204 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 discloses a differentiated precise current distribution control method in a multi-workpiece batch electroplating process. The method comprises the following steps: acquiring multi-workpiece feature data and preprocessing the multi-workpiece feature data; workpiece difference characteristic analysis and grouping are carried out; modeling and analyzing the electric field distribution of the electrolytic cell; plating layer growth dynamic monitoring and prediction are carried out; and generating a differential current distribution strategy. A multi-frequency differential resistance spectrum acquisition system is adopted to realize real-time monitoring of plating layer growth, an improved independent component analysis algorithm fused with spatial constraint is applied to perform workpiece group resistance spectrum decoupling, and micro-area accurate current modulation is realized through a self-adaptive waveform library of an electric field distortion area. The problems that dynamic characteristics of plating layers are difficult to monitor and differentiation control of workpieces with similar characteristics is insufficient in multi-workpiece electroplating are solved, and the quality consistency of the plating layers is improved.

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 a bird-related fault identification and early warning method based on a transmission tower gap model, and relates to the technical field of power system safety monitoring. The method comprises the following steps: firstly, constructing a three-dimensional transmission tower gap model containing a local insulated armor, and obtaining an electric field distortion feature library under various working conditions through finite element simulation; further simulating interference behaviors of the bird body, the bird nest and the excrement in the safety gap, calculating the discharge probability, and synthesizing and labeling a bird image for training a risk decision model. And in combination with a target detection algorithm integrating an attention mechanism and an SPPCSPC module, space coordinates of bird targets are extracted in real time and mapped to a high-risk area, and a discharge risk score and a breakdown trend index are output by using an LSTM network. And when the risk index exceeds a dynamically adjusted early warning threshold, generating an early warning signal and a fault coordinate. According to the invention, the precision and foresight of bird-related fault identification are improved, and the method has good engineering adaptability.

The invention discloses a power transmission line corona discharge risk analysis method, device and equipment, and relates to the field of power transmission line safety analysis, and the key points of the technical scheme are as follows: establishing a dielectric model for representing the polarization characteristics of different types of bird nests on a power transmission tower, and calculating the power transmission line corona discharge risk based on the weighted sum of the dielectric model; obtaining a first mathematical model used for describing bird nest polarization characteristics, and introducing an environment correction factor of the power transmission line to correct the first mathematical model to obtain a second mathematical model; determining the polarization intensity of different types of bird nests on the power transmission line according to a second mathematical model; correcting the initial corona field intensity of the power transmission line containing the bird nest according to the electric field distortion rate and the polarization intensity to obtain the corrected initial corona field intensity; and constructing a corona discharge probability model according to the corrected initial corona field intensity, the electric field distortion rate and the polarization intensity, and analyzing the corona discharge risk of the power transmission line based on the corona discharge probability model.

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 method for analyzing a space electric field with an internal and external energy-taking capacitor of a pole-mounted circuit breaker, and relates to the technical field of pole-mounted circuit breaker analys.The method comprises the steps that a finite element simulation model is constructed based on the structure of the pole-mounted circuit breaker and simulation equipment, and the finite element simulation model is closer to the actual structure; acquiring first electric field distribution data and the position of a target element based on the finite element simulation model, and drawing a first tangent plane electric field based on the position, the first electric field distribution data, the material data of the pole-mounted circuit breaker and the boundary condition of an electrostatic field, obtaining an electric field concentration position and an electric field distortion point based on the first electric field intensity of the tangent plane electric field, constructing a three-dimensional section line based on the electric field concentration position and the electric field distortion point, analyzing the electric field based on the three-dimensional section line, and obtaining an analysis result. And electric field distribution in the pole is influenced, so that electric field distortion is caused.

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 provides a composite insulator electric field distortion detection method based on an electroluminescent effect, and the method comprises the steps: firstly, employing silicone rubber as a matrix material, optimizing a formula and a preparation technology, and preparing an electroluminescent composite coating material which is highly sensitive to electric field intensity and has excellent adhesiveness and environmental stability; secondly, the unmanned aerial vehicle is used for carrying a high-resolution camera, and comprehensive and clear insulator surface images are obtained in combination with the optimized route design; then, multivariable regression prediction is performed on image data through an algorithm, local and global characteristics of electric field distribution are accurately captured, and modeling errors are reduced. And finally, comparing an actually measured electric field distribution curve with a theoretical curve, analyzing electric field distortion, and diagnosing potential defects by using a feature matching technology. According to the invention, high detection accuracy can be maintained in different environments, the efficiency and precision of electric field distribution detection are greatly improved, and reliable technical support is provided for maintenance and safe operation of power equipment.

