![]() ![]() ![]() The same is done for each of the other 4 gases. The relative percentage of H2 is plotted on the axis between the pentagon center (0% H2) and the pentagon summit for H2 (100% H2). Each summit of the pentagon corresponds to one gas, e.g., H2. An example of the Duval Pentagon representation and calculations used is illustrated in Figure 1. For instance the relative percentage of H2 = (ppm of H2)/(ppm of H2 + CH4 + C2H6 + C2H4 + C2H2). The Duval Pentagon In the new Duval Pentagon representation, the relative percentages of the five main hydrocarbon gases analyzed by DGA are first calculated. Carbon oxides CO and CO2 are examined separately as in other methods. In this article a new method is presented using 5-gas ratios in a “pentagon” representation applicable to mineral oil–filled equipment. These methods use ratios of the five main hydrocarbon gases formed, namely H2, CH4, C2H6, C2H4, and C2H2, either 2-gas ratios, e.g., in IEEE and IEC 3-gas ratios, in Duval Triangles 1 to 7 or 4-gas ratios in. Introduction Several methods are available for the interpretation of dissolved gas analysis (DGA) results in oil-filled electrical equipment. The Duval Pentagon-A New Complementary Tool for the Interpretation of Dissolved Gas Analysis in Transformers Key words: transformer, dissolved gas analysis, pentagon ![]()
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