The Sulfr hexafluoride Decomposition Mechanism: Background and Significance

Jan 24, 2017 · Comparing all of the detection methods, diagnosing the insulation defect through analyzing the decomposed gases of insulating gas 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 gaz sf6 insulated equipment.Get price

The decomposition products of sulfur hexafluoride (Sulfr hexafluoride

From the environmental and health points of view, it is necessary to mitigate and control the emissions of the decomposition products from SF 6 destruction processes because most of them (e.g. S 2 F 10, SF 4 and HF) are highly reactive, corrosive and toxic, and few of them are also potent GHGs. This article aimed to introduce the fully fluorinated gas in industrial/commercial uses, and its toxic decomposition products in their environmental and health hazards, occupational exposure limitsGet price

The decomposition products of sulfur hexafluoride (Sulfr hexafluoride

Nov 01, 2007 · Although SF 6 has been recognized as a physiological inert gas, its decomposition products while producing and/or abating by electrical discharge (e.g. arc, spark or corona) or other destruction methods have aroused concerns about their toxicities in recent years [5], [6], [7], [8], [9], [10], [11].Get price

Collisional electron detachment and decomposition rates of SF

process involving SF; on Sulfr hexafluoride is predominately dissocia-tive, 17,18 and that charge transfer involving F- on Sulfr hexafluoride may lead to both SF 6- and SF s- (Refs. 6 and 17). III. CALCULATIONS The analysis of rates for chemical processes in drift tubes or electrical discharges requires expressing inelastic-collision probabilities in terms of rateGet price

CN101799458A - Method for analyzing decomposition products of

By using the invention, the decomposition products such as SO2F2 in sf6 gas can be accurately analyzed; and by analyzing the decomposition impurities such as SO2F2, the internal operating condition of...Get price

(PDF) Highly Sensitive and Precise Analysis of Sulfr hexafluoride

Abstract and Figures A ppb-level CO sensor based on multi-comb optical-feedback cavity enhanced absorption spectroscopy with a 2.3 μm diode laser was developed for insulating gas decomposition analysis in...Get price

Handling and Use of Sulfur Hexafluoride Gas

decomposition by-products may also include sulfur-oxyfluorides and hydrofluoric and sulfuric acids. The presence of these by-products can be readily detected by a white or gray powdery substance or a very pungent odor similar to rotten eggs. All in-service SF 6 equipment shall be assumed to contain decomposition by-products.Get price

Analysis of PD-generated insulating gas decomposition gases adsorbed on

A large number of studies indicated that SF 6 decomposes under PD through a series of chemical reactions where the low fluorinated sulfur species react with the trace H 2 O and O 2 in the gas...Get price

Fourier transform infrared spectroscopy quantitative analysis

Feb 05, 2015 · Schematic of SF 6 decomposition. The hydrolysis products of SF 6 decomposition components, such as HF, H 2 SO 3, and SO 2, have a corrosive effect on GIS internal insulation. Owing to this effect, the speed of insulation degradation increases, and the level of PD intensifies; thus, equipment faults occur.Get price

Ultraviolet differential optical absorption spectrometry

F, SOF 2, SO 2 F 2 of SF 6 decomposition in power equipment Yuwei Fu, Mingzhe Rong, Kang Yang et al.-Chemical kinetic modeling and experimental study of SF 6 decomposition byproducts in 50 Hz ac point-plane corona discharges Qingqing Gao, Chunping Niu, Xiaohua Wang et al.-Recent citations Measurement of CS2 Absorption Cross-Sections in the 188Get price

Decomposition of sf 6 in an RF Plasma Environment

Decomposition of SF 6 A sensitivity analysis of an earlier model showed that the applied power was the most important parameter and positively affects the decomposition fraction of re-actants in an RF plasma reactor.13 Figure 2 shows that when no oxygen was added to the reactor (feed O 2 /SF 6 ratio = 0.0), η gaz sf6 clearly increased from 37.79 to 95.68%Get price

Byproducts of Sulfur Hexafluoride (sf 6) Use in the Electric

Sulfur hexafluoride (SF 6) is a relatively nontoxic gas used in a number of applications for its inert qualities. The dielectric and other physical and chemical properties related to its lack of reactivity have led to the extensive use of SF 6 as an insulating medium in switching equipment (e.g., circuit breakers) by electric utilities. While SF 6Get price

(PDF) The Sulfr hexafluoride Decomposition Mechanism: Background and

The result shows that: Sulfr hexafluoride begins to decompose obviously at 300°C and the main decomposition components contain CO2, SO2F2, SOF2, SOF4, SO2 and H2S; the improvement of fault temperature willGet price

Adsorption of sf 6 decomposition gases (H2S, SO2, SOF2 and

Abstract. By detecting the decomposition gases of sulfur hexafluoride (SF 6 ), the type of internal fault of gas insulated switchgear (GIS) can be determined. In this paper, the scandium atom doped molybdenum sulfide material (Sc-MoS 2) was proposed, and the adsorption behaviors of four typical SF 6 decomposing gases (H 2 S, SO 2, SOF 2, SO 2 F 2) on the surfaces of intrinsic MoS 2 and Sc-MoS 2 are studied based on density functional theory (DFT) method.Get price

THERMAL DECOMPOSITION OF insulating gas AND sf6 gas-AIR MIXTURES IN

Jan 01, 2013 · Mixtures of Sulfr hexafluoride and air after passage through a lighted cigarette tip were analyzed for SF5 decomposition products. The sf 6 concentration in the mixture ranged from 0.1% to 6.5%. The gaseous mixture in a 60 L mixing tank was drawn through the tip of the cigarette by a pump into a Tediar gas sampling bag.Get price

