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Monthly Archive for: «January, 2014»

MV Circuit Breaker Or Vacuum Contactor? (2)

Continued from first part: MV Circuit Breaker Or Vacuum Contactor? (Part 1) When applied properly, both medium-voltage circuit breakers and medium-voltage fused contactors should provide decades of reliable service. Applied incorrectly, either can lead to major… Read more

Jan 31, 2014 | Mohan Krishnasamy

MV Circuit Breaker Or Vacuum Contactor? PART 2 (on photo: SIEMENS's Sion vacuum circuit-breaker is designed for use in all common types of medium-voltage switchgear)

MV Circuit Breaker Or Vacuum Contactor? (1)

To compare the application of medium-voltage circuit breakers and of fused contactors, we must understand the basic characteristics of each switching technology. Comparison presented here shows the major characteristics of medium-voltage circuit breakers and medium-voltage… Read more

Jan 29, 2014 | Mohan Krishnasamy

Application considerations - Circuit breaker Vs Vacuum contactor (1)

6 Simple Rules to Ensure Substation Safety

Another extremely important substation engineering aspect is associated with safety protection. It is fair to say that safety is always a No. 1 priority in substation design, operation and maintenance. Unlike the case where a… Read more

Jan 27, 2014 | Edvard

6 Simple Rules to Ensure Substation Safety

Dimensioning of Power Distribution Systems (2)

Continued from the first part: Dimensioning of Power Distribution Systems (1) Dimensioning of cable routes and devices follows the maximum load currents to be expected at this distribution level. As a rule: Ib max =… Read more

Jan 24, 2014 | Edvard

Dimensioning of Power Distribution Systems (2)

Dimensioning of Power Distribution Systems (1)

When the basic supply concept for the electricity supply system has been established, it is necessary to dimension the electrical power system. Dimensioning means the sizing rating of all equipment and components to be used… Read more

Jan 20, 2014 | Edvard

Dimensioning of Power Distribution Systems (1)

8 main disadvantages of HVDC transmission

Few weeks back I posted an article about advantages of HVDC over HVAC transmission systems. Advantages of HVDC are numerous and very well recognized, but like everything on this earth this system has other side… Read more

Jan 10, 2014 | Edvard

8 Main Disadvantages of HVDC Transmission

U.S. Renewable Energy – The Facts!

About 82% of the nation’s energy comes from fossil fuels, 8% from nuclear, and 9% from renewable sources. Wind is the fastest growing renewable source, but contributes only 1% of total energy used in the… Read more

Jan 08, 2014 | Edvard

U.S. Renewable Energy - The Facts!

Driving Distributed Energy with Smart Networks

The smart network will set up a virtuous cycle for distributed generators and energy storage devices. It will grow the market by opening up more niches where distributed energy is economically competitive. This growth will… Read more

Jan 03, 2014 | Edvard

Driving Distributed Energy with Smart Networks

Economic Evaluation of Transformer Losses

Transformer losses represent power that cannot be delivered to customers and therefore have an associated economic cost to the transformer user/owner. A reduction in transformer losses generally results in an increase in the transformer’s cost. Depending on… Read more

Jan 01, 2014 | Edvard

Economic Evaluation of Transformer Losses


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