45results about How to "Improve electrical insulation strength" patented technology

The invention discloses a method for preparing a tung oil-modified water-based insulating paint. The method comprises the following steps that: firstly, 100 parts of polyalcohol reacts with 20 to 40 parts of poly-acid and 10 to 20 parts of maleic anhydride at the temperature of between 160 and 200 DEG C for 1 to 2 hours under the protection of the nitrogen gas to give an esterified liquid; secondly, 25 to 35 parts of the tung oil and 50 to 60 parts of maleic anhydride are added into the esterified liquid to react 2 to 6 hours at the temperature of between 190 and 210 DEG C under the protection of the nitrogen gas to form the esterified liquid, 15 to 25 percent of organic solvent by weight is added into the obtained esterified liquid and the mixture is neutralized by organic amine until the pH value is between 7.0 and 8.5 to form a polyester resin liquid modified by the tung oil; and finally, 10 to 30 weight percent of etherified amino resin and 0.1 to 0.3 weight percent of peroxide are added into the tung oil-modified polyester resin liquid and the obtained product is stirred and blended the for half an hour to 1 hour at room temperature to form the tung oil-modified water-based insulating paint. When the insulating paint is used, water is added in the insulating paint, the mixture is stirred and diluted to form a product with a solid content of 30 to 40 weight percent and the pH value of between 7 and 8, and the product is coated on a conductor to be solidified into a paint film at the temperature of between 120 and 130 DEG C.

The invention provides a micro optical DC/AC electric-field sensor for eliminating the drift error of electric charges, capable of being used for measuring the voltage of a high-voltage DC transmission line by an optical method. Two transparent electrodes formed on an electro-optical crystal light-pass end surface used in an optical sensing module are electrically and compactly connected with two output terminals of an optical relay respectively. A secondary light source transmits the light beam that is open and is cut off periodically to a light beam collecting window of an the relay by auxiliary optical fiber under the coordinated control of a signal processing and control module, and the light beam that is open and is cut off periodically is used for controlling the breakover and the break of a circuit at the output end of the optical relay; the modulation to the DC electric field to be tested which is externally added on an electro-optical crystal can be realized, so that the DC electric field to be tested is periodically applied and eliminated on the electro-optical crystal. The error caused by space charge drift in the electro-optical crystal used when the DC electric field is measured can be controlled within bounds by the micro optical DC/AC electric-field sensor, thus realizing the long-term, stable, reliable and precise measurement on the DC electric field with the optical method.

The invention discloses a photovoltaic assembly structure of a photovoltaic building part. The structure successively comprises a glass layer, a solar cell and a backboard from top to bottom. A backboard material is a metal sheet, glass or composite sheet material. An insulation film layer is arranged between the solar cell and the backboard. The solar cell and the insulation film layer are connected through an EVA rubber sheet. The insulation film layer and the backboard are connected through the EVA rubber sheet or an adhesion agent. The insulation film layer is a polyimide, polyethylene glycol terephthalate and polypropylene film or an organic silicon film. By using the photovoltaic assembly structure of the photovoltaic building part of the invention, an insulating property is good, a heat dissipation effect is good and production manufacturing cost is low; structure intensity of the photovoltaic assembly is increased; simultaneously, problems that bonding of the related materials is difficult, the EVA is easy to age and weather-proof performance is poor are solved; the photovoltaic assembly structure and other materials can be combined and form the photovoltaic building part and other products.

The invention relates to an electrolytic capacitor paper, which has improved voltage-resist property and reduced consumption. Wherein, it is made from ultra-fine glass micro fiber in paper slurry; the amount of ultra-fine glass micro fiber is 5-80% of electrolytic capacitor paper; the diameter of ultra-fine glass micro fiber is 0.1-10 mum. The invention uses the ultra-fine glass micro fiber to improve the voltage-resist property, reduce the resistance, improve the electric property, improve the service life, and reduce the energy consumption.

