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

Accurate detection of SF6decomposition characteristics components in SF6 gas insulated equipment is one of the important technical method to realize fault diagnosis and condition monitoring of SF6 gas insulated equipment. In this paper, based on the density functional theory, the infrared spectrum of SOF2 and SO2F2, that is two key SF6 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 SO2F2 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 SF6insulated equipment by mid infrared, and ensure the safety of power equipment.