Study of Heating Device for Sulfur Hexafluoride Gasification

2020 ◽  
Vol 18 (2) ◽  
pp. 157-163
Author(s):  
Hong Yu ◽  
Maoyong Cao ◽  
Tanbo Zhu ◽  
Fanming Liu
Keyword(s):  
Sulfur Hexafluoride ◽  
Steel Cylinder ◽  
Liquid Sulfur ◽  
Heating Device ◽  
Gas Insulated Switchgear ◽  
Temperature And Humidity ◽  
Speed Up ◽  
Specific Temperature

Sulfur hexafluoride (SF6) gas has been used to gas-insulated switchgear (GIS) because of its insulation properties and extinguishing characteristics. The processing of liquid sulfur hexafluoride from cylinders into GIS is endothermic. The processing gas inflation always leads to decrease SF6 gas inflation speed due to the lack of heat supplement and the infiltrated moisture will stick on the GIS equipment, especially at the valve outlet. In the paper, a heater detection device for sulfur hexafluoride (SF6) steel cylinder is developed. The new heater device will monitor and display the specific temperature and humidity of the valve outlet instantaneously and then heat and dry the sulfur hexafluoride (SF6) steel cylinder with automatic and stability. Then it helps to speed up the sulfur hexafluoride gasification. Meanwhile, the whole device is portable in safety.

Raman Studies of Molecular Reorientation in Liquid Sulfur Hexafluoride

1974 ◽  
Vol 52 (13) ◽  
pp. 1209-1214 ◽  
Author(s):  
S. Sunder ◽  
R. E. D. McClung
Keyword(s):  
Sulfur Hexafluoride ◽  
Fourier Transforms ◽  
Raman Band ◽  
Rotational Diffusion ◽  
Diffusion Limit ◽  
Molecular Reorientation ◽  
Rotation Tensor ◽  
Liquid Sulfur ◽  
Correlation Times ◽  
Tensor Formula

The contour of the v2 Raman band of SF6 liquid has been studied over the temperature range 226–315 K. Reorientational and angular momentum correlation times were obtained by comparing the Fourier transforms of the band contours with the reorientational correlation functions calculated using the J diffusion limit of the extended rotational diffusion model. A reanalysis of Hackleman and Hubbard's nuclear relaxation data for liquid SF6, using the correlation times obtained from the Raman studies, yields the value ± 6.2 × 104 s−1 for the asymmetry in the spin–rotation tensor [Formula: see text] for fluorine nuclei in SF6.

Differences of SF6 Byproducts in Simulated Electric Equipment of Overheating Faults in Different Condition

2012 ◽  
Vol 512-515 ◽  
pp. 1121-1124 ◽  
Author(s):  
Yu Wang
Keyword(s):  
Sulfur Dioxide ◽  
Hydrofluoric Acid ◽  
Sulfur Hexafluoride ◽  
High Humidity ◽  
Temperature And Humidity ◽  
Electric Equipment ◽  
Low Humidity ◽  
Safety Operation

The decomposition of sulfur hexafluoride (SF6) in overheated electric equipment at different temperature and humidity was simulated in the study. SF6 is significantly decomposed at 350°C. SF6 is more easily decomposed in high humidity than in low humidity. The concentrations of SF6 byproducts, such as sulfur dioxide (SO2), sulfureted hydrogen (H2S) and hydrofluoric acid (HF), in high humidity are much higher than those in low humidity. Moisture in electric equipment accelerates the decomposition of SF6. In order to insure the safety operation of electric equipment, moisture in the equipment should be strictly controlled. SF6 will be decomposed to format HF. The concentration of HF will decrease when its concentration increases up to a certain concentration. It may be because that HF was strongly corrosive and its corrosion to inner equipment made the concentration of HF decreasing.

scholarly journals Impact analysis of humidity and temperature on the value of thermal conductivity λ coefficient of insulating materials used inside buildings

2013 ◽  
Vol 12 (4) ◽  
pp. 165-176
Author(s):  
Maciej Trochonowicz ◽  
Beata Witek ◽  
Marcin Chwiej
Keyword(s):  
Thermal Conductivity ◽  
Laboratory Tests ◽  
Impact Analysis ◽  
Insulating Materials ◽  
Coefficient Of Thermal Conductivity ◽  
Temperature And Humidity ◽  
Specific Temperature ◽  
Materials Used ◽  
Thermal Conductivity Λ ◽  
Cellular Concrete

