Why are stones laid on the ground in an electric substation?

The ground of the substation is paved with stone mainly for the following reasons:

• Fire prevention and safety: The laying of pebbles or small stones under the transformer plays a role in fire prevention. When the transformer overheating or oil injection fire, the oil will flow through the cobblestone layer, into the oil discharge pool, so as to avoid the blockage of the oil ditch, while reducing the fire, conducive to fire suppression 1. In addition, cobblestones prevent small animals from entering the transformer chamber through the drain pipe.

• Oil seepage monitoring: The cobblestone layer helps to detect leakage in the transformer in time. If the transformer has leaking oil, the oil will drip on the pebbles to form an oil trace, which is easy for inspectors to check and deal with.

• Heat dissipation and shock absorption: the transformer will produce heat and vibration when it works, and the ground laid with stone can provide a stable support to prevent poor heat dissipation and affect the service life of the transformer due to uneven ground.

• According to the "3-110KV high-voltage distribution device design Code" (GB50060-92), the oil storage pool in the substation should be laid with a certain thickness of cobblestone layer to ensure the safe operation of the oil-immersed transformer.

• Aesthetics and economy: The use of pebbles or small stones is not only practical, but also can increase the beauty of the environment, and the cost is lower than other building materials.

To sum up, the substation floor paving stone is for the comprehensive consideration of safety, maintenance and economy.