Abstract: An insulating gas for an electric device which comprises pentafluoropropionitrile or a mixture of pentafluoropropionitrile and sulfur hexafluoride and at least one nitrite ester selected from methyl nitrite, ethyl nitrite, propyl nitrite, butyl nitrite, and amyl nitrite. The effects of pentafluoropropionitrile on humans can be moderated by addition of the nitrite ester.

Abstract: A current transformer characterized by a terminal bushing extending from a tank with a pair of spaced conductors extending through the bushing and into the tank and with the portions of the conductors in the tank being enclosed within tubular means. The assembly of the conductors, bushing, and tubular means being clamped together by resilient (spring) means for holding the conductors in tension and the bushing and tubular means in compression. The transformer also embodies two separate oil systems.

Abstract: A novel electrical insulating oil and oil-filled electrical appliances that are impregnated with the novel insulating oil. The electrical insulating oil is quite suitable for use in oil-filled electrical appliances in which insulating materials or dielectric materials made of plastics are employed. The electrical insulating oil comprises (a) at least one member of alkylbiphenyls and alkylnaphthalenes and (b) at least one member of monoolefins and diolefins each having two condensed or noncondensed aromatic nuclei.

Abstract: A low cost resinous insulating solution is made by blending a polyester resin with a solution of a reaction product admixture containing long chain alkyl phenol, short chain alkyl phenol, crosslinking agent, aldehyde and alkali catalyst.

Abstract: An improved electrical insulating oil and oil-filled electrical appliances impregnated therewith. The electrical insulating oil is quite suitable for use in oil-filled electrical appliances in which insulating materials or dielectric materials made of plastics are employed. The electrical insulating oil comprises (a) at least one member of diarylalkanes and (b) at least one member selected from the group of mono- and/or diolefins having two condensed or noncondensed aromatic nuclei.

Abstract: A flameproof electrical insulating fluid and an electrical cable impregnated with such fluid, the insulating fluid being a mixture of a polymethylsiloxane having a viscosity greater than 5 centistokes at 25.degree. C. and an aromatic compound corresponding to the chemical formula: ##STR1## where R is an aliphatic radical and said aromatic compound is present in the mixture in an amount from 0.5% to 10% by weight of the total weight of the mixture. Preferably, the aromatic compound is isopropyldiphenyl.

Abstract: Transformer, including an iron core, high voltage and low voltage windings, at least one cast resin body completely embedding, holding and insulating the windings, the cast resin body having cooling channels formed therein and having additional channels formed therein being separated from the cooling channels, and insulating gas filling the additional channels.

Abstract: There is disclosed a fluid comprising a mixture of about 5 percent to about 40 percent by volume of a halogenated benzene and about 60 percent to about 95 percent by volume of an alkyl branched chain phthalate ester, said fluid having a dielectric constant greater than the dielectric constant of either of the halogenated benzene or the alkyl branched chain phthalate ester. The dielectric constant of an alkyl branched chain phthalate ester having a dielectric constant above about 4.0 is increased by mixing a halogenated benzene having a dielectric constant above about 4.0 with the alkyl branched chain phthalate ester whereby the measured dielectric constant of the alkyl branched chain phthalate ester having the halogenated benzene therein, is at least 0.25 higher than the dielectric constant of either the halogenated benzene or the alkyl branched chain phthalate ester. The preferred halogenated benzene is trichlorobenzene, and the preferred alkyl branched chain phthalate ester is di-2-ethylhexylphthalate.

Abstract: A gas/vapor electromagnetic induction machine comprises an annular coil container including two coaxial electrically insulating cylinders connected at lower ends to an annular bottom plate and coaxially disposed around an iron core within an enclosed tank charged with a non-condensable electrically insulating gas and a condensable cooling gas. A dripping pan receives a condensate of the cooling gas located on the lower portion of the tank through the operation of a pump and drops the condensate into the annular coil container and onto the iron core assembly located within the annular coil container. Thus a coil is always partially or entirely immersed in the condensate collected in the annular coil container.

Abstract: An ignition coil for use with internal combustion engines includes a casing made of iron materials and a coil cap made of an insulating material and secured to the opening end of the casing to close the same. The casing contains a central core, a secondary coil disposed about the outer periphery of the central core, and a primary coil disposed around the outer periphery of the secondary coil. The coil cap mounts thereon primary and secondary terminals, and is integrally formed with a cylindrical leg portion shaped to extend toward the inner bottom surface of the casing and enclose the secondary coil inward. The cylindrical leg portion of the coil cap is integrally formed at its outer periphery with upper and lower flanges, and the primary coil is wound round the outer periphery of the cylindrical leg portion between the upper and lower flanges.

