SF
            <sub>6</sub>
            positive DC partial discharge decomposition components under four typical insulation defects

Cao, Zhengqin; Tang, Ju; Zeng, Fuping; Yao, Qiang; Miao, Yanwei

doi:10.1049/iet-gtd.2018.5101

Cited by 17 publications

(11 citation statements)

References 19 publications

(20 reference statements)

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“…The main chemical reaction formulas are given in Equations (1)- (20). Compared with the SF 6 decomposition behaviours in GIS [20], the proportion of CO 2 exceeds that of SO 2 under the A-type metal protrusion defect, whereas the proportions of the two components under B-type protrusion defect are close to GIS conditions, which is in line with our anticipations.…”

Section: Analysis and Comparison Between The Erip-ctvsb And Gissupporting

confidence: 80%

“…The main chemical reaction formulas are given in Equations ()–(). Compared with the SF 6 decomposition behaviours in GIS [20], the proportion of CO 2 exceeds that of SO 2 under the A‐type metal protrusion defect, whereas the proportions of the two components under B‐type protrusion defect are close to GIS conditions, which is in line with our anticipations. For metal particles defect, the PD under GIS conditions produces almost no CO 2 , whereas the proportion of CO 2 under bushing conditions reaches 14.06%, even more than SO 2 F 2 .…”

Section: Experimental Methods and Resultsmentioning

confidence: 99%

“…This is due to the fact that the formation of SO 2 F 2 depends mainly on the following two chemical reactions: the reaction of low-fluorine sulfides with O 2 , and the reaction of SOF 4 with H 2 O [21,22], as shown in Equations ( 12) and ( 13), respectively. Among them, SOF 4 is mainly obtained from the reaction of SF 5 with hydroxide or oxygen atoms and the reaction of SF 4 with hydroxide and sulphur atoms, as shown in Equations ( 18) to (20), respectively. The measurement results (considering the SOF 4 is not suitable as a key characteristic decomposition component, herein we do not present the concentration of SOF 4 ) show that the proportion of SOF 4 is also smaller under the defect of contamination on the ERIP than under the defect of contamination on the insulator, which has been identified as a typical insulation defect in GIS.…”

Section: Analysis and Comparison Between The Erip-ctvsb And Gismentioning

confidence: 99%

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SF₆ decomposition behaviour under partial discharge of typical insulation defects in gas‐solid insulated valve‐side bushing of converter transformer

et al. 2023

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In this paper we investigated SF6 decomposition behaviour of typical insulation defects in gas‐solid insulated converter transformer valve‐side bushing under partial discharge (PD). Additionally, we compared the results with that of gas insulated switchgear (GIS). The results indicated that SF6 decomposition behaviour varies with the insulation defects type. For metal protrusion defects, the proportion ranking of CO2 and SO2 can be related to whether the needle tip is wrapped with epoxy resin‐impregnated paper (ERIP). The proportion of carbon‐containing products is much higher under contamination defect than under other defects. Moreover, the proportion of carbon‐containing components is higher under flashover condition than under PD condition and is accompanied by the appearance of H2S and CS2. However, the yield of SO2F2 is always low. Compared to negative DC voltages, positive DC voltages have a higher proportion of carbon‐containing components, mainly in the form of more CO2 and less SOF2. Compared to the PD decomposition behaviour of typical insulation defects in GIS, when PD involves ERIP, the proportion of carbon‐containing products, especially CO2, is significant higher, while the proportion of sulphur containing products, especially SO2F2, is lower.

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Section: Analysis and Comparison Between The Erip-ctvsb And Gissupporting

confidence: 80%

Section: Experimental Methods and Resultsmentioning

confidence: 99%

Section: Analysis and Comparison Between The Erip-ctvsb And Gismentioning

confidence: 99%

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SF₆ decomposition behaviour under partial discharge of typical insulation defects in gas‐solid insulated valve‐side bushing of converter transformer

et al. 2023

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“…Besides, since the generation rate of decomposed components was associated with the severity of discharge [91], it can assess the severity of the defect. For statistical representation, the effective generation rate was considered [10]. Another study also reported using the enhanced concentration ratio (SO2F2)/(SOF2) by using the effective characteristic ratio to identify the PD energy statistically [29].…”

Section: Decomposed Component Analysis Based Pd Severity Evaluationmentioning

confidence: 99%

SF₆Decomposed Component Analysis for Partial Discharge Diagnosis in GIS: A Review

