32results about How to "Increase the breakdown voltage value" patented technology

The invention belongs to the technical field of insulating oil for power transformers with high overload capacity, and particularly relates to high-overload transformer oil and a preparation process thereof. The high-overload transformer oil is prepared from natural ester insulating oil and mineral insulating oil according to the volume percentage of (40%-50%):(60%-43%). The preparation process comprises the following steps: firstly, heating the natural ester insulating oil to 80 to 95 DEG C under a vacuum stirring condition; then under a vacuum condition, adding the mineral insulating oil into the natural ester insulating oil, and carrying out mechanical stirring and then ultrasonic oscillation; finally, carrying out two-stage vacuum filtering treatment on treated transformer oil, wherein the closed-cup flash point of a treated oil product is greater than or equal to 155 DEG C. The transformer oil disclosed by the invention is high in physical, chemical and electrical properties, low in kinematic viscosity, high in flowability and long in service life; the transformer with high overload capacity is high in overload capacity; faults of the transformer are reduced, and the problem of 'load returning' is effectively solved; the safety stability of the transformer is improved; the high-overload transformer oil has a high popularization and application value.

The embodiment of the invention discloses a preparation method of a high-dielectric polymer composite film. The preparation method is characterized by comprising the following steps of: sufficiently mixing a main material A and a certain quantity of first solvent to obtain a first slurry; mixing an organic dielectric material B with high dielectric constant and low loss and a certain quantity of second solvent, and dispersing the mixture to obtain a second slurry; sufficiently mixing the first slurry and the second slurry to obtain a third slurry; standing and curing the third slurry in a vacuum container to obtain a uniformly-mixed gel-state high-dielectric organic composite; and adding the gel-state high-dielectric organic composite into an extruding machine for heating and extruding, quenching a molten film through a cooling roller after the molten film is extruded, stretching the extruded cooled film in two ways through a film stretch forming machine, and finally, carrying out heat setting at the temperature of 150 DEG C to obtain the high-dielectric polymer composite film. The film has a high dielectric constant value, a high breakdown voltage value and a low dielectric loss value.

The invention discloses a production process of a double-imine copper lapped flat wire. The production process of the double-imine copper lapped flat wire comprises the following steps: (1) constant tension paying-off; (2) straightening and cleaning; (3) coating anti-oxidation material; (4) lapping double layers of polyimide films; (5) lapping glass fibers; (6) impregnating varnish; (7) baking in an oven; (8) coating an adhesive layer; and (9) cooling through cold air, online detection of voltage, metering and constant tension paying-off. The production process of the double-imine copper lapped flat wire is simple, an insulator outside the double-imine copper lapped flat wire comprises double layers of the polyimide films, an insulation layer mixed with the glass fibers and the impregnating varnish and an acetal adhesive layer from inside to outside, and is good in sealing performance. The double-imine copper lapped flat wire is good in insulation performance, high in puncture voltage value which reaches more than 9000 V, and good in heat resistance, the quality problems such as crack and fiber-falling are not easy to occur, the phenomenon of puncturing among turns does not occur in the winding process of a coil, and the mechanical damage is small.

The invention discloses a silicon-on-insulator laterally diffused metal oxide semiconductor (SOI LDMOS) device containing a composite drift region. The device sequentially comprises a grid oxide layer, a top silicon layer, a buried oxide layer and a bottom silicon layer from top to bottom, wherein the top silicon layer contains the composite drift region; and the composite drift region contains a first drift region and a second drift region, wherein the first drift region is adjacent to a channel region and is encircled by the second drift region. By adopting the composite drift region in the device, the maximum electric field value of the drift region close to one end of the channel, and the breakdown voltage value is improved; and because the first drift region is thinner than the top silicon layer, the additional value of the on resistance caused by the first drift region is reduced, and the on conduction property is improved.

A grooved MOS (metal oxide semiconductor) forming method includes the steps: providing a semiconductor substrate; forming a groove in the semiconductor substrate; using the thermal oxidation process to form first gate dielectric layers at the bottom and on the side walls of the groove; using the high-temperature oxidation and deposition process to form second gate dielectric layers on the surfaces of the first gate dielectric layers; and filling a polycrystalline silicon layer in the groove. By the grooved MOS forming method, the problems of poor electric performance and low technical yield of grooved MOSs are solved.

The invention discloses a high-strength, high-hardness and weather-resistant porcelain insulator. The insulator is prepared from the following raw materials: kaolin, potassium feldspar, silicon dioxide, quartz stone, zirconium oxide and modified vanadium-cerium composite oxide powder. According to the invention, the raw material formula of the porcelain insulator is improved, and the obtained insulator has high compressive strength and high breakdown voltage value, and is not easy to break down and damage. The insulator is good in weather resistance and suitable for areas with severe temperature changes, and the maintenance cost is greatly reduced.

