Qualité de puissance

La solution Dewesoft peut mesurer tous les paramètres de qualité d’alimentation conformément à la norme IEC 61000-4-30 Classe A. Par rapport à d’autres analyseurs de qualité d’énergie, il est possible de réaliser une analyse plus détaillée (par exemple, stockage de données brutes, comportement en cas de défaillance, calcul de paramètres supplémentaires, etc.).

Haute tension
Haute tension
Vidéo ultra-rapide
Vidéo ultra-rapide
Vidéo thermique
Vidéo thermique
E/S numérique
E/S numérique
CAN bus
CAN bus

Caractéristiques principales

  • HARMONIQUES JUSQU'À 150 kHz : Mesure des harmoniques et interharmoniques de la tension et du courant jusqu'à 150 kHz selon les normes IEC 61000-4-7.
  • THD : Calcul du THD (taux de distorsion harmonique) jusqu'au 3000ème ordre.
  • INTER-HARMONIQUES ET FRÉQUENCES SUPÉRIEURES : Mesurer, analyser les interharmoniques et les fréquences plus élevées. Les fréquences plus élevées peuvent être regroupées dans des bandes de 200 Hz à 150 kHz.
  • VARIATIONS DE TENSION ET ÉMISSION FLICKER: Calcul automatique des paramètres de scintillement et d'émission de scintillement conformément aux normes IEC-61400-4-15 et IEC-61400-21, ainsi que des variations de tension rapides (RVC).
  • VISUALISATION EN TEMPS RÉEL : Des affichageurs dynamiques et personnalisables sont disponibles pour les FFT, Harmoniques FFT, Waterfall FFT pour une visualistation en temps réel.
  • TRAITEMENT MATHÉMATIQUE AVANCÉ :  Les outils mathématiques de Dewesoft X peuvent être appliqués en temps réel pendant la mesure ou le post-traitement.
  • DONNÉES BRUTES : Les données brutes sont toujours enregistées. Vous pouvez retraiter vos données à l'infini.  
  • LOGICIEL INCLUS + MISES À JOUR GRATUITES : Intuitif, mais riche en fonctionnalités, le logiciel DEWESoft X3 est inclus. Toutes les mises à jour du logiciel sont gratuites pour à vie, sans frais cachés.


The different power quality parameters describe the deviation of the voltage from its ideal sinusoidal waveform at a certain frequency. These deviations can lead to disturbances, outages or damages of electrical equipment connected to the grid.

It is essential to permanently track these parameters: starting during the development phase (of the electrical equipment), until live operation: e.g. continuous monitoring of a couple of points in the electrical grid in order to prevent and correct quality disturbances.

The Dewesoft solution can measure all of these parameters according to IEC 61000-4-30 Class A. In comparison to other power quality analyzers it’s possible to do more detailed analysis (e.g. raw data storing, behavior at faults, calculation of additional parameters etc.).

Power analysis highlights

The Dewesoft power analyzer is a very flexible solution that combines several instruments in a single device. This introduces many advantages to your measurement process:

  • data is fully synchronized and compatible for comparison,
  • RAW data is always stored and can be additionally analyzed at any time,
  • lower learning curve,
  • lower cost.

This enables our solution to be used for multiple tests:

  • Harmonics and THD up to 150 kHz
  • Interharmonics & higher frequencies
  • Flicker, Flicker Emissions, RVCs
  • FFT, Harmonic FFT, Waterfall FFT
  • Symetrical components

Standards overview

Our solution will fulfill all the requirements of power quality standards and can be used the wide range of applications. The following table shows the supported power quality standards.

IEC 61000-4-30, IEC 61000-4-7, IEC61000-4-15

Requirements for Power Quality Analyzers, Calculation of Harmonics, Flicker etc.

EN50160, EN50163, IEE519, IEC 61000-2-4, etc.

Power Quality limits of public grid, industries and railway applications

IEC 61400-21, IEC61400-12, FGW-TR3, BDEW, VDE-AR4105 etc.

Power Quality Analysis of Renewables

IEC 61000-3-3, IEC61000-3-11

EMC of voltage changes and Flicker

IEC 61000-3-2, IEC 61000-3-12

EMC of harmonics current

FFT harmonics analysis

Harmonics are integer multiples of the fundamental frequency (e.g. 50 Hz) and cause a distortion in voltage and current of the original waveform. Harmonic voltages and currents caused by non-sinusoidal loads can affect operation and lifetime of electrical equipment and devices.

Harmonic frequencies in motors and generators can lead to increased heating (iron & copper losses), can affect torque (pulsating or reduced torque), create mechanical oscillations and higher audible noise, can cause aging of shaft, insulation and mechanical parts and reduce the efficiency.

