5. Foisonnement

A harmonic quantity (voltage or current) is defined by its amplitude. It is also defined by its phase angle. The notion of phase is particularly important when there are several sources of disturbance on a network, and you want to calculate the resulting current (or voltage). This is because the harmonic currents emitted by the various sources add up vectorially.

Note :

You need to be very careful with this notion of phase, as not all meters indicate the angle with respect to the same reference. Some give the angle in relation to the zero crossing of the voltage, or even the fundamental current, while others give it in relation to the harmonic voltage. These quantities do not have the same physical meaning.

The current resulting from a large number of harmonic sources can be significantly different,...

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Foisonnement

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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...