Cont'd WHAT ARE HARMONICS?

Harmonic sources

The main sources of voltage and current harmonics within the power system are:-

Single-Phase:

• Computers, fax machines, photocopiers, UPS’s, TV’s, VCR’s, etc.;
• Lighting dimmers & electronic ballasts for high efficiency lighting;
• Single-phase AC & DC drives;
• Ultra-violet disinfection systems;

Three- Phase:

• Variable speed AC & DC drives;
• UPS systems;
• Arc furnaces & SCR temperature controllers;
• Battery chargers;
  In fact any single or three phase electrical power conversion equipment which converts from AC to DC!