148 results about "Electric field distortion" patented technology

The invention provides a cable semi-conductive shielding material which belongs to the field of electric cable fabrication technique and a preparation method thereof, and the components of the material and the content thereof are as follows: ethylene-vinyl acetate copolymer or linear low density polyethylene 100 proportion by weight, black carbon 10-50 proportion by weight, anti-oxidant 0.1-5 proportion by weight as well as cross linker 0.1-5 proportion by weight. The method provided by the invention can effectively inhibit accumulation of space charges in insulation material, and improves electric field threshold value of injected space charge, which reduces insulation material electric conductivity increased effect induced by space charge-limited current (SCLC), and the electric field distortion rate in XLPE is only 14-19% under -60kV / mm extra electric field for 60 minutes.

A multi-domain liquid crystal display device includes: first and second substrates opposing each other; a plurality of gate lines and data lines on the first substrate lengthwise and crosswise, to define a pixel region; a common auxiliary electrode on a layer equal to the gate lines to surround the pixel region; a gate insulating film on the first substrate; a passivation film on the gate insulating film including the first substrate; a pixel electrode in the pixel region; a light-shielding layer on the second substrate; a color filter layer on the light-shielding layer; a common electrode on the color filter layer; a plurality of electric field distortion dielectric structures patterned in different forms within neighboring pixels; an alignment film on at least one of the first and second substrates; and a liquid crystal layer between the first substrate and the second substrate.

The invention provides an electron gun device for generating a high-brightness femtosecond electronic impulse. The electron gun device comprises an incident window, a sealing component, a vacuum cavity, a photocathode, a grid, an anode, an observation window, a molecular pump, a pre-stage dry pump, an electronic focusing magnetic lens, an RF (Radio Frequency) electronic compression cavity, an RF signal generating device, an x-direction electronic deflector, a y-direction electronic deflector and an electronic scanning plate. Through the invention, the broadening function of the space charge effect on longitudinal pulse duration of an electronic beam impulse is effectively suppressed; the problem that the divergence of the electronic beam is increased due to electric field distortion at a small hole of the anode is solved; and the horizontal and longitudinal electronic impulses have super-high resolution factors, and the real-time detection on super-high time resolution and space resolution of ultrafast processes such as molecular reaction dynamics can be performed.

The invention discloses a stress control body for a plastic insulation high-voltage and direct-current cable connector, and relates to the stress control body for the cable connector. The stress control body for the plastic insulating high-voltage and direct-current cable connector aims at solving the problems that an existing plastic insulation direct current cable prefabricated connector structure hardly meets the requirement for connecting a plastic insulation high-voltage and direct-current cable prefabricated connector with the voltage over 160 kilovolts, and at present a mature plastic insulation direct current cable prefabricated connector design scheme does not exist. The stress control body for the plastic insulating high-voltage and direct-current cable connector is a stress control body for a cross linked polyethylene insulated high-voltage and direct-current cable connector with the voltage between 160kV and 500kV, and is composed of a high-voltage shielding layer, a strengthening insulator, a stress cone and an outer shielding layer, and two side end ports of the strengthening insulator are in a trapezoid shape. According to the stress control body, electric field distortion inside the prefabricated connector can be effectively reduced, the diameter of the prefabricate connector is reduced, the prefabricated connector is convenient to install, the heat dissipation property of the prefabricated connector is improved, and the stress control body can be applied to designing the plastic insulation high-voltage and direct-current cable with the voltage over 160 kilovolts.

The invention relates to the technical field of power transmission and distribution equipment, in particular to a device and method for inhibition of charge injection under a transient electric field.When a high-voltage electric appliance operates in a transient overvoltage waveform, a local high-voltage electric field enables charge injection into an insulating medium and enables continuous physical processes of charge injection and extraction and the like under the action of external stress, and consequently local electric field distortion is aggravated, and internal breakdown and surface flashover faults can be probably caused. The method for inhibition of charge injection under the transient electric field includes steps: selecting a magnesium oxide target material, and adopting a magnetron sputtering instrument to form a magnesium oxide film on the surface of a substrate; performing insulating coverage on a high-voltage equipment current-carrying module by the aid of the substrate. The electron work function of a metal insulating interface can be increased, the surface secondary electron emission coefficient is increased, and insulating surface flashover starting voltage under a high vacuum condition is raised.

