⚡ 1st Harmonic — Interactive Electrical Simulation
Explore the fundamental frequency, waveform, causes and possible effects of harmonic-related electrical distortion on electronic and electrical machinery.
The 1st harmonic is the fundamental component of a periodic electrical waveform. If the fundamental frequency is 50 Hz, the 1st harmonic is 50 Hz. Higher harmonics occur at integer multiples of the fundamental: 2nd = 100 Hz, 3rd = 150 Hz, 5th = 250 Hz, etc.
🔌 How are harmonics caused?
In an ideal AC system, voltage and current are sinusoidal. However, non-linear electrical loads can draw current in pulses rather than smoothly. These current pulses can distort the supply waveform and produce harmonic components.
- Variable-frequency drives (VFDs)
- Switch-mode power supplies (SMPS)
- UPS systems
- LED lighting with electronic drivers
- Battery chargers
- Computers and electronic equipment
- Power converters and rectifiers
⚙️ Effect on Electronic & Electrical Machinery
Move the Higher Harmonics and Machinery Load controls above to see how increasing waveform distortion and loading can increase the estimated stress level.
📌 Examples
- 50 Hz supply → 1st harmonic = 50 Hz
- 60 Hz supply → 1st harmonic = 60 Hz
- 50 Hz → 3rd harmonic = 150 Hz
- 50 Hz → 5th harmonic = 250 Hz
🔧 Possible Effects
- Additional heating
- Transformer losses
- Motor vibration and noise
- Neutral conductor heating
- Power-quality problems
- Electronic equipment malfunction in severe cases
💡 Important Point
The 1st harmonic itself is not normally a harmful distortion. It is the desired fundamental component of the AC waveform. Problems generally arise when unwanted higher harmonic components become significant.