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Participant

Join Date: Feb 2022
Posts: 4

Transformer Oil Maintenance

02/10/2022 12:57 AM

Hello dear members, I am just curious, what are you usually doing with the transformer oil? Please, pick the answer:

  1. Buy new oil. Maintenance is not worth of thinking about it;
  2. From time to time send samples to the lab, and when it's bad quality - we change it;
  3. We ask service company for a filtration services;
  4. We have the equipment for transformer oil regeneration, degassing, filtration and so on;
  5. Your answer.

Please, describe your answer, so we can understand whether it is important or not

Thank you for your attention,

Anatolii Holub

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Guru

Join Date: May 2010
Location: Liverpool, NY
Posts: 957
Good Answers: 131
#1

Re: Transformer Oil Maintenance

02/10/2022 7:46 AM

Transformer oil, when operating the unit within its design parameters and with proper, regular maintenance and testing, will last the life of the transformer.

Transformer oil should be tested regularly (typically annually) for general oil quality (moisture content, dielectric strength, interfacial tension, acidity, specific gravity, color number) and dissolved combustible gases. This should be trended throughout the transformer's lifetime. If the oil shows a change, then diagnostics and electrical testing need to be done to determine the cause.

Do NOT just change the oil! That is only masking the symptoms, not finding the cause. It could be any of a variety of problems: overheating/overloading, insulation breakdown, corona or other discharge under the oil, arcing, leaks, contamination, oxidation, etc. You have to determine the cause and fix it first. After repair and depending on how badly the oil has deteriorated, you may just choose to keep the same oil and continue to test it regularly, reprocess it to clean it up, or replace it with new oil.

If problems are caught early enough, the oil can continue to be used. Reprocessing may be necessary if the problem was allowed to continue long enough that the oil is severely contaminated or deteriorated. It is very seldom that there is need to totally replace the oil.

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Participant

Join Date: Feb 2022
Posts: 4
#2
In reply to #1

Re: Transformer Oil Maintenance

02/11/2022 1:19 AM

thank you for the answer, that was very helpful

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Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#3

Re: Transformer Oil Maintenance

02/11/2022 6:19 AM

Please define <...2......bad quality...>? Where does the boundary lay?

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Participant

Join Date: Feb 2022
Posts: 4
#4
In reply to #3

Re: Transformer Oil Maintenance

02/11/2022 6:59 AM

When the oil sample fails the BDV or tan/delta or moisture or DGA... testing

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Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 30321
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#5
In reply to #4

Re: Transformer Oil Maintenance

02/12/2022 10:14 AM

And the numbers and units of these TLAs, please?

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