175 results about "Dielectric strength" patented technology

The invention discloses a power module packaging structure. According to the chip, a non-linear conductive material coating is arranged at the connecting part of the edge of each metal bonding pad and a chip substrate, and the connecting part of the edge of each metal bonding pad and the chip substrate is the joint of the metal bonding pad, the chip substrate and an insulating encapsulating material, namely the three-phase point. Through the arrangement of the non-linear conductive material coating, the resistivity is high in a normal low field, and electric leakage is prevented; and when the local electric field intensity is increased sharply (terminal at the three-phase junction), the resistivity is reduced sharply, the electric field is uniformly dispersed, and the peak of the local electric field is inhibited, so that the overall dielectric strength and creepage distance of the module are improved. According to the technical scheme, the insulation reliability of the power module under high-voltage, high-frequency and high-temperature working conditions is remarkably improved, particularly, partial discharge is restrained at a three-phase point, the service life of the module is prolonged, and the production and maintenance cost is reduced.

The invention discloses a production method of a sintered neodymium-iron-boron spliced magnet. The method comprises the following steps: processing a magnet to a predetermined size, cleaning and drying; dissolving solid epoxy resin, a solid latent curing agent and an accelerant by using an organic solvent to prepare an impregnating adhesive; gluing the two sides of the glass fiber cloth, and fully volatilizing a solvent to obtain pre-impregnated glass fiber cloth; after being cut, the magnetic blocks are inserted between the to-be-spliced magnets; and after being clamped by a clamp, the insulating adhesive layer is heated and cured to form a compact and pore-free insulating adhesive layer. According to the invention, air holes of the adhesive layer are thoroughly eliminated through a prepreg process, the formed insulating adhesive layer has excellent dielectric strength and insulativity, adjacent magnets can be effectively isolated, an eddy current channel can be effectively cut off, the eddy current heating problem in high-frequency application is remarkably reduced, and meanwhile, high strength and high reliability of the spliced magnet are ensured. The method is particularly suitable for the fields of motors and the like needing to reduce eddy-current loss.

The invention discloses a composite material polypropylene film and a preparation method thereof, and belongs to the technical field of polymer modification and polymer films. The preparation method of the composite material polypropylene film comprises the following steps: blending 5-10 wt% of maleic anhydride grafted polypropylene (PP-g-MAH), 5-20 wt% of a cycloolefin copolymer or a cyclic block copolymer and 75-90 wt% of isotactic polypropylene, granulating, carrying out melt extrusion at 240-260 DEG C, and carrying out tape casting at 80-95 DEG C to form a sheet; preheating the sheet at the temperature of 145-170 DEG C, synchronously stretching at the temperature of 150-175 DEG C, carrying out heat setting at the temperature of 160-175 DEG C, and cooling; the composite material polypropylene film is prepared through the steps of extrusion, traction, corona treatment, rolling and the like. The composite material polypropylene film not only has good heat resistance and good dielectric strength at a high temperature, but also has a relatively high dielectric constant and relatively low dielectric loss, and is suitable for a film capacitor.

The invention relates to the technical field of testing equipment, and particularly discloses an insulating oil dielectric strength testing device which comprises a dustproof detection box, one side of the dustproof detection box penetrates through and is fixedly connected with an observation window, the top of the dustproof detection box is fixedly connected with a dehydration device, and the bottom of the inner wall of the dustproof detection box is fixedly connected with a first supporting seat. The bottom of the testing oil cup is communicated with an oil outlet pipe, the bottom of the testing oil cup penetrates through and is rotationally connected with a cleaning device, the parts, located on the two sides of the testing oil cup, of the bottom of the inner wall of the dustproof detection box are fixedly connected with impurity removing devices, and the parts, located on the two sides of the testing oil cup, of the bottom of the inner wall of the dustproof detection box are fixedly connected with distance adjusting devices; the dielectric strength testing device for the insulating oil is provided with the dehydration device, so that the dielectric strength of the insulating oil is prevented from being reduced due to the existence of water, the accuracy of a test result is improved, and the impurity removal device is arranged, so that the test result is prevented from being influenced by impurities or generated foam in the insulating oil.