The invention discloses a dedicated photoelectric encoder with a special insulation structure for a wind driven generator, comprising a sealing element, an insulating sleeve, bearings, an insulating gland, a threaded compression element, a photoelectric system, a grating disk, a support ring, a circuit board, a rear cover, a waterproof cable connector, a coder main body, a hollow shaft, a fixed support and a space ring, wherein the hollow shaft is fixedly connected with an output of the generator in accordance with the accuracy matching requirement; the grating disk is fixed on the hollow shaft by the support ring; the hollow shaft is connected with the coder main body by the sealing element, the two bearings, the insulating sleeve, the insulating gland and the threaded compression element; the space ring is arranged between the two bearings; the photoelectric system and the circuit board are arranged on the coder main body; the coder main body is fixed on the generator frame by the fixed support; and cables are connected with the circuit board and are output by the waterproof sealed cable connector. The dedicated photoelectric encoder is simple in structure, low in cost and good in insulation performance, can improve the breakdown voltage value greatly, and meets the high-reliability and long-life working requirements in heavy-load and severe environments; and by using the dedicated photoelectric encoder, insulation bearings can not be used.

The invention discloses a withstand voltage bipolar transistor and manufacturing method thereof, and mainly solves the problem that an existing bipolar transistor is low in resistance and has a low withstand voltage value in an EMP environment. The withstand voltage bipolar transistor includes a substrate (1), a heavily-doped collector region (2), an epitaxial layer (3), a base region (4), an emitter region (5), a SiO2 layer (6), a SiO2 trench and a through hole. The heavily-doped collector region is cylindric, is located in the epitaxial layer, and divides the epitaxial layer into two parts,i.e., an in-cylinder epitaxial layer and outside-cylinder epitaxial layer; the in-cylinder epitaxial layer includes the cylindrical base region and the SiO2 trench which has the same junction depth asthe emitter region; and the base region includes the emitter region which in a circular ring shape. The method provided by the invention effectively reduces a current crowding effect on an emitter junction, thereby improving a withstand voltage characteristic of a collector junction; and solves the problem in the prior art that the overall withstand voltage characteristic of the transistor cannotbe improved only by protection of a specific input and output end, and achieves the purpose of improving transistor reliability on the whole.

The invention provides a submersible motor winding and power supply connecting structure, which comprises a motor winding wire connector and a power cable lead-out wire connector, wherein the motor winding wire connector and the power cable lead-out wire connector are in parallel lapping joint in a manner of facing each other and are sleeved with a metal pipe, the metal pipe fastens the two connectors in a cold pressure welding manner, is coated with a layer of clay, the periphery of the clay is level with the outer surface of an motor winding wire outer sheath, outer diameters of the motor winding wire outer sheath and a power cable lead-out wire outer sheath are identical, and the clay is coated with a heat-shrinkable casing pipe. By adopting the structure, the two connected connectors have no burr and are regular in shape when compared with two connectors connected by adopting a tin soldering method in the prior art, the metal pipe is coated with the layer of clay and sleeved with the heat-shrinkable casing pipe, and the residual air in the inside is extruded out, thereby eliminating the hidden dangers of discharge; and by adopting the improved connectors, an insulation resistance value and a breakdown voltage value are greatly improved, the submersible motor winding and power supply connecting structure is stable in performance when immersed in water for a long time, and the service life of the product is prolonged.

The invention involves the method that the electricity measures appearance to adjust zero machines and exaltation electricity to measure gauge to bear air to broke through an electric voltage value, adjusting zero machines to include partiality stalk and a dish noodles among them, lacking of impartiality stalk to pass to connect piece with a circle dish noodles to make to lack of impartiality a conjunction. Because the invention adjusts zero machines to establish a dish noodles, and clip to establish in the organic glass cover and outer shell of, and establish one to open a head of having the cave slot to nail in the middle of outer shell surface at circle the center of the dish noodles, user as long as use screw knife expediently 360 degree to revolve and should adjust zero machines, lack of impartiality stalk to arouse a direction piece or so swing, arouse to point a needle swing thus, attain to point needle to adjust zero of purpose. Bears air to broke through an electric voltage value for the sake of the exaltation moreover with satisfy new safety standard (request gauge generally at least bear to press 5500 volts above), direction piece and of outer shell which needs enlargement to take to give or get an electric shock a body climb electricity distance, also namely enlargement circle the diameter of the dish noodles, can raise to bear air to broke through an electric voltage value to match various the most strict safety standard.