Why the power stations are filled with stones
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The stone layer on the substation ground provide high resistance so
that the fault currents flow into the ground but not along the ground.
To minimise step potential and touch potential voltages.
It avoids pool of inflammable oil etc. on the substation ground in case of any spilling of insulation oil from the equipment. This also avoids spreading of fire from one equipment to the other in the substation.
The rocky outer layer slows down the evaporation of moisture in the earth’s upper layers.
It restricts entering of snakes and other reptiles as the surface would be inconvenient to crawl.
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