The invention relates to a three-dimensional power frequency electric field measurement method and a device capable of correcting the distortion of electric fields. In the method, three pairs of electrode boards of three capacitance type induced voltage sensors are respectively arranged vertical to the direction of a three-dimensional coordinate to form a three-dimensionally-combined capacitance type sensing voltage sensor probe; in a uniform electric field generating device, three induced voltage values and the electric fields corresponding to the three induced voltage values are measured when the directions of applied electric fields are consistent with an X axis, a Y axis and a Z axis; and then the distortion impact factors Lambada are obtained. The device consists of the three-dimensionally-combined capacitance type induced voltage sensor probe and a subsequent signal processing circuit. The method and the device improve the measurement accuracy of the sensors, collect remote measurement data, have the characteristics of small volume and light weight, and is convenient to install and carry; and the measurement accuracy error is about 5 percent. The method and the device are suitable for the measurement of the electric fields nearby transmission lines, transformer substations, high-voltage switch, living quarters and other neighboring areas.

The invention provides a preparation method of an ethylene propylene diene monomer based cable accessory material and the ethylene propylene diene monomer based cable accessory material prepared by the preparation method and belongs to the field of direct-current cable accessory materials. The preparation method comprises the following steps: firstly, obtaining mixed powder of zinc oxide particlesand boron nitride sheets through means of ultrasonic dispersion, dopamine covering and centrifuging; uniformly dispersing the mixed powder of the zinc oxide particles and the boron nitride sheets into ethylene propylene diene monomer through a melting-blending method; then carrying out hot-pressing vulcanization and molding to prepare the ethylene propylene diene monomer based cable accessory material. The cable accessory material prepared by the preparation method is applicable to middle-voltage and low-voltage cable circuits and has relatively stable breakdown strength and relatively high non-linear electric conductivity coefficient; the technical difficulty that electric field distortion is caused in a direct-current high-voltage cable accessory when the material has electric conductivity difference and an interface has space charge accumulation is overcome so that the service life of the cable accessory is prolonged. The preparation method provided by the invention has the advantages of simple technology and needed equipment, low cost, environmental protection and no pollution.

The invention provides a wrapping and molding manufacturing method for a middle connector of a cross-linked polyethylene insulated power cable. The wrapping and molding manufacturing method comprises the following steps of step a, removing an outer sheath and a metal sleeve from a cable at two ends, and reserving a water-blocking buffer band; step b, performing cable preprocessing; step c, welding a wire core conductor; step d, recovering an inner semi-conductive layer: cleaning the port of the semi-conductive layer, and then wrapping the conductor with a semi-conductive layer wrapping band; step e, recovering an insulating layer; and step f, recovering an outer semi-conductive layer. The manufacturing method provided by the invention is convenient to operate; the manufactured middle connector and the cable body form an integrated structure; the electric field stress is uniform in distribution while the electric performance is stable; and the problem of a movable interface generated by different materials between the cable and the middle connector, and the problem of breakdown of the middle connector of the cable caused by partial electric field distortion of the insulating layer due to space accumulated charge are solved.

The invention discloses a high voltage and ultrahigh voltage flexible direct current transmission optical fiber composite extrusion insulation submarine cable. A water-resistant conductor is arranged at the center of the cable. A semiconductive wrapping belt, an extrusion inner shielding layer, an extrusion insulation layer, an extrusion outer shielding layer, a first buffer water-resistant layer, a second buffer water-resistant layer, a metal sleeve, an extrusion inner sheath, an extrusion molding steel wire and an extrusion outer sheath are sequentially wrapped outside the water-resistant conductor. Optical fibers are placed between the buffer water-resistant layers. The insulation layer overcomes the shortcoming of electric field distortion even breakdown caused by space charge accumulation of a traditional cable insulation material. A copper sleeve with good physical performances such as mechanical strength and fatigue strength is adopted to ensure safe reliable running. The submarine cable resolves the problem of heavy metal pollution caused by a lead sleeve utilized in a traditional submarine cable and prevents environment pollution caused by the fact that an asphalt wrapping plastic rope is coated on the surface of a bare steel wire of a traditional submarine cable to serve as a steel wire corrosion-resistant layer by extruding the extrusion molding steel wire and the extrusion outer sheath on the inner sheath.

