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Energies 2017, 10(8), 1085; doi:10.3390/en10081085

Correlation Characteristics Comparison of SF6 Decomposition versus Gas Pressure under Negative DC Partial Discharge Initiated by Two Typical Defects

1
School of Electrical Engineering, Wuhan University, Wuhan 430072, China
2
Electric Power Research Institute, Chongqing Power Company, Chongqing 401123, China
3
Electric Power Research Institute, Hainan Power Grid Co., Ltd. Haikou 570100, China
*
Author to whom correspondence should be addressed.
Received: 19 June 2017 / Revised: 15 July 2017 / Accepted: 21 July 2017 / Published: 25 July 2017
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Abstract

Aimed to clarify the correlation characteristics between the internal partial discharge (PD) in negative direct current (DC) gas insulated system (GIS) and gas pressure initiated by two typical defects (i.e., free-metal particles and metal protrusion), this study on PD decomposition of sulfur hexafluoride (SF6) was investigated under different pressures on the basis of constructing a SF6 decomposition experimental platform with DC PD. Free-metal particles and metal protrusion in a GIS were simulated using a spherical-bowl electrode and a needle-plate electrode, respectively. Trends and differences in the performance of SF6 decomposition components SOF2, SO2F2, CO2, and SO2 at different pressures were compared and analyzed by experiments under different defects. Based on gas microscopic ionization theory, the relationship between the decomposition component and gas pressure was deduced and verified. The concentrations of different decomposition components were found to vary with the change in gas pressure under different defects, whereas the characteristic ratios of decomposition components versus gas pressure showed a similar trend. View Full-Text
Keywords: SF6; partial discharge (PD); direct current (DC); gas pressure; metal protrusion defect; free metal particles defect SF6; partial discharge (PD); direct current (DC); gas pressure; metal protrusion defect; free metal particles defect
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Yang, D.; Tang, J.; Yang, X.; Li, K.; Zeng, F.; Yao, Q.; Miao, Y.; Chen, L. Correlation Characteristics Comparison of SF6 Decomposition versus Gas Pressure under Negative DC Partial Discharge Initiated by Two Typical Defects. Energies 2017, 10, 1085.

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