Answer / ankaraju.k

It is sensing to the circuit breaker when ever rating
increases

Answer / jyotirmaya

Relay is protective device which detect the fault or sense
the fault cureent and initiates Circuit breaker to trip
hence isolate the faulty part of the system from other
normal system.

Answer / muhammed quraish

Relay is a part of protective device used in cojunction
with the circuit breaker in power system protection
applications. It can detect the fault when the operating
current flowing through the relay coil exceeds the pick up
value. But it cannot directly isolate the circuit instead
its action will lead to circuit breaker to operate and will
isolate the circuit in case of a fault.

Answer / sanjay dalvi

Relay is a sensing device....which sence the abnormal
condition,when a fault current flows thrugh it,it gives a
tripping comaand to the circuit breaker....
& circuit breaker is the only device which is use to
isolate the system from faulty pa

Answer / chetan

relay is fault analsyiys device in
transmission line

Answer / muthuelectric

it is a protective device used to protect the device or
system during fault conditions

Answer / ashokreddy r

relay is a sensing device.
when the fault occurs more current flows thro the relay coil
produces sufficient field to attract circuit breaker
contacts,so that ckt is opened

Answer / gopi

relay is protective device which is first find or determine
the fault in the section and initiate the circuit breaker
for isolate the faulty section from healthy section.

Answer / virendra

Relay is a kind of Electromechanical object which sence the
perameter for which it is designed , compare with the
desired & act according to that

Answer / chetan

Relay is device it detect the fualt

How to find Cable size? Caterpillar generator produce (Two generators) 127*2=254 amp at 11 kv . What would be the cable size (XLPE) to supply 256 amp at 11 kv? Air or surrounding Temperature is 32 degree C. Cable will go under ground at 2.5 feet depth. Group Rating Factors is 3 cables. Clearance between cables is 7 cm. Soil Temperature (Ambient) 28o C Soil Thermal Resistivity is 1.2 K.m/W I would like to use 3 separate single core instead of using 3 core cable. Some says I should use three separate single core 120RM cables. Some says 70RM .some says 95. I m totally confused. Is there ant specific rule to determine cable size? What would be the LT cable size to flow 500 Amp current? Ifte My e mail address is ifte13@yahoo.com Anyone please send me the answer to my e mail address, i will be very glad.

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