IEC_60599_O2_TO_N2_GAS_RATIO

Formula

=IEC_60599_O2_TO_N2_GAS_RATIO(dga)

Description

Performs an interpretation of the DGA based on the ratio of Oxygen(O2) to Nitrogen(N2).

Refer to IEC 60599:2022, Section 5.6 - O2/N2 ratio, page 15

Output

The outcome of the application of this rule.

5.6 O2/N2 ratio, Analysis for sample taken on Tue Feb 28 2023 
  Oxygen to Nitrogen ratio, Dissolved O2 and N2 are found in oil as a result of contact with atmospheric air in the conservator of air-breathing equipment, or through leaks in sealed equipment. At equilibrium with air, the concentrations of O2 and N2 in oil are approximately 32 000 ppm and approximately 64 000 ppm, respectively, and the O2/N2 ratio is approximately 0,5.
          
          In service, this ratio may decrease as a result of oil oxidation and/or paper ageing, if O2 is consumed more rapidly than it is replaced by diffusion. Factors such as the load and preservation system used may also affect the ratio, but with the exception of closed systems, ratios less than 0.3 (0.25 in this case) are generally considered to indicate excessive consumption of oxygen.