Temperature is a very important factor. A significant portion of the Oxygen is from atmosphere entering through the defects. Carbon dioxide, oxygen, nitrogen (N2), and moisture can also be absorbed from the air, if there is an oil/air interface or if there is a leak in the tank. It also protects the transformer oil and the transformer insulation from reacting with oxygen in the air and deteriorating. In transformers containing nitrogen, the nitrogen is led into the space above the conservator through a pressure reducing valve.
The only exceptions to this are transformers where the oil surface is blanketed with an inert gas, such as nitrogen. Oxygen is available both from the air in contact with the oil surface and to a lesser extent from air dissolved in the oil.

Carbon monoxide and carbon dioxide in transformer oil Basically, CO and CO 2 gases are found in oil, originating from the oxidation of cellulose insulation. Combustible gases like hydrogen H 2 , methane CH 4 , acetylene C 2 H 2 , ethylene C 2 H 4 , and ethane C 2 H 6 are generated by thermal process such as local overheating and in small concentrations due to partial discharge which … Dissolved Gas Analysis of Transformer Oil In today’s modern electric power industry, transformer oil sampling and analysis has begun to enjoy wide popularity. Generally, the gasses found in the oil in service are hydrogen (H 2), methane (CH 4), Ethane (C 2 H 6), ethylene (C 2 H 4), acetylene (C 2 H 3), carbon monoxide (CO), carbon dioxide (CO 2), nitrogen (N 2) and oxygen (O 2). There is one 40MVA oil cooled transformer (yet to commission), filled with 95% oil and we are trying to fill 5% Nitrogen in that transformer so that there should not be any foreign component inside. Transformer oil usually contains oxygen in addition to other gases.

Some of our transformers have a pressurized nitrogen blanket above the oil and, in these cases, nitrogen may be near saturation (see table 8). A good oil analysis program provides equipment owners the ability to determine the current condition of a transformer and schedule prevetive maintenance so as to avoid possible failures in future.

Oxygen and Nitrogen Oxygen and nitrogen will always be present but the amounts will vary with the oil preservation/expansion system, if the oil was recently degassed, and depending on presence of leaks in sealed systems. But even though there is no leakage, nitrogen is not withstanding inside transformer, within a day or two pressure guage is showing 0. vaccum is creating inside automatically.

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