127results 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.

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 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 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.

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 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.

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.

The invention provides a design method and system for a high-gradient power transmission line lightning arrester. The design method comprises the steps that the minimum through-flow capacity needed by the lightning arrester is calculated according to the voltage grade of a power transmission line and the lightning environment where the power transmission line is located; calculating a through-current capability margin when the high-gradient zinc oxide resistor disc independently forms a resistor disc core body by taking the minimum through-current capacity as a constraint, and further determining the composition of the lightning arrester resistor disc; designing an internal mechanical structure of the lightning arrester on the basis of determining the composition of the resistor disc of the lightning arrester; and designing an insulation height and a creepage distance, and determining the umbrella skirt structure of the lightning arrester. The lightning arrester resistor disc composition designed by the application gives consideration to the characteristics of high gradient and large through-flow of the lightning arrester, the designed internal mechanical structure reduces the internal contact resistance of the lightning arrester body and improves the overall through-flow capability, heat dissipation effect and sealing performance, and the designed lightning arrester umbrella skirt structure reduces the size of the lightning arrester and reduces the cost. And high reliability, large through-flow capacity and excellent external insulation performance are realized.

The invention discloses a line lightning arrester, and relates to the technical field of power system lightning protection, the line lightning arrester comprises a lightning arrester body, a hinge fixing base and an electric control separation device, the lightning arrester body comprises a first lightning protection unit and a second lightning protection unit which are connected in series, and the bottom end of the first lightning protection unit is hinged to the hinge fixing base; the electric control disconnecting device comprises a thermal explosion disconnector and a leakage current monitoring module, the thermal explosion disconnector is connected with the first lightning protection unit and the second lightning protection unit, and the leakage current monitoring module is used for collecting the leakage current value of the first lightning protection unit in real time; under the condition that the leakage current value of the first lightning protection unit exceeds a preset action current threshold value, the leakage current monitoring module controls the thermal explosion disconnector to trigger a disengagement action, so that the top end of the first lightning protection unit is separated from the second lightning protection unit, and then the first lightning protection unit can rotate towards the ground around the hinged fixed base under the action of self weight; therefore, the first lightning protection unit and the second lightning protection unit are reliably separated, and timely separation of the fault lightning arrester is realized.

Provided is a zinc oxide element which does not contain antimony oxide and has good nonlinear resistance characteristics (V10 kA / V1 mA nonlinearity) by controlling the particle size of zinc oxide particles in a sintered body. The zinc oxide element of the present invention includes a fired body containing zinc oxide, bismuth oxide, and zinc stannate (Zn2SnO4). A method for producing a zinc oxide element of the present invention includes firing a raw material oxide that contains zinc oxide, bismuth oxide, and tin oxide and does not contain antimony oxide, and segregating zinc stannate (Zn2SnO4) at grain boundaries of the fired zinc oxide.

This invention discloses a heat-absorbing layer for a metal oxide varistor. A thermally protected metal oxide varistor (TMOV) device includes: an MOV chip; a first electrode disposed on a first side of the MOV chip; a second electrode disposed on a second side of the MOV chip opposite to the first side; a conductive first lead connected to the first electrode; a heat-absorbing layer bonded to the second electrode by a heat-absorbing paste formed from a mixture of silica sand, melamine cyanurate, and silicone resin, wherein the heat-absorbing paste is formed from a mixture of melamine cyanurate and silicone resin; a thermal cutoff (TCO) element extending through pores in the heat-absorbing layer and having a first end electrically connected to the second electrode by a certain amount of solder having a melting temperature lower than the melting temperature of the TCO element; and a conductive second lead electrically connected to the second end of the TCO element.

The invention discloses a ZnO varistor uniformly doped with Y element and a sol-gel preparation method of the ZnO varistor, and belongs to the technical field of electronic ceramic materials. The preparation method comprises the following steps: (1) preparing a resistor raw material containing Y (NO3) 36H2O; (2) adding a citric acid solution into the yttrium nitrate solution to adjust the pH value to 3.0-5.0, adding polyethylene glycol, and performing ultrasonic treatment to obtain a precursor solution; (3) dropwise adding ammonia water, and pouring the Bi2O3 powder to form sol wrapping Bi2O3; (4) standing and aging to form wet gel wrapping Bi2O3 powder; (5) drying and calcining; (6) preparing total slurry; (7) preparing a green body; and (8) sintering to obtain the ZnO piezoresistor uniformly doped with the Y element. According to the preparation method, a sol-gel method is adopted, a citric acid complexing system is combined with polyethylene glycol, and the technical bottlenecks that in a traditional process, Y elements are prone to agglomeration, and the grain sizes are not uniform are solved through pH value gradient regulation and an ultrasonic dispersion process.

