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

Technical Articles

HGI generator circuit breaker – ABB

The circuit-breakers type HGI can be used as generator circuit-breaker in all types of power plants with unit sizes between 60 – 180 MVA and nominal voltages up to 21kV…. Read more

Apr 05, 2011 | High Voltage

ABB Generator Circuit-Breakers Type HGI

Are renewable resources practical?

While few people disagree that renewable energy is a good idea, most also recognize there are two practical barriers to implementation on a wide scale. First, all renewable energy sources,… Read more

Apr 01, 2011 | Renewable Energy

Are renewable resources practical?

MiCOM P139 – Feeder Management and Bay Control

MiCOM P139 is a cost-effective one-box solution for integrated numerical time-overcurrent protection and control. The unit’s protection functions provide selective short-circuit protection, ground fault protection and overload protection in medium-… Read more

Mar 30, 2011 | High Voltage

MiCOM P139 Feeder Management and Bay Control

Lights up, the facts about lighting!

Illuminance is light falling on a surface measured in footcandles or lux. Distributed with an economic and visual plan, it becomes engineered lighting and, therefore, practical illumination. A lighting designer… Read more

Mar 28, 2011 | Lighting

Lights up, the facts about lighting

Tesla’s view on war

Tesla was opposed to wars in general. Nikola Tesla did devise protective measures that would prevent wars. Tesla found exceptions in some wars and some justifiable situations. Tesla envisioned that… Read more

Mar 25, 2011 | Energy and Power

Nikola Tesla's view on war

Dual nature of light

Light has intrigued humankind for centuries. The most ancient theories considered light as something emitted by the human eye. Later on, it was understood that light should come from the… Read more

Mar 24, 2011 | Lighting

Dual nature of light

Colour classification and temperature

Colour is a subjective psycho physiologic interpretation of the visible electromagnetic spectrum. Luminous sensations or images, produced in our retina, are sent to the brain and interpreted as a set… Read more

Mar 22, 2011 | Lighting

Colour classification according to the C.I.E. chromatic diagram

Protective Grounding Requirements

Each region shall implement procedures to ensure the adequacy of protective grounds and shall periodically review grounding practices at each facility to determine the proper size, length, and number (if… Read more

Mar 19, 2011 | Energy and Power

Personal Protective Ground Cable Assembly

Please, help brave Japan people!

As you already know, Japan is suffering from the greatest disaster since world war 2. A tremendous earthquake, a huge tsunami and now radiation leaks have caused untold damage in… Read more

Mar 18, 2011 | Environment

Please help Japan people

Current transformers (CTs) in a few words

A current transformer is defined as as an instrument transformer in which the secondary current is substantially proportional to the primary current (under normal conditions of operation) and differs in… Read more

Mar 18, 2011 | Transformers

Cross-sectional view of the panel and multifunctional CT

Surge protection of cells and inverter – DC side

Providing power with photovoltaic solar panels is tremendously interesting in the context of renewable energy sources, as regards economical LV photovoltaic systems connected to the public electricity network. Because of… Read more

Mar 17, 2011 | Low Voltage

Surge protection of cells and inverter - DC side


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