Projects / Electrical / Electrical project 18

Automatic Transfer Switch: Solar, Grid and Inverter Priority

Approx. component budget: Rs. 6,000 - 11,000

Objective

Switch the load between sources automatically in a set priority and measure transfer time and behaviour during failures.

What you will build

Contactors or relays with interlocks, voltage sensing on each source, a microcontroller applying a priority logic and a small display with a transfer-time measurement.

Results you can expect

• Transfer time for each case
• Logic table
• Lockout test (no source paralleling)
• Voltage sag during changeover
• Event log

What you will learn

Source changeover, interlocking and power continuity design, used in homes, offices and hospitals.

Tools and notes

Arduino/ESP32, relays or contactors, voltage sensors, Excel. Mains wiring is involved, so use a mechanical and electrical interlock and supervision.

Resume points from this project

• Built and tested Automatic Transfer Switch: Solar, Grid and Inverter Priority; objective: switch the load between sources automatically in a set priority and measure transfer time and behaviour during failures.
• Measured and analysed transfer time for each case and logic table; 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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