Why are stones laid in a Substation

Why are stones laid in a Substation

 Why are stones laid in a Substation

Transformer stations operate under high-voltage conditions, posing safety risks to both equipment and personnel. 

Stones or gravel are used to enhance safety, reduce electrical hazards, and maintain cleanliness.

In this article, we will explore the key reasons for placing stones in transformer stations in detail.

Reason 1: Reducing Ground Potential Rise (GPR)

Ground potential rise or Touch Voltage is the voltage that a person may experience when touching a conductive metal surface while standing on the ground or when handling an electrical device during a fault or grounding issue. This is a major concern in the design and construction of transformer substations, as high voltage can pose serious risks to both people and equipment.

Reason 2: Reducing Step Voltage

Step Voltage is the difference in electrical potential between two points on the ground separated by a single step (approximately one meter) while electrical current is flowing through the ground at a transformer station. This voltage difference usually occurs due to an electrical leakage or a grounding fault, causing current to pass through the soil.

Reason 3: Keeping the Transformer Station Clean

Placing stones in a transformer station prevents the accumulation of rainwater and the growth of vegetation, which could lead to fires due to high voltage arcs. Additionally, the gravel layer helps maintain a clean environment and prevents animals from entering the station.

Conclusion :

The presence of stones in transformer stations plays a crucial role in ensuring safe and efficient operation by minimizing electrical hazards and reducing the risk of fire from insulating oil spills.