7. Permissible levels on networks

Table 2 shows the compatibility levels for harmonic voltages in low- and medium-voltage networks derived from IEC standards 61000-2-2 and 61000-2-12. The compatibility level is the level of disturbance likely to occur in the environment under consideration, with a low probability of being exceeded (5%).

These figures have no equivalent on high-voltage networks.

Correct operation of electrical networks and the equipment connected to them involves finding a compromise between the disturbances emitted by disturbance-producing equipment and the immunity of equipment sensitive to these disturbances. Compatibility levels are the basis for this compromise.

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Permissible levels on networks

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Measurement

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...