Abstract: Provided is an impregnated capacitor wherein at least part of the capacitor element comprises a metallized polypropylene base film impregnated with an insulating impregnating agent comprising a compound having three condensed or non-condensed aromatic rings, the ratio of the amount of the impregnating agent which penetrates between the base film layers to that of said agent which penetrates into the base film per unit thickness (.mu.) being at least 60.

Abstract: A dielectric fluid for a metallized polypropylene film capacitor including about 90% to about 100% by volume glycenyl tri (epoxy acetoxystearate) or glyceryl tri (acetoxystearate), each being an ester with about 90% acetostearic acid.

Abstract: Disclosed is a dielectric fluid which comprises about 5 to about 40 molar percent of a first arene compound having up to seven substituent alkenyl carbon atoms and about 60 to about 95 molar percent of a diluent. The diluent can be mineral oil, a second arene compound having up to seven substituent alkyl carbon atoms which are hydrocarbons, hydrocarbon ethers, or a mixture thereof, or a mixture of a mineral oil and a second arene compound. Also preferably included in the dielectric fluid is about 0.5 to about 5% of a free-radical polymerization inhibitor. A capacitor and a transformer containing the dielectric fluid are also disclosed.

Abstract: An electrical insulating oil which is suitable for use in impregnating electrical appliances such as capacitors, cables and transformers, especially those in which plastic materials are used partially or totally as dielectrics or insulating materials, and electrical appliances that are impregnated with the above electrical insulating oil. The electrical insulating oil of the invention contains at least one monoolefin and/or diolefin having three condensed or non-condensed aromatic rings.

Abstract: An electrical capacitor of a non-impregnated, self-curing type includes a roll or wound body provided with metallic layers. Interspaces between the windings of the roll are filled with a gaseous or vaporous additive substance of a polyatomic hydrocarbon compound which is free of halogens and whose ionization potential is less than the ionization potential of at least a part of decomposition products of dielectric substance of the capacitor. The additive substances makes it possible that in an electric arc of a disruptive breakdown in the dielectric material of the capacitor the charge is taken over by positive ions of the decomposition product and subsequent clusters of breakdowns are substantially prevented. In addition, the additive substances absorb during a breakdown UV photons so that the emission of secondary electrons on the metallic lining is avoided.

Abstract: An improved electrical insulating oil which is stable in refining treatment and good electrical properties are maintained under high temperature conditions, and oil-filled electrical appliances impregnated therewith. The electrical insulating oil comprises 1,1,-diarylalkenes which are represented by the following general formula (I): ##STR1## wherein R.sub.1 to R.sub.4 's are the same or different and each of them is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and m and n are integers from 0 to 3, inclusive.

Abstract: 1-phenyl-1-tetrahydronaphthyl-ethane or an alkyl-substituted derivative thereof is useful as dielectric fluid in capacitors and undersea power cables having low flammability, high aromaticity and high density.

Abstract: A dielectric fluid for a metallized film capacitor consisting essentially of 75 volume % glyceryl triacetate and 25 volume % 3,4-epoxycyclohexylemethyl-3,4-epoxycyclohexane carboxylate. The capacitor body includes metallized polypropylene film forming the electrodes and a separating dielectric.

Abstract: Disclosed herein are an impregnating oil prepared by admixing an isocyanate compound of tolylene diisocyanate and/or 4,4-diisocyanate-3,3-dimethyldiphenyl with an insulating oil of 1-tolyl-2-phenylethane, 1-ethylphenyl-2-phenylethane, 1-isopropylphenyl-2-phenylethane and/or 1,2-ditolylethane and a capacitor comprising two metallized plastic films impregnated with the thus prepared impregnating oil.

Abstract: An oil-filled capacitor which can be made small in size and has excellent electrical characteristics. The capacitor of the present invention is characterized in that it is made by impregnating a film-wound capacitor element with 1-phenyl-1-(benzylphenyl)ethane, at least a part of the dielectric material of said capacitor being made of a plastic film.

