Answer Posted / ramniveth

the usual procedure for transmission is star to delta

for ex: 220KV/33KV
if they transmit 33KV then 33KV will be in star side and
vice versa

in this case say a delta is transmitted and gets an earth
fault .Zero sequence current will be flowing only in the
transformer .
fault current of phase which gets earthed with earth will
be almost zero .because no return path .
voltage becomes zero for the fault phase and the other two
healthy phases voltage gets root three times incresed which
may affect the whole system

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