92results about "Organic gases insulators" patented technology

Azeotropic or azeotrope-like compositions are disclosed. The azeotropic or azeotrope-like compositions are mixtures of E-1,1,1,4,4,5,5,5-Octafluoro-2-pentene with methyl formate, n-pentane, 2-methylbutane, 1,1,1,3,3-pentafluorobutane, trans-1,2-dichloroethylene, 1,1,1,3,3-pentafluoropropane, dimethoxymethane, cyclopentane or Z-1,1,1,4,4,4-hexafluoro-2-butene. Also disclosed is a process of preparing a thermoplastic or thermoset foam by using such azeotropic or azeotrope-like compositions as blowing agents. Also disclosed is a process of producing refrigeration by using such azeotropic or azeotrope-like compositions. Also disclosed is a process of using such azeotropic or azeotrope-like compositions as solvents. Also disclosed is a process of producing an aerosol product by using such azeotropic or azeotrope-like compositions as propellants. Also disclosed is a process of using such azeotropic or azeotrope-like compositions as heat transfer media. Also disclosed is a process of extinguishing or suppressing a fire by using such azeotropic or azeotrope-like compositions. Also disclosed is a process of using such azeotropic or azeotrope-like compositions as dielectrics. Also disclosed is a process for the separation of a chemical compound from a mixture of two or more chemical compounds using such azeotropic or azeotrope-like compositions.

Disclosed is a mixture comprising the compound trans-1,1,1,4,4,4-hexafluoro-2-butene and at least one additional compound selected from the group consisting of HFOs, HFCs, HFEs, CFCs, CO2, olefins, organic acids, alcohols, hydrocarbons, ethers, aldehydes, ketones, and others such as methyl formate, formic acid, trans-1,2 dichloroethylene, carbon dioxide, cis-HFO-1234ze+HFO-1225yez; mixtures of these plus water; mixtures of these plus CO2; mixtures of these trans 1,2-dichloroethylene (DCE); mixtures of these plus methyl formate; mixtures with cis-HFO-1234ze+CO2; mixtures with cis-HFO-1234ze+HFO-1225yez+CO2; and mixtures with cis-HFO-1234ze+HFC-245fa. Also disclosed are methods of using and products of using the above compositions as blowing agents, solvents, heat transfer compositions, aerosol propellant compositions, fire extinguishing and suppressant compositions.

The invention relates to a broadband radial pattern leaky coaxial cable used for subway and a manufacturing method thereof, and the leaky coaxial cable has the double functions of transmission line of information and duplexer. The structure of the leaky coaxial cable consists of an inner conductor, an insulation layer, an outer conductor and a jacket, wherein, the inner conductor is externally covered with the insulation layer which is externally covered with the outer conductor that is externally sheathed with the jacket, and the insulation layer that covers on the surface of the inner conductor adopts nitrogen or carbon dioxide physical foam to form a foamed polyethylene insulation layer; cambered slotted holes are opened on a clutch gold belt of the outer conductor covered outside the insulation layer. The manufacturing method comprises the steps: (1) a spiral wrinkle inner conductor is manufactured by longitudinal covering welding and embossing by using a copper strip; (2) the nitrogen or the carbon dioxide are adopted to be injected into the smelted polyvinyl plastics, and then the physical foamed polyethylene insulation layer is formed on the surface of the inner conductor by extrusion and cladding; (3) the slotted holes broken out by the clutch gold belt of the outer conductor are the cambered slotted holes; (4) the clutch gold belt of the outer conductor is covered on the insulation layer longitudinally, and the surface of the clutch gold belt of the outer conductor is crowded and covered with the jacket.

Azeotropic or azeotrope-like compositions are disclosed. The azeotropic or azeotrope-like compositions are mixtures of (A) a compound of the formula CF₃CX═CHR_a where X is H or F and R_a is CF₃CF₂, CF₃ or Cl, provided that (i) when X is F, R_a is Cl, (ii) when R_a is CF₃CF₂ or Cl, the compound of formula CF₃CX═CHR_a is the E configurational isomer, and (iii) when R_a is CF₃, the compound of formula CF₃CX═CHR_a is the Z configurational isomer; and (B) a compound of the formula CF₃R_b where R_b is CHFCH₂F or CH═CHCF₃, provided that when R_b is CH═CHCF₃, X is F and the compound of formula CF₃R_b is the Z configurational isomer. Also disclosed are processes for using such azeotropic or azeotrope-like compositions for preparing a thermoplastic or thermoset foam, for producing refrigeration, for producing an aerosol product and for extinguishing and suppressing a fire; and as blowing agents, solvents, heat transfer media and dielectrics.

