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Earth Resistance Measurement: Fall-of-Potential Test Set-up and Soil Study

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

Objective

Measure earth resistance with the three-point method and see how soil type, moisture, electrode depth and salt treatment change it.

What you will build

A low-voltage AC source with an isolating transformer, a current and voltage measurement unit, test electrodes and spikes at set distances, and a model earth pit with different soil mixes.

Results you can expect

• Resistance vs electrode distance (plateau curve)
• Effect of moisture and salt
• Effect of depth
• Comparison of two electrode types

What you will learn

Earthing design and testing, soil resistivity and the safety reason behind earthing, a common task in electrical inspection and testing.

Tools and notes

Isolation transformer, multimeter, copper electrodes, soil samples, Excel. Use low voltage only, and do not run the test near live equipment.

Resume points from this project

• Built and tested Earth Resistance Measurement: Fall-of-Potential Test Set-up and Soil Study; objective: measure earth resistance with the three-point method and see how soil type, moisture, electrode depth and salt treatment change it.
• Measured and analysed resistance vs electrode distance (plateau curve) and effect of moisture and salt; 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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