Abstract: This invention relates to electric double layer capacitor utilizing electric double layer formed at interface between polarizable electrode and electrolyte, and carbon fibers or activated carbon fibers are used as polarizable electrode (17), and on the polarizable electrodes (17) consisting of the carbon fibers or activated carbon fibers conductive electrodes (18) as collectors are formed to constitute electrode parts.

Abstract: A refined 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 is prepared by refining a mixture of unsaturated dimers of styrenes and alkylbiphenyls and/or alkylnaphthalenes, using a solid acidic substance.

Abstract: Disclosed herein is a capacitor comprising a metallized polypropylene film impregnated with a specified impregnating oil, i.e., a 1,2-bis(alkylphenyl)ethane, the thus prepared capacitor being suitable for use under a high voltage and a high potential gradient.

Abstract: Capacitance loss is reduced in metallized film capacitors by using a cycloaliphatic epoxide as a dielectric impregnant.

Abstract: An ultraviolet curable coating composition particularly adapted for providing water impermeable abrasive resistant coatings on low temperature degradable electronic components comprising a liquid mixture of an acrylated cresol novolac epoxy oligomer, a multifunctional acrylated urethane oligomer, a hydroxyalkyl methacrylate monomer, a bicyclic monofunctional acrylate monomer, a photoinitiator and a calcined cobalt alumina pigment.

Abstract: In a capacitor, a dielectric fluid including 0 to about 10 wt. % of an antioxidant, 0 to about 10 wt. % of an epoxide stabilizer, the remainder essentially a compound with more than two stearate groups. The presently preferred compound of the dielectric fluid is glyceryl tri(acetoxystearate). A primary function of the dielectric fluid is to help prevent air from contacting the capacitor body of the capacitor. The capacitor body includes as its dielectric a plastic film such as polypropylene and the above mentioned dielectric fluid. Air pockets in and around the capacitor body are impregnated with such fluid to minimize disruptive electrical or corona discharges without harmfully swelling the plastic film to thereby improve the operating efficiency of such capacitor.

Abstract: A dielectric fluid for a capacitor includes a mixture of a phthalate ester and an alkylated napthalene.

Abstract: Isopropyl biphenyl is used as a dielectric fluid for a-c electrical capacitors. An additive of an epoxide having the chemical name 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexane carboxylate in an amount of at least 30% by volume of the dielectric fluid increases its dielectric constant.

Abstract: An AC metallized film capacitor having a plurality of electrodes separated by a dielectric spacer contains as its impregnant system an ester dielectric fluid and 2 to 10% of a N,N-substituted carbodiimide to improve capacitance retention characteristics.

Abstract: An AC metallized film capacitor having a plurality of electrodes separated by a dielectric spacer contains a dielectric fluid and 2 to 10% of .alpha.-naphthyl isocyanate as impregnant system to scavenge moisture and to improve capacitance retention.

Abstract: Electrical devices that are impregnated with a dielectric fluid, that is substantially free from water, having a high level of unsaturation and a low viscosity, are disclosed. This dielectric fluid is a reaction product of a siloxane and a silane. The silane has the general formula R.sub.a R'.sub.b Si(OX).sub.4-a-b wherein R is selected from the group consisting of hydrogen, substituted saturated hydrocarbon radicals, and unsubstituted saturated hydrocarbon radicals, R' is selected from the group consisting of substituted and unsubstituted unsaturated hydrocarbon radicals, X is selected from the group consisting of alkyl, alkenyl, alkynyl, aryl and acyl radicals, a has a value of 0 to 3, b has a value of 0 to 3, with a+b having a value of 0 to 3.

Abstract: A dielectric fluid provides a mixture of a diarylethane compound and 10% to 80% by volume of an epoxide additive.

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

Abstract: Polypropylene glycol dielectric fluids are used to impregnate electrical capacitors and particularly metallized capacitors for improved performance.

Abstract: A dielectric fluid for a capacitor includes a mixture of phthalate ester, polychlorinated benzene and a linear alkylbenzene.

