A novel on-line SF6 decomposed gases monitoring approach based on quantum-cascade laser absorption spectroscopy

Abstract

In the field of high-voltage electric equipments, the SF6 gas as insulation material is widely used in various kinds of Gas Insulated Switchgears (GIS). And the decomposition of SF6 gas under discharge would generates various kinds of gases, which may seriously result in worse insulation performance of the high-voltage electric power equipment. Thus, it is an urgent issue to monitoring these gases. However, existing inspection methods still fail to conduct on-line monitoring of SF6 decomposed gases. Aimed to solve this problem, this paper proposes an On-line SF6 decomposed gases monitoring approach based on the Quantum-Cascade Laser Absorption Spectroscopy. In this system, the composition and the concentration of each kind of gas can be obtained by testing the absorption peak value and absorption intensity of the wavelength. Experiment results show that the proposed system is able to perform on-line monitoring of SF6 decomposed gases with high accuracy.