Gas Concentration of DGA analysis of The transformer

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GAS       NORMAL          ABNORMAL             INTERPRETATION
 H2      < 150 ppm        > 1000 ppm             Arcing corona
 CH4     < 25 ppm        > 80 ppm               Sparking
 C2H6    < 10 ppm        > 35 ppm               Local Overheating
 C2H4    < 20 ppm        > 100 ppm              Severe Overheating
 C2H2    < 15 ppm        > 70 ppm               Arcing
 CO      < 500 ppm       > 1000 ppm             Severe Overloading
 CO2     < 10 000 ppm    > 15 000ppm            Severe Overloading
 O2      0.03 % >         0.5 %                 Combustibles

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