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Earthing Grid Model: Step and Touch Voltage Study

Approx. component budget: Rs. 4,000 - 8,000

Objective

Understand how grid layout and soil resistivity change safety near a substation.

What you will build

A sand or soil tray model of a substation earthing grid, with a test current injected and voltages measured on the surface to find step and touch potentials.

Results you can expect

• Surface potential profile
• Step and touch voltage for 3 grid layouts
• Grid resistance
• And comparison with a standard formula or simulation

What you will learn

Earthing design, soil resistivity, touch and step voltage limits and safety standards.

Tools and notes

Tank of soil, copper wire grid, low-voltage AC source, digital voltmeter, Python or Excel. Use a safe low voltage only, with insulated gloves and supervision.

Resume points from this project

• Built and tested Earthing Grid Model: Step and Touch Voltage Study; objective: understand how grid layout and soil resistivity change safety near a substation.
• Measured and analysed surface potential profile and step and touch voltage for 3 grid layouts; wrote the report and presented the results in a viva. Add your own numbers: [x].

Replace [x] with your own measured results. Write only what you really did.

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