To provide a semiconductor device capable of improving the dielectric strength between a polysilicon wiring and a semiconductor substrate.SOLUTION: The semiconductor element (DEV1, DEV2) includes a semiconductor element substrate (SUB), a first insulating film (IF1, IF4), a second insulating film (IF2, IF5), a third insulating film (IF3, IF6), and a polysilicon wire (PW1,). PW2. The substrate has a first F1 and a first lower F2 opposite to the first upper surface. The first upper surface has a trench (side TR1, TR2) extending toward the first lower surface. The first insulating film is formed in the trench. The third insulating film is formed above the first insulating film so as to cover an upper surface of the second insulating film. The polysilicon wiring is formed on the third insulating film and electrically insulated from the semiconductor substrate by at least the second insulating film and the third insulating film.SELECTED DRAWING: Figure 1

The invention relates to the technical field of material sealing, in particular to a high-performance insulating ceramic sealing method for a neutron tube, which comprises the following steps: sequentially carrying out organic solvent ultrasonic cleaning and argon plasma etching activation treatment on a sealing surface of a cylindrical high-purity aluminum oxide ceramic piece, and depositing a titanium transition layer through magnetron sputtering, the ceramic piece with the titanium transition layer is obtained; the sealing face of the kovar alloy cylindrical flange plate is subjected to acid pickling, an oxide layer is removed, cleaning and drying are conducted, and a metal sealing part is obtained; preparing an active brazing filler metal sheet; the components are assembled in sequence to form a pre-assembled component; the pre-assembled component is placed in a vacuum brazing furnace, axial pre-tightening force is applied to the pre-assembled component, sealing is completed, then cooling is controlled, and a sealing piece with an airtight brazing joint is formed; and carrying out annealing treatment to obtain a finished product sealing assembly. Therefore, the problems of low dielectric strength, large thermal expansion coefficient difference, difficulty in interface quality control and the like in the prior art are solved.

The invention relates to porous ceramic for a high-air-permeability semiconductor device as well as a preparation method and application of the porous ceramic, raw materials comprise 35-55 wt% of alumina powder and 10-55 wt% of a polymer microsphere pore-forming agent, and the polymer microsphere pore-forming agent comprises one or more of agarose, polylactic acid, polyacrylamide and organic silicon resin. The porous ceramic for the high-air-permeability semiconductor device, which is obtained by the preparation method provided by the invention, has relatively high porosity and air permeability, and also has relatively high mechanical strength and dielectric strength. According to the present invention, the gas volume flow rate is applied to the internal pore size characterization, and the high porosity and the high gas permeability can be achieved by accurately measuring the gas flow transmittance, accurately characterizing the pore size and the opening degree in the porous ceramic, and adjusting the particle size and the addition amount of the polymer microsphere pore forming agent; through the preparation process, the porosity and mechanical strength of the porous ceramic for the high-air-permeability semiconductor device can be balanced, meanwhile, high air permeability and high compressive strength are obtained, and the porous ceramic is particularly suitable for electrostatic chucks of different manufacture procedures.

Described herein are isolator devices designed to reduce cracking and mechanical stress despite the use of wire bonds made of hard materials (e.g., copper-based). The isolators employ thin film dielectric materials with high dielectric strength and permittivity underneath the top coil (electrode) to enhance the isolation of the device. However, these materials are susceptible to cracking. Described herein are designs in which the dielectric material is partially removed from the isolator. A dielectric layer may be kept in the region(s) where its large dielectric permittivity is particularly beneficial (e.g., near the edge of a coil) but may be removed from the region immediately underneath the bonding pad, where a large amount of pressure is applied during the bonding process. Optionally, a cushion layer is employed to absorb some of the energy produced during the bonding process.

