288results about "Varistor cores" patented technology

The invention provides an optimization method and an optimization device for electrical performance of a ZnO piezoresistor based on O2 heat treatment. According to the method, O2 is introduced into the ZnO varistor under the condition of heat treatment, and oxygen vacancies in the ZnO varistor are reduced under the oxygen atmosphere, so that the donor concentration is reduced, the carrier concentration is reduced, and the electrical performance of the ZnO varistor is remarkably improved. Besides, the optimization device provided by the invention is used for the heat treatment step in the electrical performance improvement process of the ZnO varistor, and the front and back surfaces of the ZnO varistor can be in full contact with gas in the heat treatment process, so that the electrical performance is uniformly and effectively improved.

A sintered body has a first end face and a second end face opposite to each other in a first direction and a first side face and a second side face opposite to each other in a second direction. A first end face electrode is disposed on the first end face except for end portions of the first end face in the second direction. A second end face electrode is disposed on the second end face except for end portions of the second end face in the second direction. A first side face electrode is disposed on the first side face except for end portions of the first side face in the first direction. A second side face electrode is disposed on the second side face except for end portions of the second side face in the first direction.

The invention relates to a zinc oxide lightning arrester and a transformer substation, and relates to the technical field of lightning arresters, the zinc oxide lightning arrester comprises a silicone rubber jacket, a plurality of umbrella skirts fixedly arranged on the peripheral surface of the silicone rubber jacket, and sealing fittings for blocking openings at two ends of the silicone rubber jacket, and the silicone rubber jacket is internally provided with a plurality of resistance valve plates; an insulating sleeve arranged outside the resistance valve plate in a sleeving mode is arranged in the silicone rubber outer sleeve, a rainproof cap made of silicone rubber is arranged on the periphery of one end of the silicone rubber outer sleeve in a sleeving mode, and the inner wall of the rainproof cap abuts against the peripheral face of the silicone rubber outer sleeve; when the zinc oxide lightning arrester is installed in an outdoor severe environment along the vertical direction, the protective cap can be used for protecting the upper end of the zinc oxide lightning arrester in advance, so that the waterproof and moisture-proof performance of the zinc oxide lightning arrester is improved; when the lightning arrester is transported for a long distance, the two protective shells are detachably arranged outside the silicon rubber jacket, so that the possibility that the silicon rubber jacket is damaged in the transportation process is reduced.

The present application provides an arrester. The arrester comprises: a housing, the housing comprising a first mounting portion and a second mounting portion, the first mounting portion being provided with a first mounting cavity, the second mounting portion being provided with a second mounting cavity, and the first mounting cavity being communicated with the second mounting cavity; an arrester core, mounted in the second mounting cavity; a sealing assembly, the sealing assembly being mounted in the first mounting cavity and comprising a first elastic member and a sealing cover, one end of the first elastic member abutting against the top of the first mounting portion, the other end of the first elastic member abutting against the sealing cover, and a pressure relief hole communicated with the second mounting cavity being provided on the sealing cover; and an anti-explosion structure, the strength of the anti-explosion structure being smaller than that of the housing, the anti-explosion structure being located between the sealing cover and the arrester core, and the anti-explosion structure being configured to be capable of plugging the pressure relief hole. The arrester of the technical solution of the present application solves the problem in the prior art of unstable explosion values at weak points of arresters having pressure relief devices.

The invention relates to the technical field of lightning arrester manufacturing, in particular to a method for recycling micro powder for MOA piezoresistor ceramics. The method comprises the following steps: S1) testing the residual amounts of a dispersing agent and a binding agent in the micro powder for the MOA piezoresistor ceramic, and respectively recording the residual amounts as x and y; s2) mixing the micro powder with water, a binding agent and a dispersing agent to obtain slurry; the mass ratio of the micro powder to the water to the binding agent to the dispersing agent is 4000: 2000: (600-y): (20-x); and S3) granulating the slurry until the slurry contains water, and molding to obtain the resistor disc. The method provided by the invention not only reduces the loss of the micro powder, but also improves the utilization rate of the raw materials.

