33 results about "Electrical insulation paper" patented technology

An electrical insulation paper that is made of mica flakelets (22), having an average size range of 0.01 to 0.05 mm in their thinnest dimension, hexagonal boron nitride (26), which has an average size range of 10 to 1,000 nm in their longest dimension, and a resin matrix. The mica flakelets and the hexagonal boron nitride are mixed and formed into a paper (17), and the resin is added to the paper after formation, the ratio by weight of the hexagonal boron nitride to the mica flakelets is directly proportional to the average size of the hexagonal boron nitride compared to the average size of the mica flakelets, within an adjustment factor.

The insertion of electrically insulating paper from a continuous roll into slots of a stator created by outwardly projecting teeth is described herein. The insertion of the insulating paper is done by the insertion of prewound coils in the stator slots. The electrically insulating paper is not cut prior to its insertion in the slots, thereby completely covering the outer surface of the stator. The insertion systems and methods described herein are also optionally concerned with the insertion of interphase insulation paper between the different coils inserted in the stator slots and with the insertion of slot closing wedges.

The invention relates to a preparation method of a micro/nano composite fiber electrical insulation paper, and belongs to the technical field of electrical insulation paper. The preparation method comprises the following steps: individually soaking a dry pulp board of softwood pulp and a dry pulp board of other micro fiber pulp in deionized water for 12 hours, after soaking, tearing the pulp boards into pieces with a size of 25 mm*25 mm; then decomposing and beating the processed softwood pulp board and other micro fiber pulp board by a beating machine; carrying out an ultrasonic dispersion treatment, mixing a proper amount of softwood pulp, other micro fibers, and nano fibers, and processing the mixture for 5 to 20 minutes by a stirring device. A mixing beating mode can also be adopted. Namely, preprocessed softwood pulp board and other micro fiber pulp board are directly mixed according to a certain ratio, then the mixture is decomposed and beaten by a beating machine, and the Schopper-Riegler beating degree is controlled in a range of 10 to 60 degrees SR. The process is simple, the operation is easy, and the tensile strength and breakdown field strength of prepared electrical insulation paper are both improved effectively.

The invention discloses a large oil-immersed transformer insulated end ring and a manufacturing technology thereof. The large oil-immersed transformer insulated end ring comprises casein glue layers and a plurality of layers of paperboards, and every two adjacent layers of paperboards are glued via one of the casein glue layer. The manufacturing technology includes: A, utilizing a board shearing machine to shear needed large electrical insulating paperboards into regulated dimension so as to obtain semi-finished paperboards; B, evenly spraying distilled water on the surfaces of the semi-finished paperboards, guaranteeing the paperboards to have certain bending capability, utilizing a roller press to roll the paperboards into cylinders according to technical requirements; and C, selecting casein glue which is strong in permeability on the insulated paperboards to glue the layers of the paperboards according to a single-face gluing technique, tightening the layers of the paperboards via a binding strap, placing in a drying furnace to be subjected to drying and vacuum oil spraying, and finally disassembling the binding strap. The large oil-immersed transformer insulated end ring and the manufacturing technology thereof have the advantages of simple technology, convenience in operation, reliability in performance, and capability of effectively avoiding or greatly reducing of transformer partial discharge magnitude caused by closed air bubbles in insulating parts.

Electrical insulating paper according to an embodiment of the present invention is used while being immersed in electrical insulating oil, and includes a paper base material mainly containing cellulose, an adsorption layer formed on an entire surface of the paper base material by adsorption, and a moisture barrier layer formed by being chemically bonded to the adsorption layer. The moisture barrier layer includes an amphipathic molecule containing both a hydrophobic hydrocarbon group and a hydrophilic functional group in one molecule. The amphipathic molecule is chemically bonded to the adsorption layer via the hydrophilic functional group. The hydrophobic hydrocarbon group covers the surface of the paper base material.

An article comprises an inorganic filler, fully hydrolyzed polyvinyl alcohol fibers, a polymer binder, and high surface area fibers. The article can be formed as an electrically insulating paper for electrical equipment, such as a liquid filled transformer, which can thereby be substantially cellulose free.

Fibrous substrates containing polyetherimides and other synthetic fibers are disclosed, along with methods of preparing electrical insulation paper and articles comprising the fibrous substrates.

