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Answer Posted / minalverma
surge arresters are also called as lighting arresters.They
are always connected in shunt to the equipment to be
protected.They provide a low impedance path for the surge
current/surge voltage to the ground.
when the lightening ocurs,there is a voltage around some
thousands of voltage on line (35000v to 5000v) for a
fraction of second which is very high more than enough to
damage all the equioments in the grid connected to it.so
when a lightning arrester is connected then it provides a
low impedance path such that all that high voltage is
directed towards the earth resulting the protection of all
the equipments connected to the grid.
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