140 results about "Electric field distortion" patented technology

The invention relates to the technical field of power equipment state monitoring, in particular to a lightning arrester state monitoring method, system and equipment based on multi-physics field coupling and a storage medium. Acquiring current-voltage characteristic parameters, temperature distribution data and mechanical stress data of the lightning arrester, performing electro-thermal-mechanical coupling analysis based on multi-physical field monitoring data, identifying overlapping positions of an electric field distortion area, a temperature abnormal area and a stress concentration area, and determining the overlapping positions as a degradation key area; establishing a correlation response relationship between the leakage current and the temperature and a transfer response relationship between the temperature and the mechanical stress for the deteriorated key area; on the basis of the leakage current change trend of the degradation key area and the coupling influence of the superimposed temperature field and stress field, a degradation feature fusion factor is constructed, the evolution law of the degradation feature fusion factor in the time sequence is analyzed, and the degradation threshold value under the multi-field synergistic effect is determined in combination with the electric-thermal coupling acceleration effect and the thermal-mechanical coupling weakening effect.

The invention relates to the technical field of cables, and particularly discloses a cable terminal simulation and state evaluation method and system in a humid environment, multiple types of sensor arrays are deployed, distributed temperature and humidity sensors are installed at key parts of a cable terminal, and aiming at the technical problems of one-sided single-dimensional monitoring, simulation model solidification and insufficient static weight adaptation, the cable terminal simulation and state evaluation method and system are provided. Cooperative acquisition of multiple parameters such as temperature and humidity, partial discharge and corrosion current is achieved through deployment of multiple types of sensor arrays, the nonlinear interaction relation between humidity permeation and electric field distortion is dynamically reflected in combination with a multi-physics field coupling simulation model, the one-sidedness of single parameter monitoring is solved, and the risk misjudgment rate is reduced by 40% or above; a dynamic water film thickness model is adopted to update interface parameters of the sealing ring in real time, a simulation result is updated per hour in combination with a finite element-boundary element hybrid algorithm, an electric field distortion simulation error is controlled within 12%, and the simulation precision is improved by more than one time compared with a fixed boundary condition.

The invention discloses an ultra-short channel MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) structure capable of resisting a short channel effect and a manufacturing process thereof, and belongs to the field of semiconductors. Comprising a drain electrode, a semiconductor epitaxial layer, a source electrode and a grid electrode; the semiconductor epitaxial layer comprises an N substrate layer, an N drift layer, a P + layer, an N well layer and a P well layer, and a lightly doped N layer is arranged in the middle of the N drift layer of each MOS cell; the core design is that a side symmetric P layer forms a strong depletion region, and drain induced barrier lowering (DIBL) and threshold voltage drift are directly inhibited; the top P-layer, the combined P-layer, the rectangular P-layer, the long-strip P-layer and the like form an auxiliary depletion region to further compress channel edge electric field distortion and cooperatively strengthen suppression on a short channel effect, so that the problem of performance degradation caused by shortening of the channel length in an ultra-short channel structure is solved, and the device can still keep stable electrical characteristics under the condition of small size.

The invention discloses a bus duct insulation performance evaluation system, and the system comprises a microscopic collection module which is used for collecting a joint interface microscopic image through a scanning electron microscope, and obtaining material distribution and defect parameters; the finite element analysis module is used for performing finite element analysis by utilizing the material distribution and defect parameters and calculating an electric field intensity gradient value; the electric field distortion identification module is used for identifying an electric field distortion area according to the electric field intensity gradient value and determining a partial discharge position coordinate; the dielectric parameter measurement module is used for measuring a dielectric constant and a loss factor at the partial discharge position coordinates to generate a change curve; the aging index calculation module is used for extracting peak value and slope characteristics from the change curve and calculating a material aging index; the correlation model building module is used for building a correlation model of the material aging index and the insulation strength and generating a prediction coefficient; and the evaluation optimization module is used for correcting the insulation performance evaluation value by using the prediction coefficient and outputting an optimization evaluation report.

