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Monthly Archive for: «November, 2011»

Energy and Power

Medium voltage circuit breaker operating sequence

Rated switching sequence according to IEC, O – t – CO – t’ – CO. (cf. opposite diagram): O – Represents opening operation CO – Represents closing operation followed immediately… Read more

Nov 10, 2011 | By Edvard

Automatic reclosing cycle of medium voltage circuit breaker
Transformers

Sources of Sound in Transformers

Unlike cooling-fan or pump noise, the sound radiated from a transformer is tonal in nature, consisting of even harmonics of the power frequency. It is generally recognized that the predominant… Read more

Nov 09, 2011 | By Edvard

Sources of Sound in Transformers
Biomass Energy

Biodiesel – Myths and Facts

Few facts you most probably know already, but never the less to mention: A clean burning alternative fuel, produced from domestic, renewable resources such as plant oils, animal fats, used… Read more

Nov 05, 2011 | By Bipul Raman

Biodiesel cycle
Protection

Transformer Winding Faults

A fault on a transformer winding is controlled in magnitude by the following factors: Source impedance Neutral earthing impedance Transformer leakage reactance Fault voltage Winding connection Several distinct cases arise… Read more

Nov 02, 2011 | By Edvard

transformer-winding-faults-front


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