Analysis of PD-generated SF/sub 6/ decomposition gases adsorbed on carbon nanotubes

Ding, Weidong; Hayashi, Ryosuke; Ochi, Kenji; Suehiro, Junya; Imasaka, Kiminobu; Hara, Masanori; Sano, Noriaki; Nagao, E.; Minagawa, Tadao

doi:10.1109/tdei.2006.258191

Cited by 65 publications

(44 citation statements)

References 22 publications

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“…With the rapid development of nano-sensing technology, the gas sensor method to detect SF 6 decomposition components has become the trend of research hotspot [31][32][33]. Study of the gas sensor method to detect SF 6 decomposition components not only enriches and develops the new method of online monitoring, but also has important engineering signiicance and broad application prospects of realizing online monitoring of SF 6 decomposition components in gas-insulated equipment and its condition-based maintenance.…”

Section: The Signiicance Of Gas-sensing Materials On Online Monitoringmentioning

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 Signiicance Of Gas-sensing Materials On Online Monitoringmentioning

confidence: 99%

The SF6 Decomposition Mechanism: Background and Significance

Zhang¹,

Tang²,

Xiao³

et al. 2017

Nanomaterials Based Gas Sensors for SF6 Decomposition Components Detection

View full text Add to dashboard Cite

show abstract

“…Unlike the pulse current and ultra-high frequency methods of detecting partial discharge (PD) and diagnosing insulation status, the method based on SF 6 decomposition characteristics is a highly promising method of monitoring the inner insulation faults of gas-insulated equipment, such as gas-insulated switchgear (GIS), transformer and line [1][2][3][4]. This method is also free of electromagnetic interference, and its insulation fault can be recognised qualitatively and quantitatively.…”

Section: Introductionmentioning

confidence: 99%

“…This method is also free of electromagnetic interference, and its insulation fault can be recognised qualitatively and quantitatively. PDs are generally generated from gas-insulated equipment before the occurrence of faults (e.g., insulation breakdown and flashover) caused by insulation defects [5][6]. In this case, the SF 6 insulation medium in the gas chamber decomposes and produces a series of characteristic products under the high pulsed electromagnetic energy of PDs.…”

Section: Introductionmentioning

confidence: 99%

“…The content and variation regularity of these characteristic components can effectively represent the PD pattern, severity and developing tendency of the insulation fault [7][8]. The International Council on Large Electric Systems has established the WGB3-25 work group, which is designed to formulate guidelines for the SF 6 analysis of the diagnosis of the insulation faults of GIS or other SF 6 -insulated equipment.…”

Section: Introductionmentioning

confidence: 99%

“…The metal material in the discharge area can react with primary decomposed products (low fluoride SF x ) and react into metal fluorides [11,12]. Nevertheless, given that SF x is the key factor in the formation of the final decomposed products of SF 6 , such as SO 2 F 2 and SOF 2 , the difference in the metal electrode material can significantly affect the SF 6 decomposition characteristics. If the difference in the metal electrode material is disregarded and the information of the decomposed component is directly exploited to diagnose the SF 6 electrical equipment, an assessment deviation is inevitably produced; misjudgement may even arise in serious conditions.…”

Section: Introductionmentioning

confidence: 99%

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Influence Regularity of Aluminum, Copper and Stainless-steel on SF₆ PD Decomposition Characteristics Components

Zeng¹,

Luo²,

Tang³

et al. 2017

Journal of Electrical Engineering and Technology

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-SF 6 decomposition products can be used to detect partial discharge (PD), but the metal materials in a PD area can significantly affect SF 6 decomposition characteristics. Disregarding the effect of metal materials on such characteristics inevitably result in certain errors when using them to diagnose the internal insulation faults of gas-insulated switchgears. This paper investigates the influence regularity on the main stable decomposition components of SF 6 (namely SO 2 F 2 and SOF 2 ) of the commonly metal materials uesd in GIS, such as aluminum (Al), copper (Cu) and stainless steel (SS). Firstly, an experimental platform is constructed to simulate SF 6 decomposition under a PD area, and the influence regularities of Al, Cu and SS on the concentration, formation rate and saturation time of SO 2 F 2 and SOF 2 are obtained. Secondly, the influence mechanism of Al, Cu and SS are preliminary explored combined with the chemical activity of the metal materials.

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Development of a suitcase time‐of‐flight mass spectrometer for in situ fault diagnosis of SF₆‐insulated switchgear by detection of decomposition products

Hou

et al. 2016

Rapid Comm Mass Spectrometry

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RATIONALE: Sulfur hexafluoride (SF 6 ) gas-insulated switchgear (GIS) is an essential piece of electrical equipment in a substation, and the concentration of the SF 6 decomposition products are directly relevant to the security and reliability of the substation. The detection of SF 6 decomposition products can be used to diagnosis the condition of the GIS. METHODS: The decomposition products of SO 2 , SO 2 F 2 , and SOF 2 were selected as indicators for the diagnosis. A suitcase time-of-flight mass spectrometer (TOFMS) was designed to perform online GIS failure analysis. An RF VUV lamp was used as the photoelectron ion source; the sampling inlet, ion einzel lens, and vacuum system were well designed to improve the performance. RESULTS: The limit of detection (LOD) of SO 2 and SO 2 F 2 within 200 s was 1 ppm, and the sensitivity was estimated to be at least 10-fold more sensitive than the previous design. The high linearity of SO 2 , SO 2 F 2 in the range of 5-100 ppm has excellent linear correlation coefficient R 2 at 0.9951 and 0.9889, respectively. CONCLUSIONS: The suitcase TOFMS using orthogonal acceleration and reflecting mass analyzer was developed. It has the size of 663 × 496 × 338 mm and a weight of 34 kg including the battery and consumes only 70 W. The suitcase TOFMS was applied to analyze real decomposition products of SF 6 inside a GIS and succeeded in finding out the hidden dangers. The suitcase TOFMS has wide application prospects for establishing an early-warning for the failure of the GIS.

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Analysis of PD-generated SF/sub 6/ decomposition gases adsorbed on carbon nanotubes

Cited by 65 publications

References 22 publications

The SF6 Decomposition Mechanism: Background and Significance

The SF6 Decomposition Mechanism: Background and Significance

Influence Regularity of Aluminum, Copper and Stainless-steel on SF₆ PD Decomposition Characteristics Components

Development of a suitcase time‐of‐flight mass spectrometer for in situ fault diagnosis of SF₆‐insulated switchgear by detection of decomposition products

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Analysis of PD-generated SF/sub 6/ decomposition gases adsorbed on carbon nanotubes

Cited by 65 publications

References 22 publications

The SF6 Decomposition Mechanism: Background and Significance

The SF6 Decomposition Mechanism: Background and Significance

Influence Regularity of Aluminum, Copper and Stainless-steel on SF6 PD Decomposition Characteristics Components

Development of a suitcase time‐of‐flight mass spectrometer for in situ fault diagnosis of SF6‐insulated switchgear by detection of decomposition products

Contact Info

Product

Resources

About

Influence Regularity of Aluminum, Copper and Stainless-steel on SF₆ PD Decomposition Characteristics Components

Development of a suitcase time‐of‐flight mass spectrometer for in situ fault diagnosis of SF₆‐insulated switchgear by detection of decomposition products