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Category Archive for: «Energy and Power»

Sources Of The Electric Energy – Generation

Producing electricity There are a number of ways to produce electricity, the most common commercial way being the use of a synchronous generator driven by a rotating turbine. The combination is called a turbine-generator…. Read more

Dec 10, 2010 | Edvard

Wind Power Turbine Diagram

Historical Review of Power System Stability Problems

System instability reasons As electric power systems have evolved over the last century, different forms of instability have emerged as being important during different periods. The methods of analysis and resolution of stability problems… Read more

Dec 08, 2010 | Edvard

Historical Review of Power System

Time-Current Curves explained in details

How fast a breaker will trip Time-current curves are used to show how fast a breaker will trip at any magnitude of current. The following illustration shows how a time-current curve works. The figures… Read more

Dec 07, 2010 | Edvard

Time-Current Curves

Economic advantages of power factor correction

Penalties? Money lost? Power supply authorities apply a tariff system which imposes penalties on the drawing of energy with a monthly average power factor lower than 0.9. The contracts applied are different from country… Read more

Dec 04, 2010 | Edvard

Economic advantages of power factor correction

Electrical Certificates

In accordance with the wiring regulations There is often confusion about what is commonly referred to as an “Electrical Certificate”. There are essentially 3 types of documents or certificates. Each imply different type of… Read more

Dec 02, 2010 | Edvard

Electrical Certificate, Tests and Report

Electrical Power System Overcurrents

Serving to loads Electrical power systems must be designed to serve  a variety of loads safely and reliably. Effective  control of short-circuit current, or fault current as  it is commonly called, is a major… Read more

Nov 27, 2010 | Edvard

Harmonic Distortion

Harmonic distortion is caused by nonlinear devices in the power system. A nonlinear device is one in which the current is not proportional to the applied voltage. Figure 1 illustrates this concept by the… Read more

Nov 23, 2010 | Edvard

harmonic_distortion

Battery Monitoring And Maintenance

Backup system reliability // Battery monitoring has become a very popular topic, and many companies have either purchased equipment or are in the process of evaluating these systems. This paper discusses why monitoring is… Read more

Nov 21, 2010 | Edvard

Battery Monitoring And Maintenance

The Need for Reactive Power Compensation

Reactive Power Compensation Except in a very few special situations, electrical energy is generated, transmitted, distributed, and utilized as alternating current (AC). However, alternating current has several distinct disadvantages. One of these is the… Read more

Nov 19, 2010 | Edvard

Power Factor Correction

What is the cost of electricity?

Electrification // Electrification in the early 20th century dramatically improved productivity and increased the well-being of the industrialized world. No longer a luxury – now a necessity – electricity powers the machinery, the computers,… Read more

Nov 02, 2010 | Edvard

Cost Of Electricity
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