Current harmonics in transformers increase copper and stray flux losses. Voltage harmonics increase iron losses. The losses are directly proportional to the frequency and, therefore, higher frequency harmonic components are more important than lower frequency components. Harmonics can also cause vibrations and higher noise. The effects of other electrical equipment and devices are very similar and are mainly reduced efficiency and lifetime, increased heating, malfunction or even unpredictable behavior.

Harmonics, Interharmonics and THD

The Dewesoft solution can measure harmonics for voltage, current and additional active and reactive power up to the 3000th order. All calculations are implemented according to IEC 61000-4-7 standards.

You can define the number of sidebands and half-bands for the harmonic order calculation. The higher frequency parts can be grouped in 200 Hz bands up to 150 kHz.

The calculation of THD (overall harmonic content) for voltage and current up to 3000th order and the interharmonics complete the analysis functionalities.

These powerful harmonic calculation functions offer analysis for all types of electrical equipment and devices.

Harmonics calculations

  • U, I, P, Q, and impedance

  • Individual setup of the number of harmonics including DC component (Example: 20 kHz sampling rate = 200 harmonics @ 50 Hz)

  • Harmonics up to 3000th order (@50 Hz)

  • Variable sidebands and half sidebands for Harmonics

  • Higher Frequencies up to 150 kHz in 200 Hz bands

  • Interharmonics, groups or single values

  • According to EN 61000-4-7

  • Calculation corrected to the actual real frequency

  • THD, THD even, THD odd

  • Trigger on each parameter

  • Background harmonics substractable

Full FFT frequency analysis

In addition to the FFT harmonics, a full frequency based FFT is available. All frequencies can be analyzed with this function Trigger on FFT patterns and offer definable filters:

  • hanning,
  • haming,
  • flat top,
  • rectangle, ...

​​​​​​​You can find more information about Dewesoft FFT analyzer:

FFT waterfall analysis

Beside the FFT and the harmonic FFT analysis, the solution also offers 2D and 3D FFT waterfall analysis.

This type of data visualization is especially useful for analysis at variable drives. For example, at the run-up of an inverter, you will see very clearly how harmonic sidebands grow up. The picture on the left shows runup of an inverter of a traction drive from 0 to 150 Hz.

The FFT waterfall visual display can be linear or logarithmic, 2D or 3D and sorted by harmonic order or frequency.

Flicker and flicker emission

Flicker is a term for the fluctuations (repeated variations) of voltage. Flashing light bulbs are indicators for a high flicker exposure. Flicker is especially present at grids with a low short-circuit resistance and is caused by the frequent connection and disconnection (e.g. heat pumps, rolling mills, etc.) of loads which affect the voltage.

A high level of flicker is perceived as psychologically irritating and can be harmful to people.

The Dewesoft solution offers the following features:

  • Measure all flicker parameters according to IEC 61000-4-15 standards.
  • Flicker emission calculation according to IEC 61400-21 standards and allows the evaluation of flicker emission into the grid caused by wind power plants or other generation units.
  • PST and PLT with flexible intervals.
  • Individual recalculation intervals.
  • Pinst, du, dumax, duduration

Rapid voltage changes

The Rapid Voltage Changes are parameters which are added as a supplement to the flicker standard. Dewesoft calculates the parameters according to IEC 61000-4-15 standards.

Rapid Voltage Changes describe all the voltage changes which are changing the voltage for more than 3% at a certain time interval. These voltage changes can afterward be analyzed with different parameters:

  • the depth of voltage change,
  • Du, dmax, duduration,
  • steady-state deviation,
  • etc.

Unbalance - symmetrical components

Unbalance means that the voltages (U1, U2, U3) or/and currents (I1, I2, I3) of a 3-phase system are not equal. This happens due to phases which are loaded unevenly. To analyses the unbalance, the calculation method of the symmetrical components is used. This method splits the original system in a positive system (rotation like original system), the negative system (rotation in reverse direction) and a zero system.

This allows calculating a couple of parameters for voltage, current, active-, reactive- and apparent power unbalance. The Dewesoft power analyzer allows measuring more than 50 different parameters for comprehensive analysis of the unbalanced system condition. An unbalanced system condition can lead to currents in the neutral line, warming and decrease of efficiency of different electrical equipment and even increase harmonic currents.

Frequency deviations

The Dewesoft Power Analyzer can be used for frequency monitoring and for testing the frequency behavior of power generation units at development (see renewable testing).

High-frequency deviations in public grids can have severe consequences to the electrical grid. If the frequency drops or rises too much it’s even possible that the whole power system breaks down (Blackout).

Frequency deviations are caused by the connection and disconnection of power plants or big loads. If the frequency is too high, there is too much power in the grid. If it is too low, there is too little power in the grid. Especially the trend towards more renewable power plants is causing more and more frequency deviations due to the abrupt disconnection and connection (PV, Wind) of generation units.

Online training

Additional information about how to measure voltage, current and perform power analysis can be found on our FREE online PRO training:

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