NTT DIAGNOSTICS FOR MINERAL OIL

Rogers' Ratios

The advantages to any ratio method are that they are quantitative and independent of transformer oil volume. However, ratio methods can produce incorrect interpretations or none at all. Therefore they should be used in conjunction with other diagnostic methods such as the key gas method. Additionally minimum levels of gases must be present before results of the ratio methods become significant.
Enter PPM values
Hydrogen H2
Methane CH4
Ethane C2H6
Ethylene C2H4
Acetylene C2H2
Carbon Monoxide CO
Carbon Dioxide CO2
Nitrogen N2
Oxygen O2
Rogers' Ratios Diagnostics
CH4/H2 Code=
C2H6/CH4 Code=
C2H4/C2H6 Code=
C2H2/C2H4 Code=
CO/CO2 TCG=




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