A gas insulated switchgear is provided which uses an SF₆ substitute gas as an insulating gas and thus causes reduced environmental load while achieving high dielectric strength and excellent interrupting performance.

The gas insulated switchgear includes a switchgear housed in a container filled with an insulating gas. The insulating gas contains CF₃I and CO₂ with CF₃I present at a pressure ratio of 15% or more

Provided is a thin flexible flat cable which can exhibit an excellent flexibility and bending resistance without degrading excellent electric characteristic based on a strip structure and improve thecost performance. The flexible flat cable (1) includes: an air-containing layer which has a width substantially identical to a transmission path width of a cable body (10) having a plurality of conductors (11) arranged at a predetermined pitch and which serves as an insulating member arranged to sandwich the cable body (10) from both sides; and a shield member (23, 24) which covers the surface ofthe air-containing layer and is electrically connected to a ground layer at terminal portions at both ends of the cable body (10). The air-containing layer is formed by nonwoven fabric pieces (14, 15)cut with a width substantially identical to the transmission path width of the cable body (10).

The invention provides a modified formula of an environment-friendly gas insulating medium. The modified formula is characterized by comprising an environment-friendly dielectric, a buffer gas and oxygen, wherein the environment-friendly dielectric accounts for 4% to 10% by volume, the buffer gas accounts for 80% to 94% by volume, and the oxygen accounts for 2%to 10% by volume. The environment-friendly dielectric is any one of C4F7N, C5F10O, and C6F12O. The buffer gas is either N2 or CO2. A mixed gas configured according to the modified formula of the environmentally-friendly gas insulating medium of the invention, when used in an electrical device, such as a gas-insulated combined device, using an insulating gas as an insulating medium, has a higher dielectric strength than a unmodified environmentally-friendly dielectric mixed gas. Moreover, the modified environment-friendly dielectric mixed gas can reduce the precipitation of carbon particles and enhance the insulation reliability of the environment-friendly dielectric mixed gas.

An electrical device containing a dielectric fluid, the dielectric fluid comprising heptafluoroisobutyronitrile or 2,3,3,3-tetrafluoro-2-(trifluoromethoxy) propanenitrile.

The present invention provides medium- or high-voltage equipment including a leaktight enclosure in which there are located electrical components and a gas mixture for providing electrical insulation and/or for extinguishing electric arcs that are likely to occur in said enclosure, the gas mixture comprising heptafluoroisobutyronitrile, carbon dioxide, and oxygen in small quantities. Electrical components covered in a solid dielectric layer of varying thickness are located inside said leaktight enclosure of the equipment of the invention.

A dielectric insulation medium. The insulation medium is characterized in that it comprises a fluoroketone having from 4 to 12 carbon atoms.

A gas insulated switchgear includes a high-voltage conductor installed inside a ground tank filled with an insulation gas and the high-voltage conductor is supported on an insulation spacer and thereby fixed to the ground tank. The gas insulator switchgear is configured in such a manner that an insulation portion of the insulation spacer in contact with the insulation gas is covered with a cover film formed by hardening powder of any of thermoplastic resin, glass, cellulose, and polymer resin made of carbon and hydrogen having a particle size of 100 μm or less with epoxy resin.

A dielectric insulation medium including a fluoroketone containing 5 carbon atoms, in a mixture with a dielectric insulation gas component different from the fluoroketone, in particular air or an air component, the dielectric insulation medium, in particular the dielectric insulation gas, having a non-linearly increased dielectric strength that is larger than a sum of dielectric strengths of the gas components of the dielectric insulation medium.

