Red Seal Industrial Electrician Exam 2025 – 400 Free Practice Questions to Pass the Exam

Harmonics in electrical systems refer to voltage or current waveforms that deviate from the fundamental frequency of the electrical supply. In most power systems, the fundamental frequency is 50 Hz or 60 Hz, depending on the region. Harmonics are integer multiples of this fundamental frequency and can distort the shape of the waveform, leading to a variety of issues in electrical systems.

When nonlinear loads—such as computers, LED lighting, and certain industrial equipment—are connected to the power system, they can cause these distortions, creating additional frequencies that superimpose on the fundamental frequency. The presence of harmonics can lead to increased losses, overheating of equipment, and interference with sensitive electronic devices, making it crucial to identify and mitigate their effects in electrical designs and installations.

Understanding harmonics is vital for maintaining power quality and ensuring the reliable operation of electrical systems. Analyzing harmonics involves using tools like harmonic analyzers to diagnose and correct problems, emphasizing their significance in modern electrical engineering practices.