The aim of the article is to present the issues related to the use of climate panels as insulating materials used inside buildings. The study involved four materials, the two of them is a lightweight cellular concrete, the other two were produced on the basis of lime silicate. The main aim of the laboratory tests was to determine the coefficient of thermal conductivity λ depending on the changing temperature and humidity. Based on research the sorption materials curves were determined. The study allows you to specify the amount of moisture that can be accepted by the material in specific temperature and humidity conditions. In addition, the examined coefficients of thermal conductivity compared with the values declared by suppliers to assess compliance with the data contained in the data sheet.

Distribusi Medan Listrik di Kompartemen Busbar Gas Insulated Switchgear (GIS) Menggunakan Charge Simulation Method

2020 ◽  
Vol 1 (2) ◽  
pp. 47-52
Author(s):  
Saepul Rahmat ◽  
Riyani Prima Dewi
Keyword(s):  
Sulfur Hexafluoride ◽  
Simulation Method ◽  
Charge Simulation Method ◽  
Gas Insulated Switchgear ◽  
Gas Insulated Substation

Penelitian ini bertujuan untuk mengilustrasikan distribusi medan listrik di kompartemen busbar tipe gas insulated switchgear (GIS). Gas Insulated Substation (GIS) merupakan rangkaian peralatan gardu induk yang terpasang di dalam sebuah metal enclosure dan diisolasi oleh gas bertekanan yaitu Sulfur Hexafluoride (SF6). Dalam simulasi ini, diasumsikan titik referensi berada di sekitar contact pin busbar, dan titik muatan buatan berada disekitar kompartemen busbar. Simulasi dilakukan dengan menentukan titik referensi dan titik muatan bantuan untuk menghitung nilai muatan yang akan dicari yaitu contact pin. Titik muatan buatan ini terletak disembarang titik disekitar kompartemen busbar GIS dan akan dihitung nilai muatannya melalui metode simulasi muatan (charge simulation method)  dengan bantuan komputasi Matlab

scholarly journals Replacing SF6 in Electrical Gas-Insulated Switchgear: Technological Alternatives and Potential Life Cycle Greenhouse Gas Savings in an EU-28 Perspective

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1807
Author(s):  
Pieter Billen ◽  
Ben Maes ◽  
Macarena Larrain ◽  
Johan Braet
Keyword(s):  
Greenhouse Gas ◽  
Carbon Footprint ◽  
Sulfur Hexafluoride ◽  
Cost Effective ◽  
Intergovernmental Panel ◽  
Medium Voltage ◽  
Gas Insulated Switchgear ◽  
Important Exception ◽  
Environmentally Sound ◽  
The Eu

To date, atmospheric concentrations of sulfur hexafluoride (SF6) are the most potent among the greenhouse gases identified by the Intergovernmental Panel on Climate Change (IPCC) and are still rising. In the EU-28, SF6 has been banned from several applications, however, an important exception is gas-insulated electrical switchgear (GIS) for which cost-effective and environmentally sound alternatives were unavailable when the F-Gas regulation was last revised in 2014. To date, after some recent innovations, we argue that the phasing out of SF6 could spur the accelerated development of alternatives with a lower carbon footprint. In the EU-28, the SF6 amount in switchgear is unclear. In this paper, we estimated the SF6 amount to be between 10,800 and 24,700 t (with a mode at 12,700 t) in 2017, resulting in 68 to 140 t of annual emissions from operational leakage only, corresponding to 1.6 to 3.3 Mt of CO2-eq. We additionally calculated the potential greenhouse gas savings over the lifecycle of one exemplary 145 kV gas-insulated switchgear bay upon replacing SF6 by decafluoro-2-methylbutan-3-one (C5-FK) and heptafluoro-2-methylpropanenitrile (C4-FN) mixtures. Projecting these results over the EU-28, a phase-out scenario starting from 2020 onwards could reduce the carbon footprint by a median of 14 Mt of CO2-eq, over a period of 50 years. Extrapolation to medium voltage could be assumed to be of a similar magnitude.

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