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Archive: Category «Energy and Power»

Autotransformers in few words

It is possible to obtain transformer action by means of a single coil, provided that there is a “tap connection” somewhere along the winding. Transformers having only one winding are… Read more

Aug 19, 2011 | Edvard

Autotransformers in few words

Whole-House Protection Strategy

No single SPD (Surge Protection Strategy) can protect all the equipment in a residence from all causes of electrical surges. Instead, a whole-house protection strategy, consisting of point-of-entry and point-of-use… Read more

Aug 13, 2011 | Edvard

SIEMENS - Whole-House Protection Strategy

Principles for Controlling Harmonics

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. Harmonic distortion is… Read more

Aug 05, 2011 | Edvard

Variation of the voltage THD over a 1-week period

DC to AC Transfer – Measurement

General transfer capability is essential to the measurement of voltage, current, power, and energy. The standard cell, the unit of voltage which it preserves, and the unit of current derived… Read more

Jul 30, 2011 | Edvard

Resistive heating explained in details

Whenever an electric current flows through a material that has some resistance (i.e., anything but a superconductor), it creates heat. This resistive heating is the result of “friction,” as created… Read more

Jul 27, 2011 | Edvard

Materials with magnetic properties

All materials have magnetic properties. These characteristic properties may be divided into five groups as follows: Diamagnetic Paramagnetic Ferromagnetic Antiferromagnetic Ferrimagnetic Only ferromagnetic and ferrimagnetic materials have properties which are… Read more

Jul 26, 2011 | Edvard

Fig. 3.2 Magnetization and hysteresis curves

Fire Protection Measures

The measures to mitigate or lessen fire hazards are normally called “fire protection measures”. The National Fire Protection Association NFPA (U.S. organization charged with creating and maintaining minimum standards and… Read more

Jul 13, 2011 | Edvard

Fire Protection Measures


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