transformer oil sampling

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hi there...
i have some question about transformer oil smpling procedure.
Does anyone know transformer oil sampling is to be performed when the transformer is energized, or when it is de-energized?
Any effect on the sample?
Thanks!

3/23/0510:15 PM

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Original Post

dcandersonMember

The Transformer Maintenance Guide put out by TMI says, never sample Current Transformers (CT's)energized and extreme caution should be taken when sampling energized transfomers. Based upon that, I would think the analysis would be the same (energized/unenergized) only the risk for the indiviual would be greater.

3/24/0511:50 PM

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