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Three-Phase Supply Monitor: Phase Failure, Reversal and Unbalance Detector

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

Objective

Detect missing phases, wrong phase sequence and voltage unbalance in a three-phase supply and trip a contactor.

What you will build

Three voltage-sensing inputs through isolation transformers or low-voltage three-phase source, a microcontroller checking presence, sequence and unbalance, and relay outputs with a display.

Results you can expect

• Detection and trip time for each fault type
• Unbalance % threshold
• Sequence detection test
• False-trip check during normal variation

What you will learn

Three-phase systems, phase sequence and unbalance, protection for motors and pumps.

Tools and notes

Arduino/ESP32, small three-phase isolating transformers or a low-voltage three-phase source, relays, Excel. Use a low-voltage supply for the demonstration and a fused enclosure.

Resume points from this project

• Built and tested Three-Phase Supply Monitor: Phase Failure, Reversal and Unbalance Detector; objective: detect missing phases, wrong phase sequence and voltage unbalance in a three-phase supply and trip a contactor.
• Measured and analysed detection and trip time for each fault type and unbalance % threshold; 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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