This invention discloses an insulating product withstand voltage testing device, comprising an iron frame, a support device, and a lifting device. The iron frame consists of two vertical rods and a horizontal rod connecting the two vertical rods. The two vertical rods are arranged opposite each other, and the horizontal rod is fixedly connected between the tops of the two vertical rods. The support device includes a retractable horizontal plate fixed to the vertical rods. The horizontal plate extends to directly above an insulating oil tank, and its end extending above the insulating oil tank has a groove for supporting an insulator. After the retractable horizontal plate of the support device extends to directly above the insulating oil tank, the matching groove at its end can stably support the insulator without requiring the operator to hold it continuously. The lifting device, through the cooperation of a pull cable, pulleys, and clamping components, can easily realize the lifting and lowering movement of the insulator. The operator only needs to pull the pull cable to complete the lifting and lowering operation of the insulator, greatly reducing physical exertion and improving the overall ease of operation.

The present disclosure aims to provide hexagonal boron nitride powder, etc., for obtaining a resin composition that achieves both excellent thermal conductivity and dielectric strength. A hexagonal boron nitride powder according to one aspect of the present disclosure is a hexagonal boron nitride powder containing hexagonal boron nitride aggregates (101), characterized in that the average particle size is 25 μm or more and 70 μm or less, the cumulative frequency of particle size of 40 μm or more in the volume-based particle size distribution is 65% or more, the tap bulk density is 0.84 g / mL or more and 1.05 g / mL or less, and the oil absorption is 50 mL / 100 g or more and 84 mL / 100 g or less.

The present invention relates to a single-crystalline Al2O3 dielectric compatible with two-dimensional materials and an integrated device thereof. A single-crystalline Al thin film is produced on a single-crystalline graphene / germanium (110) substrate via the van der Waals (vdW) epitaxy approach, the single-crystalline Al thin film is peeled off from the graphene / germanium substrate, and intercalative oxidation is performed to produce the single-crystalline Al2O3 dielectric compatible with two-dimensional materials on the lower surface of the single-crystalline Al thin film. The gate leakage current (J<1×10−5 A cm−2), interface state density (Dit=8.4×109 cm−2 eV−1), and dielectric strength (Ebd=17.4 MV / cm) of the single-crystalline Al2O3 dielectric obtained in the present invention can meet the requirements of the international roadmap for devices and systems (IRDS) for low power consumption devices.

This invention discloses a method for preparing a novel ultra-high voltage high-performance composite insulating material, belonging to the field of composite insulating material preparation technology. The technical solution includes the following steps: S1, preparing a modified epoxy-silicone rubber composite resin matrix: 40-50 parts by weight of bisphenol A type epoxy resin (E-51) are placed in a reaction vessel, heated to 60-70℃, and continuously stirred at a stirring rate of 300-500 r / min. 10-15 parts by weight of terminal hydroxyl polysiloxane (molecular weight 5000-10000) are added, and the temperature is kept constant for 1.5-2 hours; subsequently, the system temperature is lowered to 40-50℃. The beneficial effects of this invention are: by setting up a resin matrix system of "terminated hydroxyl polysiloxane modified epoxy resin + nano-alumina / boron nitride composite reinforcement," the problem of imbalance between high voltage resistance and aging resistance in existing materials is solved. It exhibits significantly improved dielectric strength, greatly reduced dielectric loss, and excellent high and low temperature cycling performance, meeting the long-life operation requirements of ultra-high voltage equipment.

