Posts Tagged ‘power harmonics’

8/8 – Electrical equipment: know more about Power Harmonics

April 8th, 2010 | 5 Comments | Posted in Power quality
Tags: ,

Basics on Power Harmonics

The following figure illustrates the typical waveforms of line current and line voltage for a three-phase variable speed drive.
The line current is distorted as a result of the non linearity of the input rectifier. The voltage distortion is the result of the circulation of the distorted current through the line impedance.
In this example, the Total Harmonic Current Distortion THD i is equal to 40%, and the Total Harmonic Voltage Distortion THD u is equal to 4.3%. (See definitions below).

THD - Total Harmonic Distorsion - definition -


5/8 – Electrical equipment: power harmonics, power factor

December 12th, 2009 | 18 Comments | Posted in Power quality
Tags: , , ,

The benefits of Power Factor Correction and Power Harmonic mitigation

6 Benefits are described here:

  • Reduce electricity bill
  • Reduce power losses
  • Reduce cable size
  • Comply with power harmonic emission limits requested by Utilities
  • Improve process quality
  • Improve business performance

4/8 – Electrical equipment: power harmonics, power factor

November 30th, 2009 | 11 Comments | Posted in Power quality
Tags: , , , ,

How Power Factor and Harmonics relate to Energy Efficiency?

In an AC distribution system, the maximum active power is transmitted to a load when voltage and current are undistorted and in phase.

Harmonics Power factor (more…)

3/8 – Electrical equipment: power harmonics

November 16th, 2009 | 3 Comments | Posted in Power quality
Tags: , ,

Typical distorted current waveforms

What are Power Harmonics ?

The presence of power harmonics in electrical systems means that current and voltage are distorted and deviate from sinusoidal waveforms.


1/8 – Electrical equipment: power harmonics, power factor

October 26th, 2009 | 9 Comments | Posted in Energy Efficiency - kvar, Power quality
Tags: , , ,
Re active energy and harmonics explain with a car

Re active energy and power harmonics explained with a car

How to understand harmonics & re active energy

Are you a driver? I am sure yes, therefore you will understand power harmonics right away

Imagine a straight road, flat, a perfectly smooth surface, a constant speed. Your car works well, consumes as little as possible, and can run indefinitely.
It’s like an electrical grid with a constant power without harmonics.


Electrical engineering Community, license Creative Commons License