The invention relates to the technical field of power cables, in particular to a high-toughness polyethylene insulated power cable and a preparation method thereof. The invention relates to a preparation method of a high-toughness polyethylene insulated power cable. The preparation method comprises the following steps: preparation of a toughening flame-retardant modifier, preparation of a montmorillonite compound, preparation of a toughening modified montmorillonite compound and preparation of the polyethylene insulated power cable. Through specific material mixing and grafting modification, the performance of the cable insulation layer is remarkably improved. The deep trapped charge trapping capability is enhanced, space charge accumulation and electric field distortion are avoided, the DC voltage level and the operation safety are improved, and the dielectric loss and the aging speed are reduced; the dispersibility of montmorillonite is also optimized, a physical reinforcing network is formed, and the mechanical property and the electric breakdown resistance are improved; meanwhile, toughening and flame retardance are coordinated, the problem of embrittlement caused by a traditional flame retardant is solved, and the service life of the insulating layer is comprehensively prolonged.

The invention discloses a method for predicting electrostatic potential in a storage tank in oil collection operation of a storage tank, and the method comprises the following steps: initializing and constructing a knowledge respectively establishing a multipath leakage equivalent circuit model library for a fixed roof tank and an inner floating roof tank, the initial fitting impulse current calculation coefficient range, the optimization constraint condition and the conductivity-temperature relation function library are stored; real-time prediction and monitoring: acquiring multi-dimensional data in real time, preprocessing, dynamically calibrating charge generation items, and calculating charge balance by combining a multi-path leakage model and capacitance correction; meanwhile, a high-frequency flow meter is used for detecting the sudden change of the flow speed to trigger an LSTM transient compensation model to predict the transient electrostatic potential variable quantity, and the transient electrostatic potential variable quantity is superposed on a physical model predicted value result to obtain a final electrostatic potential predicted value; dynamic risk assessment and early warning: triggering different levels of early warning according to an assessment result; and deep analysis of abnormal working conditions: when the abnormal working conditions occur, automatically starting local CFD micro-simulation driven by edge calculation to verify local charge aggregation and electric field distortion conditions.

The invention discloses a self-repairing anticorrosive paint, a preparation method thereof and an anticorrosive application on the surface of a hardware fitting, the self-repairing anticorrosive paint is composed of a two-component system of a matrix component and a functional component, a composite conductive network formed by multi-walled carbon nanotubes is introduced, ion migration and electric field distortion under a strong electric field can be inhibited, and the electrochemical corrosion rate is reduced; the photo-thermal response type microcapsule can realize near-infrared light triggered in-situ repair of micron-sized cracks, and corrosion medium permeation is avoided; a gradient interface strengthening structure and a nano reinforced phase formed by the nano silicon dioxide can improve the cracking resistance and wear resistance of the coating in a wide temperature range (-50 DEG C to 150 DEG C) and under mechanical vibration, the self-repairing anticorrosive coating is extremely low in corrosion rate in a strong electric field environment, has wide temperature range cracking resistance and micro-crack in-situ repairing performance, and can be applied to the field of high-temperature-range self-repairing anticorrosive coating. And the problems of coating interface stripping, lack of self-repairing capability, high maintenance cost and the like of key metal materials of the ultrahigh-voltage power transmission and transformation equipment in complex climatic environments such as high humidity and high salt are solved.

The invention relates to the technical field of power grid data processing, in particular to a power grid digital twinning technology analysis method and system based on AI image recognition, and the method comprises the following steps: collecting a visible light image and an ultraviolet image of an insulator string through a multi-spectral camera carried by an unmanned aerial vehicle, and obtaining line leakage current waveform data at the same time; generating a multi-scale pollution feature matrix; calculating the equivalent resistivity of the polluted conductive path; reconstructing surface electric field distribution of the digital twin based on the equivalent resistivity, and simulating field intensity distortion gradients under different humidity conditions; when the field intensity distortion gradient reaches a preset percentage of the air breakdown field intensity, a graded early warning signal is generated; according to the invention, the electric field distortion of the dirty layer under different humidity conditions is simulated to generate the humidity-field intensity mapping relation, so that whether the insulation performance of the electrical equipment is affected or not can be judged.

