19 results about "Electric strength" patented technology

The present application relates to a kind of high uniformity transformer insulating paperboard dynamic forming process and integrated preparation system, belong to transformer insulating material processing technical field, the system includes multiple-source modification module, ultrasonic fluidization module, dynamic reconfiguration module and gradient compaction module.Processing steps cover: slurry is carried out electromagnetic polarization and is compounded nanofiber to break flocculation;In the sizing stage, microflow beam treatment is carried out by applying ultrasonic field;In the forming net part, Z-axis interpenetration interweaving is generated by pulse vacuum induction fiber;Finally, temperature gradient formed by multistage temperature control press roller guides moisture migration and completes compaction.The present application introduces electric physical intervention and fluctuation pressure field, realizes the accurate control of fiber from micro-dispersion to three-dimensional reconstruction, effectively solves the problem of insufficient interlaminar bonding force and tightness of insulating paperboard, improves the electrical strength and mechanical robustness of transformer insulating component.

The application discloses a Teflon insulating material product and a preparation method thereof. The method comprises the following steps: mixing and calendering polytetrafluoroethylene fine powder, perfluoroalkoxy resin micro powder, polymethyl methacrylate flaky particles and liquid processing aids, and performing embossing treatment on one side of the mixture to obtain a main body insulating layer strip; then, inner layer strip and outer layer strip are prepared, and the inner layer strip and the outer layer strip are combined into a blank through multi-layer staggered winding; subsequently, the polymethyl methacrylate flaky particles are removed through staged heat treatment to form cavities, and the cavity edges are closed, and finally, the Teflon insulating material product is obtained. The product is internally formed with a discrete closed microcavity structure which is continuously staggered and distributed along the length direction, and has low dielectric constant, low dielectric loss, high electrical strength and high partial discharge inception voltage.

The invention discloses a device and method for testing the voltage breakdown performance of a cable in a high-temperature environment, and belongs to the technical field of electrical insulation, the device comprises an insulation bin, the two sides of the insulation bin are fixedly connected with an access bin and an outlet bin respectively, connecting holes are formed in the connecting positions of the access bin and the insulation bin and the connecting positions of the outlet bin and the insulation bin, and the connecting holes are communicated with the insulation bin. An insulating base is arranged at the bottom in the insulating bin, two grooves are formed in the upper surface of the insulating base, a supporting bracket is clamped in each groove, the upper parts of the supporting brackets are in contact with a cable to be tested, a conductive mechanism is arranged on the front side of the insulating base, and the conductive mechanism is connected with the insulating base. According to the test equipment, the voltage breakdown phenomenon of the cable under the real use condition can be simulated, the obtained test data is closer to the real use condition, and the electrical strength performance of the cable insulation material can be better evaluated.

The invention relates to the technical field of power cable insulating materials, and discloses a compression-resistant insulating power cable material, a preparation method and a power cable, the insulating material comprises the following raw materials: low density polyethylene, ethylene propylene diene monomer, N, N '-m-phenylenedimaleimide, 2-mercaptobenzimidazole, zinc stearate, zinc methacrylate and dicumyl peroxide. In the preparation process, N, N '-m-phenylenedimaleimide and 2-sulfydryl benzimidazole are subjected to an in-situ addition reaction to generate a macromolecular crosslinking precursor, and free sulfydryl masking is realized. The precursor and zinc methacrylate are subjected to coordination to form polar nodes, and a homogeneous cross-linked network containing electron deep traps and dynamic sacrificial bonds is constructed after cross-linking and curing. Under the condition that no inorganic filler is added, irreversible slippage and space charge accumulation of macromolecular chain segments in an insulator are effectively inhibited, so that the cable material has high compression resistance, low creep deformation, high electrical strength and long-acting thermo-oxidative aging resistance.

The application discloses a kind of parallel layer electrical strength test methods of fiber reinforced epoxy resin insulating pipe, comprising: obtaining the parallel layer sample of multiple fiber reinforced epoxy resin insulating pipes;On each parallel layer sample, a plurality of equal-diameter circular holes are uniformly opened;The parallel layer sample is placed in transformer oil, the transformer oil is heated to preset temperature, and the voltage is gradually increased to the circular hole of the parallel layer sample Breakdown;The median value of the voltage of the circular hole breakdown of multiple parallel layer samples is used as the value of the electrical strength of the parallel layer of the fiber reinforced epoxy resin insulating pipe.Solve the problem that the electrical strength of the fiber reinforced epoxy resin insulating pipe for ultra-high voltage electrical equipment is higher, and the existing standard specifies that the test method is difficult to effectively determine.