According to the present invention, a charged particle beam device has an unlimitedly rotatable sample stage and an electric field control electrode for correcting electric field distortion at a sample peripheral part. A voltage is applied to a sample on the unlimitedly rotatable sample stage through a retarding electrode that is in contact with a holder receiver at a rotation center of a rotary stage. An equipotential plane on the electric field control electrode is varied by applying a voltage to the electric field control electrode, and following this the equipotential plane at a sample edge is corrected, which enables the sample to be observed as far as its edge.

A multi-domain LCD device includes first and second substrates, gate and data lines defining a plurality of pixel regions on the first substrate, at least one first electric field distortion unit formed at the pixel region, a pixel electrode formed at the pixel region and having at least one second electric field distortion unit, a common electrode formed on the second substrate, and a liquid crystal layer formed between the first and second substrates, having liquid crystal molecules symmetrically arranged by the first electric field distortion unit and having a plurality of domains generated by the first and second electric field distortion units.

An electro-processing apparatus has a contact ring including a seal which is able to compensate for electric field distortions created by a notch (or other irregularity) on the wafer or work piece. The shape of the contact ring at the notch is changed, to reduce current crowding at the notch. The change in shape changes the resistance of the current path between a thief electrode and the wafer edge to increase thief electrode current drawn from the region of the notch. As a result, the wafer is plated with a film having more uniform thickness.

A liquid crystal display device includes: a first substrate and a second substrate; a gate line and a data line on the first substrate that cross each other to define a pixel region; a pixel electrode in the pixel region; a thin film transistor at the crossing of the gate and data lines, and connected to the pixel electrode; at least one first electric field distortion unit in the pixel electrode to control a liquid crystal director by electric field distortion; a second electric field distortion unit between the pixel electrode and the first substrate; and a layer of liquid crystal molecules between the first and second substrates

The invention discloses a manufacturing process of a cross-linked polyethylene insulated cable main terminal molding stress control module. The manufacturing process comprises the steps of fusion cross-linking between a cable factory insulating layer and a filling insulator, fusion cross-linking between a cable factory semiconducting layer and a filling semiconducting layer and fusion cross-linking between the filling insulator and the filling semiconducting layer. The manufacturing process is convenient to operate; the manufactured stress control module and a cable body form an integrated structure; the electrical property of electric field stress distribution is stable, the problem that a movable interface is generated because a cable and the stress control module are made of different materials is solved, and the problem of breakdown of cable insulation as a result of local electric field distortion of the insulating layer caused by accumulative charge in the space of an insulating border is avoided. The manufacturing process breaks through the technical bottleneck in the industry internationally that an extra-high voltage direct current cable is free of terminal connection, and meets the requirements for submarine cable and alternating current and direct current high-voltage / extra-high-voltage cable terminal project field fabrication and fault repair.

The invention discloses an insulator material, an insulator and a preparation method. The insulator material mainly comprises, by weight, 25-35 parts of epoxy resin, 5-55 parts of curing agents and 5-55 parts of micron silicon carbide fillers and nano-silicon carbide fillers in 100 parts. The particle size of the micron silicon carbide fillers is 10-50 micrometers, and the particle size of the nano-silicon carbide fillers is 50-100 nanometers. The micron silicon carbide fillers and the nano-silicon carbide fillers with two different sizes are compounded and doped into the epoxy resin by the aid of the function of the curing agents, synergistic effects of the fillers and the epoxy resin are sufficiently achieved, ratio is controlled, and the insulator material has non-linear electric conductivity similar to that of silicon carbide. The insulator material is applied to the insulator, surface electric field distribution of the insulator can be effectively improved and homogenized, so that local electric field distortion factors are decreased, and faults such as surface discharge or flashover of the insulator are reduced.

