Projects / Electrical / Electrical project 53

Appliance Voltage Guard: Under/Over Voltage Protection with Delay

Approx. component budget: Rs. 1,500 - 3,500

Objective

Protect compressor loads from unsafe voltage and test the cut-off accuracy and delay behaviour.

What you will build

A guard for a refrigerator or AC that cuts supply on low or high voltage and reconnects after a safe time delay, with a display of the live voltage.

Results you can expect

• Cut-off voltage accuracy at 4 set points
• Reconnect delay timing
• Relay switching life estimate
• And a comparison with a commercial guard

What you will learn

Voltage sensing, hysteresis, time delays and relay selection for inductive loads.

Tools and notes

Arduino, ZMPT101B, 16A relay, LCD, enclosure and fuse. Mains input is involved, so use an isolated test box and supervision.

Resume points from this project

• Built and tested Appliance Voltage Guard: Under/Over Voltage Protection with Delay; objective: protect compressor loads from unsafe voltage and test the cut-off accuracy and delay behaviour.
• Measured and analysed cut-off voltage accuracy at 4 set points and reconnect delay timing; 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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