The invention discloses a preparation method and application of a tensile mica tape based on polyimide film dielectric reinforcement, and relates to the technical field of mica tape preparation. The invention aims to solve the problem of low dielectric strength of the traditional main insulation mica tape of the offshore high-voltage wind driven generator. The method comprises the following steps: bonding the mica paper and the polyimide film, or bonding the mica paper, the polyimide film and the glass wool cloth, and then carrying out hot pressing and curing to obtain the polyimide film dielectric reinforcement-based tensile mica tape. The tensile mica tape based on polyimide film dielectric reinforcement is applied to a main insulating material of a stator bar of an offshore high-voltage wind driven generator. The invention can obtain the preparation method and application of the tensile mica tape based on dielectric reinforcement of the polyimide film.

The utility model belongs to the technical field of insulating oil detection, and discloses an insulating oil dielectric strength testing device which comprises a rack and a detection assembly arranged in the rack, and the detection assembly comprises a sealing vessel used for containing insulating oil and a detection unit used for dielectric strength detection; the motor is arranged on the rack; the clamping arm is used for clamping a vessel, and the clamping arm is fixedly connected with the output end of the motor; the air inlet valve is communicated with the vessel through a pipeline; the exhaust valve is communicated with the vessel through a pipeline; the nitrogen cylinder is communicated with the air inlet valve through a pipeline; according to the scheme, insulating oil is introduced into the vessel in an inclined mode, air in the vessel is replaced, the oxidation influence of oxygen and moisture on oil quality is reduced, and therefore abnormal discharge and data deviation caused by bubbles are reduced; the utility model solves the problem that the existing dielectric strength vessel is easy to cause bubbles to be mixed into the insulating oil.

The invention discloses hexagonal boron nitride and a preparation method thereof, and belongs to the technical field of hexagonal boron nitride.The preparation method comprises the steps that a nitrogen source and a boron source are dried and mixed and pressed to obtain a densified green body, a densified precursor is prepared, boron nitride sintered blocks are prepared, and the hexagonal boron nitride is obtained through crushing, sieving, acid pickling and drying. The hexagonal boron nitride crystal prepared by the invention has excellent quality, remarkable anisotropic heat conduction characteristic, high dielectric strength and stable insulating property in a wide temperature range, can still keep an excellent insulating level even in a high-temperature environment, and can fully meet the performance requirements of scenes such as high-end electronic packaging and high-temperature devices; due to the self-lubricating property caused by low hardness, the application potential in the fields of high-temperature bearings, release agents and the like is expanded.

A method for controlled switching of a switching device is described. In one example, a rate of decrease of a first dielectric strength (RDDS) value and a second RDDS value is determined. Once determined, the first RDDS value is compared to an absolute peak value of a gap voltage. If the first RDDS value is less than the absolute peak value of any one of a plurality of half cycles of the gap voltage, switching of the switching device at a second time can be performed. To this end, the second time is an offset relative to a first time such that the absolute peak value of the gap voltage does not intersect a range defined by the first RDDS value and the second RDDS value.

The invention relates to the field of multi-layer composite nano-doped fibers and the field of high-flame-retardant insulating thin film materials, in particular to a multi-layer composite nano-doped high-flame-retardant insulating thin film material and a preparation method of the multi-layer composite nano-doped high-flame-retardant insulating thin film material. According to the invention, the electrical and flame retardant properties are improved by doping the functional filler, the power frequency dielectric strength reaches 18.4-22.6 kV / mm, the limit oxygen index is increased to 32%-38%, the temperature resistance grade reaches C grade, the flame retardant property is improved, the flame retardant property is improved, the flame retardant property is improved, the flame retardant property is improved, the service life is prolonged, and the service life is prolonged. The insulating material is obviously superior to conventional polyester and other insulating materials. The prepared multi-layer composite nano-doped high-flame-retardant insulating film material has the performance advantages of light weight, flexibility, high strength, flame retardance, insulation, corona resistance, high temperature resistance and the like, the process is simple, large-scale preparation can be achieved, and the multi-layer composite nano-doped high-flame-retardant insulating film material is suitable for meeting the high-end electrical insulation requirements of high-speed rails, new energy automobile power batteries, high-voltage cables, aerospace electrical systems and the like.