The invention discloses a gradient structure polyvinylidene fluoride based composite dielectric and a preparation method thereof. The composite dielectric is composed of a BZCT NFs filling phase and PVDF (Polyvinylidene Fluoride), wherein the BZCT NFs filling phase is in content gradient multilayer arrangement in the composite dielectric. According to the invention, a large aspect ratio inorganicnanofiber filling phase and polyvinylidene fluoride based composite thin film dielectric is prepared by combining the processes such as a sol-gel method, an electrospinning technique and hot pressing,and the nanofiber / polymer based composite thin film dielectric is subjected to high-temperature hot pressing and quenching treatment to obtain a compact composite thin film. The multilayer structure / polymer based composite dielectric with one-dimensional nano filling phase content gradient prepared according to the invention has the characteristics of good flexibility, low cost, high breakdown strength, excellent energy storage performance and the like, can buffer local electric field distortion caused by the high-content inorganic filling phase, thus improves the energy storage performance,and is used for manufacturing high-performance energy storage devices.

The invention discloses an insulating property optimization method of a 500kV porcelain pole breaker used for an alternating current filter. The insulating property optimization method comprises the following steps: 1) judging the fault type of the 500kV porcelain pole breaker, wherein the fault type comprises an external insulating fault and an internal insulating fault; and 2) when the fault type is an external insulating fault, optimizing a dry arcing distance, improving the air pressure of an arc extinguish chamber or investing a breaking phase selected function when the fault type is a restrike fault, improving contact materials when the fault type is the electric field distortion of the arc extinguish chamber since the contact splashes metal foreign matters, and optimizing a voltage sharing capacitor and an arc extinguish chamber arrangement structure when the fault type is that the contact of the arc extinguish chamber radially breaks down the inner wall of a porcelain cover. According to different fault types, different optimization methods used for improving the insulating property of the breaker are put forward to guarantee that insulating faults including the internal restrike, the external insulating flashover and the like of the arc extinguish chamber can be avoided under the situation that the breaker frequently switches the alternating current filter and is subjected to high transient recovery voltage.

The invention relates to the high-voltage power transmission and transformation field, particularly to a flat plate type particle capturing apparatus and power transmission and transformation equipment. The flat plate type particle capturing apparatus comprises a shielding cover containing a flat plate part. The shielding cover is fixed at the inner wall of a cylinder based on a fixation structure; a zero-potential cavity is formed between the shielding cover and the cylinder; and a gap for particle entrance into the cavity is formed between the edge of the shielding cover and the inner wall of the cylinder. A particle can enter the cavity inside the shielding cover through the gap; an electric-field acting force of the particle is eliminated under the shielding effect of the shielding cover. Besides, the shielding cover can be used for preventing particle floating inside the cavity and thus the particle can not escape to a high-electric-field area, thereby avoiding an insulation breakdown caused by electric field distortion due to the particle and reducing the influence on the insulation performance of the power transmission and transformation equipment by the particle. The shielding cover is arranged inside the cylinder to capture particles. The shielding cover uses a flat plate structure; and the structure is simple and processing is convenient.

The invention relates to a method for generating cold plasma by gas discharge under high pressure and a dielectric barrier discharge device using the method. In the method, dispersed conducting particles are added to a discharge space where an electric field is applied, the conducting particles cause electric field distortion, corona discharge firstly occurs near the conducting particle surfaces, and a discharge channel approximately develops along the leading direction of a power line. The spatial distribution evenness and density of discharge and generated cold plasma are lead by the distribution of the conducting particles. Dispersed conducting particles are added to the dielectric barrier discharge device, so that the average electric field strength applied by the discharge space is lower than the critical breakdown field strength of gas. Therefore, the discharge and the generated cold plasma are distributed more evenly in space, the voltage required by discharge can be reduced, and the invention can be widely used for various gas phase plasma chemical reactions.

The invention provides insulating rubber for an ultrahigh-voltage direct-current cable accessory and a preparation method thereof. The insulating rubber is prepared from the following raw materials: ethylene propylene diene monomer, zinc oxide, stearic acid, an anti-aging agent, a plasticizer, a reinforcing agent, a nano filler modifier, a silane coupling agent, a vulcanizing agent and a vulcanization accelerator. By adjusting the dosage of the nano-filler modifier, changing the trap depth in the insulating material, adsorbing free charges in the material, reducing the number of the free charges and reducing charge accumulation, electric field distortion is reduced, electric field distribution is more uniform, effective control over volume resistivity is achieved, the electrical resistivity of the insulating material in a stress cone and the electrical resistivity of a cable insulating material reach the optimal matching state under different environment use temperature conditions. Meanwhile, electrical, mechanical, aging and forming properties and the like meet the technical index requirements, and the material can be applied to the field of ultrahigh-voltage direct-current cableinsulating materials.