The utility model relates to the technical field of lightning arresters, in particular to a totally-enclosed 10kV outdoor zinc oxide lightning arrester with a joint, which comprises a rod body, a transformer arranged on the rod body, a fuse electrically connected with the transformer and a lightning arrester electrically connected with the fuse, the lightning arrester comprises a silicon rubber umbrella skirt, a wiring hole formed in the silicon rubber umbrella skirt, a valve plate arranged in the silicon rubber umbrella skirt and a zinc oxide layer arranged on the valve plate, and the zinc oxide layer is arranged on the outer side of the valve plate in a sleeving mode. According to the utility model, the series discharge gap of the traditional lightning arrester is effectively replaced, the discharge and recovery functions are realized by using the nonlinear volt-ampere characteristic of the zinc oxide valve plate, the structure is compact, the design is reasonable, and the working performance of the lightning arrester is improved.

The application discloses a high-voltage large-current zinc oxide varistor disc and a preparation method and application thereof, and belongs to the technical field of overvoltage protection devices. 3 The zinc oxide varistor disc is composed of the following raw materials in percentage by weight: 95.0-97.5% of ZnO, 0.5-1.2% of Bi2O 3 0.8-1.5% of Sb2O 3 0.2-0.5% of Co2O 2 0.3-0.6% of MnO 3 0.1-0.3% of Cr2O 3 0.01-0.05% of Al2O 3 0.1-0.4% of SiO2 and 0.05-0.2% of a rare earth dopant RE2O The non-working surface of the zinc oxide varistor disc is sprayed with modified epoxy resin insulating paint, and the modified epoxy resin insulating paint is prepared by mixing tetrahydroxy octaphenyl double-layer cage-type silsesquioxane solution, epoxy resin, fillers and a curing agent. The zinc oxide varistor disc has a residual voltage ratio of less than or equal to 1.8, a voltage nonlinearity coefficient alpha of more than or equal to 50, and a performance attenuation rate of less than or equal to 5% after 1000 hours of aging at 150 DEG C under a 250kA 8 / 20 mu s impulse current, is excellent in electrical performance and weather resistance, and can meet the overvoltage protection requirements of extra-high-voltage and large-capacity power systems.

Provided are a composite device for automotive electric parts and a manufacturing method thereof. The composite device includes: a multi-layered ceramic capacitor having a plurality of first and second internal electrodes alternately arranged; a multi-layered ceramic varistor having a plurality of third and fourth internal electrodes arranged to face each other, the multi-layered ceramic varistor being stacked on one side surface of the multi-layered ceramic capacitor; an adhesive layer made of an insulating heat dissipation ceramic adhesive for bonding the multi-layered ceramic capacitor and the multi-layered ceramic varistor; and first and second external electrodes which connect the plurality of first and second internal electrodes exposed to both end portions of the multi-layered ceramic capacitor with the plurality of third and fourth internal electrodes exposed to both end portions of the multi-layered ceramic varistor, respectively.

The present invention provides a ring varistor for use in DC micromotor including a ring varistor substrate having nonlinear volt-ampere characteristics and at least three independent electrodes evenly sintered on an end face of the ring varistor substrate. The electrode gap between two adjacent electrodes consists of two straight parallel edges of the two adjacent electrodes, and an inner and an outer concentric arc on the substrate ring, the electrode gap is not orthogonal to the ring. Due to the asymmetry arrangement of the surface electrodes and the electrode gaps, the electrode materials and the substrate materials with different thermal conductivity have no contact cross distribution with each other at the radial electrode gap. During welding, the heat shock is transmitted asymmetrically through the asymmetric electrodes, to improve the uniformity of the heat conduction distribution of the varistor and reduce the defective rate of the substrate welding fracture.

