Relationship between decomposition gas ratios and partial discharge energy in GIS, and the influence of residual water and oxygen

Tang, Ju; Zeng, Fuping; Zhang, Xiaoxing; Pan, Jianyu; Yao, Qiang; Hou, Xingzhe; Tang, Yang

doi:10.1109/tdei.2014.6832269

Cited by 43 publications

(34 citation statements)

References 20 publications

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“…Although SOF 2 can be hydrolyzed, it is relatively stable. Based on the above research results, H 2 S, SO 2 , SOF 2 , and SO 2 F 2 were chosen as the characteristic components of SF 6 decomposition under PD to conduct the analysis of online monitoring [21,23].…”

Section: The Current Developments Of the Sf 6 Decomposition Mechanismmentioning

confidence: 99%

The SF6 Decomposition Mechanism: Background and Significance

Zhang¹,

Tang²,

Xiao³

et al. 2017

Nanomaterials Based Gas Sensors for SF6 Decomposition Components Detection

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Gas Insulated Switchgear (GIS) has been widely used in substations. The insulating medium used in GIS is sulfur hexaluoride (SF 6 ) gas. However, the internal insulation defect existed in GIS would inevitably lead to partial discharge (PD), and cause the composition of SF 6 to SOF 2 , SO2F 2 and SO 2 and other characteristic component gases. The decomposition phenomenon would greatly reduce the insulation performance of SF 6 insulated equipment, and even paralyze the whole power supply system. In this chapter, we irst discuss the objective existence, decomposition mechanism and harmness of insulation defects. Then the methods for insulation defects detection used to avoid the insulation accidents are introduced. Comparing all of the detection methods, diagnosing the insulation defect through analyzing the decomposed gases of SF 6 by chemical gas sensors is the optimal method due to its advantages, such as high detection accuracy and stability, signifying the importance of developing chemical gas sensor used in SF6 insulated equipment. In conclusion, there kinds of gas sensor material, carbon nanotubes, graphene, are chosen as the gas sensing materials to build speciic gas sensors for detecting each kind of SF 6 decomposed gases, and then enhance the gas sensitivity and selectivity by material modiication.

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Section: The Current Developments Of the Sf 6 Decomposition Mechanismmentioning

confidence: 99%

The SF6 Decomposition Mechanism: Background and Significance

Zhang¹,

Tang²,

Xiao³

et al. 2017

Nanomaterials Based Gas Sensors for SF6 Decomposition Components Detection

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“…The characteristic components of SF6 were separated and quantitatively detected using Shimadzu QP-2010Ultra gas chromatography (GC/MS) with special capillary column (CP-Sil5CB). The specific experimental steps are described in references [10,12]. …”

Section: Experimental Research Platformmentioning

confidence: 99%

“…Most of the previous studies have focused on the influence of discharge energy, electrode material, trace oxygen, and trace water [8][9][10]. Only a few studies have conducted a qualitative research and description on the effect of pressure [11,12].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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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 (SF 6 ) was investigated under different pressures on the basis of constructing a SF 6 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 SF 6 decomposition components SOF 2 , SO 2 F 2 , CO 2, and SO 2 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.

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“…Hence, the formation of SOF 4 is promoted. Meanwhile, reactions (6) to (11) and (13) to (15) constitute a comprehensive reaction, which is the means by which SO 2 F 2 is generated. The generation capacity for SO 2 F 2 is determined by trot reaction (15), and with the increasing concentration of H 2 O, the amount of SO 2 F 2 will slightly increase.…”

Section: The Influence Mechanism Of H 2 O and O 2 On The Characteristmentioning

confidence: 99%

“…High local electromagnetic energy caused by PD would cause SF 6 to decompose into several kinds of low-fluoride sulfide SF x [1][2][3][4]. If trace levels of H 2 O and O 2 exist in the equipment, the decomposed components would have further reactions with them and produce new characteristic components, such as SO 2 F 2 , SOF 2 , SO 2 , and so on [5][6][7][8][9][10][11]. The concentration and variation regularity of these characteristic components have close relationship with the patterns of insulation faults, as well as the trace levels of H 2 O and O 2 in gaseous SF 6 , making it more difficult to recognize the internal insulation deficiency when using them.…”

Section: Introductionmentioning

confidence: 99%

Experimence Study of Trace Water and Oxygen Impact on SF₆Decomposition Characteristics Under Partial Discharge

Zeng¹,

Tang²,

Xie³

et al. 2015

Journal of Electrical Engineering and Technology

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-It is common practice to identify the insulation faults of GIS through monitor the contents of SF 6 decomposed components. Partial discharges (PD) could lead to the decomposition of SF 6 dielectric, so new reactions usually occur in the mixture of the newly decomposed components including traces of H 2 O and O 2 . The new reactions also cause the decomposed components to differ due to the different amounts of H 2 O and O 2 even under the same strength of PD. Thus, the accuracy of assessing the insulation faults is definitely influenced when using the concentration and corresponding change of decomposed components. In the present research, a needle-plate electrode was employed to simulate the PD event of a metal protrusion insulation fault for two main characteristic components SO 2 F 2 and SOF 2 , and to carry out influence analysis of trace H 2 O and O 2 on the characteristic components. The research shows that trace H 2 O has the capability of catching an F atom, which inhibits low-sulfide SF x from recombining into high-sulfide SF 6 . Thus, the amount of SOF 2 strongly correlates to the amount of trace H 2 O, whereas the amount of SO 2 F 2 is weakly related to trace H 2 O. Furthermore, the dilution effect of trace O 2 on SOF 2 obviously exceeds that of SO 2 F 2 .

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Relationship between decomposition gas ratios and partial discharge energy in GIS, and the influence of residual water and oxygen

Cited by 43 publications

References 20 publications

The SF6 Decomposition Mechanism: Background and Significance

The SF6 Decomposition Mechanism: Background and Significance

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

Experimence Study of Trace Water and Oxygen Impact on SF₆Decomposition Characteristics Under Partial Discharge

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Relationship between decomposition gas ratios and partial discharge energy in GIS, and the influence of residual water and oxygen

Cited by 43 publications

References 20 publications

The SF6 Decomposition Mechanism: Background and Significance

The SF6 Decomposition Mechanism: Background and Significance

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

Experimence Study of Trace Water and Oxygen Impact on SF6Decomposition Characteristics Under Partial Discharge

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Experimence Study of Trace Water and Oxygen Impact on SF₆Decomposition Characteristics Under Partial Discharge