Ground Fault

not the ground fault, if its settings are kept low enough, 
it will operate for ground fault also. i am looking for 
some other answer.

through fault or external fault it won't operate.

no. i am asking abt the in-zone faults only. for what in-
zone faults or some conditions will it not operate.

Turn to turn fault it won't operate.
in other case if the neutral is grounded grounded through 
high impedance or Resisted earth fault it wouldn't be 
operate on ground fault.

hi zahid, thanks for the reply. can u pl elaborate a bit on 
why it wont operate on turn to turn faults or for other 
cases that u mentioned.

because there is no difference in the current at the ends 
of a winding with shorted turn: a turn fault would have to 
burn through major insulation to ground or another phase 
before it could be detected

does that mean that a shorted turn fualt wont be detected 
by any other relay too???