Answer Posted / sanjeet singh
Earth is a natural "0" reference point where voltage drop
becomes zero as there is almost zero resistance of the earth
due to which full voltage is built across; while the same
zero reference can be achieved artificially by making a
neutral point as in transformers.
But it may be noted that due to voltage unbalance, neutral
of the transformer may have some voltage and in the same way
due to bad earth resistance we may not get a perfect zero
reference from ground.
To overcome this problem, we can ground the neutral of a
transformer to the earth by making perfect earth pits; that
should necessarily be separate from general body earth mats.
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