The invention relates to the technical field of preparation of electronic components, and particularly discloses lead-free composite glass powder for side insulation of a resistor disc and a preparation method of the lead-free composite glass powder. The lead-free composite glass powder for side insulation of the resistor disc comprises the following raw materials in parts by weight: 90-110 parts of matrix glass powder and 10-30 parts of functional filler, and the matrix glass powder is vanadate-molybdate series lead-free glass. The lead-free composite glass powder is provided for the side face of the resistor disc, a compact insulating layer is formed after sintering, and the resistor disc has the advantages of being good in dielectric strength and good in durability.

The invention discloses a resonance network for suppressing transient recovery voltage of a circuit breaker, and belongs to the technical field of high-voltage alternating-current circuit breaker switching-on and switching-off. The resonance network is composed of a metal oxide arrester and N resonance branches with the same structure. The number N of the resonant branches and the resonant frequencies of the resonant branches are obtained through an electromagnetic transient simulation model; the resonant frequency presents low impedance near the transient recovery voltage fundamental frequency, a shunt and energy consumption path is provided for the high-frequency oscillation current, and active suppression of the rising gradient and the oscillation amplitude of the transient recovery voltage is achieved. The metal oxide lightning arrester is used as backup protection, and clamps the transient recovery voltage peak value when the suppression effect of the resonance branch is insufficient or abnormal. The resonant network can significantly suppress the rise rate and amplitude of transient recovery voltage under a high voltage level in a medium strength recovery critical period, effectively improves the on-off reliability of the vacuum circuit breaker, and has good working condition adaptability and system safety.

The invention relates to the technical field of high-voltage automobile wire insulating materials, in particular to a manufacturing method of an automobile wire insulating layer and a combined wire, and aims to solve the problems that in the prior art, a traditional crosslinked polyethylene material is insufficient in breakdown voltage in an extremely thin wall state, and the interface adhesive force is remarkably reduced after damp-heat aging; and although ceramic silicone rubber has high dielectric strength, the material density is too high, the flexibility is poor, and the requirements of light weight and bending resistance cannot be met. Through the synergistic effect of the gradient cross-linked structure and the axially and directionally arranged nano boron nitride sheet layers, the breakdown voltage is increased while the mechanical strength of the thin-wall insulating layer is ensured, and the interface bonding force is enhanced in combination with the molecular anchoring layer; the method has the advantages that the breakdown strength of the insulating layer is improved, the conductor-insulating layer interface bonding force is enhanced, and a lightweight thin-wall structure is realized.

The invention relates to the field of cable voltage withstanding testing, in particular to a power cable voltage withstanding testing method, which comprises the following steps of: defining a scanning interval in combination with total capacitance of a cable and historical resonance data of the same type of cable in a three-stage resonance point searching mode of coarse scanning positioning of a candidate interval, fine scanning of refined data and secondary interpolation calibration; the problem of low efficiency of all-interval precise scanning is solved, and the defect of insufficient precision of empirical estimation can also be made up. According to the invention, the voltage compensation coefficient and the boost rate compensation value are respectively calculated based on the ground temperature and humidity environmental parameters of the test site, the dynamic correction of the test voltage and the boost rate is realized, and the influence of temperature and humidity on the cable insulation dielectric strength can be eliminated. According to the method, a mode of correlation analysis of discharge sound and current data is constructed in a boost stage, a defect area is positioned through a decibel attenuation trend, insulation abnormity is verified in combination with current fluctuation correlation, and a defect range is accurately narrowed to a single monitoring point interval or an adjacent monitoring point interval.

