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what happen to the voltage and current in all phases when an
earth fault occur in a phase in three phase three wire
system(delta connected)...
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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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