Answer / jaya

buchhloz relay

Answer / maha

The anser is Differential relay because the examinor asked
the question in the sense of power tranformer. but buch
hole relay is used for tranformer internal faults..

Answer / j.ramkumar

over voltage reley
over current reley
earth fault reley
dv/dt relay
diff relay
bocolz relay
surge protection relay
over fluxing relay

Answer / g.v.suresh kumar

BUCHLOZ RELAY IS USED FOR INCIPITENT FAULTS
PERCENTAGE DIFFERENTIAL RELAY IS USED FOR INTERNAL FAULTS
AND EXTERNAL FAULTS

Answer / v.c.k

Buchholz relay
Gas Pressure/Oil and winding temperature relay provided

Answer / gopi

yes, we can use buchhloz relay to protect the transformers.

Answer / anjani kumar

For internal fault buchholz relay
is used while external fault differential relay is used.

Answer / m.v.subba reddy

buchholz relay

Answer / jaya

buchholz relay

Answer / paul

1.Differential Relay or
2.Overall differential Relay
3.Overflux Relay
4.Buchholz Relay (Only for oil immersed transformers, but widely used)
5.OLTC Buchholz Relay
6.PRV Relay
7.OT
8.Trip Relay
9.WT Trip Relay etc....

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