The utility model provides a lightning impulse protection device for a transformer, and relates to the technical field of lightning arresters, the lightning impulse protection device for the transformer comprises a mounting plate, two ends of the mounting plate are respectively provided with a protection mechanism, the protection mechanism comprises two rectangular blocks, the inner walls of the two rectangular blocks are rotatably connected with a rotating shaft, and the rotating shaft is connected with the mounting plate. A rotating shaft is arranged on the outer side of the screw rod, a coil spring is arranged on one side of the rotating shaft, an L-shaped rod is fixedly connected to the outer surface of the rotating shaft, and a piston block is rotationally connected to one end of the screw rod. The piston block slides on the inner wall of the rectangular groove by rotating the screw rod, so that the airbag sheet deforms and expands outwards, the outer side of the joint of the lightning arrester body and the high-voltage line is wrapped and protected, the influence of rain and sun on the outer side of the joint of the high-voltage line and the lightning arrester body is reduced as much as possible, the service life of the lightning arrester body is prolonged, and the use effect of the lightning arrester body is improved.

The present invention relates to a method for producing a multilayer varistor (1), having the steps of: preparing a metal paste (103) comprising silver and nickel, wherein the mass proportion of nickel in the metals of the metal paste (103) is at most 25%; applying the metal paste (103) to a ceramic green foil (102); applying a further ceramic green foil (102) to the metal paste (103) to produce a sandwich-like structure; and sintering the green foils (102) with the applied metal paste (103), wherein the green foils (102) are converted to ceramic layers (2) and the metal paste (103) is converted to an inner electrode (3).

The invention provides a lightning arrester for a 10KV distribution network, and relates to the technical field of lightning arresters, the lightning arrester comprises a shell part and a core body, the shell part is provided with a cylindrical inner cavity, and the core body is arranged in the inner cavity of the shell part; the core body comprises at least one zinc oxide resistor disc and one or two discharge cavity assemblies, and by designing the structure of the core body and the design of the discharge cavity assemblies, the two ends of a cylinder structure formed by the zinc oxide resistor disc and the discharge cavity assemblies form an open-circuit state, and compared with a traditional low-energy-consumption state, the energy consumption is reduced; the lightning arrester can solve the problem that the lightning arrester is in a low-energy-consumption state for a long time, so that energy conservation is realized, and when a line bears a high-voltage state, a pole piece in the discharge cavity assembly generates a discharge effect, and the discharge cavity assembly is in a conducting state; the zinc oxide resistor disc is also in a conducting state when the circuit bears high voltage due to the characteristic that the zinc oxide resistor disc belongs to a non-linear resistor piece, so that the core body is in a conducting state, the circuit is conducted with the ground in a short time, and the purpose of protecting the power distribution element is achieved.

The invention belongs to the technical field of high-voltage electric appliance material preparation, and particularly relates to a zinc oxide resistor disc and a preparation method and application thereof. The preparation method comprises the following steps: (1) pre-sintering zinc oxide powder; (2) mixing the zinc oxide powder obtained in the step (1), an auxiliary agent and a dispersion liquid, and carrying out ball milling to obtain slurry; the particle size D50 of the slurry is 0.8-1.2 [mu] m, and the dispersity is greater than or equal to 95%; (3) performing spray drying and granulation on the slurry to obtain granulation powder; (4) carrying out molding and first sintering on the granulated powder to obtain a resistor disc semi-finished product; the first sintering adopts sectional sintering; and (5) forming an electrode layer on at least one surface of the resistor disc semi-finished product by adopting a vacuum sputtering and / or electrophoretic deposition process, and performing secondary sintering and annealing. The contact resistance of the zinc oxide resistor disc is less than or equal to 5m omega; and after 1000 hours of aging in a 85 DEG C + 85% RH environment, the leakage current increase is less than or equal to 2 [mu] A, and the performance degradation rate is less than or equal to 5%.

