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Technical Articles

High Voltage

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 | By Edvard

IEC 62271-200
Energy and Power

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 | By Edvard

Historical Review of Power System
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 | By Edvard

Time-Current Curves
Energy and 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 | By Edvard

Economic advantages of power factor correction
Low Voltage

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 | By Edvard

Forms Of Separation - Introduction
News

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 | By Edvard

ePlusMenuCAD
Energy and Power

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 | By Edvard

Electrical Certificate, Tests and Report
Wind 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 | By Edvard

wind_turbines_farm-big
News

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 | By Edvard

danfoss-sensors
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 | By Edvard

waves
Transformers

Transformer Cooling Classes

Since no transformer is truly an “ideal” transformer, each will incur a certain amount of energy loss, mainly that which is converted to heat. Methods of removing this heat can… Read more

Nov 28, 2010 | By Edvard

Transformer Cooling Classes
Solar Power

Should You Invest in Solar Power?

Solar power is quickly gaining popularity all over the globe. It is growing at a rate of 2% per year, and if the figures continue to grow, solar energy will… Read more

Nov 27, 2010 | By Edvard

solar-invest
Energy and Power

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… Read more

Nov 27, 2010 | By Edvard

Metering

Megger Tests

The insulation resistance meter test method for determining the condition of electrical insulation has been widely used for many years as a general nondestructive test method. A serious limitation of… Read more

Nov 26, 2010 | By Edvard

Megger


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