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Monthly Archive for: «November, 2010»

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 the earth’s… Read more

Nov 30, 2010 | Edvard

wind_turbines_farm-big

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 access for… Read more

Nov 29, 2010 | Edvard

danfoss-sensors

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 developed technology… Read more

Nov 29, 2010 | Edvard

waves

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 depend on… Read more

Nov 28, 2010 | Edvard

Transformer Cooling Classes

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 be the… Read more

Nov 27, 2010 | Edvard

solar-invest

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 major consideration … Read more

Nov 27, 2010 | Edvard

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 this test… Read more

Nov 26, 2010 | Edvard

Megger

Harmonic Distortion

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. Figure 1 illustrates this concept… Read more

Nov 23, 2010 | Edvard

harmonic_distortion

Battery Monitoring And Maintenance

Battery monitoring has become a very popular topic, and many companies have either purchased equipment or are in the process of evaluating these systems. This paper discusses why monitoring is important, and… Read more

Nov 21, 2010 | Edvard

Battery Monitoring And Maintenance

The Need for Reactive Power Compensation

Except in a very few special situations, electrical energy is generated, transmitted, distributed, and utilized as alternating current (AC). However, alternating current has several distinct disadvantages. One of these is the necessity… Read more

Nov 19, 2010 | Edvard

Power Factor Correction
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