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in trains i have seen the terminal which is connected at
the top of the train is positive .where is negative ?
track? i dont think so
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Answer Posted / shashank
Dear All,
Not all traction systems work on AC supply. Wherever there
is a DC supply used, the return path is providedby the
earth i.e. the ground. Now comming to the vasics of
electrical engineering, Voltage is a unit for the Potential
diference (PD). PD itself says that there needs to be a
difference in the potential of both the electrodes for the
current to flow. It is not only that if the OHE has +ve
potential the system will work but even if the OHE has -ve
potential then also the system will work as automatically
the earth becomes the +ve eletrode.
But Indian railway uses +ve supply with referance to the
earth, hence we dont ger a shock as already the potential
is zero.
Whereas the AC Supply is concerned i agree to what manesh
has said. with the only addition that the neytral is
grounded i.e. earthed.
Shashank
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