The invention relates to the technical field of partial discharge processing, and discloses a partial discharge processing method and system based on electric field analysis, and the method comprises the steps: synchronously collecting the multi-point electric field intensity and charge density of a device surface, recognizing a charge abnormal region, and calculating an electric field non-uniformity index; inputting the information into a finite element analysis model, simulating an electric field distortion process, and positioning potential discharge induction points; predicting a charge accumulation trend of each potential point in combination with historical operation data, and constructing an optimization function taking minimization of global electric field distortion and charge accumulation risk as a target according to the charge accumulation trend; and with the function as a convergence target, an optimal electric field compensation parameter is automatically solved through iterative calculation. According to the partial discharge processing method and system based on electric field analysis, predictive recognition and counteracting are carried out on discharge core inducements, and active and accurate suppression of partial discharge of equipment is achieved.

The invention relates to the technical field of electric power, in particular to a multi-field coupling optimization design method applied to a high-voltage wall bushing. According to the technical scheme, the method comprises the following steps: (1) constructing a three-dimensional geometric model of the high-voltage bushing, and solving an electric-thermal bidirectional coupling field based on a finite element method; selecting a to-be-optimized variable, and constructing a dual-objective function of an electric field distortion coefficient and a hot spot temperature through nonlinear regression; (2) carrying out multi-target optimization by adopting an improved multi-target particle swarm algorithm coupled with the soup discharge discrimination, and synchronously executing discharge risk screening in an iteration process; and (3) generating an optimization design scheme based on the Pareto leading edge solution set, and verifying that the design is effective through a field distribution test. Therefore, the establishment of the optimization problem is more accurate, the optimization efficiency is higher, and the phenomena of partial discharge and the like of the bushing caused by a local high-field-intensity region generated in the design can be avoided.

The invention relates to the technical field of electrical digital data processing, and provides a high-voltage cable semi-conductive shielding layer surface defect evaluation method, which comprises the following steps: S1, obtaining shielding layer surface defect morphology characteristics; s2, constructing a finite element model based on defect morphology features, and executing analogue simulation calculation; s3, constructing a standardized response mapping data set based on an analogue simulation calculation result; s4, on the basis of the standardized response mapping data set, constructing a neural network model and executing iterative training; s5, performing finite element simulation based on the geometric shape of the defect contour so as to verify the accuracy of the neural network model; according to the invention, high-flux prediction of electric field distortion caused by surface defects of the semi-conductive shielding layer of the target cable can be realized so as to evaluate the influence on an insulation system. Moreover, the prediction and evaluation speed of the method is far higher than that of traditional simulation, and the method can also show higher precision for untrained defect prediction.

This invention discloses a method and system for identifying safety hazards in power equipment, specifically relating to the field of intelligent operation and maintenance technology for power equipment. It addresses the hidden operational risks caused by the mismatch between equipment aging characteristics and generalized strategies in existing technologies. By collecting multi-source operating status data of power equipment and constructing an asynchronous dataset, it dynamically identifies spatial electric field distortion gradients and contact resistance fluctuations as abnormal parameters. Based on equipment structural characteristics, it assigns differentiated weights to these abnormal parameters, quantifying the risk levels of different areas. It analyzes the temporal correlation between contact resistance and electric field response to determine the breakdown risk caused by insulation degradation. Combining the risk levels, it generates maintenance cycle optimization schemes and electric field compensation parameters, and dynamically updates the aging model based on execution feedback. Through dynamic adaptation of equipment status and control strategies, it achieves early warning and precise intervention for potential hazards, effectively solving the control mismatch problem caused by neglecting material degradation characteristics in traditional methods.

A vegetation flame condition direct current gap multi-physical field coupling simulation method, determines the physical quantity required for simulation of charged particle motion, distribution and electric field distribution in the air gap under the condition of applying direct current voltage under the condition of typical vegetation flame, the connection between each physical field; determine the control equation of each physical field; determine the simulation method of multi-physical field coupling; determine the chemical reaction equation corresponding to the vegetation and the pyrolysis material coefficient; measure the vegetation flame temperature distribution and leakage current data by combustion test; compare the simulation obtained flame temperature distribution and leakage current with the test obtained temperature distribution and leakage current data, determine the vegetation pyrolysis reaction equation and chemical reaction rate parameter; simulation calculation obtains the charged particle concentration distribution characteristics and the space electric field distribution characteristics affected by the charged particles generated by the flame combustion. The present application can obtain the charged particle motion, distribution characteristics and electric field distortion of the direct current gap under the condition of typical vegetation flame.

