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Effects of transformer oil reconditioning on DGA

Effects of transformer oil reconditioning on DGA

Effects of transformer oil reconditioning on DGA

(OP)
Hello.

One particular question has tormented me for some time now since I haven't been able to find an assertive answer to it.
How does treating the transformer's oil with a vacuum dehydrator may affect the trend of your DGA, particularly regarding to furan measurements to estimate the degree of polymerization? (effects on combustible gases as well, if any)

RE: Effects of transformer oil reconditioning on DGA

Vacuum dehydration will remove furan and dissolved hydrocarbon gases from oil. But these will again start building up and with in a couple of months(depending on the severity of ageing/fault) the original furan/gas levels will be reached.

RE: Effects of transformer oil reconditioning on DGA

Vacuum treatment hugely affects DGA. A good run should bring gases down to near zero.

Of course, you want to get an analysis immediately after treatment and then again in about a month to see what's going on. You can expect gases to remain low if you do not have ongoing problems in your transformer. Moisture, however, may show a significant rise as moisture entrained in your cellulosic insulation migrates out into the oil to reach equilibribrium.

old field guy

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