Abstract
The goal of this project is to figure out the influence rules of trace H2O on SF6 (sulfur hexafluoride) decomposition characteristics components under spark discharge, using a needle-plane model. The latter model was used to simulate metal protrusion insulation defect, and conduct a series of experiments on spark discharge decomposition with different H2O contents. Finally, the changing rules and mechanism of five decomposition characteristic components were achieved, which indicates that no matter how much H20 is present, SF6 can decompose into five main decomposition components, that is CF4, SOF2, SO2, SOF4, SO2F2. And the contents of all these decomposition components increase with the time extended, and makes the order of SF6 spark decomposition after 10 hours discharging as follows: SOF2>SO2F2> SOF4>SO2,> Cf 4. In addition, the higher the H2O content is, the stronger promoting effect on producing S02F2, SOF2 and S02 is. The data were obtained from my experiment, and the original results. The fitting data were generated by the software OriginLab© OriginPro, and electrical field intensity simulation was completed by ANSYS. A series of SF6 spark discharge experiments under different H2O contents were conducted to obtain the correlation properties between SF6 characteristic decomposition components and trace H2O. In addition, preliminary experiments explore influence rules of trace H2O on SF6 characteristic decomposition components contents. This provides experimental and theoretical basis for setting up and improving the utilization of SF6 decomposition characteristic components in electrical equipment insulation defect on-line monitoring and fault diagnosis.