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 state optimization method of a solid-sealed polar pole for a primary and secondary fusion circuit breaker. The invention aims to solve the problem of circuit breaker misoperation caused by a traditional fixed threshold criterion. According to the method, the temperature gradient, the mechanical vibration frequency, the strain distribution and the electric field intensity data of the solid-sealed polar pole are collected in real time through a multi-physics field coupling monitoring network, and the comprehensive degradation index (CDI) is constructed by combining spatial-temporal feature extraction of partial discharge signals. The feature weight is dynamically optimized by adopting an improved particle swarm algorithm, the degradation trend is predicted through a bidirectional long-short-term memory network (LSTM), and a dynamic early warning threshold value (DWT) and a critical threshold value (CWT) are generated. Efficient data processing and model iterative optimization are realized, and meanwhile, mechanical strain, electric field distortion and a discharge evolution path are visualized through a three-dimensional digital twin model. Actual measurement shows that the fault misjudgment rate is reduced to be lower than 5%, the early warning response time is shortened to be within 10 seconds, and the local discharge capacity is greatly reduced through the silver nanowire self-healing technology.

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 utility model discloses a high-power high-voltage power supply supporting device and a high-power high-voltage power supply system. A plurality of high-power high-voltage power supplies are arranged in a hollow insulating bracket; the bracket shielding ring is used for performing electric field optimization on the hollow insulating bracket; the plurality of bracket shielding rings are arranged on the surface of the hollow insulating bracket; the insulation output module is used for insulating the output end of the high-power high-voltage power supply; on the basis of a traditional high-power high-voltage power supply supporting device, structural improvement is carried out, electric field optimization is carried out on the edge of the power supply supporting device by installing the support shielding ring, and the electric field distortion degree is reduced; meanwhile, the insulation output module is additionally arranged to insulate the output end of the high-power high-voltage power supply, and the purpose of reducing electric field distortion is achieved.

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 field of semiconductor ceramic preparation, in particular to tin-antimony gradient doped insulating semiconductor glaze and a low-temperature sintering process thereof. The gradient change of the element doping amount per unit volume from the inner layer to the surface layer of the glaze layer is formed through different treatment processes of the tin-antimony solid solution, and compared with traditional uniform doping, the surface electric field distortion rate can be effectively reduced, and the surface pollution flashover voltage can be improved. According to the invention, a composite fluxing agent system is adopted, the sintering temperature is reduced, segmented differential atmosphere sintering is adopted to ensure the structural compactness of the glaze layer, excessive loss of doped elements at high temperature is avoided, and the overall performance of the glaze layer is improved. According to the invention, the surface photocatalytic material is doped and forms a heterojunction structure with the internal doped material after sintering, so that relatively strong surface light cleaning performance is formed, and the probability of pollution flashover is reduced.

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 crosslinked polyethylene cable has good performance and is widely applied to the fields of power grids and the like. Due to the action of long-time power frequency voltage, a cross-linked polyethylene cable insulating layer generates microdefects, and the water tree aging phenomenon is prone to occurring. Wherein some water branches gradually derive into electric branches under the action of a high-frequency electric field or overvoltage, so that electric field distortion is caused, and finally, a cable insulating layer is broken down. An existing microcapsule type self-repairing material is prone to agglomeration in a matrix, and the performance of the existing microcapsule type self-repairing material is greatly different from that of a matrix material, so that the performance of the self-repairing material is greatly reduced, and the repairing efficiency of a water tree is affected. Therefore, it is necessary to develop a multi-layer shell-core microcapsule / crosslinked polyethylene water tree self-repairing material modified by the plasma cooperating with the coupling agent, and a method for prolonging the service life of an insulating material is fundamentally explored.

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 a heat-conducting intelligent insulating material with nonlinear volt-ampere characteristics, a preparation method and application thereof, and belongs to the technical field of insulating materials. The intelligent insulating material comprises a polymer matrix and a SiC nanofiber felt in the polymer matrix, the volume fraction of the SiC nanofiber felt is 0.5%-2% of that of the polymer matrix, and the SiC nanofiber felt is formed by stacking and assembling SiC nanofibers which are approximately in the same direction; the SiC nanofibers are arranged in parallel or vertically in the polymer matrix. According to the scheme provided by the invention, the heat conduction path of the intelligent insulating material can be optimized, the high heat conduction and nonlinear volt-ampere characteristics of the material are considered, the problem of low heat dissipation efficiency of the packaging material is solved, and the composite material is endowed with low-field-insulation and high-field-conduction electric field self-adaptive regulation and control capability through the nonlinear volt-ampere characteristics; and the problem of aging breakdown when the composite material is faced with an electric field distortion phenomenon is relieved.

