Causes of Harmonics in Networks.
Current Harmonics are caused by the harmonic currents of non-linear loads. These non-linear loads are electrical devices that do not demonstrate ‘linear’ behavior; the voltage and current are not synchronous. These devices attempt to convert the pure sinusoidal alternating voltage into a direct current. The resulting alternating current is no longer purely sinusoidal.
Power electronics, or equipment in which power electronics are present, are typical non-linear loads. In industrial and commercial installations, this type of equipment is being used to an increasing extent. As a result, harmonic pollution within these installations is increasing exponentially.
Examples of non-linear loads
Frequency inverters/variable speed drives (for AC and DC motors)
Industrial devices (welding equipment, electric arc furnaces, induction ovens, battery dischargers)
Uninterruptible Power Supplies (UPS)
IT equipment (servers, computers, printers)
Lightning with electric loads (TL-lightning, LED lightning)
Most devices that use semiconductors (transistors and/or diodes, solid state relays)
Subscribe to us to enjoy event prices and get some of the best prices.