Abstract: An insulating system is described that incorporates a cellulosic material which is impregnated with a nitrogen content no less than 0.2% by weight and a overall density not greater than 0.9 gm/cm.sup.3. This cellulosic material when impregnated by a dielectric liquid such as transformer oil, exhibits a more uniform electrical stress distribution than papers having a density greater than 0.9 gm/cm.sup.3. The insulating system thereformed is particularly useful for application in low stress areas such as the layer insulation in a distribution class transformer.

Abstract: A device for chocking an inverted type current transformer when transported on its side.It comprises at least one jack (12) within the metal enclosure (1) but operable from outside the latter and disposed, during transportation of the transformer on its side, between the transport platform (36) and the magnetic core (8) of the current transformer to eliminate any cantilever loading.

Abstract: Disclosed is an apparatus which is resistant to electrical breakdown consisting of a chamber containing electrodes separated by dielectric gas supersaturated with the vapor from a dielectric liquid.

Abstract: A particular silicone dielectric fluid, having aliphatic hydrocarbon or substituted aliphatic hydrocarbon substituents, with a specific gravity of at least 1.02, is employed to encapsulate and insulate an electrical cable splice. The same particular silicone dielectric fluid, with a specific gravity of at least 1.02 is also used to fill an electrical cable's conductor interstices.

Abstract: Electrical inductive apparatus having a tank, an insulating and cooling liquid in the tank and an electrical winding structure immersed in the liquid, the liquid having a low vapor pressure and containing contaminants derived from various sources within the tank. Filter means associated with the liquid including a liquid recirculating device for degassing, demoisturizing, and filtering insoluble particles out of the liquid, whereby the liquid is decontaminated and upgraded in a continual process.

Abstract: The anti-inflammability of dimethyl silicone oil for use in static electric apparatuses is improved by reacting the dimethyl silicone oil with a cerium chelate compound so as to bind thereto a predetermined amount of the cerium chelate compound. This binding suppresses the generation of the cyclic oligomer components to be produced by the decomposition of dimethyl silicone oil, thereby elevating the flash point of the dimethyl silicone oil.

Abstract: A particular dielectric fluid, having a composition with a specific gravity of at least 1.02 and consisting essentially of a silicone fluid and an additive, soluble in said silicone fluid, selected from the group consisting of trimethylsilyl treated (CH.sub.3).sub.3 SiO.sub.1/2 /SiO.sub.2 resin copolymer, dipropyleneglycoldibenzoate, dixylylethane, phenylxylylethane, and a mixture of [(CH.sub.3).sub.3 Si].sub.2 O treated silica and a silica aerogel, is employed to encapsulate and insulate an electrical cable splice. The same particular dielectric field composition is also used to fill an electrical cable's conductor interstices.

Abstract: Disclosed is a method of inhibiting the attack by perchloroethylene on copper and organic polymers subject to said attack, such as parylene, by adding to perchloroethylene about 20 to about 1000 ppm of a stabilizer having the general formula ##STR1## The preferred concentration of the stabilizer is about 40 to about 500 ppm. Also disclosed is an electrical apparatus containing copper or organic polymer subject to attack by perchloroethylene and perchloroethylene containing the stabilizer.

Abstract: Compositions containing ditolyl ethers have outstanding dielectric properties. They are particularly suitable for use as impregnating agents in condensers.

Abstract: The electric device according to the present invention has as its constituents the insulating materials and elements comprising films of synthetic resin, for instance, polypropylene, impregnated with 1-phenyl-2-ethylphenylethane and/or 1-phenyl-2-isopropylphenylethane.According to the present invention, insulating oils having favorable compatibility with the film of synthetic resin such as polypropylene and favorable affinity to metals and having low viscosity have been provided, and in addition, electric devices excellent in properties of withstanding a high voltage and dielectric properties in a broad range of temperature from a low temperature to a high temperature have also been offered.

Abstract: Electrical devices such as transformers and power capacitors are improved by the use of a dielectric fluid prepared by combining perchloroethylene having a low chlorinated ethane content with an antioxidant. This fluid has excellent resistance to decomposition over long periods of time and under severe operational conditions.

Abstract: A flame retardant dielectric coolant for power transformers used in restricted environments consisting of a mixture of an electronegative gas dissolved in silicone fluid for providing improved 60 hertz breakdown voltage resistance to the fluid.

Abstract: A transformer is disclosed which comprises a tank comprising a laminated magnetic core and a winding immersed in a fluid which comprises bright stock catalytically hydrogenated to an aromaticity of 5 to 30 percent. This fluid provides inexpensive insulation for transformers without the need for additives to obtain acceptable physical and electrical properties.

