CO in Transformer Oil
CO in Transformer Oil
(OP)
Hi! Just a weird one. Is it possible to have more CO than CO2 when doing an DGA on a regular transformer oil? Possible causes?
Thanks all!
Thanks all!
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RE: CO in Transformer Oil
Both are also secondary indicators of Arcing if the fault involves cellulose.
Sarg
RE: CO in Transformer Oil
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RE: CO in Transformer Oil
See http://
RE: CO in Transformer Oil
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RE: CO in Transformer Oil
"...thermal decomposition of the cellulose insulation occurs at much lower temperatures than that for decomposition of oil and at rates exponentially proportional to the temperature. Because the paper begins to degrade at normal operating temperature in the transformer, its gaseous byproducts are found at normal operating temperatures in the transformer...."
"..The ratio of CO2/CO is sometimes used as an indication of thermal decomposition of the cellulose. The ratio is normally more than seven. For the CO2/CO ratio, the respective values should exceed 5000 and 500 to improve the certainty factor i.e. the ratios are sensitive to minimum values. As the magnitude of CO increases, the ratio of CO2/CO decreases. This may indicate that an anomly is occuring within the transformer"
I'm not sure exactly what it means except perhaps they place more emphasis on CO as an indicator of actual abnormal thermal degradation whereas CO2 levels may become high without an anomaly, especially for GSU type transformers which operate almost continuously at full load. Or maybe I am misunderstanding... draw your own conclusions.
I agree resample is always helpful and also can you tell us all the results?
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