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When should a transformer oil be changed?
Dissolve Gas Analysis of transformer oil should be done annually for 132kv transformer, once in 2 years for the transformer below 132kv transformer, and once in 2 years for the transformer above 132kv transformer.
Why do we change transformer oil?
By changing the oil, the transformer can be checked for problems and cleaned before putting it back into service. Changing the oil in substation transformers requires careful coordination. This process also helps reduce moisture buildup inside the transformer which can cause premature failure if left unchecked.
Do transformers need oil changes?
One of the major services a power transformer needs is oil testing. Transformer oil serves as a coolant in the transformer. The natural processes in the transformer allow it to cool using the oil as insulation in the unit. Proper cooling of the transformer prevents overheating and fires.
What is the life of transformer oil?
In general, a transformer’s service life is determined by its performance characteristics and life expectancy of its dielectric insulating oil which is approximately 20 years.
Which part of transformer We checked in 2 year of period?
The Action to be taken once in 2 years: The calibration of OTI and WTI must be carried once in two years. Tan & delta; measurement of bushings of transformer also to be done once in two years.
How often should you test transformer oil?
Routine testing of transformer oils and insulating oils on a regular schedule is an accepted industry practice. General and physical tests are suggested twice a year, dissolved gas analysis once a year, and Furan testing every 2 years for transformers in operation at least 5 years.
How you will maintain the good condition of transformer oil?
Reclamation of oil with a high acid content includes fuller’s earth treatment to remove acid and particulate, and degasification to remove gasses and water. This process will also correct the acid number and the colour. Transformer oil can hold water particles in suspension depending on the temperature of the oil.
How often should transformers be cleaned?
Items that need to be checked quarterly or every four months: Bushings (clean them and replace if they have cracked) Oil in transformer (not just the levels this time. Quarterly you should check the dielectric strength and water content of the oil.