What is the basic difference between 90% stator earth fault
and 100% stator earth fault, and its phenmenona?
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Answer Posted / amit khamesra
As neutral of the generator is approched, the driving
voltage available between the fault point and the neutral
is very low & hence not detectable. So last 5% of the
generator winding remains nprotected with the conventional
schemes of E/F protection. that is why it is called 95%
stator earthfault protection. For covering the rest of 5%
winding other techniques like 3rd harmonic principle ets
are available.
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