Decomposition Characteristics of gaz sf6 and Partial Discharge

Experimental results show that the negative DC partial discharges caused by the four defects decompose the Sulfr hexafluoridegas and generate five stable decomposed components, namely, CF4, CO2, SO2F2, SOF2, and SO2. The concentration, effective formation rate, and concentration ratio of insulating gasdecomposed components can be associated with the PD types.Get price

sf6 gas Decomposition in Gas-Insulated Equipment - IEEE Journals

Abstract: The increasing application of gaz sf6 as an insulating gas has led to many studies on Sulfr hexafluoride decomposition in gas-insulated equipment. In the presence-of an electric arc, spark or corona, Sulfr hexafluoride decomposes to a wide variety of chemically active products which possess completely different properties from sf 6.Get price

Sulfr hexafluoride Worries – The Most Potent and Persistent Greenhouse Gas

Sep 20, 2019 · It has been identified as disulfur decafluoride, S 2 F 10, a gaseous molecule with a sulfur-sulfur bond and each sulfur atom octahedrally surrounded by five fluorine atoms. It likely forms via an electrically induced decomposition reaction of SF 6: 2 SF 6(g) → S 2 F 10(g) + F 2(g) S 2 F 10 has a toxicity four times that of phosgene, COCl 2!Get price

Sensors | Free Full-Text | Gas Sensing Analysis of Ag

Detection of decomposition products of sulfur hexafluoride (insulating gas) is one of the best ways to diagnose early latent insulation faults in gas-insulated equipment, and the occurrence of sudden accidents can be avoided effectively by finding early latent faults. Recently, functionalized graphene, a kind of gas sensing material, has been reported to show good application prospects in the gas sensorGet price

Decomposition Characteristics of sf 6 under Partial Discharges

The decomposition compound analysis of insulating gas in GIS is an effective method to diagnose the PDs caused by insulation defects. It is significant to clarify the decomposition characteristics of Sulfr hexafluoride...Get price

insulating gas DIAGNOSTICS AND SOLUTIONS — Powertech Labs

Sep 01, 2016 · Sulphur hexafluoride (SF 6) is a non-toxic, odourless gas with unique electrical properties. For over 50 years, it has been used in high-voltage gas-insulated switchgear (GIS), where its excellent dielectric and arc-quenching properties make it an ideal insulating gas for medium- and high-voltage equipment. However, when the gas decomposes, it forms decomposition products that are toxic to maintenance personnel and harmful to equipment.Get price

Production of S2F10 in sparked sf6 gas | Request PDF

The detection, by gas chromatography, of S2F10 in the spark decomposition of sf6 gas is reported. Heating sparked gaz sf6 to 250 degrees C was found to remove S2F10, consistent with its low reported...Get price

CA2504092A1 - Method and device for the detection of sf6

This invention is in the field of gas detection for sulphur hexafluoride (Sulfr hexafluoride) gas decomposition products, particularly for the detection of thionyl fluoride (SOF2) and sulphur dioxide (SO2). The...Get price

Theoretical study of the decomposition mechanism of Sulfr hexafluoride/Cu

Sep 10, 2018 · Tang J et al 2012 Partial discharge recognition through an analysis of sf 6 decomposition products part 1: decomposition characteristics of Sulfr hexafluoride under four different partial discharges IEEE Trans. Dielectr. Electr. Insul. 19 29–36. Crossref Google ScholarGet price

Decomposition Characteristics of sf6 gas under Flashover

In this paper, the flashover discharging experiment was carried out on epoxy resin surface in an insulating gas atmosphere under pin-plate electrodes, with the electrodes distance from 5 mm to 9 mm. The concentration of seven characteristic gases was detected, indicating that the concentration of SOF2 and CF4 was the two highest, followed by SO2, CO2, SO2F2, CS2, and H2S. Based on the changes in theGet price

Ni-CNT Chemical Sensor for insulating gas Decomposition Components

Oct 16, 2018 · However, insulation defects inevitably occur in Sulfr hexafluoride-insulated equipment, which induces Sulfr hexafluorideto decompose into various decomposition components: SO2, H2S, SOF2, and SO2F2under electric discharge [4,5,6,7]. In addition, the existence of insulation defects and sf6 gasdecomposition dramatically reduce the insulation strength of Sulfr hexafluoride-insulated equipment.Get price

COLLISIONAL DECOMPOSITION OF Sulfr hexafluoride- - NIST

Sulfur hexafluoride (SF 6) is widely used as a gaseous dielectric in high-voltage applications due to its extremely large cross section for electron attachment [1,2] and stability with respect to decomposition in subsequent collisions with insulating gas [3]. It is also recognized as a greenhouse gas [4] and it has been suggested that a mixture of SF 6andGet price

Comparative Study of Materials to Sulfr hexafluoride Decomposition

Feb 07, 2017 · In order to judge the inside insulation fault of gaz sf6 insulated equipment, the gas-sensing properties to a series of characteristic gaz sf6 decomposition components, SOF2, SO2F2, SO2, H2S, CF4, HF, and Sulfr hexafluoride, have been studied. In this study, a comparative study of these gas-sensing materials has been made in theoretical and experimental fields to find the optimal gas-sensing material, and putGet price

Development of a suitcase time‐of‐flight mass spectrometer

Aug 18, 2016 · High linearity to SO 2, SO 2 F 2 in the range of 5–100 ppm with excellent linear correlation coefficient R 2 at 0.9951, 0.9889 are obtained (Fig. 4). The linear curve slope values for SO 2, SO 2 F 2 are 22.56 and 16.56, respectively. However, the sensitivity of SO 2 F 2 is lower than SO 2 due to the addition of two electrophilic fluorine atoms.Get price