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Technical Articles

How to choose transformer rating?

When an installation is to be supplied directly from a MV/LV transformer and the maximum apparent-power loading of the installation has been determined, a suitable rating for the transformer can… Read more

Mar 12, 2011 | Transformers

Tesla’s death, New York Times 1943

Tesla died alone in the hotel New Yorker of heart failure, some time between the evening of January 5 and the morning of January 8, 1943. Despite selling his AC… Read more

Mar 11, 2011 | Energy and Power

Tesla's death, New York Times 1943

How circuit breaker trip unit works?

In addition to providing a means to open and close its contacts manually, a circuit breaker must automatically open its contacts when an overcurrent condition is sensed. The trip unit… Read more

Mar 10, 2011 | Energy and Power

How circuit breaker trip unit works?

Calculating lightning strike distance

Return stroke current magnitude and strike distance (length of the last stepped leader) are interrelated. A number of equations have been proposed for determining the striking distance. The principal ones… Read more

Mar 09, 2011 | Energy and Power

Calculating lightning strike distance

D’Arsonval Meter Movement

The most commonly used sensing mechanism used in DC ammeters, voltmeters, and ohm meters is a current-sensing device called a D’Arsonval meter movement (Figure 1). The D’Arsonval movement is a… Read more

Mar 08, 2011 | Metering

Figure 1 - D’Arsonval Meter Movement

Early years of Nikola Tesla

Nikola Tesla was born “at the stroke of midnight” with lightning striking during a summer storm. He was born in Croatia in the Austro-Hungarian Empire. The midwife commented, “He’ll be… Read more

Mar 05, 2011 | Energy and Power

Nikola Tesla - Early Years

Economics of GIS

The equipment cost of GIS is naturally higher than that of AIS due to the grounded metal enclosure, the provision of an LCC, and the high degree of factory assembly…. Read more

Mar 04, 2011 | High Voltage

SF6 Gas Insulated Substations (GIS) - Mitsubishi Electric


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