Why the substation ground is filled with crushed gravel stones .May 24, 2015 . If you observe any substation, the ground of the substation yard is filled with crushed gravel stones. This is because of the following reasons.stone crusher in substation,stone crusher in substation,Surface Material for Substation Ground Grid - Electric power .I am involved in a substation design for an additional facility of an . the surface material above the oil containment is gravel stone at 1.8 meters.
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