Why stones are used in substation? All Questions › Category: Transmission And Distribution System › Why stones are used in substation? 0 Vote Up Vote Down chetan shidling asked 5 years ago I need short information. 1 Answers 0 Vote Up Vote Down chetan shidling answered 5 years ago The stones are used in substation because: To avoid growing of grass. To avoid insects to come in station. To avoid water storing during rainy season.