Projects / Electrical / Electrical project 25

Power Quality Analyser: Harmonics (THD) of Common Household Loads

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

Objective

Measure and compare the harmonic distortion of LED lamps, SMPS chargers, computers, fans and other loads.

What you will build

A current and voltage sensing board feeding an ESP32 that samples at high speed, computes FFT and shows harmonic content, THD and power factor for different appliances.

Results you can expect

• Harmonic spectrum for each load
• THD of current
• Power factor vs displacement factor
• The effect of combining loads

What you will learn

Harmonics, FFT, power quality standards and why LED and electronic loads distort the supply.

Tools and notes

ESP32, ZMPT101B voltage sensor, CT sensor, Python or Excel. Connects to mains, so use a fused, enclosed, isolated test box and supervision.

Resume points from this project

• Built and tested Power Quality Analyser: Harmonics (THD) of Common Household Loads; objective: measure and compare the harmonic distortion of LED lamps, SMPS chargers, computers, fans and other loads.
• Measured and analysed harmonic spectrum for each load and THD of current; 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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