Answer / somnath sharma

The use of earth switches is to send any trapped charge in the line into ground after the line is switched off.
Mainly what happens, when the line is switched off, some charges remain trapped in line due to their own capacity and also due to influence of side by X-line. This trapped charge is dangerous if someone goes for maintenance of that very line. So it is very much required to neutralise that much charge and here comes the use of earth switches.

Answer / venky_eee07

earth switches used in substation . in that when isolator
OPEN condition earth switch is CLOSED. here any induction
that passes thro' earth switch to ground.when isolator in
CLOSED condition Earth switch should be Open

Answer / mohammad

Earthing Switch is necessary to earth the conducting parts
before maintenance and also to provide deliberate
short-current while testing.This enables various tests to be
performed on the Switchgear or item of equipment, such as
testing the current Transformer of measuring the operating
time of breakers, without having to open the enclosure.
During normal operation the insulation is bypassed by a
short-circuit-proof link.

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