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 different conditions of the transformer based on the three ratios.
Figure 2
Use the following link to the "Analysis"section to get the Rogers Ratio diagnosis of the oil samples. Enter the oil sample under "Sample 5" to get the diagnosis.
Key Gas Method
The key
gas method was initially investigated at Doble laboratories and proposed in 1974
[Pugh73, Pugh74]. Initial comparisons were made to other methods especially
that of the Rogers Ratio Method where the application of th…Read More
Ageing Components and By-products: Organic
The power transformer basic components,
which are organic in nature, are the insulating oil and cellulose based
insulation (paper, insulation boards and blocks) [Heathcote1]. These components form the basis for the transf…Read More
Case Study A: 700 MVA GSU Transformer (GIC) Related
Background:
A 700 MVA GSU transformer indicated increasing gassing trends before shut down in 2004 for an internal inspection. Prior to this incident the transformer was located with a different generating unit and w…Read More
Transformer Life
Power transformers are
generally designed for an operating life of 30 to 35 years. However, depending
on how the transformer is operated, maintained and exposed to external risk
these values may be less. Over the last 20 y…Read More
What is Power Transformer Health?
By
definition, “Health” is the state of being free from illness or injury.
The human
body is made up of different organs and systems, each with its own purpose and
function. These have a limited lifespan. A failure …Read More
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