Archive for the ‘Power quality’ Category

7/8 – Electrical equipment: harmonic mitigation

February 11th, 2010 | Make a comment | Posted in Power quality
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How to achieve “harmonic mitigation” ?

Several different solutions are proposed for Harmonic mitigation. The right choice is always dependent on a variety of factors, such as the activity sector, the applicable standards, the power level …. Several solutions are relative to Variable Speed Drives, as this type of electrical equipment represents a large part of the installed power in industrial installations and the most significant current generators.

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GPS synchronization for power system s

January 27th, 2010 | 7 Comments | Posted in Power quality
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GPS time Synchronization:  reliability starts with precision timing.

 
Precision timing is required for monitoring and control of electrical power networks where reliability is important.  Circuit breaker control schemes require precise timing to ensure proper operation, and Sequence of Events Recording systems report events with one-millisecond precision to aid diagnostics and troubleshooting.  Typical “” applications include electric utility networks, data centres, hospitals, water treatment plants, refineries, and other process industries.

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6/8 – Electrical equipment: improve power factor

January 20th, 2010 | 7 Comments | Posted in Power quality
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How to improve power factor ?

Power factor has been defined earlier as a function of active and apparent power. For sinusoidal (undistorted) voltage and current, a vector representation is also possible and helpful.
For most electrical loads like motors, the current I is lagging behind the voltage V by an angle phi.
Ia is called the “active” component of the current.
Ir is called the “reactive” component of the current.

Voltage and current vectors

Voltage and current vectors

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

December 12th, 2009 | 3 Comments | Posted in Power quality
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The benefits of 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
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4/8 – Electrical equipment: power harmonics, power factor

November 30th, 2009 | 8 Comments | Posted in Power quality
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How Power Factor and Harmonics relate to Energy Efficiency?

In an AC distribution system, the maximum 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 | 1 Comment | Posted in Power quality
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Typical distorted current waveforms

What are ?

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

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2/8 – Electrical equipment: power factor

November 9th, 2009 | 6 Comments | Posted in Power quality
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What is “Power Factor”?

power factor definition

power factor definition

The definition of “Power Factor” relies on the definitions of “active power” and “apparent power”.

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

October 26th, 2009 | 4 Comments | Posted in Energy Efficiency - kvar, Power quality
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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.

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Harmonics overview

October 12th, 2009 | 4 Comments | Posted in Power quality
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Why harmonics problem?    3 types of solutions!      How to make a choice ?     Any software tools ?

Typical distorted current waveforms

Typical distorted current waveforms

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electrical installation harmonic problems part 4

September 28th, 2009 | 2 Comments | Posted in Power quality
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Examples of -related malfunctions in electrical installations : case of  “High harmonic distortion loads”

High voltage distortion at Courchevel ski resort

High voltage distortion at Courchevel ski resort

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