Answer / rk

TO REDUCE THE FIRE HAZARD DURING OIL LEAKAGE OR OIL
SPILLOVER DURING ANY UTWANTED SITUATIONS FOR INSTANCES SHORT
CKT. INSIDE TRANSFORMER. OIL IS FLAMMABLE IN NATURE.

Answer / rajeshsan

There are many reasons for using gravel stones of 60mm size below transformer. Few are:-

1. During oil spillage from transformer or during sprinkler system act the water draining from soak pit it will be easier.

2. To avoid the grown of grass and entry of animals etc.,

3. To reduce the step potential

You can please refer the NFPA 850 for details.

Answer / santhosh (saint-gobain)

1. Avoid water stagnent under transformer,
2. Vibration absorption,
3. Stones having no conductivity..

Answer / saikrishna

To decrease the contact from earth

Answer / m.kumaran

because reduce the step potential while short circuit timing

Answer / suresh babu

first to prevent the stagnent of water under the transformer
second vibration withstand
third low resistivity i mean rock stones forms low
resitivity path

Answer / baljeet singh

To reduce the short circuit current when fault occurs in transformer

Answer / raghu

The stones will absorb the vibrations from the transformers
and other switch gear equipemts..

Answer / talluri

Rock will protect substation from electrical damages

Answer / shahul

To avoid the snake and other insect enter inside the
transformer structure and also avoid water flooding
under the transformer during the rainy season

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