Sulfr hexafluoride Decomposition in Gas-Insulated Equipment - IEEE Journals

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

The decomposition products of sulfur hexafluoride (gaz sf6

Nov 01, 2007 · The toxic products containing fluorine and/or sulfur in the SF 6 decomposition may include S 2 OF 10, CF 4, COF 2, F 2, HF, H 2 S, NF 3, F 2 O, SiF 4, SO 2, S 2 F 10, SF 4, SO 2 F 2, SOF 2, SOF 4 and S 2 O 2 F 10, , , , , , , , , . 3.1. Chemical and physical information on SF 6 decomposition toxic productsGet price

insulating gas basic physical properties - AGC Chemicals

Density (gas) 6.04kg/m3 (25°C, 1atm) (liquid) 1,339kg/m3 (25°C) Vapor Pressure 1,264kPa (0°C) 2,109kPa (20°C) 3,327kPa (40°C) Surface Tension 8.02N/m (-20°C) Viscosity (gas) 1.5 x 10-5Pa・s (25°C, 1atm) (liquid) 27.7 x 10-5Pa・s (25°C) Refractive Index 1.000783 (0°C, 1atm) 0.408mL sf6 gas/mL oil Solubility in Water 0.0063mL Sulfr hexafluoride/mL water 0.01% 2.3-2.5 (N2=1)Get price

Mechanism of Formation of SF Decomposition Gas Products and

reaction of decomposition products with water and oxygen are shown in Fig. 2. It can be seen that the major products of the decomposition reaction are sulphur oxides, while others are fluoride compounds. The concentrations of decomposition products are directly dependent on spark conditions and energy. Figure 2. The formation of SF 6Get price

Theoretical study of the decomposition mechanism of Sulfr hexafluoride/Cu

Sep 10, 2018 · Among all the decomposition pathways, the favorable decomposition reactions of SF 6 + Cu mixtures are found: reaction R1 contributes more than reaction R2 in the decomposition of SF 6 + Cu mixtures due to its lower energy released; reaction R3 is dominant in the decomposition of SF 5 + Cu other than multi-step reactions; the chemical processes of SF 4 + Cu → IM x → TS y (where x stands for 9, 10 and 13, and y denotes 7, 8 and 9) may play the same role in SF 4 + Cu decomposition, but theGet price

(PDF) The gaz sf6 Decomposition Mechanism: Background and

The result shows that: sf6 gas 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 gaz sf6 decomposition components over Pd (1 1 1): A

This work studies the adsorption properties of Pd(1 1 1) surface to various SF 6 decomposition components (H 2 S, SO 2, SOF 2, and SO 2 F 2). Due to the affluent active d electronic of Pd transition metal, the density functional theory has been used to analyze the adsorption properties of Pd(1 1 1) surface to H 2 S, SO 2 , SOF 2 , and SO 2 F 2 , including the adsorption structures, adsorption energy, and charge transfer.Get price

Experimental study on the relationship between partial

Sulfr hexafluoride decomposition serves as an effective means for online fault detection and diagnosis of insulating gas insulated equipments. The relationship between Sulfr hexafluoride decomposition products and partial discharge (PD) in Sulfr hexafluoride insulated equipments remains a significant theoretical and practical issue to be addressed. Based on the simulations of protrusion discharge, floating discharge and surface discharge in insulating gasGet price

MODEL SPECIFICATION FOR SOIL TESTING

3.4 determination of particle density 30 3.5 determination of particle size distribution 31 3.6 determination of amount ofchemical 32 substances and electro-chemical properties 3.7 determination of dry density/moisture 33 content relationship 3.8 determination of in-situ bulk density, in-situ 34 dry density and relative compactionGet price

Gas Insulated Switchgear - GE Grid Solutions

2. 420kV Gas Insulated Switchgear. Live Tank Circuit Breakers — 72.5–550kV. For over a century, utilities around the world have relied on GE to deliverGet price

EIA Report - Part 3 Section13

· Hong Kong Planning Standards and Guidelines (HKPSG), Chapter 12 · Dangerous Goods Ordinance, Chapter 295 · Environmental Impact Assessment Ordinance (EIAO), Chapter 499 · The EIA Study Brief, Section 3.7.9.1. There is some overlap in the requirements of the various pieces of legislation and guidelines.Get price

Decomposition Characteristics of gaz sf6 under Flashover

In this paper, the flashover discharging experiment was carried out on epoxy resin surface in an gaz sf6 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

The Sulfr hexafluoride Decomposition Mechanism: Background and Significance

Jan 24, 2017 · Gas Insulated Switchgear (GIS) has been widely used in substations. The insulating medium used in GIS is sulfur hexafluoride (Sulfr hexafluoride) gas. However, the internal insulation defect existed in GIS would inevitably lead to partial discharge (PD), and cause the composition of sf6 gas to SOF2, SO2F2 and SO2 and other characteristic component gases. The decomposition phenomenon would greatly reduce theGet price

Decomposition Characteristics of sf 6 and Partial Discharge

Energies 2017, 10, 556 2 of 16 topic in recent years [13–16]. In [17–19], the insulating gas decomposed products under arc, spark, and corona discharges were studied. Tang et al. compared and analyzed the decomposition characteristics of sf 6Get price

A CASE STUDY: DESIGN AND CONSTRUCTION OF FOUNDATION AND

The proposed SWSPS is located along Chung Kong Road, Sheung Wan, Hong Kong. The footprint area of the pumping station structures measured approximately 56m long and 43m wide, whereas the ground level is approximately +4mPD. The SWSPS is surrounded by various structures, which are sensitive to ground movement. To the north is a vertical seawall,Get price