The utility model discloses a pressure sensor, which comprises a base component, the base component comprises a base and a pressure sensing component, the pressure sensing component comprises an elastic frame and a silicon strain gauge, the elastic frame comprises an elastic sheet, the elastic sheet is fixedly connected with the silicon strain gauge, and the silicon strain gauge is fixedly connected with the base. A circuit blocking piece is arranged between the base and the pressure sensing component, and the base, the circuit blocking piece and the pressure sensing component are fixedly connected. The circuit blocking piece blocks circuit conduction between the elastic piece and the base, the risk that electronic components are damaged is reduced, and the electrical strength of the product is improved.

The application discloses a kind of method and device for detecting the electrical strength of polypropylene film, belong to electrical strength detection technical field, its device includes test platform, lower foil, mask, test film, upper foil, first reel group, second reel group and third reel group, and the mask is provided with through-hole;Its method includes that upper foil is electrified, makes upper foil embed mask through-hole under the action of electrostatic force, then continues to boost, until test film is broken down, records the voltage and breakdown position when breakdown, after breakdown, the relative position of lower foil, test film, upper foil and mask through-hole is adjusted by first reel group, second reel group and third reel group.The application is realized by first reel group, second reel group and third reel group that lower foil, test film and upper foil are replaced automatically, so as to solve the technical problem that electrode needs to be manually wiped by technical personnel after multiple tests in prior art, effectively reduce the work burden of technical personnel.

The application discloses a kind of high surface natural micropore structure regulation-based high surface withstand voltage polyimide and preparation method and application thereof, belong to high voltage insulating material technical field, after drying diamine is dissolved in solvent A, then add dianhydride, after stirring uniformly, obtain polyamide acid solution;Add pore forming agent again, high-speed stirring is uniformly dispersed, obtain mixed viscous solution C;After coating, drying, imidization high temperature heating, and natural cooling, immerse in liquid B and extract pore forming agent, after drying, obtain high surface natural micropore structure regulation-based high surface withstand voltage polyimide.The polyimide surface has natural pore structure, surface is along the surface of electric field, and the through-hole structure is densely distributed along the surface of electric field, and the electron is easy to drop into the through-hole structure in the jumping multiplication process when flashover, and it is difficult to return to the surface, so that the secondary electron multiplication process is inhibited, the probability of forming secondary electron avalanche is reduced, so as to realize the improvement of surface withstand voltage.

The utility model provides a high temperature high pressure pulse cable for nuclear power station, include: single copper conductor and cross -linked polyimide insulating layer of extruding on copper conductor constitute insulating wire core, there is tinned copper wire double -layer weaving outside insulating wire core, adopt the outer sheath of cross -linked polyethylene material and extrude in weaving layer outside. The utility model in the conductor adopts single copper conductor to reduce the gap discharge under high pressure, because the conductor outer diameter is consistent, reduces the attenuation, guarantees the stability of signal transmission, the cross -linking technology adopts electron irradiation process in insulating layer, improves the temperature resistance grade, the radiation resistance of cable and the uniformity of cross -linked polyimide medium, reduces the loss of medium transmission, strengthens the electric strength, the weaving layer adopts the double shielding of double -layer copper wire weaving, can effectively shield the outside interference, guarantees the smooth transmission of signal, the outer sheath adopts cross -linked polyethylene sheath material, improves the heat resistance, the insulating property and corrosion resistance of cable.

The application discloses a kind of composite core, stator and outer rotor permanent magnet synchronous motor, including main body core unit, core insulation composite unit A and core insulation composite unit B;Core insulation composite unit A includes core A, the corresponding end of the main body core unit corresponds with the core A, and its inner surface is in contact with the corresponding end surface of main body core unit, and its outer surface is integrally coated with insulator A;Core insulation composite unit B includes core B, the corresponding end of the main body core unit corresponds with the core B, and its inner surface is in contact with the corresponding end surface of main body core unit, and its outer surface is integrally coated with insulator B;The application effectively reduces the axial insulation thickness between coil winding and core end under the premise of guaranteeing electrical strength, and then effectively reduces the winding length and winding resistance, improves the working efficiency of its application motor, while it can improve the insulation stability and insulation life of its application motor.