The invention relates to a novel insulating cylinder processing method. A die can be processed by a 1-3 mm sheet, and the size of an inner cavity of the die is adjustable. Preimpregnating epoxy digital mirror device (DMD) rolling materials are in thickness of 0.2mm, and the width of the preimpregnating epoxy DMD rolling materials are the same with the height of the insulating cylinder. The preimpregnating epoxy DMD rolling materials is utilized to roll on a foil winder and a coiler to the requested thickness (coiling effects of foil winder is better). The tail end is fixed stably by double faced adhesive tapes, and then the die is carried into an oasthouse to solidify. The solidification temperature is 130 degrees - 140 degrees. The solidification time is 3 hours -4 hours. After the solidification is cooled, screws can be adjusted by shrinking and the die is demolded. When two ends are in rubdown, the die can be used. The novel insulating cylinder processing method provides an insulating cylinder which is beautiful in appearance, excellent in insulating performance, extremely high in strength, simple in manufacturing crafts, low in cost, short in production cycle, good in laboring conditions for middle-high voltage electricity electric equipment.

The invention discloses a carbon ceramic linear resistor, and a preparation method of a composite insulating layer on the side surface of the carbon ceramic linear resistor. The preparation method ofthe composite insulating layer comprises the following steps: firstly, uniformly mixing bentonite, Zuoyun soil, calcined alumina and chromium oxide through ball milling to form high-resistance layer slurry, coating the side surface of an unsintered carbon ceramic resistor blank with the high-resistance layer slurry, and sintering together with a resistor to obtain a high-resistance layer on the side surface of the resistor; then uniformly mixing glass powder, mullite powder or calcined bauxite oxide, plastic clay and chromium oxide through ball milling to form glass glaze slurry, coating the surface of the high-resistance layer with the glass glaze slurry, and sintering to form the green and smooth insulating layer on the side surface of the resistor. The insulating layer prepared in the invention can obviously improve the endurance capacity of the carbon ceramic linear resistor to high-voltage and large-current impact, and prevent the resistor from flashover along the surface.

The invention discloses a pressure gel forming method for a multi-winding current transformer, and belongs to the technical field of electric manufacturing and electric equipment. According to the method, the traditional method that multiple windings are shielded respectively in a device correcting process is improved, the windings are combined and wrapped as a whole, and exhaust dead corners generated in the pouring process of the multi-winding current transformer are effectively avoided. In a transformer die preparation process, temperatures of different parts of a die are set, so that it is guaranteed that the curing process of gel materials which are injected firstly and the curing process of gel materials which are injected later basically keep consistent, and cracks generated due to an inconsistent curing contraction rate in the transformer are avoided. In the pressure gel forming process, viscosity of mixed materials is large, a certain period of time is needed when gas is exhausted from the inside of a product, and accordingly a staged material injection method is adopted. Besides, staged pressure maintaining can effectively avoid the situation that iron core magnetic permeability is reduced because of excessively large material injection pressure and accordingly error tests are not qualified, and therefore product quality and the pass percent are guaranteed.

The invention discloses aqueous tung oil-based insulating paint which is prepared from aqueous tung oil/epoxy resin, a curing agent, a sealing agent and an organic solvent, wherein the aqueous tung oil/epoxy resin is prepared by performing diene addition reaction on tung oil with maleic anhydride (maleic anhydride) and performing esterification reaction with polyethylene glycol (PEG) in sequence, further performing ring-opening reaction with epoxy resin E-51, and by finally neutralizing till that the pH value is 8.0-8.5 by using organic alkali; the curing agent is a curing agent which is sealed by using the sealing agent; the solid content of the insulating paint is 70-75wt%. The aqueous tung oil-based insulating paint is diluted with water in a ratio of 1:1, is dipped on a copper piece, and is cured for 3-4 hours at 120-130 DEG C, so that a paint film is prepared. The insulating paint is high in insulation strength and good in comprehensive property.

The invention provides a vacuum pouring and gelating method for epoxy resin, belonging to the technical field of preparation of a mutual inductor. The method comprises the steps: providing a final mixed material for epoxy resin pouring; conducting constant-temperature preheating and cooling a tire for a mould, and thus obtaining a cold-tire mould, wherein the mould comprises a coil winder and a mould base, and a thermal baffle plate is matted between the coil winder and the mould base; the temperature of the coil winder of the cold-tire mould is higher than the temperature of the mould base; under vacuum, pouring the final mixed material into the cold-tire mould, and thus obtaining a pouring model, wherein the temperature of the final mixed material is higher than the temperature of the mould base of the cold-tire mould and is lower than the temperature of the coil winder of the cold-tire mould; and orderly gelating and curing the pouring model. The method ensures that in the gelatingand curing process of the epoxy resin, the epoxy resin on the surface of the coil winder is gelated firstly and is cured from inside to outside. By the method, the mutual inductor has good electricalinsulation strength and tensile strength and high resin curing degree.