Abstract: A high voltage insulator bushing is formed of wound insulating foils and is provided with conductive parts which are at different electric potentials and with a wound insulator body arranged between the conductive parts. The wound insulator body contains layers of an embossed insulating foil which consists of a plastic material which shrinks above a predetermined temperature. The embossed insulating foil is subjected to a thermal shrinking treatment prior to being wound as part of the insulator body. Such preshrinking prevents further shrinkage which would occur when the high voltage bushing is operated. Smooth insulating foil may be wound as part of the insulator body so as to be interposed between the layers of the embossed insulating foil. The gaps and voids which are formed between the layers of insulating foils caused by the irregular surface of the embossed insulating foil are filled with an insulating medium.

Abstract: An electrical apparatus, such as a capacitor, having an improved dielectric system. The capacitor includes alternate layers of metal foil and dielectric material which is impregnated with 1,1-bis(3,4-dimethylphenyl)ethane. The capacitor has improved corona characteristics and low dielectric losses. The liquid dielectric is biodegradable and environmentally acceptable.

Abstract: An improved power capacitor dielectric system utilizes the combination of electrode foils having a raised dimple pattern on their surfaces, and only polypropylene film as the dielectric, the polypropylene film having a texture pattern on one surface.

Abstract: A double metallized paper electrode and polypropylene film dielectric capacitor is preferably impregnated with a blend of a single chemical compound fluid such as phenyl xylyl ethane or mono isopropyl biphenyl and an ester liquid for improved electrical characteristics.

Abstract: An electrical insulating oil and oil-filled electrical appliances, in which the insulating oil comprises a mixture of diarylalkanes and alkyl-3-arylindane derivatives and/or 1,3-diarylbutene derivatives, and has various advantageous properties such as a high dielectric constant, hydrogen gas absorbing capacity, and adaptability to plastic film materials. By impregnating with the above insulating oil, high performance and long life electrical appliances can be manufactured.

Abstract: A modified round roll capacitor has a metallized paper electrode capacitor wound as a roll on a thick walled core tube with the roll and core tube being simultaneously flattened, the flattened core tube serving as an integral rigid core structure for the roll. The core is less deformable than the roll to provide continuing resistance in a flattening process and to maintain tension and central integrity to the structure.

Abstract: Capacitors and similar electrical devices containing a dielectric liquid have superior properties when the dielectric liquid is a polyalkylated diphenyl sulfide. Particularly good dielectric properties are provided when the liquid consists essentially of the mixed isomers obtained by reacting m-xylene or similar dialkylbenzene with SCl.sub.2.

Abstract: Power capacitors with a wide electrode and a narrow electrode and a composite dielectric including a first portion adjacent the narrower electrode that is of higher dielectric constant and/or lower resistivity than the portion adjacent the wider electrode. The first portion may be a porous material whose impregnation with a suitably chosen dielectric fluid results in the desired electrical properties. In such structures the narrower electrode preferably has rounded and smooth edges such as by folding. The wide and narrow electrodes may each comprise one of the externally connected capacitor electrodes. Alternatively, the wider electrode may be electrically floating and arranged between dielectrics and a second narrower electrode in a symmetrical arrangement with the two narrower electrodes serving as the externally connected capacitor electrodes.

Abstract: An electrical capacitor having an improved dielectric system. The capacitor includes layers of metal foil and a dielectric sheet material which is impregnated with a liquid dielectric composition composed of a mixture of methyl diphenyl ethane and a lower alkyl diphenyl.

Abstract: Coiled or stacked capacitors preferably of the self-healing type which exhibit very low variation of capacitance over the service life. A capacitor winding is impregnated with an insulating impregnating material. The capacitor housing is then filled with an impregnating filling material which has a higher dielectric constant than the insulating impregnating material.

Abstract: A dielectric composition comprising a mixture of monoisopropylated diphenyls and polyisopropylated diphenyls, especially a mixture of 30 to 60 parts by weight of monoisopropylated diphenyls and 70 to 40 parts by weight of polyisopropylated diphenyls, the polyisopropylated diphenyls preferably being made up in turn of 60 to 85 parts by weight of diisopropylated diphenyls, 10 to 35 parts by weight of triisopropylated diphenyls and 0.5 to 5 parts by weight of tetraisopropylated diphenyls, these latter amounts being based upon the total amount of the polyisopropylated diphenyls.