The application discloses a large-current copper core conductor polypropylene insulation medium-voltage power cable and belongs to the technical field of cable processing, which is used to solve the technical problem that the insulation and heat aging resistance of the polypropylene insulation medium-voltage power cable in the prior art need to be further improved, and specifically comprises a copper conductor, a conductor shielding layer and an insulation layer arranged in sequence from inside to outside. The application effectively improves the electrical strength, mechanical strength and heat aging resistance of the polypropylene insulation layer by optimizing the composition of the polypropylene insulation layer, and introduces the conductor shielding layer, the metal shielding layer and the flame-retardant wrapping layer in the multilayer structure outside the high-purity round-corner copper conductor, thereby significantly improving the comprehensive performance of the medium-voltage power cable, and achieving the technical effects of enhancing current carrying capacity, prolonging the service life of the cable and improving the operation safety.

The invention relates to a high-performance copper bar insulation winding treatment method, which comprises the following steps of: winding a qualified copper bar by using a winding belt, baking the copper bar in an oven for four hours, placing the copper bar on a hanger, spraying a flame-retardant solvent on the winding surface of the copper bar, and naturally ventilating and drying to form a curing layer on the outer surface of the wound copper bar. Under the early-stage condition of not influencing the conductivity of the train copper bar, the current-carrying stability of the copper bar is improved, the voltage-withstanding grade, heat resistance, oil resistance, chemical corrosion resistance, flame retardance and aging delay are improved, and through the combination of the nano-modified epoxy resin tape and tension control, it is ensured that an insulating layer is compact, free of bubbles and high in adhesive force (0-1 grade in a gridding method), and the service life of the insulating layer is prolonged. The electrical strength is high (AC 3.5 kV / 1min can be borne); the stepped baking and curing process avoids internal stress cracking caused by temperature shock, promotes sufficient cross-linking and curing of the resin, and significantly improves the heat resistance, mechanical strength and long-term aging performance of the insulating layer.

The utility model discloses an insulating oil dielectric strength tester, include: tester subassembly, including the box, the top of box is equipped with electric strength test subassembly, the top one side of box is equipped with high -voltage generator, dismounting mechanism includes the adjustable positioning seat and the inside positive and negative motor of box for the electrode head outside of electric strength test subassembly. The utility model discloses the dismounting mechanism that sets up, has effectively avoided electrode head and oil cup connection closely, the problem that is difficult to disassemble and clean, when, through the drive electric push rod and make adjustable positioning seat the first connecting rod, second connecting rod and third connecting rod connection between the rotation seat and push block and pull down, make electrode head separate from the inside of oil cup, and then can take out oil cup and carry out separate cleaning, also can clean the independent electrode head simultaneously, therefore can avoid the inconvenience caused by artificial disassembly.

The application provides a method for evaluating the insulation performance of organic composite solid insulation material. The application researches and finds that the porosity and electrical strength of the organic composite solid insulation material satisfy the following relation: Y = - [(M / 100000*2.52) + 0.005]X + (19 + 2); wherein Y is the electrical strength, X is the porosity, and M is the number average molecular weight of the polymer matrix. The evaluation method of the application starts from the organic composite solid insulation material, tests the porosity and electrical performance of the organic composite solid insulation material, and establishes a correlation between the porosity and the insulation performance of the organic composite solid insulation material. Using the evaluation method, on one hand, the insulation performance of the organic composite solid insulation material can be simply and quickly evaluated; on the other hand, the occurrence of unqualified electric appliance products can be reduced from the root, thereby reducing the cost and reducing the personnel casualty.

The utility model belongs to the technical field of combined electric appliances, and particularly relates to an SF6N2 mixed gas insulated metal-enclosed environment-friendly combined electric appliance. The SF6N2 mixed gas insulated metal-enclosed environment-friendly combined electric appliance comprises a bottom frame on which a circuit breaker and a bus three-position switch are arranged, and is characterized in that one end of the circuit breaker is connected with an isolating switch, the other end of the circuit breaker is connected with a current transformer, the current transformer is connected with a circuit three-position switch, the circuit three-position switch is connected with a branch bus, and the branch bus is connected with the isolating switch. And a quick grounding switch is connected below the branch bus. The beneficial effects of the utility model are that except that the gas chamber of the circuit breaker is filled with SF6 gas, the other gas chambers are all filled with SF6N2 mixed gas, the insulation performance of the original SF6 is maintained, the electric strength is high, the arc extinguishing capability is strong, the discharge amount of greenhouse gases such as SF6 is reduced, the structure is compact, the reliability is high, the modularization is high, and the installation and debugging are convenient and fast.