The invention discloses an electric field intensity calculating method and device of an oil paper insulation system. When the electric field intensity of the oil paper insulation system is calculated, the electric field intensity of space charge of the oil paper insulation system is calculated first according to space charge density, and then the electric field intensity of the whole oil paper insulation system is calculated. According to the method, the space charge effect is considered in the calculating process of the electric field intensity of the whole oil paper insulation system, electric field distortion of the oil paper insulation system can be represented, and accordingly the calculating accuracy of the electric field intensity of the oil paper insulation system is improved.

The invention discloses a comprehensive evaluation method for defects of basin-type insulators of ultra / extra-high voltage GIS equipment. The method comprises the following steps: determining main latent defect conditions existing on typical basin-type insulators of the GIS equipment; establishing an electric field finite element analysis program, and obtaining electric field distortion coefficients of the basin-type insulator under various defects through simulation and trial measurement; calculating electric field intensities of different radial distances of the basin-type insulator under various defects; and carrying out defect classification according to flashover types, constructing a comprehensive evaluation function of latent defects, and evaluating the defect grade of the basin-type insulator according to the evaluation function value. According to the invention, on the premise that GIS equipment is not dismounted, quantitative analysis is carried out on the latent defects of the basin-type insulator, various accidents caused by the latent defects of the basin-type insulator are reduced or avoided to a great extent, safe and reliable operation of GIS equipment and even stable operation of the whole power system are ensured, and the method has wide practicability and economical efficiency.

The invention discloses a multifunctional inflatable experiment device for innocuous treatment of metal particles in the field of high-voltage power transmission line testing equipment in an electric system. The multifunctional inflatable experiment device mainly comprises a cylindrical metal cavity, an electrode module, an organic glass window, an inflating and deflating module and experiment function modules. The organic glass window is hermetically fixed by two ends of the cylindrical metal cavity through a flange, an electrode is fixed in the middle of front-end organic glass window to form a coaxial cylindrical electrode system, and a cylindrical body of the cavity is provided with an inflating and deflating hole which is connected with the inflating and deflating module. Experiment function module mounting positions are arranged on the inner wall of the cavity, so that rapid replacement of various function modules can be achieved. The multifunctional inflatable experiment device has the advantages of small electric field distortion, experiment function switching convenience and safety, simplicity and convenience in observation, can be used for experiment researches on alternating / direct-current voltage environments and metal particle innocuous treatment measures such as electrode film lamination, insulator properties and particle trap, and offers strategies for metal particle pollutant prevention and control under actual working conditions.

The invention relates to a direct-current bushing voltage-sharing device based on a low-conductivity temperature coefficient epoxy composite material. A current-carrying conductor is arranged in the center of a bushing, an outer conductor is coaxially arranged outside the current-carrying conductor, a thermal insulation air gap is arranged between the current-carrying conductor and the outer conductor, and an epoxy capacitor core is wrapped outside the outer conductor. A voltage-sharing aluminum foil is arranged in the epoxy capacitor core, the bushing capacitor core is located in the bushing, and SF6 insulating gas is filled between the bushing capacitor core and the bushing. A metal flange is installed at the lower end of the bushing and outside the sleeve capacitor core, and the lower end of the bushing capacitor core is immersed in transformer oil. After the epoxy resin in the high-voltage direct-current bushing is replaced with the epoxy resin composite material with the low conductivity temperature coefficient, the internal electric field of the capacitor core is remarkably homogenized, the maximum radial and axial electric field intensity is effectively reduced, and the electric field distortion is weakened.