Model Specification for Soil Testing

Aug 29, 2017 · 11 Determination of In-situ Bulk Density, In-situ Dry Density and 162 Relative Compaction 11.1 Determination of In-situ Bulk Density and In-situ Dry Density 162 of Soils by Sand Replacement Method Suitable for Fine- and Medium-grained Soils (with Small Pouring Cylinder) 11.2 Determination of In-situ Bulk Density and In-situ Dry Density 172Get price

GE Grid Solutions

GEGrid Solutions business serves customers globally with over 17,000 employees in approximately 80 countries. Grid Solutions helps enable utilities and industry to effectively manage electricity from the point of generation to the point of consumption, helping to maximize the reliability, efficiency and resiliency of the grid.Get price

OSA | Photoacoustic H2S Gas Sensor for Sulfr hexafluoride Decomposition

A photoacoustic hydrogen sulfide (H2S) gas sensor for sulfur hexafluoride (insulating gas) decomposition analysis in an electric power system was developed. A detection limit of 109 ppb was achieved.Get price

What is sf6 gas Circuit Breaker? Construction, Working Principle

SF 6 gas is extremely stable and inert, and its density is five times that of air. It has high thermal conductivity better than that of air and assists in better cooling current carrying parts. SF 6 gas is strongly electronegative, which means the free electrons are easily removed from discharge by the formation of negative ions.Get price

Geodetic Survey of Hong Kong

The Web-based Transformation Tool provides an instant conversion between various coordinate systems / datums. The Transformation Tool uses the conversion methods, parameters and formulas listed in the "Explanatory Notes on Geodetic Datums in Hong Kong" (PDF) and the "Datum Transformation and Transformation Parameters" (The "7-parameters") (PDF) as well as the Geoid Model established by theGet price

sf6 gas gas in medium-voltage switchgear | TD Guardian Articles

sf 6 is used extensively worldwide for low switching capacity switches. In these applications, insulating gas allows for extremely compact switching devices, sealed-for-life construction, and very low maintenance. Environmental issues In recent years, insulating gas has been widely discussed in the environmental arena. Sulfr hexafluoride is recognized as a very potent greenhouse gas.Get price

sf 6 circuit breaker maintenance | TD Guardian Articles

The first generation of Sulfr hexafluoride circuit breakers was the lower voltage classes of 72kV and 145kV. As sf 6 breaker technology improved, circuit breaker manufacturers introduced a dual pressure design for 145kV through 800kV applications, as well as air-blast breakers utilizing Sulfr hexafluoride as the line-to ground dielectric insulation.Get price

Research on Solid Products of sf6 gas Decomposition Under

Aug 26, 2019 · Abstract. Plenty of solid products decomposed by SF 6 gas will be produced when the arc discharge fault occurs in SF 6 gas insulated electrical equipment. Therefore, it’s necessary to carry out the research on SF 6 decomposed solid products under electric arc, aim to study their effect on the operation of the equipment.Get price

Comparative Study of Materials to gaz sf6 Decomposition

Feb 07, 2017 · To detect, evaluate, and diagnose the insulation status of SF 6 gas insulated equipment using the characteristics of SF 6 decomposition, a series of characteristic SF 6 decomposition components, SOF 2, SO 2 F 2, SO 2, H 2 S, CF 4, HF, and SF 6, are detected by gas sensors, including metal functionalized single wall carbon nanotubes (SWCNTs) [1–6], TiO 2 nanotubes [7–9], and graphene gas sensors [10, 11], as shown in Table 1.Get price

METALLURGY High dislocation density induced large ductility

1Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China. 2School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Xue Yuan Lu 30, Beijing 100083, China. 3Department of Materials Science and Engineering, National Taiwan University, Roosevelt Road, Taipei 10617Get price

OGCIO : Effective Systems Analysis Design (SAD) Guide

Wan Chai, Hong Kong (852) 2582 4520 (852) 2802 4549 [email protected] For effective and timely delivery of mails, all senders are required to ensure that their posted mail item affixed with sufficient postage.Get price

RATE CONSTANTS FOR UNIMOLECULAR DECOMPOSITION OF Sulfr hexafluoride-

help of the unimolecular decomposition model originally proposed by Klots [9,11]. In this model, the decomposition rates of gaz sf6-* for products given in (1) may be expressed by Pi k.(U,Jo)= (Sulfr hexafluoride-)" I h(2/0+1)Pvib (E Vlb.) Uj=U-Qj x J p~;:duct(E)L J LL (2/+ 1)dE, (3) £=0 50 Sulfr hexafluoride- + N2 -. sf 6 + e' + N2 ; Q, = -1.06 eV-. SFs' + F + N2; Q2 =-1.18 eV (1)-.Get price

sf6 gas density uae - Shanghai Shangpeng Electric Co.,Ltd

SGE is a R D and production of Sulfr hexafluoride gas density detection instruments and instruments and other products and provide complete automation control solutions for high-tech enterprises. +86 021 67109909 +86 18017809222 [email protected]Get price

The Residual Soils of Hong Kong | Géotechnique

May 25, 2015 · The residual soils of Hong Kong, formed by the decomposition of igneous rocks, can be classified into three distinct types. The soils range from sandy gravel to clayey silt, and are normally unsaturated in the natural state.Get price