervision relay
7- master trip relay.
in realy some types of contacts are fitted
like no and nc which is interchange when current exceed a
preset value it means when relay operated.

Answer / simpal

Relay is basically a switchgear which senses the fault
occuring in the system and give signal to circuit brekar 2
remove the healthy part from the faulty part

Answer / xxx

Sorry santhosh you are answer is not correct.

Answer / chowndaryaa sehar

Relay is the device which will sense and isolate the fault
by giving a signal to circuit breaker with help of a
controller chip.

Answer / ramanharikrishnan

Relays are working with sensation of fault while
occuring in system.

Answer / sindhuja

Relay works with with inputs of CURRENT... VOLTAGE..
BASICALLY- CURRENT OPERATED AND VOLTAGE OPERATED.
Relay has the element.
if the element sense the I or V .. which crosses the set
valve .. then it operates.

Answer / nagesh

Relay is switch which can be operated by rated power supply
at the rated current...Relay consists of NO and NC contact
which operates depending on the Coil

Ex ---NO contact will become Close when relay is activated
------NC contact will open when relay is energised

Answer / bhumi

Relay is one kind of electro mechanical device with is
intended to sence the fault(the situation which is opposite
to its normal operation & as well as the function of the
relay for which it has been made)& to give command to the
circuit breaker immediately to isolate the faulty part from
the healthy portion to save the entire system.

can anyone help me regarding bout Electrical designs and calculations .. which text book should i follow as i am a trainee engineer.Description of my work which is Electrical designs like cable sizing, lighting, lightning, Gensets sizing, motor sizing, transformer sizing, generator sizing, circuit breakers, PDB MCC PCC SLDB MLDB panels, Single line diagrams mainly, substation desings, cable routing and layouts, reactive power compensations, power factor improvement, voltage drop calculations, power generations, power transmission, power distributions all calculations.Please help me

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