Research on SF6 Field Detection Technology Based on Optical Method

Abstract

SF6 gas is widely used in electrical equipment, but it is inevitable that failure will occur. However, the current diagnostic methods have the disadvantages of slow response speed, high requirements for the detection environment, and detection of exhaust gas pollution to the atmosphere. Based on this, this paper studies the SF6 decomposition product detection technology based on optical method, including SF6 purity detection based on infrared absorption, SO2 detection based on ultraviolet fluorescence and H2S and CO detection technology based on TDLAS (Tunable Diode Laser Absorption Spectrum). Furthermore, the "zero emission" detection device was developed to perform calibration, temperature and flow compensation, and various gas detection tests. The results showed that the accuracy of SF6 purity detection data was within 0.04%, and the detection accuracy of H2S and SO2 was within 2%. The detection accuracy of CO is within 1%, which complies with relevant testing standards. . The developed equipment has the characteristics of high detection accuracy, short response time, safety and environmental protection.