Investigation on SF6 spark decomposition characteristics under different pressures

The decomposition characteristics of SF6 gas-insulated equipment remarkably vary under different working pressures (0.3-0.7 MPa). Thus, the influence of pressure should be considered when adopting decomposed components for spark discharge fault diagnosis. A series of experiments on SF6 spark dischar...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2017, Vol.24 (4), p.2066-2075
Main Authors: Tang, Ju, Rao, Xiajin, Tang, Bowen, Liu, Xin, Gong, Xun, Zeng, Fuping, Yao, Qiang
Format: Article
Language:English
Subjects:
Computer simulation
decomposed component
Decomposition reactions
Discharges (electric)
effective generation rate
Electric sparks
Electrodes
Energy of dissociation
Fault diagnosis
influence rule
Ions
pressure
Regression analysis
Relays
SF6
spark discharge
Sparks
Sulfur hexafluoride
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Summary:The decomposition characteristics of SF6 gas-insulated equipment remarkably vary under different working pressures (0.3-0.7 MPa). Thus, the influence of pressure should be considered when adopting decomposed components for spark discharge fault diagnosis. A series of experiments on SF6 spark discharge decomposition under various pressures were performed on the spark discharge simulation experimental platform. The influence of pressure on SF6 spark discharge decomposed components were analyzed quantitatively combined with molecule chemical decomposition mechanisms. Results show that the species of spark decomposed components do not vary under different pressures. However, pressure directly affects the accumulated energy of the electrons in the spark channel, leading to diverse dissociation intensities of electrons on SF6. This phenomenon further affects the rate of neutral-neutral molecule and ion-molecule reactions responsible for the decomposed components. Finally, the yields and effective generation rates of decomposed components CF4, SOF4, SO2F2, SOF2, and SO2 decline with varying degrees under increasing pressure. Moreover, mathematic regression equations were derived for the effective generation rates of the components influenced by pressure.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2017.006326