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Learn about power engineering and HV/MV/LV substations. Study specialized technical articles, papers, and electrical engineering video courses.

Archive: Category «Energy and Power»

Natural Ventilation Of Power Substation

The operation of a system of natural ventilation is as a result of a decrease in air density as its temperature is raised due to the heat gain from various sources. This decrease in air… Read more

Oct 18, 2013 | Edvard

Natural Ventilation Of Power Substation

General Arrangement of Hydropower Powerhouse

In general, a powerhouse in hydropower plant may be divided into three areas: The main powerhouse structure, housing the generating units and having either separate or combined generator and turbine room, Erection bay, and Service… Read more

Oct 16, 2013 | Edvard

General Arrangement of Hydropower Powerhouse

An Overview Of Grounding System (Grounded)

Continued from technical article: An Overview Of Grounding System (Ungrounded) Solidly grounded system Resistance grounded system Reason for resistance grounding System earthing at EHV level Let us assume that R phase (Phase-3 in figure-3) is… Read more

Oct 14, 2013 | Asif Eqbal

An Overview Of Grounded Grounding System

An Overview Of Grounding System (Ungrounded)

Ungrounded system Derivation of current expression in ungrounded system Advantages & disadvantages of ungrounded system Concept of effective and non-effective grounding Coefficient of earthing and earth fault factor Before 1950 power system were often without… Read more

Oct 11, 2013 | Asif Eqbal

An Overview Of Grounding System (Ungrounded)

4 General Safety Practices To Remember ALWAYS!

In addition to the safety precautions (access to HV enclosures and work on HV electrical equipment) the following general safety practices should be ALWAYS observed for work on electrical equipment. The scope of work and… Read more

Oct 09, 2013 | Edvard

4 General Safety Practices To Remember ALWAYS When Working On Electrical Equipment

Heat vs. Current in a Resistor

It is converted from one form to another. One of the most familiar forms of energy is heat. When a current (I) is forced through a resistor (R) by applying a potential (V), the electrical… Read more

Oct 04, 2013 | Edvard

Heat vs. Current in a Resistor (photo by Karen Blaha via Flickr)

What Is a Good Ground Resistance Value?

The goal in ground resistance is to achieve the lowest ground resistance value possible, that makes sense economically and physically, when contacting the earth, also known as the soil/ground rod interface. Ideally, a ground should… Read more

Oct 02, 2013 | Edvard

What Is a Good Ground Resistance Value?

An Overview Of Control (Ice Cube) Relays

An electromechanical relay is an electrical switch actuated by an electromagnet coil. As switching devices, they exhibit simple “on” and “off” behavior with no intermediate states. The electronic schematic symbol for a simple single-pole, single-throw… Read more

Sep 18, 2013 | Edvard

An Overview Of Control (Ice Cube) Relays

Comparison Of Neutral Earthing Methods

Neutral earthing systems are very similar to circuit breakers in that they do nothing until something in the system goes wrong! There are several methods for system earthing which can be generally divided into three… Read more

Sep 16, 2013 | Edvard

Comparison Of Neutral Earthing Methods


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