The invention relates to the technical field of transformer vacuum drying, in particular to a vacuum drying method for a power transformer body. The method comprises the following steps of (1), warming preheating processing: opening a steam valve of a heating calandria and warming the interior of a tank to enable the temperature to rise evenly, wherein the warming speed is 15 DEG C per hour, the warming time is 1-6 hours, and the furnace temperature is controlled to be 100-110 DEG C; (2), vacuumizing once per hour in the step (1), keeping the vacuum degree of 0.04 Mpa for 10-15 minutes, and stopping the vacuumizing and continuously heating; and (3) uniformly reducing the pressure in the vacuum tank evenly level by level after the preheating is finished, and keeping the vacuum degree of 0.02-0.05Mpa for 1-2 hours. According to the vacuum drying method for the power transformer body, vacuum drying processing is performed on the transformer body by heating a vacuum drying system, the drying time is short, the drying efficiency is high, the drying effect is good, and the electrical insulation strength and the product quality are effectively improved.

The invention discloses a composite insulated metallic oxide arrester which comprises a hollow insulation pipe (2), an umbrella skirt sleeve (3), a first metal end plate (4), a second metal end plate(5), a first metal elastomer (6), a discharge gap structure, a second metal elastomer (7) and zinc oxide resistance pieces (8) which are arranged in a stacking manner; the first metal elastomer (6), the discharge gap structure, the second metal elastomer (7) and the zinc oxide resistance pieces (8) are axially arranged in the hollow insulation pipe from top to bottom; and the first metal elastomer, the discharge gap structure, the second metal elastomer and the zinc oxide resistance chips are all form gaps (9) with the hollow insulation pipe in a radial direction of the hollow insulation pipe.By adopting variable series gap composite insulated metallic oxide arrester, during normal running, lightning overvoltage and operation overvoltage allowed by running voltage and electrical equipmentcan not be applied to the zinc oxide resistance chips, so that the phenomena of electrical aging and thermal destruction caused by long-term electrification are avoided, and meanwhile, the problem ofarcs caused by sustaining current between adjacent series gaps after overvoltage disappears can also be prevented.

The invention relates to the technical field of plasmas, and specifically relates to a plasma generating device. The device comprises a high-voltage discharge tub, a grounding discharge tube, a high-voltage-side insulating support plate and a grounding-side insulating support plate, wherein the high-voltage discharge tube and the grounding discharge tube are respectively provided with wiring terminals; the high-voltage-side insulating support plate and the grounding-side insulating support plate are respectively provided with through wiring through holes, the wiring terminal of the high-voltage discharge tube is fixed on the high-voltage-side insulating support plate and is connected with a high-voltage power supply through the wiring through hole of the high-voltage-side insulating support plate, the grounding discharge tube is fixed on the grounding-side insulating support plate and is grounded through the wiring through hole of the grounding-side insulating support plate, and the high-voltage-side insulating support plate and the grounding-side insulating support plate are arranged on two opposite sides. According to the plasma generating device, the insulating property of the plasma generating device can be remarkably improved.

The invention relates to a layer coil for an oil-immersed distribution transformer and a manufacturing method of the layer coil. The layer coil comprises multiple layers of low-voltage coils and high-voltage coils, which are sequentially wound from the inside to the outside, wherein a main empty path is formed between the high-voltage coils and the low-voltage coils; the high-voltage coils are wound on the outer side of the main empty path; the high-voltage coils are sequentially wound by a first layer of coil, a second layer of coil and an Nth layer of coil from the inside to the outside; an interlayer insulating layer is arranged between two adjacent coils of the high-voltage coils; stepped insulating layers are arranged at the upper ends and the lower ends of the high-voltage coils; and the thickness of the insulating layer at the inner side is greater than that of the insulating layer at the outer side. The layer coil for the oil-immersed distribution transformer has the beneficial effect that the electric insulation strength between the high-voltage coils and the low-voltage coils is improved.