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Category Archive for: «Energy and Power»

Do You Understand What Is Electric Shock?

Electric current passing through the body, particularly alternating current at power frequencies of 50 Hz and 60 Hz, may disrupt the nervous system, causing muscular reaction and the painful sensation of electric… Read more

Jan 02, 2011 | Energy and Power

Electric shock danger sign

Siemens – Busway Purpose and Definition

Commercial and industrial distribution systems use several methods to transport electrical energy. These methods may include heavy conductors run in trays or conduit. Once installed, cable and conduit assemblies are difficult to… Read more

Dec 23, 2010 | Energy and Power

Electrical power can be supplied to any area of a building by connecting standard lengths of busway.

Characteristics of Lightning Strokes

Lightning, one of Mother Nature’s most spectacular events, started to appear significantly demystified after Franklin showed its electric nature with his famous electrical kite experiment in 1752. Although a great deal of… Read more

Dec 19, 2010 | Energy and Power

Characteristics of Lightning Strokes

Sources Of The Electric Energy – Generation

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 | Energy and Power

Wind Power Turbine Diagram

Historical Review of Power System Stability Problems

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 were… Read more

Dec 08, 2010 | Energy and Power

Historical Review of Power System

Time-Current Curves explained in details

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 along the bottom (horizontal… Read more

Dec 07, 2010 | Energy and Power

Time-Current Curves

Economic advantages of power factor correction

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 to… Read more

Dec 04, 2010 | Energy and Power

Economic advantages of power factor correction

Electrical Certificates

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 certification. “Electrical Installation Certificate”… Read more

Dec 02, 2010 | Energy and Power

Electrical Certificate, Tests and Report

Electrical Power System Overcurrents

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 consideration … Read more

Nov 27, 2010 | Energy and Power

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… Read more

Nov 23, 2010 | Energy and Power

harmonic_distortion
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