The invention is suitable for the technical field of thermal management system sensing and high-voltage insulation safety, and provides a parameter calculation method of an insulation three-in-one sensor in a thermal management system. Obtaining a high voltage value, an effective insulation thickness, an electric field non-uniform coefficient and material electric strength to calculate maximum equivalent electric field intensity and an insulation margin, and taking the condition that the insulation margin meets a preset insulation margin as a structural design constraint; the output voltage of the power supply is adjusted by using a PWM duty ratio mode, and the PWM duty ratio is adjusted by using discrete PI to control the stable voltage output of the power supply; the temperature is obtained, the original pressure is read for compensation, the compensated pressure is calculated, the compensated pressure is filtered, and the corrected pressure is output; wherein the insulation margin can be calculated, threshold constraint can be set, the influence of power supply fluctuation on sensing output is reduced by controlling power supply voltage stabilization output, further, the pressure output stability and the anti-noise capability are improved by performing temperature drift compensation and fusion filtering on the pressure, and the user experience is further improved.

The utility model discloses a multi-station test tool, which is characterized in that two copper bars are arranged on a base to be connected with one pole of a voltage withstanding instrument, a plurality of test probes are arranged above the base to be connected with the other pole of the voltage withstanding instrument, and the plurality of test probes are arranged on a probe support along the extension direction of the copper bars. Therefore, a plurality of test stations in one-to-one correspondence with the plurality of test probes can be formed between the two copper bars, a plurality of to-be-tested aluminum heating tubes can be simultaneously placed for detection, the detection efficiency is greatly improved, heating electrodes at two ends of the aluminum heating tubes placed in the test stations are respectively in contact with the two copper bars, and the test efficiency is greatly improved. The test probe is driven by the lifting air cylinder to move downwards to be in contact with the aluminum heating tube shell in the test station, a detection circuit for detecting the insulation and voltage resistance performance and dielectric strength of the aluminum heating tubes is formed, and compared with a traditional detection mode that workers manually detect the aluminum heating tubes one by one, the detection steps are simplified, the detection efficiency is improved, and the detection cost is reduced. And the labor cost of PTC heater production is reduced.

The present application relates to a kind of large motor stator end coil winding vacuum potting device and method, motor stator includes core and coil winding, including inner side tight ring and outer fixed ring, inner side tight ring is achieved with the sealing fixed connection of core end inner wall by silica gel sealing connection component, outer fixed ring is formed with the upper end of inner side tight ring through sealing cover plate and forms vacuum potting cavity;Silica gel sealing connection component includes silica gel sleeve that is set in the outer side of silica gel sleeve connecting ring part and is set on horizontal connecting portion and horizontal circumferential extrusion group.This application has the following advantages: by improving the sealing of vacuum potting cavity and the concentricity of vacuum potting cavity and core, completely exclude the bubble residual of coil turn and layer, improve the electrical strength, bonding strength and impact resistance of insulating layer, avoid the stress concentration caused by the uneven shrinkage of insulating layer due to concentricity deviation.

The invention belongs to the technical field of module power supplies, and provides a small-size isolation module power supply which comprises a shell and a circuit board assembly encapsulated in the shell. The circuit board assembly adopts an isolated open-loop topology and comprises a printed circuit board, and a primary side component, a secondary side component, a transformer, an input pin and an output pin which are arranged on the printed circuit board. The printed circuit board is divided into three paratactic subareas; the transformer is a planar transformer using a square annular magnetic core; the primary and secondary windings are annularly integrated at the periphery of the magnetic core window, so that the voltage endurance capability of the primary and secondary sides is effectively enhanced; and the circuit board assembly can be effectively wrapped by the pouring sealant, so that the dielectric strength of the product is further improved, and the power supply module can stably work for a long time under the condition of high isolation voltage.