Abstract
Probing the decomposition products of Sulfur hexafluoride (SF6) under partial discharge provides important information for fault diagnosis of Gas Insulated Switchgear (GIS). Here, the effects of discharging time, gas pressure, and discharging voltage on SF6 decomposition products have been investigated by Fourier transform infrared (FTIR) spectroscopy. The infrared spectra of decomposition products such as CF4, SOF2, and SO2F2 have been obtained. It can be found that the CF4, SOF2, and SO2F2 concentrations increase over increased discharging time up to 96 hours. The SO2F2 concentration increases while the discharging voltage is raised from 20 kV to 46 kV, due to the rapid deceleration to the lower energy of electron capture and dissociative attachment. The SO2F2 concentration is reduced while the gas pressure is increased from 0.3 MPa to 0.4 MPa. The present results about the SF6 decomposition can be useful for electrical fault diagnosis.
Highlights
Sulfur hexafluoride (SF6) has seen wide application in power industry as an insulation material due to its high dielectric strength and outstanding arc-extinguishing performance.[1]
For a gas insulated switchgear (GIS) in standard operating conditions, the GIS chamber is filled with SF6 gas, and it works with the SF6 gas pressure of 0.3 MPa to 0.6 MPa
The main absorption band of CF4 molecules is located in the spectral range of 1280-1290 cm-1.15 Fig. 2(a) shows the infrared spectra of CF4 generated under Partial discharge (PD), with varying discharging time between 30 and 96 hours
Summary
Sulfur hexafluoride (SF6) has seen wide application in power industry as an insulation material due to its high dielectric strength and outstanding arc-extinguishing performance.[1] In particular, pressurized SF6 gas is extensively used in gas insulated switchgear (GIS) to ensure safe and reliable operation. The optical properties of SF6 and its decomposition products under different partial discharge conditions have been studied in the spectral range of 500-4300 cm-1 using FTIR, and a detailed analysis of the influence of discharge time, gas pressure, and discharge voltage on the decomposition products has been performed
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