The application relates to the technical field of zinc oxide arresters, and discloses a zinc oxide arrester with a self-repairing function, which comprises a base and an arrester body, the base is provided with cross arm mounting racks on both sides, the top end of the base is provided with a heat dissipation shell, the heat dissipation shell is internally provided with an anti-interference shell, and heat-absorbing insulation partition plates are arranged between the inner walls of the anti-interference shell. The application realizes self-energy supply of the system, does not need an external power supply, provides opposite driving force through a reverse pulse electric field generated by a pulse generator, forces the migrated ions to return to the original position or a more stable state, integrates four functions of monitoring, diagnosing, energy taking and activating in a compact system, realizes real intelligentization, on-line type, self-energy supply and self-repairing function, the coupling capacitor plays a protection role, the repair liquid can independently and self-repair the cracked valve body, can be repaired for multiple times, and does not affect the electrical performance.

The present disclosure addresses the problem of realizing a favorable and stable ESD suppression effect and tolerance against abnormal voltage and DC voltage. A surge-absorbing element (1) comprises: an element body (11) having a pair of end surfaces facing each other and a plurality of lateral surfaces adjacent to the end surfaces; at least a pair of internal electrodes (13) provided inside the element body; and at least a pair of external electrodes that are provided on the end surfaces and that are electrically connected to the internal electrodes (13). The element body (11) has: a function part (12) having a polycrystal structure composed of a plurality of crystal particles exhibiting voltage non-linearity and having voids; and an outer shell part for covering the function part. The internal electrodes (13) are provided so as to face each other with the function part (12) interposed therebetween. The external electrodes include: at least a pair of primary external electrodes (14) provided on the end surfaces; and at least a pair of secondary external electrodes (15) provided on the primary external electrodes (14) and electrically connected thereto. The elastic modulus of the secondary external electrodes (15) is lower than that of the primary external electrodes (14).

The invention relates to a multi-layer varistor (1) comprising a ceramic body (2) having a large number of inner electrodes (5), the ceramic body (2) comprising an active region (3) and a near-surface region (4), and the ceramic body (2) comprising at least one first ceramic material (6) and at least one second ceramic material (7), the ceramic materials (6, 7) differing in a concentration of monovalent elements X+, where X+ = Li+, Na+, K+ or Ag+. The invention further relates to a method for producing a multi-layer varistor (1).

To provide a varistor that can improve electrical characteristics. [Solution] The varistor 1 comprises a ceramic body 11 containing zinc oxide and an oxide of at least one element selected from bismuth, praseodymium, and strontium, an internal electrode 12 disposed inside the ceramic body 11, and an insulating layer 13 disposed to cover the ceramic body 11. * a * b * In the color system, the chromaticity b of the surface S of the insulating layer 13 * However, b * >0

The application discloses a kind of sodium-containing ZnO varistors and preparation method thereof, belong to electrical material technical field.The raw material formula of the varistor:ZnO, Bi2O3, Sb2O3, NiO, Cr2O3, Mn3O4, Co3O4, SiO2, NaBiO3.Preparation, Bi2O3, NaBiO3 First mixed and kept at 500-600 ℃ for 0.5-2h, make Bi2O3 powder and NaBiO3 Powder partially melt together, after cooling, crush and add other raw materials and Al (NO3) 3·9H2O, dispersing agent, binder and deionized water to obtain total slurry;After granulation, compression molding, sintering, form stable resistor piece blank;The application is introduced NaBiO3 in ZnO varistor, and NaBiO3 Can be decomposed and release sodium ion in sintering process, these sodium ions help to improve the electrical properties and stability of resistor piece.

An arrester including a metal oxide varistor (MOV) disc and a spark gap assembly electrically connected in series with the MOV disc. The spark gap assembly includes a spark gap and a frequency-dependent grading capacitor electrically connected in parallel with the spark gap.

To provide a multilayer varistor capable of suppressing the occurrence of migration.SOLUTION: A multilayer varistor 1 includes a sintered body 11, a first internal electrode 12A, a second internal electrode 12B, a first external electrode 14A, a second external electrode 14B, and a high resistance layer 13. The first internal electrode 12A and the second internal electrode 12B are provided inside the sintered body 11. The first external electrode 14A is provided onto the surface of the sintered body 11 and is electrically connected to the first internal electrode 12A. The second external electrode 14B is provided to the surface of the sintered body 11 and is electrically connected to the second internal electrode 12B. The high resistance layer 13 covers at least part of the surface of the sintered body 11, and the high resistance layer 13 has multiple cracks on the surface.SELECTED DRAWING: Figure 1

A thermo-resistive sensor, including: a substrate; a structure coupled to the substrate; and a layer of niobium oxide coupled to the structure.