48 results about "Electric field computation" patented technology

The invention discloses a dynamic simulation method and system for the opening and closing process of an SF6 circuit breaker, and relates to the technical field of SF6 circuit breaker performance analys.The method comprises the steps that an arc extinguish chamber simulation model is built according to actual parameters of an arc extinguish chamber of the SF6 circuit breaker, and no ablation point is arranged in a contact area in the arc extinguish chamber simulation model; and carrying out dynamic simulation calculation on the opening process of the SF6 circuit breaker by utilizing the laminar flow field calculation model, the electric field calculation model, the pre-breakdown criterion of the arc extinguish chamber, the contact moving grid calculation model of the arc extinguish chamber and the set boundary conditions and combining with the arc extinguish chamber simulation model. According to the method, the laminar flow field calculation model is combined to perform dynamic simulation calculation on the opening process of the SF6 circuit breaker, and the flow characteristics of the SF6 gas in the SF6 circuit breaker are considered in the process, so that the obtained first dynamic simulation result is more fit with the actual opening process of the SF6 circuit breaker, and more accurate data support is provided for optimizing design parameters of the SF6 circuit breaker.

The invention relates to a neural network-based high-voltage live-line work safety early warning method. The method comprises the following steps of 1, establishing a high-voltage transmission line electric field calculation model by using a surface charge method; 2, establishing an overall three-dimensional model of the transformer substation; 3, constructing a signal processing circuit of the power frequency electric field sensor, capturing electric field information in real time through the power frequency electric field sensor, and converting the electric field information into a processable electric signal; 4, real-time data from the power frequency electric field sensor are received, feature extraction and classification are carried out by adopting an early warning method based on a convolutional neural network, and potential safety hazards are identified; 5, establishing a neural network-based high-voltage live working safety early warning comprehensive platform integrating data acquisition, processing, analysis and early warning; the method has the advantages that the neural network algorithm is adopted, the distance and the azimuth angle are accurately judged, live-line work is early warned, and the accident rate is greatly reduced.

The invention relates to an alternating current GIS insulator metal particle inhibition method based on surface fluorination, which changes the surface appearance of an insulator and the surface electric field distribution of an insulating material under an alternating current electric field by performing fluorination modification treatment on the surface of the insulator so as to regulate and control the motion behavior of charged particles around the insulator. Through electric field calculation and stress analysis, the motion characteristics of metal particles near the insulator are simulated, the metal particles with different particle sizes are released at different positions of the inner surface of the GIS grounding shell, the change of the motion characteristics of the metal particles is evaluated, and the fluorinated insulator effectively inhibits the activity of the metal particles and inhibits the adsorption effect of the insulator on the nearby metal particles. The method can effectively inhibit the insulator in the GIS from adsorbing nearby metal particles, prevents insulation failure accidents, improves the reliability and stability of high-voltage electrical equipment, and has the advantages of simple operation process, industrialization, easy realization, universality and the like.

The present invention discloses an electric field calculation method for an atomic gas chamber based on Rydberg atom electric field measurement in the field of atomic measurement devices, comprising the following steps: S1: Construct a model of an electric field loading device, and calculate the electric field strength E between the electrode plates through the electric field calculation formula E = U / d in a uniform electric field; S2: Calculate the polarization charge density P of the glass atomic gas chamber under the action of the electric field; S3: Calculate the polarization charge Q2 in the glass material; S4: Combine steps S2 and S3 to calculate the electric field strength E0 generated by the polarization charge Q2 of the glass material; S5: Subtract the electric field strength E0 generated by the polarization charge Q2 of the glass material from the electric field strength E between the electrode plates to obtain the precise electric field strength E1 inside the glass atomic gas chamber. The beneficial effect of the present invention is that by calculating the electric field strength between the electrode plates and the electric field strength generated by the polarization charge in the atomic gas chamber material, and subtracting the two, the precise electric field strength inside the atomic gas chamber can be obtained.

This application provides a simulation system and method for the AC characteristics of vacuum diodes based on a physical information neural network, belonging to the field of numerical simulation technology for electronic devices. The system includes a particle injection module, a particle deposition module, a Poisson equation solving module, an electric field calculation module, and a particle propulsion module. The particle injection module continuously injects electron particles; the particle deposition module maps particle information to a grid and calculates the electron density; the Poisson equation solving module uses a physical information neural network method to solve for the potential distribution based on the electron density; the electric field calculation module obtains the spatial electric field; and the particle propulsion module updates the particle velocity and position, forming a self-consistent coupled simulation. This application achieves continuous and smooth potential solutions through hard constraint embedding of boundary conditions, two-stage optimization, and loss scale adjustment mechanisms, reducing grid dependence and improving computational accuracy and efficiency. It is suitable for numerical simulation of vacuum electronic devices, electron beam systems, and space charge transport problems.