The application discloses a space charge distribution calculation method based on tunneling effect and hole extraction restriction, and belongs to the technical field of electrical engineering, and comprises the following steps: a one-dimensional finite element structure model is established, taking polymer material as a main body and electrodes as boundaries; a periodic polarity reversal voltage is applied at the electrode boundary by coupling Maxwell electromagnetic field theory and Nernst-Planck theory, and a recombination carrier injection model and a hole extraction restricted boundary condition are introduced, so that a polymer material space charge distribution model based on tunneling effect and hole extraction restriction mechanism is obtained; and the polymer material space charge distribution model is solved to obtain the space charge distribution and electric field distortion law of the polymer material under the conditions of strong electric field and polarity reversal. The method solves the problem that the existing space charge model cannot effectively depict the tunneling emission and hole extraction restriction effect at the electrode interface, and provides important support for the polymer insulation aging research under the conditions of strong electric field and polarity reversal.

The invention relates to the technical field of material analysis, and discloses a ceramic material surface electric field simulation and prediction method, device, equipment and medium, and the method comprises the steps: building a crystal model according to the crystallographic information of a ceramic material; calculating the defect formation energy, the defect energy level, the carrier migration potential barrier and / or the migration rate of the crystal model; constructing a finite element simulation multi-physical field based on the defect energy level, the carrier migration potential barrier and / or the migration rate; and simulating and predicting the electric field intensity and distribution on the surface of the ceramic material based on the finite element simulation multi-physical field. Thus, accurate prediction from microscopic physical essence to macroscopic engineering performance is constructed for the first time, the simulation precision is greatly improved, and a physical mechanism of electric field distortion can be deeply disclosed, so that a formula and a structure can be simulated and optimized before material preparation, the research and development period is greatly shortened, and the research and development cost is reduced; and a core theoretical basis is provided for realizing accurate design of the high-voltage insulator.

The utility model belongs to the technical field of gas-insulated metal-enclosed switchgear, and discloses a shielding device for a GIS bushing, the shielding device can be sleeved on the periphery of a terminal plate and a flange of the GIS bushing to balance an electric field, the shielding device comprises a first shielding ring, a second shielding ring, and a third shielding ring, the second shielding ring and the first shielding ring are coaxially arranged at an interval; the plurality of supporting pieces are fixedly connected between the first shielding ring and the second shielding ring, and the terminal plate and the flange are configured to be located in an accommodating space defined by the plurality of supporting pieces; the connecting plate is arranged in the containing space and connected with the multiple supporting pieces, the connecting plate is provided with receding holes, the receding holes are used for allowing the terminal plate to penetrate through, and the top of the flange is configured to bear the connecting plate. According to the utility model, the occurrence of electric field distortion areas can be significantly reduced, and a good electric field balancing effect is achieved.

The invention relates to the technical field of high-voltage direct-current cables, in particular to a load circulation system of a high-voltage direct-current cable system and an operation method, and the system comprises a temperature circulation module which comprises a PID temperature control unit and a conductor heating unit, and the conductor heating unit is electrically connected with the PID temperature control unit; the multi-polarity voltage loading unit is provided with a high-voltage source, and the high-voltage source can output voltage from the negative polarity to the positive polarity; and the distributed electric field sensor is embedded at the interface of the cable accessory stress cone and the insulation, and the distributed electric field sensor is in contact with the surface of the cable accessory stress cone. The method has the beneficial effects that the tangential electric field distribution at the cable accessory stress cone and the insulation interface is monitored in real time through the distributed electric field sensor, and the maximum electric field intensity is reduced in combination with the low ripple design of the multi-polarity voltage loading unit and the design of the interface conductivity matching layer, so that the electric field distortion and the surface discharge risk are effectively inhibited, and the reliability of the cable accessory is improved. And the operation stability of the high-voltage direct-current cable system under complex working conditions is improved.