2022

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This paper compiles, summarizes, and deliberates over one hundred important works on the different approaches and advances in the surveillance and diagnosis of the internal status of SF6 gas-insulated equipment (GIE), particularly partial discharge (PD) diagnosis in gas-insulated switchgear (GIS), and the proposed diagnosis techniques used. This review focused on four research aspects on PD diagnosis related to the developments in PD detection techniques, PD sources identification, and PD severity evaluation. Besides, the effect of various factors such as gas pressure, applied voltage, and impurities on the deterioration of insulation gas and its influence on the diagnosis process has been reviewed. Currently, some reviews on PD diagnosis in SF6-insulated switchgear have been presented and analysed; however, to date, most of them tend to focus on various PD detection techniques in GIS, while others are not extensive and comprehensive reviews. Unlike the available review publications, this paper highlighted various aspects of PD diagnosis in GIS and created a base for further development. The research trend in this field is expected to be directed toward a comprehensive assessment. This review provided a position of the current PD diagnosis in GIS studies and developments that can be a guideline for researchers for further research on the topic's actual impact in the field.

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“…SF 6 has been widely used as insulation medium for the operation safety of gas-insulated equipment due to its insulation and excellent arc extinguishing characteristics. − However, in long-running gas-insulated equipment, SF 6 would decompose in partial discharge to F atoms and other low fluorinated sulfur species, which further react with trace H 2 O, trace O 2 , and organic solid insulation material to generate HF, COF 2 , CS 2 , SO 2 , SOF 2 , SO 2 F 2 , S 2 F 10 , etc. − It has been proved that detecting SF 6 characteristic decomposed products by chemical sensors is a feasible and effective method to online monitoring and insulation defect diagnosis of gas-insulated equipment. − …”

Section: Introductionmentioning

confidence: 99%

First-Principles Calculations for Adsorption of HF, COF₂, and CS₂ on Pt-Doped Single-Walled Carbon Nanotubes

Cao

Gang

et al. 2021

ACS Omega

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HF, CS2, and COF2 are three important decomposition components of the SF6 gas insulation medium. In this paper, the gas sensitivity of Pt doped on (8, 0) single-walled carbon nanotube (SWCNT) to HF, CS2, and COF2 is investigated based on density functional theory. The binding energy, charge transfer, density of states, and frontier molecular orbital theory are discussed. It is found that all processes of HF, CS2, and COF2 adsorbed on Pt-SWCNT are exothermic. Pt-SWCNT donated 0.182 electrons to CS2 molecules during the interaction process but acts as an electron acceptor during adsorption of HF and COF2 on it. After comprehensive consideration of binding energy and charge transfer, the response of Pt- SWCNT to CS2 may be the best, and those to HF and COF2 are almost the same. In addition, after the adsorption of the three kinds of gases on Pt-SWCNT, the order of the conductivity of the Pt-SWCNT material is CS2 > COF2 ≈ HF via frontier molecular orbital theory analysis. The Pt-SWCNT material is probably more suitable as a gas sensor for the detection of CS2 in the application of gas-insulated equipment.

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SF ₆ positive DC partial discharge decomposition components under four typical insulation defects

Cited by 17 publications

References 19 publications

SF₆ decomposition behaviour under partial discharge of typical insulation defects in gas‐solid insulated valve‐side bushing of converter transformer

SF₆ decomposition behaviour under partial discharge of typical insulation defects in gas‐solid insulated valve‐side bushing of converter transformer

SF₆Decomposed Component Analysis for Partial Discharge Diagnosis in GIS: A Review

First-Principles Calculations for Adsorption of HF, COF₂, and CS₂ on Pt-Doped Single-Walled Carbon Nanotubes

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SF 6 positive DC partial discharge decomposition components under four typical insulation defects

Cited by 17 publications

References 19 publications

SF6 decomposition behaviour under partial discharge of typical insulation defects in gas‐solid insulated valve‐side bushing of converter transformer

SF6 decomposition behaviour under partial discharge of typical insulation defects in gas‐solid insulated valve‐side bushing of converter transformer

SF6Decomposed Component Analysis for Partial Discharge Diagnosis in GIS: A Review

First-Principles Calculations for Adsorption of HF, COF2, and CS2 on Pt-Doped Single-Walled Carbon Nanotubes

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Product

Resources

About

SF ₆ positive DC partial discharge decomposition components under four typical insulation defects

SF₆ decomposition behaviour under partial discharge of typical insulation defects in gas‐solid insulated valve‐side bushing of converter transformer

SF₆ decomposition behaviour under partial discharge of typical insulation defects in gas‐solid insulated valve‐side bushing of converter transformer

SF₆Decomposed Component Analysis for Partial Discharge Diagnosis in GIS: A Review

First-Principles Calculations for Adsorption of HF, COF₂, and CS₂ on Pt-Doped Single-Walled Carbon Nanotubes