The center (centroid) of the irregular polygon drawn from these ve points was then calculated mathematically as indicated be- low, providing a sixth point represented by a blue square in Fig- ure 1. The relative percentage of each gas (8, 34, 50, 8, and 0, respectively) was plotted on its corresponding gas axis, providing ve different points represented as red squares.

In the example in Figure 1, the DGA results were H 2 31 ppm, C 2 H 6 130 ppm, CH 4 192 ppm, C 2 H 4 31 ppm, and C 2 H 2 0 ppm. In this article a new method is presented using 5-gas ratios in a pentagon represen- tation applicable to mineral oillled equipment.Ĭarbon oxides CO and CO 2 are examined separately as in other methods.įor instance the relative percentage of H 2 (ppm of H 2 )(ppm of H 2 CH 4 C 2 H 6 C 2 H 4 C 2 H 2 ).Īn example of the Duval Pentagon representation and calcu- lations used is illustrated in Figure 1.Įach summit of the penta- gon corresponds to one gas, e.g., H 2. These methods use ratios of the ve main hydrocarbon gases formed, namely H 2, CH 4, C 2 H 6, C 2 H 4, and C 2 H 2, either 2-gas ratios, e.g., in IEEE 1 and IEC 2 3-gas ratios, in Duval Triangles 1 to 7 3 or 4-gas ratios in 4. Introduction Several methods are av ailable for the interpretation of dis- solved gas analysis (DGA) results in oil-lled electrical equip- ment. 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 1 and IEC 2 3-gas ratios, in Duval Triangles 1 to 7 3 or 4-gas ratios in 4.Ĭarbon oxides CO and CO2 are examined separately as in other methods.ĭiscover the worlds research 19 million members 135 million publications 700k research projects Join for free Public Full-text 1 Content uploaded by Laurent Lamarre Author content All content in this area was uploaded by Laurent Lamarre on Content may be subject to copyright. Duval Triangle Calculator Upgrade Your Browserĭuval Triangle Calculator Upgrade Your Browser.

Duval triangle calculator