The invention provides an SF6 / epoxy core interface fluorinated layer charge accumulation-dissipation regulation and control method and characterization system, a nanoscale fluorinated layer is constructed on the surface of epoxy resin through gradient gas phase fluorination, and the proportion of C-F bonds of the epoxy resin fluorinated layer is controlled to be 68% + / -2% through XPS in-situ characterization real-time optimization. The charge behavior and trap state distribution of the SF6 / epoxy interface are regulated and controlled, the interface breakdown field strength is improved, and the real-time monitoring of the trap state density and the dynamic charge distribution is realized by integrating an XPS probe and a surface potentiometer in combination with a characterization system. Through a cross-scale technical path of molecular scale fluorination site regulation and control-nanostructure morphology control-macroscopic performance real-time verification, accurate regulation and control of epoxy resin fluorination layer interface charges and trap state density are realized, the problems that the trap state density of a traditional fluorination layer is relatively high, and carrier accumulation and electric field distortion are easily caused are solved, and the performance of the epoxy resin fluorination layer is improved. Therefore, the insulating performance is improved, and the method is suitable for performance optimization of epoxy insulating parts in SF6 gas insulated electrical equipment.

The invention discloses an epoxy solid-sealed insulation structure electric field distribution distortion characteristic detection method, system, medium and equipment, and the method comprises the steps: preparing a circular-plate-shaped epoxy resin sample with a built-in electric field probe, placing the epoxy resin sample between plate electrodes, and applying an electric field to obtain the internal electric field distribution of epoxy resin; setting a plurality of measurement time points, and recording internal electric field intensity data, measured by the electric field probe, of the epoxy resin sample at each time point; based on a bipolar carrier transport model, a multi-physics-field coupled epoxy resin two-dimensional axisymmetric finite element simulation model is constructed by using finite element simulation software, and the two-dimensional axisymmetric finite element simulation model is subjected to mesh generation and solution. Obtaining simulation results of space charge distribution and electric field distribution in the epoxy resin sample under different pressurization time; and comparing epoxy resin internal electric field distribution with a simulation result, and analyzing an influence mechanism of space charges on epoxy resin internal electric field distortion.

The invention discloses a distribution transformer small-size defect identification method and device based on a large electric power model and a storage medium, and belongs to the field of distribution transformer defect identification. The method comprises the steps that electric field data, voltage data and current data of a distribution transformer are collected, and the electric field distortion degree is calculated based on the electric field data; calculating a dielectric loss angle increment based on the voltage data and the current data; constructing a power operation semantic network through the distribution transformer image, and performing electric field distortion detection in combination with the electric field distortion degree to obtain an electric field distortion detection result; performing fault type identification based on the dielectric loss angle increment and dielectric loss angle parameters in the power operation semantic network to obtain an abnormal fault type; and matching in a preset small-size defect identification library based on the electric field distortion detection result and the abnormal fault type to obtain the small-size defect type of the distribution transformer. Therefore, by implementing the method, accurate identification of the small-size defect type of the distribution transformer can be realized.

This disclosure provides a method, apparatus, device, and storage medium for predicting the probability of lightning strikes on transmission lines. The method includes acquiring real-time distribution data of a target transmission line, inputting a preset environmental correction model, performing localized parameter calculations to obtain the physical field calculation parameter set and regional lightning discharge conditions for the target area corresponding to the target transmission line, inputting a charge movement model to determine the predicted electric field distortion data and the predicted charge concentration distribution data along the line, aligning the two with pre-acquired lightning measurement data spatiotemporally and performing error analysis to obtain error spatiotemporal distribution data, and adjusting the environmental correction model and the charge movement model accordingly. The final generated lightning strike probability report enables the prediction of spatial charge movement and electric field distortion under lightning strikes on high-altitude transmission lines and can specifically assess flashover risks, providing a quantitative analysis tool for differentiated lightning protection design of high-altitude ungrounded transmission lines.

The invention relates to the technical field of high-voltage power transmission equipment, in particular to a design method, device and system for an anti-aging composite insulator in a hot and humid area. The large umbrella diameter, the umbrella skirt spacing and the umbrella skirt dip angle are determined through the umbrella skirt structure design step, the core rod structure material, the glass fiber volume fraction and the core rod waterproof coating total thickness are determined through the core rod structure design step, and the hardware fitting base material and surface treatment, the ceramic layer total thickness and the bowl head thickness are determined through the hardware fitting structure design step. The length of the long axis and the length of the short axis of the elliptical ring are determined through the grading ring structure design step, and finally performance verification is conducted on the designed anti-aging composite insulator according to the preset acceptance standard so that it can be guaranteed that the designed anti-aging composite insulator can not appear in the humid and hot environment. The problems of rapid umbrella skirt aging, core rod water tree development, severe hardware fitting corrosion and grading ring electric field distortion are solved.

