Answer / denzel101

it is a relay that checks for current balance between the
primary and the secondary side of a transformer.it is also
used in other components of the power system like to
protect cables.it is also known as a unit protection as it
does not discriminate with any other protection schemes.the
ct secondary currents that circulates in the coil of this
relay from primary and secondary of the transformer
cancells each other when the system is healthy.when the
fault occurs in a system the balance is disturbed and the
resultant current activate the relay and cause trip.

Answer / manikandan

actually differential relay function in transformer . this
relay monitoring the both side current(primary and seconday)
if current diffrent occure in transformer i t will be trip
the incoming breaker.

Answer / debajit ghosh

The differential relay calculate the current of primary
side and secondery side within the ratio.

Answer / charu manchanda

a differential relay is a protective element which finds the
fault or difference between the primary and secondary current.

Answer / krishnanraman

diff relay generally used for finding the difference in
primary and secondary circuit,the relay connect between the
primary and secondary circuit,normally the current flows
through the primary and through secondary thst time relay
is inoperative mode,when fault occurs the primary changes
as per secondary changed thus relay energise and trip the
circuit

Answer / karthick pdcs

The differential relay which using to check current flow direction.

Answer / durgesh bisht

The differential relay which funtion on failure of the
internal phase and earth fault winding insulation damege
ect.

Answer / gopi

1.buhoolez relay.
2.over current relay.
3.earth leakage relay
4. thermal relay

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