8. Measurement

8.1 Principle

An initial harmonic analysis of the voltage or current waveform can be obtained by viewing the signal on an oscilloscope. This method highlights the distortion of the voltage or current, but does not allow precise quantification of the harmonic components.

There are many digital analyzers on the market capable of measuring harmonics up to rank 50. These devices are generally based on the following principle. Signals are filtered and converted into a sequence of digital values, from which a fast Fourier transform (FFT) algorithm calculates the amplitudes and phases of the harmonics.

These are then averaged over a time period linked to the speed of variation of the phenomena observed.

A value of 3 s...

You do not have access to this resource.

Exclusive to subscribers. 97% yet to be discovered!

You do not have access to this resource.
Click here to request your free trial access!

Already subscribed? Log in!

The Ultimate Scientific and Technical Reference

A Comprehensive Knowledge Base, with over 1,200 authors and 100 scientific advisors

+ More than 10,000 articles and 1,000 how-to sheets, over 800 new or updated articles every year

From design to prototyping, right through to industrialization, the reference for securing the development of your industrial projects

This article is included in

Electricity networks and applications

This offer includes:

Knowledge Base

Updated and enriched with articles validated by our scientific committees

Services

A set of exclusive tools to complement the resources

Practical Path

Operational and didactic, to guarantee the acquisition of transversal skills

Doc & Quiz

Interactive articles with quizzes, for constructive reading

Subscribe now!

Ongoing reading
Measurement

Previous
page Permissible levels on networks

Conclusion

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...