The invention discloses a drop-out fuse fusion tube with an automatic on-off function. The drop-out fuse fusion tube comprises a fusion tube body, the series connection automatic on-off branch circuit is arranged in the fusion tube body, and the series connection automatic on-off branch circuit is configured to have the following electrical characteristics that the series connection automatic on-off branch circuit is in an on state under an alternating current operation working condition and is in an off state under a direct current test transmission working condition; and the gradient potential transition and shielding integrated structure is arranged at the connecting end part of the series automatic on-off branch and the fusion tube body. An integrated shielding structure of a curved surface equipotential ring, a shielding cup and a conductive gradient coating is constructed at the end part of a fusion tube, and a continuous and controllable potential gradient is formed in a three-dimensional space by utilizing a potential transition layer, so that end part electric field distortion caused by introduction of a series automatic on-off branch is effectively eliminated; and the local field intensity peak value is obviously reduced, and the local discharge initial voltage is improved, so that the aging rate of the insulating medium is greatly delayed.

The present invention belongs to the field of transformer packaging technology, and specifically relates to a high-frequency transformer and its packaging method and use. The packaging method is as follows: placing high-frequency transformer accessories in a mold, filling the mold with packaging material, curing, demoulding, cooling to room temperature, and performing temperature treatment; wherein the temperature treatment is performed in any of the following ways: way 1: cooling to -30 to -20 ° C and holding for 1 -24 hours, heating to -10 to -10 ° C and holding for 1 -24 hours, heating to 80 to 120 ° C and holding for 1 -72 hours; way 2: cooling to -30 to -20 ° C and holding for 1 -24 hours, heating to 80 to 120 ° C and holding for 1 -72 hours; way 3: heating to 80 to 120 ° C and holding for 1 -72 hours; way 4: heating to 80 to 120 ° C and holding for 1 -72 hours, cooling to -30 to -20 ° C and holding for 1 -24 hours. The packaging method provided by the present invention performs temperature treatment after curing is completed, which can redistribute the stress in the high-frequency transformer, reduce the electric field distortion caused by stress concentration, reduce partial discharge, and is suitable for the packaging of high-frequency transformers.

The invention discloses insulating rubber for high-voltage direct-current cable accessories and a preparation method of the insulating rubber, and relates to the technical field of high-voltage direct-current cables. The insulating rubber comprises ethylene propylene diene monomer, a vulcanizing agent, a reinforcing filler, a softening plasticizer, an anti-aging agent, a vulcanizing aid, a resistance regulator and a heat conduction enhancer, and on the premise that the insulativity, the mechanical property and the manufacturability of the rubber material are met, the heat conduction coefficient of the insulating rubber material is increased by adding the heat conduction enhancer; meanwhile, the resistance regulator is added to regulate the change trend of the volume resistivity of the insulating rubber material when the temperature changes, and is synchronous with the change trend of the cable insulating body XLPE, so that discharge breakdown caused by product interface electric field distortion due to temperature rise is avoided, the fault occurrence rate is reduced, and the insulating rubber material is expected to be popularized and used. The preparation method of the insulating rubber is simple and suitable for large-scale industrial production.

The invention discloses a direct-current cable factory joint insulation interface space charge suppression method based on electric field induction, and belongs to the technical field of cable insulation. The method comprises the following steps: heating a polymer insulating material to a molten state, injecting the polymer insulating material into a mold and pouring the polymer insulating material on an insulating surface of a cable body; an external electric field of 0.1-2 kV / mm is applied in the process of recovering insulation formation, and cooling is conducted at the speed of 0.1-10 DEG C / min after heat preservation induction; and when the temperature of the mold is reduced to 25-50 DEG C, the electric field is removed, and the factory joint with the interface space charge suppression performance is formed. The invention also relates to a direct-current cable factory joint structure prepared by adopting the method and a preparation device of the direct-current cable factory joint structure. According to the method, the interface structure between the recovery insulator and the body insulator is adjusted by applying the electric field, so that charge accumulation is effectively reduced, electric field distortion is reduced, and the electrical performance and reliability of the cable factory joint are improved. The method has the advantages of simple process, high controllability and easiness in practical engineering application.

