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Monthly Archive for: «August, 2011»


Life Cycle Cost of Transformers

To perform the economical analysis of transformer, it is necessary to calculate its life cycle cost, sometimes called total cost of ownership, over the life span of transformer or, in… Read more

Aug 06, 2011 | By Edvard

Old substation transformers
Energy and Power

Principles for Controlling Harmonics

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. Harmonic distortion is… Read more

Aug 05, 2011 | By Edvard

Variation of the voltage THD over a 1-week period
Industrial Automation

How Stuxnet (PLC virus) spreads – Part 3

Continued from How Stuxnet (PLC virus) spreads – Part 2 » Read here Given the well-secured industrial control system described above, how could a worm like Stuxnet ever penetrate all the… Read more

Aug 03, 2011 | By Edvard

How Stuxnet (PLC virus) spreads

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