Forms of Separation (2) – Fundamentals
In accordance with the Standard, separation of the various elements of an Assembly: busbars, functional units, terminals, can be claimed providing one or more of the following criteria are met:… Read more
Dec 13, 2010 | Low Voltage
Shielding Of Power Cables
Medium and high-voltage power cables, in circuits over 2000 volts, usually have a shield layer of copper or aluminum tape or conducting polymer. If an unshielded insulated cable is in… Read more
Dec 12, 2010 | Cables
Hydro vs. Wind vs. Solar Power?
Matthew Stein, author of When Technology Fails: A Manual for Self-Reliance, Sustainability, and Surviving the Long Emergency wrestles with that very question in his book. Here’s an excerpt: No single… Read more
Dec 11, 2010 | Hydropower
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… Read more
Dec 10, 2010 | Energy and Power
IEC 62271-200 – HV Switchgear And Controlgear
Part 200: AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV Switchgears are important nodal points in modern power distribution. Correspondingly… Read more
Dec 09, 2010 | High Voltage
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… Read more
Dec 08, 2010 | Energy and Power
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… Read more
Dec 07, 2010 | Energy and Power
Aerodynamics of Horizontal-Axis Wind Turbines
A wind turbine is a device for extracting kinetic energy from the wind. By removing some of its kinetic energy the wind must slow down but only that mass of… Read more
Dec 06, 2010 | Wind Power
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… Read more
Dec 04, 2010 | Energy and Power
Forms of Separation (1) – Introduction
Standard BS EN 60439 Part 1, describes a system for classifying the various forms of separation to be provided principally for: protection against contact with live parts belonging to the… Read more
Dec 04, 2010 | Low Voltage
ePlusMenuCAD 10 RC1 released
Today we released ePlusMenuCAD 10 RC1! Why RC1 (release candidate 1)? Simply because Help is not written yet. It will be added as soon as possible together with releasing of… Read more
Dec 03, 2010 | News
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… Read more
Dec 02, 2010 | Energy and Power
Wind Variability
One of the most critical features of wind generation is the variability of wind. Wind speeds vary with time of day, time of year, height above ground, and location on… Read more
Nov 30, 2010 | Wind Power
Danfoss – Max uptime for wind turbines
Located on top of towers that can extend 80 to 110 meters into the air, wind turbines are subjected to powerful operating forces. And because wind turbines are difficult to… Read more
Nov 29, 2010 | News
ABB invests in renewable energy company
Zurich, Switzerland, November 24, 2010 – ABB, the global power and automation technology group, announced today it has invested about $13 million in Aquamarine Power, a Scottish company that has… Read more
Nov 29, 2010 | News