The application relates to the technical field of lightning protection equipment manufacturing, and discloses a composition for preparing a high-stability direct-current resistance sheet, the high-stability direct-current resistance sheet, a preparation method and application thereof. The composition contains the following components: ZnO, Bi2O3, Sb2O3, Co2O3, MnO2, Cr2O3, SiO2, NiO, SnO2, BN, Al(NO3)3.H2O and silver glass powder. The resistance sheet prepared by using the composition has high stability. In addition, the method can avoid resistance sheet grain coarsening, increase the non-uniformity of the internal microstructure and increase the number of pores; the excellent basic electrical performance of the direct-current resistance sheet can be ensured. Meanwhile, the method can make the electrical performance change of the resistance sheet under current impact and the continuous direct-current electric field smaller, and the performance is more stable.

The invention discloses a large-through-flow varistor and a preparation method thereof, and belongs to the technical field of varistors, the varistor is prepared from the following raw materials: 93 to 96 mol percent of modified ZnO, 1.2 to 1.6 mol percent of Bi2O3, 0.5 to 1.5 mol percent of Co3O4, 0.3 to 0.8 mol percent of Mn2O3, 1.0 to 3.0 mol percent of Sb2O3, 0.3 to 0.8 mol percent of NiO and 0.05 to 0.3 mol percent of Li2CO3; a silane coupling agent with a fluorinated quaternary ammonium salt structure is adopted to modify the surface of ZnO, and the quaternary ammonium salt structure improves the isoelectric point of ZnO, so that ZnO is positively charged at a relatively high pH value, the interaction with an anionic dispersant is enhanced, and the effect of the anionic dispersant on slurry is improved; f <-> introduced by the silane coupling agent is uniformly dispersed on the surface of ZnO, during subsequent sintering, Li < + > is used as a diffusion carrier, the migration rate of F <-> in crystal lattices can be improved through the synergistic effect of Li < + > and F <->, and the property of the ZnO varistor is enhanced by introducing Li < + > and F <->.

The invention belongs to the technical field of resistor electrical elements, and particularly relates to a zinc oxide resistor with high stability and low cost and a preparation method thereof. The zinc oxide resistor comprises the following components: large-particle-size zinc oxide elementary substance powder, small-particle-size zinc oxide elementary substance powder, bismuth trioxide, bismuth stannate, nickel monoxide, manganous-manganic oxide, cobaltosic oxide, nano tin powder, diboron trioxide, nano silver powder, a binder, a dispersant and deionized water. The invention provides the preparation method of the resistor disc with low cost and high through-current impact stability, large through-current is realized, the stability is relatively good after large-current pulse surge impact, the cost is low, the resistor disc can meet the application requirements of more occasions, the cost is low, and the resistor disc is suitable for industrial popularization.

The utility model discloses a zinc oxide lightning arrester convenient to fix and install, which comprises a zinc oxide valve core, the bottom end of the zinc oxide valve core is provided with a stabilizing seat, the bottom end of the stabilizing seat is provided with a connecting rod, the bottom end of the connecting rod is provided with a reverse cone, and the bottom end of the stabilizing seat is sleeved with a stabilizing groove plate. An elastic plate is rotatably mounted at the top end of the pushing disc, a fixed gripper is welded to the top end of the elastic plate, the pushing disc is pushed through a pushing block to enable the elastic plate to slide on the inner side of a sliding groove, and at the moment, the fixed gripper slides on the inner side of the sliding groove, so that the fixed gripper can move out of the inner side of the reverse cone; at the moment, an operator can replace the zinc oxide lightning arrester, automatic locking is performed through a reverse cone and a fixed gripper, the operation steps are simple and convenient, tools carried in high-altitude operation can be reduced, the installation efficiency is improved, the high-altitude operation time is further shortened, and the safety is improved.

