The Decomposition Pathways of SF6 in the Presence of Organic Insulator Vapors

Fu, Yuwei; Wang, Xiaohua; Wang, Xinxin; Yang, Aijun; Rong, Mingzhe

doi:10.1007/s11090-019-10055-0

Cited by 9 publications

(2 citation statements)

References 39 publications

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“…The results of existing research show that, under the partial strong electromagnetic energy instantly released by the spark discharge, SF 6 molecules will be divided into low-fluorine sulphides SF x (x = 1, 2, …, 5) [45,46]. SF x easily reacts with trace H 2 O and other impurities in the gas chamber, thereby resulting in a series of complex and irreversible chemical reactions, which generate decomposition characteristic products, such as SOF 2 , SOF 4 , SO 2 F 2 , SO 2 , S 2 F 10 , S 2 OF 10 , HF, and CO 2 .…”

Section: Decomposition Characteristics Of Sf 6 Under Spark Dischargementioning

confidence: 99%

SF ₆ decomposition and insulation condition monitoring of GIE: A review

Zeng

Cheng

et al. 2021

High Voltage

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The statistics of the Conference International des Grands Reseaux Electriques (CIGRE) indicate that the operational reliability of SF 6 gas-insulated equipment (GIE) is very high; however, the failure rate of the GIE in operation is much higher than that of the IEC standard, and the fault occurs frequently in the GIE at a high voltage level. The reason is due to the complex and strong on-site electromagnetic interference environment and fully enclosed structure of GIE. The key method and technology for effective on-line monitoring and fault diagnosis of GIE are still lacking. Given the partial strong electromagnetic energy and high temperature induced by early latent insulation faults in the equipment, SF 6 gas insulation presents different degrees of decomposition. The decomposition products mainly include SO 2 F 2 , SOF 2 , SO 2 , HF, and H 2 S. The decomposition characteristics of SF 6 are closely related to the property of insulation faults. At present, this area is attracting attention from the power industry and research institutes. This study summarises the current research on SF 6 decomposition component analysis (DCA). The content mainly includes the latest progress of SF 6 decomposition characteristics and mechanism under fault conditions, and fault diagnosis methods based on decomposition components.

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Section: Decomposition Characteristics Of Sf 6 Under Spark Dischargementioning

confidence: 99%

SF ₆ decomposition and insulation condition monitoring of GIE: A review

Zeng

Cheng

et al. 2021

High Voltage

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show abstract

“…These defects can further distort the electric field and cause serious failures, which may lead to discharge or overheat. As a result, the gas insulating medium in the equipment might be split into small fragments that will generate several decomposition products [18][19][20]. The new environmental insulation gas such as Novec 4710, Novec 5110, and other fluorinated alkene are more easily to be decomposed than SF 6 .…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of the decomposition mechanism of a novel eco-friendly insulation medium HFO-1336mzz(E) considering the effect of trace humidity

Liu¹,

Wang²,

Zhong³

et al. 2021

J. Phys. D: Appl. Phys.

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As a strong greenhouse gas, sulfur hexafluoride used in electrical equipment has been advocated to be replaced. HFO-1336mzz(E), an eco-friendly insulation alternative medium with excellent insulation performance and environmental effect, deserves studied deeply. In this paper, the decomposition mechanism of HFO-1336mzz(E) is studied by density functional theory calculations. The effect of trace water on the decomposition properties is also considered and studied. Besides, multiple linear regression models are used to assess the insulation properties of main decomposition products that came from HFO-1336mzz(E). The results show that more than 15 molecules are formed in the decomposition process of HFO-1336mzz(E), among which CF 3 CH=C=CF 2 , CF 2 =CF-CH=CF 2 , C 2 F 6 , and HF are the most abundant products. Besides, C 2 F 4 , CF 2 =CFH, and C 2 H 2 could be taken as typical products for diagnosing the serve fault degree that occurred in the electrical equipment. In terms of insulation properties, CF 3 CH=C=CF 2 and CF 2 =CF-CH=CF 2 , two of the main products, with big volumes have excellent insulation strength that is slightly less than that of HFO-1336mzz(E). Small molecules with low dielectric strength such as CF 3 H, CF 3 OH, COF 2 , and HF, etc can also be produced in the presence of micro humidity. Luckily, the yield of these small molecules is small so that they will not have a significant impact on the insulation properties of the overall system. Remarkably, the presence of micro humidity will make it easier to generate toxic gas products such as COF 2 and HF. Given these conditions, the acceptable moisture content in the power equipment is expected to propose before any application in the electrical industry. Relative studies on the decomposition mechanism of HFO-1336mzz(E)/H 2 O in this paper may be helpful to understand the subsequent scientific experimental research.

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Study on the mechanism of the effect of temperature on the decomposition reaction of SFn (n = 1–6) under discharge conditions

Yang

Yan

et al. 2021

J Mol Model

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The study on the mechanism of the effect of temperature on the decomposition reaction of SFn (n=1-6) under discharge conditions is very important in studying the potential fault of SF6 high voltage switch equipment and perfecting the chemical kinetic model of SFn discharge. In this paper, structural optimizations, vibrational frequency calculations, and zero-point energy calculations for the reactants and products were performed at the B3LYP/6-311++G(d,p) theory level. The single-point energies of all species were collected at the CCSD(T)/aug-cc-PVTZ level. The electric and thermal decomposition mechanism of SFn under discharge conditions of 298K-10000K were studied, respectively. The conclusion drawn was that in the temperature range of 298-10000K, the thermal decomposition homopolytic reaction △G began to decline from 200 kJ/mol, while the △G of the other two heterogenous reactions began to decrease from 1000 kJ/mol and 2000 kJ/mol, showing a downward trend of an almost similar slope. The electrolysis of SFn is related to the electron energy. When the electron energy is low, SFn + e→SFnseries reactions occur, and △G of R12, R20, R28, R36, R44 increases with temperature rise, while △G of R4 decreases with temperature. When the electron energy is high, one of SFn -→SFn−1 -+ F、 SFn -→SFn−1 + Fand SFn -→SFn−1 + F + e will occur, and the reactions that occur at various temperature ranges as the temperature rises vary. When the second electron hits the SFn -, the SFn -+ e→SFn−1 -+ F reaction will occur. The △G of this reaction slowly decreases with an increase in temperature. This study in clearer terms explains the decomposition process and mechanism of SFn at different temperatures.

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The Decomposition Pathways of SF6 in the Presence of Organic Insulator Vapors

Cited by 9 publications

References 39 publications

SF ₆ decomposition and insulation condition monitoring of GIE: A review

SF ₆ decomposition and insulation condition monitoring of GIE: A review

Theoretical study of the decomposition mechanism of a novel eco-friendly insulation medium HFO-1336mzz(E) considering the effect of trace humidity

Study on the mechanism of the effect of temperature on the decomposition reaction of SFn (n = 1–6) under discharge conditions

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The Decomposition Pathways of SF6 in the Presence of Organic Insulator Vapors

Cited by 9 publications

References 39 publications

SF 6 decomposition and insulation condition monitoring of GIE: A review

SF 6 decomposition and insulation condition monitoring of GIE: A review

Theoretical study of the decomposition mechanism of a novel eco-friendly insulation medium HFO-1336mzz(E) considering the effect of trace humidity

Study on the mechanism of the effect of temperature on the decomposition reaction of SFn (n = 1–6) under discharge conditions

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SF ₆ decomposition and insulation condition monitoring of GIE: A review

SF ₆ decomposition and insulation condition monitoring of GIE: A review