The application relates to the technical field of cables, and discloses a high-strength aluminum alloy medium-voltage power cable. The high-strength aluminum alloy medium-voltage power cable comprises, from inside to outside, an aluminum alloy conductor and an insulation layer; the insulation layer is a cross-linked polyethylene nano-composite insulation material, and the raw material components of the cross-linked polyethylene nano-composite insulation material comprise, in terms of weight fractions, 100 parts of a base resin, 3-8 parts of core-shell-star compounded inorganic nano-filler, 0.5-1 part of an antioxidant and 1.5-2.5 parts of a cross-linking agent; the core-shell-star compounded inorganic nano-filler is silica-coated nano-aluminum nitride grafted with polyhedral oligomeric silsesquioxane, and is denoted as AlN@SiO2-POSS. In the application, the inorganic nano-composite filler is used to improve the thermal conductivity of the cable insulation layer, and meanwhile, the dielectric strength, mechanical tensile property and heat aging resistance of the cable are improved.

This invention discloses a dynamic arc simulation method and related system for disconnecting switches considering contact movement, belonging to the field of high-voltage electrical equipment simulation technology. First, a three-dimensional geometric model of the disconnecting switch is constructed based on actual dimensional parameters. This model is then imported into simulation software to simulate the movement of the moving arc-initiating contact and obtain the dielectric strength recovery curve. Next, an electromagnetic simulation circuit considering arc reignition is constructed to simulate the dynamic arc-ignition process and obtain the voltage difference and current across the disconnecting switch. By combining the voltage difference, current, and dielectric strength recovery curve, the arc-extinguishing or arc-ignition state is determined, and the electromagnetic simulation circuit is controlled accordingly to achieve closed-loop simulation of the alternating arc-extinguishing state of the disconnecting switch. This invention innovatively couples the contact movement characteristics with the physical process of the arc, solving the simulation error problem caused by the simplified dielectric strength curve in traditional methods. It can accurately predict the transient overvoltage characteristics of disconnecting switch operation, providing a reliable analytical means for the insulation design of ultra-high voltage equipment.

A sensor device for monitoring dielectric strength of a dielectric fluid has a sensor body which supports a sensitive part (SGi), designed for contact with the dielectric fluid. The sensitive part (SGi) comprises at least one pair of electrodes (E1, E2) having respective surface portions arranged at a predefined micrometric or sub-micrometric distance, to define therebetween at least one detection gap between which part of the dielectric fluid is suitable to seep in. The sensor device has a circuit arrangement comprising: —means for generating an electric field between the two electrodes of the at least one pair of electrodes (E1, E2) starting from a known supply voltage, and—means (V) for measuring a voltage representative of possible occurrence of an electric discharge between the two electrodes of the at least one pair of electrodes (E1, E2) through the dielectric fluid (5) present in the at least one detection gap (G), following generation of the electric field.

This utility model belongs to the field of electronic transformer technology, specifically relating to a compact high-frequency electronic transformer with high dielectric strength. It includes a mounting frame with pins mounted near both ends on the bottom surface of the frame. A partition is provided on the upper side of the mounting frame, and a winding frame is fixedly connected to the upper and lower sidewalls of the partition. The winding frame is fixedly connected to the mounting frame and has a hollow structure. A primary coil is mounted inside the winding frame on the upper side of the partition, and a secondary coil is mounted inside the winding frame on the lower side of the partition. An upper magnetic core is mounted on the upper side of the winding frame, and a lower magnetic core is mounted inside the winding frame on the lower side of the mounting frame. A dielectric protection cover is mounted on the outer side of the winding frame between the upper and lower magnetic cores. The bottom and left sidewall of the dielectric protection cover are open. This utility model eliminates the need for insulating tape, can withstand high voltage and arc damage, and significantly reduces the transformer size.

