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what is the diffrantial relay???????why we use it on the MDB
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Answer Posted / sudheer
DIFFERENTIAL RELAY is used to sense generator supply in two
different locations. in generator out put leads are six. in
three phase winding- three leads of begining of coils and
three leads of ends of coils.three leads are named R,Y,B
and other three leads are R1,Y1,B1. we make star connetion
by joint R1,Y1,B1 and make neutral point by this
junction.we ground this neutral.we provide three CT'S in
RYB side and three CT'S in R1 Y1 B1 side.
if any fault occurs in winding between RYB and R1 Y1 B1 the
resultant supply operates the differential relay and the
generator stops automatically.
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