Читать книгу Alternative Liquid Dielectrics for High Voltage Transformer Insulation Systems - Группа авторов - Страница 60

There are several methods to infer the DGA results of a transformer, with some of them listed below. The most important hydrocarbon gases are methane (CH₄), ethane (C₂H₆), hydrogen (H₂), ethylene (C₂H₄), and acetylene (C₂H₂). These gases are taken into consideration when analyzing the gas ratios in IEC, Rogers, Doernenburg, and Duval’s triangle methods. All these gas ratio methods indicate the types of faults likely to occur in a transformer after the oils are subjected to thermal or electrical stress. The five gas ratios according to standard are: Ratio 1 (R1) = CH₄/H₂, Ratio 2 (R2) = C₂H₂/C₂H₄, Ratio 3 (R3) = C₂H₂/CH₄, Ratio 4 (R4) = C₂H₆/C₂H₂, and Ratio 5 (R5) = C₂H₄/C₂H₆.