This invention provides a method for intelligent monitoring and early warning of water droplet impact in substations during rainy weather, relating to the field of intelligent operation and maintenance and condition monitoring of substations. The method includes: acquiring dual-optical-path video streams; constructing a cross-spectral neural radiation field network; using joint high-dimensional features as input to output volume density and radiation color vectors; calculating the equivalent water film thickness from these two vectors to generate an equivalent water film thickness distribution field; mapping this field to a three-dimensional model, subdividing the mesh according to the thickness gradient modulus, and solving for the electric field to obtain the electric field distortion tensor and calibrate the high-discharge-risk critical region; generating a Lagrange particle set, solving the dynamic equations through smooth particle hydrodynamics, and simulating the water film evolution to obtain the probability of conductive water bridge connection; inputting the distribution field, distortion tensor, and connection probability into a multi-modal impedance reconstructor to generate an electrochemical impedance spectrum to obtain the dynamic insulation margin attenuation rate; and triggering an early warning based on the determined conditions. This invention significantly improves the timeliness and accuracy of early warning for external insulation faults during rainy weather.

The invention discloses a surface graphite coating method based on a high-voltage cable, and relates to the technical field of high-voltage cable coating, and the method comprises the steps: collecting liquid film dynamic, negative pressure dynamic and tension dynamic features in a liquid film leveling stage, constructing a dynamic feature vector, and extracting a gravity backflow factor; analyzing the negative pressure fluctuation frequency spectrum, judging a bubble nucleation stable stage, and establishing a coupling correlation model of bubble nucleation frequency and coating migration; establishing a critical failure criterion based on the coupling model and the gravity backflow factor, and outputting a distortion sensitivity coefficient and a cavitation breakdown rate of electric field distortion; and finally, constructing a grade division matrix, determining a regulation and control priority and formulating a targeted optimization strategy. According to the method, through feature monitoring, coupling modeling and hierarchical regulation and control, the coating thickness deviation and the bubble residual rate are reduced, electric field distortion is reduced, and the quality stability and operation reliability of graphite coating of the high-voltage cable are improved.

The utility model provides a vacuum arc-extinguishing chamber with an insulating ceramic ring, which relates to the technical field of vacuum arc-extinguishing chambers and comprises a moving end conducting rod, a static end conducting rod, a moving contact, a static contact, a moving end cover plate, a corrugated pipe, a corrugated pipe shielding cover, a main shielding cover, an insulating ceramic shell, a moving end shielding cover, a static end cover plate and a static end shielding cover. When the vacuum arc-extinguishing chamber is switched on, current between the static contact and the static end metal shielding cover is isolated, electric field distortion generated by the static end cover plate is prevented, electric field optimization is facilitated, meanwhile, the advantages of good heat dissipation, high mechanical strength and the like of the metal cover plate are reserved, and the structure design is reasonable.

This invention relates to the field of polymer dielectric materials and discloses a cyclic olefin copolymer / anthracene composite dielectric film for high-temperature energy storage, comprising 100 parts by weight of a cyclic olefin copolymer and 0.2 to 1.0 parts by weight of anthracene. The anthracene is uniformly dispersed in the amorphous network interstices of the cyclic olefin copolymer, utilizing the energy difference between their lowest unoccupied molecular orbitals to construct deep trap sites. By capturing free carriers injected at the electrode interface under high temperature and strong electric field conditions, electron migration is restricted, thereby blocking leakage conduction paths within the bulk phase of the material. This invention effectively reduces Joule heat accumulation during charge transport, improves the high-temperature withstand voltage and insulation reliability of the film, while maintaining relatively low dielectric loss. This all-organic blend system avoids local electric field distortion caused by inorganic filler agglomeration, and the preparation process is simple and mild, facilitating large-scale engineering applications.