An investigation of infrared spectrum of SOF2 and SOF2 based on the density functional theory

Accurate detection of SF ₆ decomposition characteristics components in SF ₆ gas insulated equipment is one of the important technical method to realize fault diagnosis and condition monitoring of SF ₆ gas insulated equipment. In this paper, based on the density functional theory, the infrared spectrum of SOF2 and SO ₂ F ₂ , that is two key SF ₆ sulfur-containing decomposition characteristics components, were simulated and analyzed. The research found that the infrared spectrum of SOF2 molecule included four main absorption peaks at 485.106 cm ^-1 , 678.479 cm ^-1 , 748.357 cm ^-1 , and 1295.070 cm ^-1 , respectively. And the infrared spectrum of SO ₂ F ₂ molecule included five main absorption peaks at 501.852 cm ^-1 , 779.442 cm ^-1 , 814.284 cm ^-1 , 1221.181 cm ^-1 , and 1460.246 cm ^-1 , respectively. This study lay a theoretical foundation for fault diagnosis and condition monitoring of SF ₆ insulated equipment by mid infrared, and ensure the safety of power equipment.