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Power Quality

The Dewesoft solution can measure all the power quality 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.).

High Voltage
High Voltage
High-speed video
High-speed video
Thermal video
Thermal video
Digital IO
Digital IO
CAN bus
CAN bus

Main Features

  • HARMONICS UP TO 150 kHz: Measure and analyze harmonics for voltage and current and THD with frequencies up to 150 kHz. All measurements are implemented according to IEC-61000-4-7 standards.
  • THD CALCULATION: The calculation of THD (overall harmonic content) for voltage and current up to 3000th order.
  • INTERHARMONICS & HIGHER FREQUENCIES: Measure and analyze interharmonics and higher frequencies. The higher frequency parts can be grouped in 200 Hz bands up to 150 kHz.
  • FLICKER, FLICKER EMISSIONS & RVCs: Automatic flicker and flicker emission parameters calculation according to IEC-61400-4-15 and IEC-61400-21 standard.
  • GREAT REAL-TIME VISUALS: Fast and customizable visual displays are available for FFT, Harmonic FFT, Waterfall FFT with real-time visual feedback.
  • HIGH-SPEED RAW DATA STORING: Hardware and software provide a powerful storing engine with continuous stream rate of more than 500 MB per second. We always store raw data for you no matter what. This gives you endless possibilities for offline data processing.
  • ADVANCED ONLINE AND OFFLINE MATH PROCESSING: Dewesoft X offers easy-to-use mathematics engine. Math can be applied in real-time during measurement or post-processing. 
  • FAST REVIEW OF DATA: Datafiles, even if gigabytes large, can be opened and reviewed in seconds.
  • HIGH-CHANNEL COUNT SOLUTIONS: We offer large channel count system configurations with thousands of channels using network configuration.
  • NO HIDDEN COST SOFTWARE LICENSING: Our software licensing is very flexible and has no renewal or upgrade fees. Upgrades for Dewesoft X are FREE forever. You also don't require any additional license to view/analyze the data. Once the data file is stored it can be reviewed and analyzed on unlimited computers without the need of additional software licenses.


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 61’’’-4-3’ 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 15’ 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 61’’’-4-3’, IEC 61’’’-4-7, IEC61’’’-4-15

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

EN5’16’, EN5’163, IEE519, IEC 61’’’-2-4, etc.

Power Quality limits of public grid, industries and railway applications

IEC 614’’-21, IEC614’’-12, FGW-TR3, BDEW, VDE-AR41’5 etc.

Power Quality Analysis of Renewables

IEC 61’’’-3-3, IEC61’’’-3-11

EMC of voltage changes and Flicker

IEC 61’’’-3-2, IEC 61’’’-3-12

EMC of harmonics current


FFT harmonics analysis

Harmonics are integer multiples of the fundamental frequency (e.g. 5’ 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 3’’’th order. All calculations are implemented according to IEC 61’’’-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 2’’ Hz bands up to 15’ kHz.

The calculation of THD (overall harmonic content) for voltage and current up to 3’’’th 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: 2’ kHz sampling rate = 2’’ harmonics @ 5’ Hz)

  • Harmonics up to 3’’’th order (@5’ Hz)

  • Variable sidebands and half sidebands for Harmonics

  • Higher Frequencies up to 15’ kHz in 2’’ Hz bands

  • Interharmonics, groups or single values

  • According to EN 61’’’-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 ’ to 15’ 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 61’’’-4-15 standards.
  • Flicker emission calculation according to IEC 614’’-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 61’’’-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 5’ 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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