Effect of Metal Fouling on Insulator Surface on the Decomposition Characteristics of SF/N Gas Mixture

SF/N gas mixture applied in gas insulated equipment can reduce the greenhouse effect of pure SF gas. This paper investigates the partial discharge decomposition of SF/N gas mixtures under metal fouling on insulator surfaces. The results show that the decomposition products are SOF, SOF, SO, NO, NF and CF, the generation of which increases with the increase of the discharge time, but the generation of SOF is much higher than that of SOF. the generation of SOF, SO, NO and NF shows a linear saturation trend with the increase of the discharge volume. the generation of CF increases with the increase of the PD intensity. The generation of CF shows a linear trend with the increase of PD intensity, which can be used as a characteristic product to characterize the fault severity of insulator metal surface fouling defects.