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.
Severity Lifespan Model
The Severity-Lifespan Model (SL) provides a means of evaluating
particular transformer risks to enable effective plans to be put in place for
condition recovery. Present theory supports the notion that the transformer
healt…Read More
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 …Read More
Dornenburg's Method
The Dornenburg ratio method
makes use of the ratios of the concentration of the key gases hydrogen,
methane, ethane, ethylene and acetylene. The following ratios are used CH4/H2,
C2H2/CH4, C2H4/C2H6
and C2H2/C2H4. For this…Read More
Case Study - 390 MVA GSU Transformer [1]
Background [2]
On the 15 May 2005
this 390 MVA GSU transformer failed. During the previous unit outage the
transformer oil was purified to remove moisture. The transformer was initially
commissioned in October 197…Read More
Dissolved Gas Analysis Methods
Power transformers play a key role in any power network and must be
maintained and effectively monitored with continuous condition assessment to
ensure reliability of the network. Numerous techniques have been developed ov…Read More
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