The invention discloses ZnO-based voltage-sensitive semiconductor ceramic as well as a preparation method and application thereof, and belongs to the technical field of semiconductor ceramic. The ZnO-based voltage-sensitive semiconductor ceramic provided by the invention is prepared from the following components: ZnO, Bi2O3, MnO2, Co3O4, Cr2O3, Sb2O3, Al (NO3) 3, a disulfide bond organic silicon cross-linking agent, a photothermal conversion agent, a photoinitiator, a dispersing agent and a solvent I. The ZnO-based voltage-sensitive semiconductor ceramic has the characteristics of continuous thickness and uniform components, the voltage gradient and the nonlinear coefficient of the ZnO-based voltage-sensitive semiconductor ceramic are superior to those of a traditional product, the parameter drift rate after surge impact is small, and the ZnO-based voltage-sensitive semiconductor ceramic can be applied to high-end application scenes such as vehicle-mounted chargers of new energy automobiles.

A field grading composite body includes a polymeric matrix (108) and a particulate filler (110) distributed within the polymeric matrix (108). Particles of the particulate filler (110) include a core (114) formed from a semiconductor material, an oxide mixed layer (116) deposited on the core (114), and conducting oxide layer (118). The conducting oxide layer (118) deposited on the oxide mixed layer (116) to provide an electrical percolation path through the polymeric matrix (108) triggered by strength of an electric field extending through the field composite body. Conductors and methods of making field grading composite bodies for conductors are also described.

The invention discloses a preparation method of ZnO-based voltage-sensitive ceramic based on heat treatment assisted cold sintering. The preparation method comprises the following steps: preparing a citric acid solution from deionized water and citric acid; mixing the initial ZnO powder with a metal oxide dopant to form precursor powder, mixing the precursor powder with a citric acid solution, and grinding and dispersing to obtain mixed slurry; putting the mixed slurry into a steel mold, applying pressure, and carrying out cold sintering; and carrying out heat treatment on the cold-sintered sample to finally obtain the high-performance ZnO-based voltage-sensitive ceramic. The ceramic with the relative density as high as 99% is prepared under the condition that the temperature is less than or equal to 950 DEG C, the prepared ceramic also has an excellent nonlinear coefficient as high as 92 and ultrahigh breakdown strength of 1600V / mm, and the ZnO-based piezoresistor prepared by a solid-phase method is far beyond that of a ZnO-based piezoresistor prepared by a solid-phase method. Compared with a traditional high-temperature sintering process, the sintering temperature is reduced, energy is saved, and the electrical performance can be remarkably improved.

The utility model relates to a card sleeve press-fitting device for zinc oxide resistor discs, the press-fitting device comprises a mounting rack and a press-fitting mechanism, the mounting rack provides a mounting position and support for the press-fitting mechanism, the press-fitting mechanism comprises a lower pressing block, an upper pressing block and a press-fitting driving device, the lower pressing block is arranged on the mounting rack, the upper pressing block is arranged on the mounting rack through the press-fitting driving device, and the press-fitting driving device is arranged on the mounting rack. The upper pressing block is located above the lower pressing block, the lower surface of the upper pressing block is parallel and opposite to the upper surface of the lower pressing block, and the press-fitting driving device is used for driving the upper pressing block to move up and down so that the upper pressing block can be close to or away from the lower pressing block. Therefore, the press-fitting device can replace manual work to achieve press-fitting operation of the clamping sleeve, the production efficiency can be improved, the upper pressing block and the lower pressing block can be matched to evenly apply pressure to the resistor disc and the clamping sleeve, compared with manual sleeving, the clamping sleeve is stressed more evenly in the circumferential direction, and therefore even protection on the edge of the resistor disc is achieved, and the service life of the resistor disc is prolonged. And the generation of aluminum deviation of the resistor disc is reduced.

