Projects / Electrical / Electrical project 34

Automatic Voltage Stabiliser with Relay Tap Changing

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

Objective

Hold the output voltage near 230 V as the input varies and measure regulation, step size and response time.

What you will build

An autotransformer with several tappings, relays to select each tap, a voltage-sensing circuit, a microcontroller with a delay and hysteresis, and a display with cut-off protection.

Results you can expect

• Output vs input voltage curve
• Tap-change response time
• Cut-off test
• Effect of hysteresis setting
• Efficiency at different loads

What you will learn

Voltage regulation, tap changing, relay switching and protection in a product used in every home.

Tools and notes

Arduino, relays, autotransformer, variac for input variation, Excel. Works at mains voltage, so use full insulation, a fuse, an enclosure and supervision.

Resume points from this project

• Built and tested Automatic Voltage Stabiliser with Relay Tap Changing; objective: hold the output voltage near 230 V as the input varies and measure regulation, step size and response time.
• Measured and analysed output vs input voltage curve and tap-change response time; 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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