Identification of Stray Gassing of Dodecylbenzene in Bushings

Several high voltage condenser type OIP (oil impregnated paper) bushings used in the electrical industry are filled with dodecylbenzene, because of its ability to absorb hydrogen formed by corona partial discharges thick paper insulation these pieces equipment. Some them form large quantities ethane, raising concern overheating faults their insulation, which may be risky for safe operation service. The article presents dissolved gas analysis results oil samples taken from ethane formation, together laboratory tests stray gassing dodecylbenzene performed according CIGRE procedure. By using Duval Pentagon 2 it is possible compare patterns and evaluate temperature range defects. Stray gassing/overheating within whatever other causes, not a observations published CIGRE.