Electrical disturbances in LV

LV networks are highly polluted and subject to a large number of
aggressions. Electrotechnical equipment and in particular electronic
devices, that are increasingly numerous and process ever lower signals,
must withstand a harsh electromagnetic environment. At the same time
availability requirements, whether for production, management or
commerce, are increasingly great.

To improve the quality of the “electricity product” and avoid malfunctioning
and in some cases destruction of the components of the electrical network
and/or sensitive loads, it is essential to understand the origin of the
disturbances and evaluate their risks. This is the purpose of this “Cahier
Technique”, which is an introduction to the vast field of electromagnetic
compatibility and immunity from 50 Hz through to radioelectric frequencies.
In this document the author deals with all parameters and their main
“anomalies” used to characterise an electrical supply:
* amplitude: variations – interruptions – dips – overvoltages,
* frequency: variations,
* waveform: harmonics – transients – carrier currents,
* phase: unbalance,
* power: short-circuits – overloads (effects on voltage).