Abstract: An inductive transformer-type storage device comprising a primary winding and a secondary winding arranged inside the primary winding coaxially thereof. The secondary winding has a substantially greater number of turns than the primary winding and is enclosed in a hermetically sealed casing filled with dielectric having an electric strength of at least 50 kV/cm. The hermetically sealed casing also encloses the gap between the windings, which gap is selected so as to ensure the break-down strength in the dielectric, as well as an interwinding coupling factor of 0.2 to 0.8. The inductive storage device is intended for supplying power to installations generating powerful relativistic electron beams.

Abstract: Electrical inductive apparatus including an electrically insulated electrical winding, an insulating dielectric surrounding the winding, and an insulating member associated with the winding which projects into the insulating dielectric. The insulating member includes a solid adhesive binder, and a filler of microspheres. The binder and microspheres are selected such that the dielectric constant of the insulating member is less than about 3.5 times the dielectric constant of the insulating dielectric.

Abstract: Electrical apparatus containing a novel synthetic oil as an insulating fluid which is prepared by reacting an aromatic compound with the oligomers of four to 12 carbon alpha-olefins containing predominantly at least about 30 carbon atoms up to about 60 carbon atoms. For example, an electrical power transformer is provided containing a synthetic insulating oil prepared by reacting benzene in a 1:1 molar ratio with a tetramer-pentamer mixture obtained by the oligomerization of 1-decene.

Abstract: Electrical inductive apparatus cooled by a two-phase dielectric fluid which vaporizes within the normal operating temperature range of the apparatus. The electrical inductive apparatus consists of a sealed enclosure surrounding a magnetic core and electrical winding assembly. A non-condensable gas fills a major portion of the enclosure at no-load conditions to provide adequate dielectric strength around the apparatus and is substantially removed to a storage tank when the apparatus reaches normal operating conditions. The required volume of the storage reservoir is proportional to the free volume of the enclosure and the volume of liquid dielectric disposed therein. The bottom surface of the enclosure includes a recessed channel portion configured to closely surround the lower yoke of the magnetic core and which serves to reduce the amount of liquid dielectric utilized and the free volume of the enclosure thereby minimizing the required volume of the storage reservoir for the non-condensable gas.

Abstract: A power transformer having an operating temperature in excess of 200.degree. C. and including a casing or tank, an electrical core and coil assembly having an asbestos based barrier material and being supported in said casing, and a low cost saturated hydrocarbon insulating fluid substantially filling the casing and having a vapor pressure at 200.degree. C. less than 10 millimeters of mercury and a flash point in excess of 230.degree. C.

Abstract: Fluid-filled electrical apparatus suitable for use in harsh environments. The electrical apparatus includes a tank having bottom and side members whose configuration provides corrosion protection for the electrical apparatus. A plurality of radially spaced, annular shoulders in the bottom member, with flanges therebetween, define a configuration wherein the innermost circular-shaped portion of the bottom member fits with the cylindrical side member with the lower edge of the side member disposed in proximity to one of the flanges in the bottom member to form a joint suitable for welding. The outwardmost flange of the bottom member extends downward from the joint and beyond the side member to provide an edge or rim upon which the entire tank rests and, further, presents sacrificial metal to the environment which protects the joint despite corrosion of the outermost flange.

Abstract: In an electrical device containing a dielectric fluid, the improvement comprising employing as the dielectric fluid a compound of the formula: ##STR1## where X is independently --Cl or --Br; Z is independently ##STR2## R and R' are independently (CH.sub.2).sub.n CH.sub.3 ; and n is an integer of 0 to 10.

Abstract: Silicone compositions having improved spray flammability resistance comprising a major amount of poly(dimethylsiloxane) fluid and a minor amount of a poly(diorganosiloxane) polymer; a process for improving the spray flammability resistance of poly(dimethylsiloxane) fluids; and improved electrical devices the improvement comprising employing as the liquid dielectric composition of such devices said silicone compositions.

Abstract: Liquid dielectric compositions useful as electrical insulators are comprised of a mixture of a mixed phthalate of isobutyl alcohol and a branched higher alkanol of a diisobutyl phthalate and/or a phthalate of a branched higher alkanol, and wherein the alkyl groups of the constituents contain from 5 to 18 carbon atoms.

Abstract: An ignition coil wherein the high tension terminal carried in a bore in the cap of the coil is movable relative to the cap. The terminal acts as a valve member in the bore and is movable between a position wherein the bore is closed and a position wherein the bore is open. The bore can be used as the means whereby oil is introduced into the casing of the coil if the coil is to be oil filled.

Abstract: Liquid, non-flammable dielectric compositions especially adapted as insulators/coolants for transformers are comprised of [1] a polychlorobenzene and [2] an alkylaromatic hydrocarbon.

Abstract: Dielectric compositions comprising benzyl esters of .alpha.-branched chain alkyl-substituted saturated monocarboxylic acids having improved thermal and chemical stability for extended periods of operation under varying conditions are provided.

