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Answer Posted / t.govind
this open delta using protection for generator stator earth fault .
95 % stage ths cald residual voltage
third core of the PT secondary is connected delta connection when the fault accur in the stator voltage will came fr exmple 5o v . normaly it was 0 volt
exm : PT secn 3a 3n 3a 3n 3a 3n ..
frst 3a and last 3n fr out put vltg measrn at this poit only
other connection fst 3n to secnd 3a .second 3n to thrd 3a . & 3rd 3n .
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