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Archive: Category «Transformers»

What Standards To Use For Transformer Oil Testing?

ASTM (American Society for Testing and Materials) has developed the standards for oil testing. The following tests we recommended for a complete analysis of a transformer’s oil: The dielectric breakdown…...

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Nov 15, 2011 | Edvard

ASTM standards for transformer oil testing and complete analysis of a transformer’s oil

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 | Edvard

Sources of Sound in Transformers

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 | Edvard

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Transformer Testing Techniques

Cant see this video? Click here to watch it on Youtube. Substation transformers can range from the size of a garbage can to the size of a small house; they… Read more

Oct 27, 2011 | Edvard

Diagnosing Transformer Winding Insulation (video)

This video tutorial shows the progression of power factor or dissipation factor over frequency. Furthermore, measuring transformer winding insulation, including the connection of measuring leads, is explained. Reasons why recording… Read more

Sep 25, 2011 | Edvard

Understanding Transformer Polarity

With power or distribution transformers, polarity is important only if  the need arises to parallel transformers to gain additional capacity or to  hook up three single-phase transformers to make a… Read more

Sep 23, 2011 | Edvard



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