Azeotrope-like compositions are disclosed. The azeotrope-like compositions are mixtures of E-1-chloro-2,3,3,3-tetrafluoropropene with E-1,1,1,4,4,4-hexafluoro-2-butene or E-1,1,1,4,4,5,5,5-octafluoro-2-pentene. Also disclosed is a process of preparing a thermoplastic or thermoset foam by using such azeotrope-like compositions as blowing agents. Also disclosed is a process of producing refrigeration by using such azeotrope-like compositions. Also disclosed is a process of using such azeotrope-like compositions as solvents. Also disclosed is a process of producing an aerosol product by using such azeotrope-like compositions. Also disclosed is a process of using such azeotrope-like compositions as heat transfer media. Also disclosed is a process of extinguishing or suppressing a fire by using such azeotrope-like compositions. Also disclosed is a process of using such azeotrope-like compositions as dielectrics.

A method of manufacturing a porous ultraviolet curable resin coated wire includes (a) preparing an ultraviolet curable resin composition not including a hydrous water absorbent polymer, (b) preparing a hydrous water absorbent polymer-dispersed ultraviolet curable resin composition having a water content of 40% or more by preparing a water-swollen hydrous water absorbent polymer including a water absorbent polymer and water, and then dispersing the hydrous water absorbent polymer into the ultraviolet curable resin composition, (c) forming a two-layer structure on a metal wire by coating the metal wire with the ultraviolet curable resin composition not including the hydrous water absorbent polymer and the hydrous water absorbent polymer, and (d) performing a dehydration on the two-layer structure.

Azeotropic or azeotrope-like compositions are disclosed. The azeotropic or azeotrope-like compositions are mixtures of E-1,3,4,4,4-pentafluoro-3-trifluoromethyl-1-butene and Z-1,1,1,4,4,4-hexafluoro-2-butene. Also disclosed is a process of preparing a thermoplastic or thermoset foam by using such azeotropic or azeotrope-like compositions as blowing agents. Also disclosed is a process of producing refrigeration by using such azeotropic or azeotrope-like compositions. Also disclosed is a process of using such azeotropic or azeotrope-like compositions as solvents. Also disclosed is a process of producing an aerosol product by using such azeotropic or azeotrope-like compositions. Also disclosed is a process of using such azeotropic or azeotrope-like compositions as heat transfer media. Also disclosed is a process of extinguishing or suppressing a fire by using such azeotropic or azeotrope-like compositions. Also disclosed is a process of using such azeotropic or azeotrope-like compositions as dielectrics.

Azeotrope-like compositions are disclosed. The azeotrope-like compositions are mixtures of Z-1,1,1,4,4,4-hexafluoro-2-butene and E-1,1,1,4,4,4-hexafluoro-2-butene. Also disclosed is a process of preparing a thermoplastic or thermoset foam by using such azeotrope-like compositions as blowing agents. Also disclosed is a process of producing refrigeration by using such azeotrope-like compositions. Also disclosed is a process of using such azeotrope-like compositions as solvents. Also disclosed is a process of producing an aerosol product by using such azeotrope-like compositions. Also disclosed is a process of using such azeotrope-like compositions as heat transfer media. Also disclosed is a process of extinguishing or suppressing a fire by using such azeotrope-like compositions. Also disclosed is a process of using such azeotrope-like compositions as dielectrics. Also disclosed is a foam-forming composition containing such azeotrope-like composition and an active hydrogen-containing compound having two or more active hydrogens.

The invention relates to the use of a gas as a medium for electrically isolating and/or extinguishing electric arcs, said gas comprising a hexafluorobutene. The invention also relates to an electric device comprising a sealed chamber inside which electric components and said gas are located.

A service device for a multi-component insulating gas for use during maintenance of electrical switchgear systems comprising a compressor with a downstream condenser, a storage container, the service device is connected to a system space, and the compressor compresses the insulating gas during removal from the system space, all components of the insulating gas remain in the compressor in a gaseous state, the condenser is controlled by a controller so a condensation of the insulating gas occurs first in the storage container, a storage heating device is provided for the storage container, during filling of the system space the storage heating device heats the insulating gas to a temperature above the critical temperature of the insulating gas, wherein, a line heating device is provided which at least partially heats the pipeline between the storage container and the system space and/or heats elements in the pipeline.