The invention discloses a sintering process and a production process of a zinc oxide ring varistor, a newly purchased sagger is coated with slurry or placed into a sintering furnace for degumming sintering or placed into the sintering furnace for empty sintering after powder scattering and three to ten rounds of treatment, the sagger can be directly placed, coating or powder scattering is not needed, and the sagger can be repeatedly used for at least 30 times; the situation that the ceramic chip is adhered to the inner wall of the sagger is avoided, and yellowing is also avoided; according to the sheet placing mode, the negative influence on blank sheet breakage in the operation process from blank sheet forming to sintering furnace entering is minimized; after the supporting shaft is pulled out, the bunched axial middle shaft through holes are beneficial to thorough glue discharging, the semi-conducting process is benign, and the thoroughness of glue discharging and the consistency of performance are guaranteed; the production efficiency is improved, the production cost is reduced, and meanwhile, resources are fully utilized.

The present invention relates to a zinc oxide varistor and a method for producing a zinc oxide varistor. This zinc oxide varistor comprises a varistor element and multiple electrodes. The varistor element contains zinc oxide as the main component and is formed of a mixture obtained by adding an oxide and lithium fluoride to zinc oxide.

The invention discloses a resistor disc for a lightning arrester and a preparation method of the resistor disc. The resistor disc is prepared from the following components in parts by weight: 80-95 parts of modified zinc oxide, 3-6 parts of bismuth oxide, 1-4 parts of antimony oxide, 1-4 parts of cobalt oxide, 0.6-1.2 parts of nickel oxide, 0.6-1.2 parts of manganese oxide, 0.4-1.0 part of chromium oxide, 0.2-0.6 part of aluminum oxide and 1-4 parts of lead-free glass powder. Through two-step functional modification of the modified zinc oxide, the microstructure and macroscopic performance of the material are remarkably improved, so that the resistor disc has excellent nonlinear coefficient, low leakage current and high energy absorption capability, and the overall technical scheme not only improves the protection performance and service life of the lightning arrester, but also realizes lead-free environmental protection, energy conservation and consumption reduction, and has wide application prospects. And reliable guarantee is provided for safe and stable operation of a power system.

Chip with varistor function, - comprising a zinc oxide varistor layer (VS) - with a multi-layer electrode structure that realizes a varistor function in the varistor layer - with at least two solderable or bondable external contacts (AK) on a first main surface of the varistor layer (VS) - with a glass layer (GS) applied to the first main surface, leaving only the external contacts uncovered - wherein the glass layer comprises as main component oxides of Si and / or Ge, B and K, which in total comprise at least 70 wt.% of the components of the glass layer, - where the content of Al, Ga, Cr and Ti is less than one percent by weight based on the total glass composition.

It enhances the absorption efficiency of infrared rays across a wide wavelength range. [Solution] The infrared sensing element has a temperature sensing layer 22 and an infrared absorbing layer 25 provided separately from the temperature sensing layer 22, which absorbs infrared rays and converts them into heat. The temperature sensing layer 22 and the infrared absorbing layer 25 are thermally connected, and the infrared absorbing layer 25 contains iron oxide.

The utility model discloses a surface-mounted zinc oxide varistor which comprises a voltage-sensitive ceramic chip, surface electrodes and side electrodes positioned on the upper side and the lower side or the lower side of the surface electrodes are arranged on bosses at the two ends of the voltage-sensitive ceramic chip along the length direction, and the side electrodes are used for adhering and positioning solder paste during reflow soldering, can be horizontally laid on a PCB (Printed Circuit Board) and are prevented from rolling. According to the utility model, the bosses at the two ends of the pressure-sensitive ceramic chip increase the distance between the side electrodes and different side surface electrodes to exceed the shortest distance between the two surface electrodes, so that the problems of short distance and pressure-sensitive voltage drop caused by the side electrodes are avoided; and the pressure-sensitive ceramic chip is provided with a boss height interval when being welded on the PCB so as to prevent solder paste from polluting the ceramic body at the lower side edge.

