Case Study: Investigation into Combustible Gases in Selector of Tap Changer

The following report highlights the problem of the production of combustible gases in the selector of the tap changer of gen/motor transformer 1 at A Pumped Storage Scheme.  This may be caused either by abnormal arcing or a leak between the diverter and selector compartments. INTRODUCTION From the oil results in 2002 it was noticed that there was an increase...

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Rogers Ratio Method

The Rogers Ratio method is another ratio method very similar to the Dornenburg method however only having the three ratios R1:CH4/H2, R2:C2H2/C2H4, R5:C2H4/C2H6. IEEE standard C57.104 has the following flowchart to explain the process. Figure 1 Figure 2 below also taken from IEEE standard C57.104 provides a tabular list of the...

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An Effective Asset Management Strategy for Power Transformer Health

INTRODUCTION A major challenge to transformer engineers of power utilities and major industries is the management of an ageing transformer fleet. Predicting transformer failure is as unpredictable as that of predicting share prices in the market. This makes it difficult to effectively plan mitigation strategies to reduce the impact of such failures. The other challenge...

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