1. Definition

Fourier analysis is used to quantify the harmonic distortion of a signal. A periodic signal (voltage or current) of any form and frequency f ₀ is decomposed into a sum of sinusoidal signals, each of which has a frequency — called harmonic — which is an integer multiple of the fundamental frequency f ₀ . This multiple is called the harmonic rank. An example of this decomposition is shown in figure 1 . The amplitude of a harmonic component is generally expressed as a percentage of the corresponding fundamental quantity — this is the harmonic ratio.

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Definition

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page Voltage quality - Harmonics

Origin of distortions

Technical and economic aspects

In the introductory article , it is shown that equipment connected to a network must, on the one hand, not "emit too much" disturbance and, on the other hand, must not be "too sensitive" to this same disturbance. While simple to express, this dual concept is more difficult to implement in the field. Indeed, for a particular piece of equipment, reducing its emission of disturbance and/or...

Bibliography

References

(1) - Guide sur la Compatibilité Électromagnétique et les normes applicables. Partie 1. - UIE (1995).
(2) - Connection of Fluctuating Loads. - UIE (1988).
(3)...

Standardization

The most recent versions at the date of publication are quoted here. The latest published versions are available in the online catalogs of the standards organizations.

IEC standards and publications

Electromagnetic compatibility (EMC) – Part 2-2: Environment – Compatibility levels for low-frequency conducted disturbances and signal transmission on public low-voltage supply networks. - CEI 61000-2-2...