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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… 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)

Application considerations 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… Read more

Jan 29, 2014 | Mohan Krishnasamy

Application considerations - Circuit breaker Vs Vacuum contactor (1)

6 Simple Rules to Ensure Substation Safety

Importance of safety protection 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…. 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) Circuit types Distribution circuit Dimensioning of cable routes and devices follows the maximum load currents to be expected at this distribution level. As… Read more

Jan 24, 2014 | Edvard

Dimensioning of Power Distribution Systems (2)

Dimensioning of Power Distribution Systems (1)

Sizing ratings 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… Read more

Jan 20, 2014 | Edvard

Dimensioning of Power Distribution Systems (1)

Power Transformer Turns Ratio Test

Turns ratio between the windings The turns ratio test is an AC low voltage test which determines the ratio of the high voltage winding to all other windings at no-load. The turns ratio test… Read more

Jan 17, 2014 | Edvard

Power Transformer Turns Ratio Test

8 main disadvantages of HVDC transmission

High Voltage Direct Current (HVDC) 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… Read more

Jan 10, 2014 | Edvard

8 Main Disadvantages of HVDC Transmission
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