why we do 2 types of earthing on tranformer ie:body earthing
& nutral earthing , what is function.
i am going to instal a 5oo kva tranformer & 380 kva DG set
what should the earthing value
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Answer Posted / nitin naik
1)Body Earting:- It is a part of earthing process were we
are connecting the metallic part of the equipment to the
general mass of the earth (earth is a zero potential) to
ensure any leakage current due to failure of the insulation
of the active conductor. If it is not ensured & suppose
there is leakage current it may cause electrical shock to
the person touching the metallic part of the equipment.
2) Neutral Earting:- It is being ensured & essential where
we are installing distribution transformer (Delta to star)
& Three phase neutral DG set, Neutral earting is the
process of earthing the star point of the secondary winding
of transformer & star point of the alternator winding to
the general mass of the earth. It is essential to eliminate
the return current in neutral due to unbalanced voltage &
further to eliminate unbalance potential between the
circuits.
Note:- In both the case earth setups resistance should
below 2 Ohms.
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