A thermal resistance sensor comprising a substrate, a structure bonded to the substrate, and a niobium oxide layer bonded to the structure.

To suppress the occurrence of cross talk.SOLUTION: A laminated varistor 1 comprises: a sintered body 2; and a first inner electrode E1, a second inner electrode E2, a third inner electrode E3, and a fourth inner electrode E4 that are provided inside the sintered body 2. The first inner electrode E1, the second inner electrode E2, the third inner electrode E3, and the fourth inner electrode E4 are arranged in order of the first inner electrode E1, the third inner electrode E3, the fourth inner electrode E4, and the second inner electrode E2 from a first main surface side. The third inner electrode E3 and the fourth inner electrode E4 are electrically connected each other. In view from a third direction, at least one part of the first inner electrode E1 and at least one part of the third inner electrode E3 are overlapped. In a view of the third direction, at least a part of the second inner electrode E2 and at least a part of the fourth inner electrode E4 are overlapped each other.SELECTED DRAWING: Figure 1

The invention discloses a strain tower lightning arrester mounting structure adaptive to a coastal multi-thunder and typhoon area. The problems that a traditional lightning arrester cannot meet the protection requirement of a strong thunder area and is insufficient in wind load resistance and overturning resistance during mounting are solved. Wherein the lightning arrester comprises a lightning arrester body and a fixed base, the lightning arrester body is fixed on a strain tower body support through the fixed base, and a set distance is arranged between the lightning arrester body and a strain insulator; the fixed base is provided with a lightning arrester position adjusting structure which is used for adjusting the mounting position of the lightning arrester; the lightning arrester is reinforced by a double-insulator cable-stayed supporting assembly, the double-insulator cable-stayed supporting assembly comprises two cable-stayed insulators, the inclined lower ends of the cable-stayed insulators are connected with the lightning arrester, and the inclined upper ends of the cable-stayed insulators are connected with the tension tower body support.

The invention relates to a pressure-sensitive electrode, a pressure-sensitive resistor assembly and a surge protection device, and belongs to the technical field of pressure-sensitive resistors. The surge protection device comprises a piezoresistor assembly, the piezoresistor assembly comprises a voltage-sensitive electrode, the voltage-sensitive electrode comprises an electrode body and a welding boss, the welding boss is arranged on the connecting side of the electrode body, the connecting side of the electrode body is provided with a first blocking groove, and the first blocking groove blocks the periphery of the welding boss in partial or all directions. According to the pressure-sensitive electrode, the pressure-sensitive resistor assembly and the surge protection device provided by the invention, the connecting side of the electrode body is attached to the gasket, the invasion interval is formed between the connecting side of the electrode body and the gasket, and in the invasion interval, the direction from the welding boss to the edge of the electrode body is the invasion direction; the first blocking groove can block a capillary phenomenon water absorption path of liquid water in the invasion direction. Through the arrangement, moisture can be effectively prevented from flowing to the edge of the ceramic of the piezoresistor along the surface of the electrode body, and the piezoresistor is prevented from being affected with damp and being short-circuited and invalid.

A solid dielectric surge arrester includes a hermetically sealed composite encased module assembly. The module assembly includes at least one metal oxide varistor (MOV) block with an outer circumferential surface, and a material applied to the outer circumferential surface. The material includes multiple layers to allow the module assembly to withstand a bending moment under long term cyclic load and short term rated bending load, the material is configured to improved bending strengths, and provide safe short circuit failure mode venting in a preferential direction or directions.

A multilayer varistor includes a sintered body, an internal electrode disposed in the sintered body, a high-resistance layer covering at least part of the sintered body, and an external electrode covering part of the high-resistance layer, the external electrode being electrically connected to the internal electrode. An arithmetic mean roughness of a surface of the high-resistance layer is greater than or equal to 0.06 μm.