Search

Premium Membership

Get 15% OFF on Pro Premium Plan with discount code: UX21M. Study specialized electrical engineering articles and papers in Low- and High-Voltage areas.

Home / Premium Content / Advanced Electrical Engineering Guides / Power quality – Theory and practical knowledge

Sources of current harmonics

Among the sources of harmonic voltages and currents in power systems three groups of equipment can be distinguished: (1) Magnetic core equipment, like transformers, electric motors, generators, etc. (2) Arc furnaces, arc welders, high-pressure discharge lamps, etc. (3) Electronic and power electronic equipment.

Power quality - Theory and practical knowledge
Power quality – Theory and practical knowledge

Transformers

Transformers were historically the first sources of harmonics in a power system. The relationship between the primary voltage and current – shown in Figure 1 as a magnetization curve – is strongly non-linear and hence its location within the saturation region causes distortion of the magnetizing current (Figure 2).

The mechanism of harmonic generation is illustrated in Figure 3.

For each time instant the shape of distorted magnetizing current can be reconstructed by finding the subsequent values of waveforms on the magnetization curve.

PREMIUM Membership Required

This technical article/guide requires a Premium Membership. Get access to all premium HV/MV/LV technical articles, electrical engineering guides, and papers. Check out each plan’s benefits and choose the membership plan that works best for you or your organization.

You can choose an annually based Plus, Pro, or Enterprise membership plan.

SPECIAL OFFER – Get 15% Off on PRO premium plan, use discount code: UX21M

Log InSign Up

Premium Membership

Get access to premium HV/MV/LV technical articles, advanced electrical engineering guides, papers, and much more! It will help you to shape up your technical skills in your everyday life as an electrical engineer.
More Information

Electrical Engineering Courses

Learn to design electrical power and industrial automation systems through professional video courses.