Projects / Electrical / Electrical project 59

Digital Insulation Resistance Tester (Megger) with Polarisation Index

Approx. component budget: Rs. 5,000 - 9,000

Objective

Build a megger and compare its readings against a commercial instrument on cables and windings.

What you will build

A DC high-voltage module (500 V) with a measurement circuit that reads insulation resistance in megohms, and logs resistance over 10 minutes to compute the polarisation index.

Results you can expect

• Resistance readings vs a commercial megger for 5 samples
• Error percentage
• Dielectric absorption ratio and polarisation index
• And repeatability

What you will learn

Insulation testing practice, high-resistance measurement and leakage currents, directly useful in testing and compliance roles.

Tools and notes

DC-DC high-voltage module, high-value resistors, ADC, ESP32, display. High voltage is involved: use current limiting, discharge resistors, insulated probes and supervision.

Resume points from this project

• Built and tested Digital Insulation Resistance Tester (Megger) with Polarisation Index; objective: build a megger and compare its readings against a commercial instrument on cables and windings.
• Measured and analysed resistance readings vs a commercial megger for 5 samples and error percentage; 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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