Abstract: An electrical capacitor comprising a capacitor element impregnated with a mixture of di-iso-propyl naphthalene and mono-iso-propyl naphthalene, the amount of which latter being 10% to 60% by weight, and preferably 20% to 40% by weight.

Abstract: A capacitor is disclosed of layers of metal foil alternating with insulating sheets impregnated with a dielectric fluid. The dielectric fluid comprises isopropyl biphenyl of which at least about 55% by weight is the meta isomer. The dielectric fluid forms a glassy, amorphous phase at low temperatures rather than a crystalline solid.

Abstract: An impregnated electric wound capacitor has a dielectric consisting of synthetic foils which are wound with paper tapes. The synthetic foils are impregnated with mineral oil and swell such that a residual impregnation gap remains between dielectric and the paper tapes. The existance of such a residual impregnation gap assures that re-impregnation will occur after the capacitor is subjected to temperature changes during operation or after a gas pocket develops due to a partial blow-out.

Abstract: A capacitor is disclosed of alternating layers of plastic film and metal foil impregnated with a dielectric fluid which is an ester of a benzene tri- or tetracarboxylic acid. The esters are preferably trimellitic acid esters, especially tri-isodecyl-trimellitate. The dielectric fluid is sufficiently non-flammable to meet safety requirements and has a relatively high dielectric constant and low power factor.

Abstract: A process for impregnating capacitors with a gas absorbing impregnant is disclosed including the steps of purefying a phthalate ester by adsorptive filtration and adding 5 to 30% by volume of an alkene having from 10 to less than 20 carbon atoms and 0.1 to 10% by volume of an epoxy stabilizer to the phthalate ester prior to impregnating the capacitor.

Abstract: An electrical capacitor using as the insulating oil a mixture of triaryl phosphate, diisopropyl naphthalene and monoisopropyl naphthalene. The phosphate has the structural formula of ##STR1## wherein n=1 to 3; R and R' are alkyl groups, the number of R being 1 and the number of R' being 0 or 1, and the total number of carbon atoms contained in the alkyl group or groups attached to each benzene ring is 1 to 5.

Abstract: The present invention provides novel electric insulating oil compositions and a process for preparing the same. The electric insulating compositions of the invention comprise distillates within a boiling range in terms of normal pressure between 265.degree. C. and 360.degree. C. obtained by processing a hydrocarbon mixture from cracking of petroleum hydrocarbons at a temperature of 700.degree. C. or higher principally composed of components with a boiling range between 75.degree. C. and 198.degree. C., said components mainly containing monocyclic aromatics and comprising aromatic olefins of said boiling range, in liquid phase in the presence of an acid catalyst under such conditions that the reaction temperature is from 0.degree. C. to 200.degree. C., the liquid residence time is from 0.1 hour to 5 hours and the concentration of aromatic olefins in the reaction system is 10% by weight or below.

Abstract: An impregnated electrical capacitor employing a dielectric which at least in part comprises plastic foils, in which the dielectric is expanded by an impregnating agent to substantially eliminate objectionable gaps filled with air or impregnating material whereby the breakdown strength provided by the dielectric foils is not impaired. In producing such capacitor, the temperature during and after impregnation and the degree of winding compression or tightness may be varied to provide desired control of the expansion and insure complete impregnation and control of the final volume, as compared with the original, of the capacitor structure.

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: A capacitor containing a dielectric fluid which is a naphthoxy substituted dimethylsiloxane having a viscosity of less than about 50 centistokes at 25.degree. C. is disclosed.

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 electrical capacitor is impregnated with a base impregnant of a non halogenated aromatic liquid which absorbs gas in the range of 40.degree. to 100.degree. C. to which is added a material that is a greater gas absorber over the same temperature range.

Abstract: A rolled capacitor which includes metal foils interleaved with insulating films and wherein each of the films include metal layer on one side and a roughened surface on the other side.

Abstract: A process for coating electronic elements comprises the steps of (1) forcibly impregnating an element with a liquid thermosetting resin undercoat, (2) depositing a powdered coating material on the element as a topcoat by electrostatic fluidized bed dip coating the element before the undercoat is dry, and (3) curing the resin by heating.