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.

The invention discloses a method and a system for checking potential safety hazards of power transformation equipment, particularly relates to the technical field of intelligent operation and maintenance of power equipment, and is used for solving the problem of hidden operation risks caused by mismatching of equipment aging characteristics and generalization strategies in the prior art. The method comprises the following steps: acquiring multi-source operation state data of power transformation equipment, constructing an asynchronous data set, and dynamically identifying a spatial electric field distortion gradient and a contact resistance fluctuation quantity as abnormal parameters; differentiated weight distribution is carried out on the abnormal parameters based on equipment structure features, and risk levels of different regions are quantified; analyzing the time sequence relevance between the contact resistance and the electric field response, and judging the breakdown risk caused by insulation degradation; a maintenance period optimization scheme and electric field compensation parameters are generated in combination with risk levels, an aging model is dynamically updated based on execution feedback, early warning and accurate intervention of hidden dangers are realized through dynamic adaptation of equipment states and control strategies, and the problem of control mismatch caused by neglecting of material degradation characteristics in a traditional method is effectively solved.

The invention discloses a gradient fluorination and drying method for a high-voltage direct-current wall bushing, which comprises the following steps of: controlling the volume ratio of fluorine gas to inert gas and fluorination pressure to finish gradient fluorination on the inner wall of epoxy resin of the wall bushing in an early stage, a middle stage and a later stage, then performing gradient drying in three stages, and pre-assembling with a dried metal part, thereby obtaining the high-voltage direct-current wall bushing. And after the pre-assembly is completed, hot air drying is performed, and SF6 (sulfur hexafluoride) gas is filled for packaging, so that the high-voltage direct-current wall bushing with improved performance is obtained. The method effectively solves the problem of DC breakdown voltage drop caused by charge accumulation and electric field distortion in long-term operation of the high-voltage DC wall bushing, and can solve the problem of construction of a uniform and compact fluorination reaction layer on the inner wall of the bushing, and solve the problem of large thickness uniformity deviation of the fluorination inner wall. The insulation performance of the high-voltage direct-current wall bushing is remarkably enhanced, and powerful technical support is provided for application of a fluorination technology in the field of insulation optimization of power equipment.

The invention provides a zero-value insulator detection method for a direct-current ultra-high-voltage power transmission line. The method comprises the following steps: acquiring an infrared image of the direct-current ultra-high-voltage power transmission line; if the infrared image is abnormal, acquiring an ultraviolet image; if the ultraviolet image has the abnormal discharge characteristic, determining that a zero-value insulator and a corresponding potential abnormal region exist; performing ultrasonic detection on the potential abnormal region to obtain an ultrasonic signal; if abnormal signals exist in the ultrasonic signals, electric field distribution analysis is carried out on the direct-current ultra-high-voltage power transmission line; and if electric field distortion exists in the electric field distribution of the direct-current ultra-high-voltage power transmission line, determining that a zero-value insulator exists, and generating a zero-value insulator detection report of the direct-current ultra-high-voltage power transmission line. According to the invention, the zero-value insulator can be accurately identified and positioned, and the detection efficiency of the zero-value insulator is improved. The invention further provides a zero-value insulator detection system of the direct-current ultra-high-voltage power transmission line, a computer readable storage medium and electronic equipment, which have the above beneficial effects.

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 invention discloses a high-voltage pulse liquid electric rock breaking device, which relates to the technical field of well drilling, and comprises a main body structure comprising transformer oil, and an insulating cylinder, a cylinder body and a drill rod which are connected in sequence, the top of the cylinder body is open, the top of the cylinder body is in threaded connection with the bottom end of the insulating cylinder, and a cavity is formed between the bottom end of the insulating cylinder and the inner wall of the cylinder body; the transformer oil is filled in the cavity; the first high-voltage electrode stem is vertically arranged in the insulating cylinder in a penetrating manner, and the bottom end of the first high-voltage electrode stem extends into the cavity; the second high-voltage electrode rod is sleeved with the drill rod, the top end of the second high-voltage electrode rod extends into the cavity, the bottom end of the second high-voltage electrode rod is connected with a drill bit, the drill bit extends out of the drill rod, and the second high-voltage electrode rod and the first high-voltage electrode rod are connected into a homopolar high-voltage power source. The method has the advantages that the uniformity of electric field distribution is improved, and the problem of electric field distortion is avoided.

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.