Why are Stones Laid in a Switchyard Area?
Why are Stones Laid in a Switchyard Area?
Purpose of Stones/Gravel in the Power Substations 
There are so many
reasons because of which Power Substations uses stones in their switch yard,
here are some of the reasons;
·
It increases the resistance
between our foot and the ground.
·
It prevents the logging
of rain water in switch yard area.
·
It reduces step
potential and touch potential when operators work on switch yard.
·
It prevents unwanted vegetation
and growth of small weeds, plants and grass inside the switch yard.
·
It prevents the entry of
animals and wild life.
·
It improves yard working
condition.
·
It protects from fire
when oil spillage takes place.
Step Potential
and Touch Potential;
At the time of Short Circuit current Step and
Touch Potential increases.
Step Potential - It is the potential developed
between the two feet on the ground of a man or animal when short circuit
occurs. This results in flow of current in the body leads to electrical shock.
Touch Potential - It is the potential that is
created between the ground and the body during shortcoming condition. While
operating touch an electrical equipment during short circuit condition, fault
current flows through the human body.
Stones increase resistance
of soil, for this reason, step and touch potential limit decrease when people
are working in substations/switchyard it decreases the possibility of electric
shock during work.
That is why substations uses gravel/stones to reduce the step potential and touch potential when operators work on switchyard.
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