3. Effects

In the presence of harmonics, the true RMS value of the signal is greater than the RMS value of the fundamental alone (figure 3 ). Devices (such as circuit breakers) designed for a given fundamental current may then be subject to severe additional stress.

The best-known effect of harmonics is the destruction of capacitors or circuit breakers in the event of resonance. Another frequent phenomenon in low-voltage networks is the heating of neutral conductors under the effect of rank 3 harmonic currents.

Harmonics can also have less visible, but just as real, effects in the form of accelerated equipment fatigue. We therefore distinguish between instantaneous and long-term effects.

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Effects

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page Origin of distortions

Propagation

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...