Abstract: Electrical devices such as transformers and capacitors containing divinyltetramethyldisiloxane or methylvinylcyclosiloxanes as dielectric fluids are disclosed.

Abstract: Electrical devices such as transformers and capacitors containing certain silacyclopentenes as dielectric fluids are disclosed.

Abstract: Electrical apparatus having certain portions thereof insulated with solid insulating structures. The solid insulating structures include a predetermined thickness of polyethylene terephthalate film which is surrounded on each of its major outer surfaces by a layer of paper having a fibrous web formed of wholly aromatic polyamide fibers.

Abstract: The arrangement includes an enclosed container containing therein high voltage electrical components. A dielectric oil is disposed in and completely fills the container. A volume/pressure compensator is fastened to the bottom inner surface of the enclosed container with the compensator including a confined compressible dielectric material compatible with the dielectric oil chemically, thermally and structurally.

Abstract: A thin wall, stainless steel transformer case of rectangular box configuration is comprised of edge welded steel plates with its sidewalls and end walls bearing vertical, U-shaped bonded channel members of copper for mechanical reinforcement of the case and for forming transformer heat dissipating fins. Stainless steel reinforcing channel members are similarly bonded to the outside of the case bottom wall and the cover. An epoxy fiberglass strap spanning interiorly between the sidewalls of the case at its upper end and bolted to opposed brackets press the transformer core against the bottom wall of the transformer case. A pair of deformable tubes sealably project through the cover for effecting vacuum evacuation of the interior with the cover sealed to the case and for feeding insulating dielectric liquid to the transformer case interior. The tubes are pinched off and sealed after filling.

Abstract: The unique, relatively nonflammable, environmentally safe, insulating oil comprises a saturated hydrocarbon oil having a molecular weight of about 500 to about 700, and a fire point above 200.degree. C. The electrical equipment comprises an oil-sealed tank, a unique insulating oil filling said tank, and an electrical component such as a conductive coil immersed in said insulating oil. A method of filling the oil-sealed tank of an electrical apparatus with the unique insulating oil also is disclosed.

Abstract: An electrical coil comprised of sheet conductor is wound with dry film insulation between turns. The entire structure is maintained in a compressed gas environment, rendering harmless any small voids that may exist in the insulation. Cooling ducts of thin, cylindrical annuli are wound into the coil at intervals, and are completely sealed except for two places where they connect with inlet and outlet pipes.

Abstract: Liquid dielectric compositions useful as electrical insulators are comprised of [1] a liquid dielectric component of known type, in combination with [2] at least one member selected from the group consisting of monocyanophenoxybenzene, monocyanodiphenyl and monocyanoterphenyl.

Abstract: The transformer oils of improved resistivity are prepared by adding an effective quantity of a carbonyl containing compound particularly an aldehyde or ketone to a conventional transformer oil.

Abstract: An oil-immersed type flyback transformer device wherein the container for the flyback transformer is made of plastic, whereby the ratio between the temperature coefficient of expansion of the capacity of the container with respect to the original capacity and the composite temperature coefficient of expansion of the volume of the whole assembly housed in the sealed container including the insulating oil is with respect to the original volume maintained within a predetermined range.

Abstract: A stationary electric device such as, for example, a capacitor and a transformer, using linear phenylmethylsilicone oil as an impregnating oil is provided. The use of linear phenylmethylsilicone oil improves an anti-corona property as well as permits the miniaturization of the device.

Abstract: A metal welding gasket secured between a cover and a container to prevent expulsion of weld material into the interior of the device being welded.

Abstract: An insulating oil for use in electrical devices, comprising a mixture of trixylenylphosphate and 10% to 40% by volume of insulating oil having a viscosity of 5 cp to 15 cp at 30.degree.C and selected from the group consisting of mineral oil, alkylbenzene, alkylnaphthalene, diallylalkane, 2-diphenylmethylether, 2-diphenyl-isopropylether, paraffin hydrocarbon oil and naphthene hydrocarbon oil.

Abstract: The transformer, in particular a potential transformer, comprises a generally planar bushing insulator, dimensioned for a liquid or gaseous insulating medium and coaxially enclosing a high-voltage connector, and a flange section enclosing the bushing insulator. The bushing insulator is also enclosed by an intermediate flange filled with a liquid or gaseous insulating medium. One end of the intermediate flange is connected to the instrument transformer and the other end of the intermediate flange is connected to a self-contained high-voltage bushing. A high-voltage connector of the transformer is connected to a conductor of the high-voltage bushing in the space enclosed by the intermediate flange.

Abstract: Improved electrical devices such as transformers, and capacitors containing an improved dielectric fluid consisting essentially of a major amount of a liquid polyorganosiloxane and a minor amount of certain selected chlorendates which are soluble in said siloxane are disclosed.