The invention relates to the high-voltage power transmission and transformation field, particularly to a spherical-crown type particle capturing apparatus and power transmission and transformation equipment. The spherical-crown type particle capturing apparatus comprises a shielding cover in a spherical-crown shape. The shielding cover is fixed at the inner wall of a cylinder based on a fixation structure; a zero-potential cavity is formed between the shielding cover and the cylinder; and a gap for particle entrance into the cavity is formed between the edge of the shielding cover and the inner wall of the cylinder. A particle can enter the cavity inside the shielding cover through the gap; an electric-field acting force of the particle is eliminated under the shielding effect of the shielding cover. Besides, the shielding cover can be used for preventing particle floating inside the cavity and thus the particle can not escape to a high-electric-field area, thereby avoiding an insulation breakdown caused by electric field distortion due to the particle and reducing the influence on the insulation performance of the power transmission and transformation equipment by the particle. The shielding cover has the spherical-crown-shaped structure, so that the particle falling down on the shielding cover is not easy to slide. The shielding cover is arranged inside the cylinder to capture particles and the structure is simple.

Disclosed is a nonlinear material-based voltage-sharing electrode in a basin type insulator. The voltage-sharing electrode comprises central electrodes, a central embedded part and a ground electrode;the central embedded part is mounted in the connecting position of the two central electrodes; the central embedded part and the ground electrode are connected through an insulator; and a nonlinear material coating layer is arranged between the insulator and the central embedded part and on the exteriors of the central electrodes. Beneficial effects are achieved as follows: the nonlinear materialcoating layer is prepared by adopting a specific nonlinear material formula; in the structure, in the operating process of the basin type insulator in a direct current environment, electric field regulation on the end, close to the central electrodes, of the insulator can be realized by the internal nonlinear material coating layer; in addition, when the surface electric field of the nonlinear material coating layer almost reaches a set electric field distortion value, the surface electric field distribution can be adjusted adaptively; and therefore, according to the electric field intensityin the region, the surface charge accumulation amount at the proximal electrode end can be adjusted adaptively so as to limit the surface charge amount to be within a safe range constantly.

An optical fiber Fabry-Perot electric field sensor used for electrostatic field measurement belongs to the field of sensors. The invention aims to solve the problem that the metal probe of the existing electric field sensor easily causes electric field distortion, thereby affecting the test result. It includes a hollow hemisphere, a quartz column, two quartz rods, an insulating outer wall, a quartz sheet, a trimmer and an optical fiber collimator; the two quartz rods are placed horizontally and parallel, and two quartz rods are welded vertically in the middle of the quartz column, and the upper end of the quartz column The glue is inherently hollow hemisphere, and the upper end of the quartz column is located in the cavity of the hollow hemisphere, the lower end of the quartz column is inherently a quartz sheet, the quartz sheet is placed horizontally, the upper end surface of the fiber collimator is parallel to the end surface of the quartz sheet, and the fiber collimator is glued in the fine-tuning In the device, the outer sides of the two quartz rods, the quartz sheet and the upper part of the trimmer are provided with an insulating outer wall; the upper end face of the fiber collimator and the end face of the quartz sheet are coated with a film with a reflectivity of 50%, and a FP is formed between the two reflective films. cavity. The invention is used for electric field measurement.

The present invention relates to a colorant, a colored resin composition comprising the colorant, and a color filter prepared using the colored resin composition. A novel reddish yellow pigment may be used in combination with a green pigment and a yellow pigment in order to reduce the imbalance of the intramolecular polarization of the green pigment and / or the yellow pigment in the colorant. As a result, a color filter comprising a colored layer in which a light leakage phenomenon, caused by an electric field distortion, is reduced.

The invention relates to a method and a device for improving pollution flashover performance of a suspension insulator. The method comprises steps as follows: a transmission line at a high-voltage end of the suspension insulator is sleeved with an insulation sheath, a grading ring for a line grip is arranged at the line grip, and a sheath grading ring is arranged at each of two ends of the insulation sheath, so that the electric field distortion is eliminated. The insulation sheath is made of silicone rubber and the like, and the suspension insulator is one of a porcelain insulator string, a porcelain composite insulator string, a glass insulator string, a glass composite insulator string, a rod porcelain insulator, a composite insulator and the like. According to the method and the device, after the insulation sheath is additionally mounted on the transmission line at the high-voltage end of the suspension insulator, the effective leakage distance of the suspension insulator can be increased, so that the pollution flashover performance of the suspension insulator can be improved. The device is mounted on the transmission line and runs actually on site in 2009, and the running effect is good according to repeated line patrols.