Power Substation
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…. Read more
Jan 27, 2014 | By Edvard
Energy and Power
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… Read more
Jan 24, 2014 | By Edvard
Testing and Commissioning
Power Transformer Capacitance and Dissipation Factor Test
The capacitance and dissipation factor test is an AC low voltage maintenance test and is very similar to the power factor test. While the transformer preparation is identical to the… Read more
Jan 22, 2014 | By Edvard
Energy and Power
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… Read more
Jan 20, 2014 | By Edvard
Testing and Commissioning
How to perform a power transformer turns ratio test
Power transformer 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 | By Edvard
Energy Efficiency
Automatic transfer switch (ATS) between two low-voltage utility supplies
Multiple utility services may be used as an emergency or standby source of power. Required is an additional utility service from a separate source and the required switching equipment. Figure… Read more
Jan 15, 2014 | By Edvard
Electric Motor
Calculating the short-circuit current across the terminals of a synchronous generator
Calculating the short-circuit current across the terminals of a synchronous generator is very complicated because the internal impedance of the latter varies according to time. When the power gradually increases, the… Read more
Jan 13, 2014 | By Edvard
High Voltage
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… Read more
Jan 10, 2014 | By Edvard
Energy and Power
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… Read more
Jan 08, 2014 | By Edvard
Low Voltage
Example of MV/LV network structure with dual fed main MV switchboard
Connected to article: Example of standard MV/LV network structure MV consumer substation; The main MV switchboard can be backed up by a generator set and it feeds two MV/LV transformers;… Read more
Jan 06, 2014 | By Edvard
Energy and Power
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… Read more
Jan 03, 2014 | By Edvard
Transformers
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… Read more
Jan 01, 2014 | By Edvard
Transformers
Large power transformer tailored to customers’ specifications
An LPT (Large Power Transformer) is a large, custom-built piece of equipment that is a critical component of the bulk transmission grid. Because LPTs are very expensive and tailored to… Read more
Dec 30, 2013 | By Edvard
Smart Grid
Comparison of major power grid failures in US and around the world (2)
Continued from first part: Comparison of major grid failures in United States and around the world (part 1) On the International side, about 1/5 of the power outages (9 of… Read more
Dec 27, 2013 | By Edvard
Smart Grid
Comparison of major power grid failures in US and around the world (1)
The creation and delivery of power is one basic infrastructure expected by all modern industrial societies. Power distribution basics started in the US in the early 1900s when the first… Read more
Dec 25, 2013 | By Edvard