The utility model discloses a high-voltage switching-on and switching-off device for an insulation voltage-withstanding dielectric strength test, and the device comprises a rotating disc which is rotatably arranged; the metal guide rod is arranged on the turntable and rotates along with the turntable, and contact terminals are arranged at the two ends of the metal guide rod; a first high-voltage positive input terminal and a first high-voltage negative input terminal, wherein a first high-voltage load resistance network is arranged between the first high-voltage positive input terminal and the first high-voltage negative input terminal; and a second high-voltage positive input terminal and a second high-voltage negative input terminal, and a second high-voltage load resistance network is arranged between the second high-voltage positive input terminal and the second high-voltage negative input terminal. According to the utility model, the appropriate resistance load network can be selected according to the input voltage to rapidly divide and adapt the load, and the flexibility, accuracy and safety of the insulation voltage-withstanding dielectric strength test are improved.

The invention discloses a dielectric hydrophobic film layer and a preparation method and application thereof, the dielectric hydrophobic film layer comprises a substrate, at least one side surface of the substrate contains hydroxyl; the preparation raw materials of the bridging structure comprise an acrylate silane coupling agent, and at least one end part of the acrylate silane coupling agent is chemically connected with the hydroxyl group on the surface of the substrate; the hydrophobic layer is arranged on the surface of the side, away from the substrate, of the bridging structure, and the material of the hydrophobic layer comprises fluorine-containing acrylate. The film layer has excellent dielectric strength and surface hydrophobicity and can replace a traditional laminated structure of a dielectric medium and a hydrophobic layer, chemical surface modification of acrylate silane is carried out on a substrate interface, an upper layer is made of a fluorine-containing acrylate material, the lower layer of the prepared dielectric hydrophobic layer is connected with an inorganic substrate in a covalent bond mode, and the dielectric hydrophobic layer is formed. The breakdown resistance of the interface of the electrowetting device is enhanced; and the exposed fluorine element on the upper layer enables the coating to have good hydrophobic performance.

To provide a lightning suppression type surge arrester that has excellent isotropic lightning protection performance and can be easily installed. To provide a lightning suppression type surge arrester that allows for easy adjustment of the dielectric strength. [Solution] The lightning arrester 1 comprises an internal electrode 2 that is grounded, and an external electrode 3 which is electrically insulated from the internal electrode 2 and includes an internal IS that houses the internal electrode 2. The internal electrode 2 includes a flat plate portion 21 which has a circular shape around a central axis AX when viewed from above. The external electrode 3 includes a flat plate portion 31 which faces the upper surface 221 of the flat plate portion 21 and has a circular shape around a central axis AX when viewed from above, and a flat plate portion 32 which faces the lower surface of the flat plate portion 21 and has a circular shape around a central axis AX when viewed from above.

The application relates to the technical field of electric wires and cables, and particularly discloses an overhead parallel bundled conductor. The overhead parallel bundled conductor comprises at least two parallel arranged conductors, and adjacent conductors are fixedly connected through connecting ribs; an insulating layer is arranged on the outer wall of the conductor; the insulating layer comprises the following raw materials: cross-linked polyethylene, an antioxidant, an ultraviolet absorber, nano magnesium oxide, methyl vinyl silicone rubber, flaky boron nitride and a silane coupling agent. The obtained overhead parallel bundled conductor has a heat conduction coefficient of 0.60 W / mk, the elongation at break reduction rate after heat aging is at least 5.0%, the heat dissipation of the overhead parallel bundled conductor is improved, the volume resistivity at 20 DEG C is at most 2.56*1014 ohm*cm, the dielectric strength is at most 40 kV / mm, and the insulating performance of the overhead parallel bundled conductor is improved.

The present invention provides hexagonal boron nitride aggregate particles and the like for obtaining a resin composition that achieves both excellent thermal conductivity and dielectric strength. [Solution] A hexagonal boron nitride aggregate particle (10) having at least one face parallel to the face of the aggregate particle that has the largest projected area, and circumscribing the aggregate particle and having the smallest volume, wherein when the lengths of the three mutually orthogonal sides are La, Lb, and Lc (where La ≥ Lb ≥ Lc), La is 70 μm to 250 μm, and the ratios La / Lc and Lb / Lc are 2.8 or more.