A method is provided for producing an electrical insulation paper having a particle composite. The method involves mixing a dispersion of particles in platelet form, a carrier fluid and a functionalizing agent which is distributed in the carrier fluid and has a proportion by mass in the dispersion corresponding to a predetermined mass ratio based on the proportion by mass of the particles. The dispersion is sedimented, such that the particles in platelet form are arranged in essentially plane-parallel layers in the sediment. The carrier fluid is removed from the sediment. Energy is introduced into the sediment to overcome the activation energy of that chemical reaction of the functionalizing agent with the particles which forms the particle composite from the sediment with coupling of the particles via the functionalizing agent. The mass ratio is predetermined such that the particle composite has a porous structure. The insulation paper is thereby produced.

The invention relates to an electrical insulation paper wrinkle tube continuous processing device. The continuous processing device comprises a machine frame, a first baffle, a guide plate, a conveying belt and a driving mechanism are arranged on the machine frame, a first shaft body with a rubber brush and a brazing frame are arranged on the top of the side of the first baffle plate, a first deflection mechanism is arranged on the first shaft body, an upper brazing chain is arranged on one side of the brazing frame, a second deflection mechanism is arranged on a brazing claw of the brazing frame, a second shaft body of a pressing frame and a third shaft body of a pushing frame are provided with a third deflection mechanism and a fourth deflection mechanism respectively, a fifth deflectionmechanism is arranged on a material frame of a second arc-shaped plate, a brazing chain is arranged on one side of the material frame, at least two return brazing chains are arranged between the brazing chain and the upper brazing chain, and a transmission mechanism is arranged on a driving roller of the conveying belt. The continuous processing device is compact in structure, the energy consumption is low, the whole machine is linked, the operation is simple, automatic and rapid continuous brazing, gluing, twisting and forming, brazing circulation and discharging and machining can be realized, so that the equipment, the brazing and the labor cost can be remarkably reduced, the production efficiency and the yield of paper tubes are improved.

The invention discloses a pure polyphenylene sulfide (PPS) fiber high class electrical insulating paper and preparation method of the pure PPS fiber high class electrical insulating paper. PPS superfine fibers are prepared by adopting the method of combining melt spinning and high-temperature high-pressure air flow injection blowing net forming, are cooled by negative pressure cold-air and then agglutinated to form a net, and the fiber net finally forms pure PPS fiber high class electrical insulating paper after being processed in a high-temperature pressurization mode in a certain time. A technological process is short, no pollutant is generated in a productive process, energy consumption is low, prepared insulating paper has good insulativity, is high in temperature resistance grade, and has good fire resistance, chemical properties and mechanical properties.

The present disclosure relates to an aramid paper for a honeycomb, which is prepared by mixing, with an aramid floc, an aramid pulp having a fiber length equal to or longer than a predetermined length and a fibril development equal to or higher than a predetermined level, at a predetermined ratio, a wholly aromatic aramid paper for an electrical insulation paper having superior paper formation property and thus having uniform electrical insulation property, which is prepared by mixing an aramid pulp having a fines content equal to or higher than a predetermined ratio at a predetermined ratio, a laminated aramid paper having a uniform thermal expansion coefficient, uniform electrical conductivity and uniform thermal conductivity, which is prepared by laminating an aramid paper with superior paper formation property on an aramid paper with superior paper strength by calendering, and a method for preparing the same. The aramid paper according to the present disclosure is applicable to a material or a component which requires precision with little difference in physical properties such as a thermal expansion coefficient, electrical conductivity and thermal conductivity. Specifically, it is applicable to a honeycomb, an electrical insulation paper, a PCB substrate, etc. because it has superior paper strength and paper formation property. Moreover, the method for preparing an aramid paper can solve the problems of poor transfer of a base paper, nonuniformity of strength and aggregation between flocs.

The invention relates to a manufacturing method of a damper for preventing ferromagnetic resonance of a capacitor voltage transformer, and belongs to the technical field of voltage transformer production. The damper comprises an iron core, the outer surface of the iron core is coated with an electrical insulation paper layer, the iron core is arranged in a ceramic protection box, and a high-temperature-resistant insulation layer and a high-resistivity wire layer are sequentially arranged outside the ceramic protection box. The damper is compact in structure, small in occupied space and low in production cost.

The main component of the paper-based material is cellulose; the resin layer is made of epoxy resin, the paper-based material contains an amine compound, the paper-based material contains an antioxidant, and the paper-based material contains a carboxylic acid remover. The invention further discloses a liquid-immersed transformer comprising the electrical insulation paper and a preparation method of the electrical insulation paper for a transformer winding. The electrical insulation paper provided by the invention not only has mechanical characteristics, electrical characteristics, good compatibility with insulating oil and impregnation characteristics of traditional electrical insulation paper, but also has better heat resistance. Meanwhile, the transformer has good oxidation resistance and hydrolysis resistance, and is suitable for a large-capacity or small-sized liquid-immersed transformer.