Difference analysis of dissolved gas in natural ester insulating fluids under typical electrical and thermal faults: An experimental study

Natural ester insulating oil is widely used in transformers due to its good fire resistance and biodegradability. It mainly composed of triglycerides, there are some differences fatty acid composition content among natural esters. Therefore, the fault diagnosis methods based on dissolved gas analysis different. Three kinds oils study under typical electrical thermal faults power transformers. Thermal from 200°C 800°C with different discharge energies, which include partial discharge, breakdown arc simulated. The characteristic gases their variation trends esters obtained through experimental results. generation characteristics three almost similar, but relative percentages have certain differences. a higher unsaturation degree tends produce more H2 less C2H4. Finally, determine data, Duval pentagon modified improved according