Research on Gas Diffusion Behavior in Three-Element Mixed Insulation Oil-Paper Composite System
摘要
The gas information in oil-immersed transformers is an important parameter in the identification of the insulation condition Three-element mixed insulation oil is a new type of insulating liquid, which has been safely used in transformer insulation systems. There is an urgent need to develop fault diagnosis method for three-element mixed insulation oil transformers. In this paper, the transfer characteristics of different types of gases between oil and paper insulation in the three-element mixed insulation oil-cellulose system are studied through simulation. The results show that when the initial position of gas is in the cellulose, the greater the absorption force between cellulose and gas, the more difficult for the gas to transfer from the cellulose to oil. When the initial position of gas is in the three-element mixed insulation oil, the larger the free volume fraction of gas molecules in oil and cellulose, the easier gas transfers from three-element mixed insulation oil to cellulose. The conclusions contribute to improving the accuracy of the fault diagnosis for three-element mixed insulation oil transformers based on dissolved gas analysis.