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.