The invention discloses a geomagnetic disturbance geoelectric field calculation method based on a block geoelectric structure, relates to the technical field of geomagnetic disturbance geoelectric field calculation, and solves the technical problem of low GIC calculation accuracy in complex geology. According to the method, in a macroscopic scale, a one-dimensional conductivity model is inverted by using long-period magnetotelluric sounding, and a regional structure framework is delimited by combining a geological map, so that the accuracy of a global electrical background is ensured; a three-dimensional electrical structure is constructed through audio magnetotelluric sounding in the mesoscale, a secondary geological unit is recognized, and the problem that a traditional model is insufficient in depicting transverse electrical differences is solved; in the microscopic scale, for a key area, high-density resistivity imaging and a controllable source audio magnetotelluric method are used for capturing a high-conductivity / low-resistance anomalous body, and fine modeling of a local area is achieved; according to the method, the geological complexity is mined through the multi-scale model, so that the calculation precision of the GIC is improved.

The invention belongs to the field of reactors, and relates to a method for designing an equivalent scaling model of an extra-high voltage reactor, which comprises the following steps of: designing and installing an equivalent scaling indirect outgoing line structure comprising an L-shaped equivalent scaling indirect outgoing line ascending flanged base and an equivalent scaling outgoing line device; an equivalent scaling indirect outgoing line ascending flanged base is fixedly installed on the side wall of a reactor oil tank, an online monitoring interface and a sensor are arranged on an equivalent scaling model, and a direct outgoing line sleeve and an indirect outgoing line sleeve are installed on the equivalent scaling model; synchronously correcting the inner diameter and the size of the equivalent scaling wire outlet device according to an electric field simulation result until the safety margin and the electric field intensity are consistent with 1000 kilovolts; according to the electric field calculation result, the thickness of an insulating paperboard and the oil gap size of the equivalent scaling wire outlet device are finely adjusted until the safety margin and the electric field intensity are consistent with 1000 kilovolts. On the premise that the voltage level and fault energy are reduced, fault verification of discharging, heating, burning explosion and the like is achieved, and the effectiveness of the sensor and the installation position is verified.

The invention belongs to the field of electromagnetic field numerical solution, relates to antenna electromagnetic simulation, and particularly provides an error field energy-based grid adaptive encryption method, which comprises the following steps of: modeling a target antenna, introducing corresponding excitation and boundary conditions, determining an adaptive frequency point and a solution frequency band, and establishing an electromagnetic simulation model; secondly, carrying out primary division and finite element electromagnetic simulation calculation on a computational domain by adopting a tetrahedral mesh to obtain an electric field at each element node of the tetrahedral mesh, calculating energy corresponding to an error field on an interface of each element, and carrying out posterior error estimation; and finally, calculating a grid encryption strategy according to a posterior error, including an encryption unit and an encryption size, performing simulation calculation again after encryption, and repeating the process until a solution meets a precision requirement. In conclusion, according to the method, the part, not meeting the constraint condition, of the electromagnetic field solution serves as an error source, corresponding energy serves as posterior error estimation, and grid self-adaptive encryption is achieved.

The application provides a kind of network matching not power operation control system based on three-dimensional point cloud, it is related to image processing technical field, the application carries out geometric analysis to three-dimensional point cloud model, and identifies the high curvature geometric discharge candidate point set;And fusion real-time sensing electric field distribution and air charge density data, for each candidate point calculates critical discharge tendency index to carry out physical risk empowerment;Through weighted density clustering algorithm, the discharge risk source area composed of high-risk points is identified.The system also compares the actual electric field with the theoretical simulation electric field, calculates the electric field topological distortion degree, to find out the hidden faults caused by non-geometric factors.Finally, the system executes the hierarchical safety strategy according to the risk source area level or distortion degree result, such as constructing dynamic safety boundary or implementing fault isolation.The application can detect the explicit and hidden risks comprehensively, and can execute fine safety control, which improves the safety and intelligent level of operation.

The application relates to a method and device for calculating the development process of series vacuum gap breakdown. The method comprises the following steps: constructing a series vacuum gap equivalent circuit model according to a plurality of vacuum gap parallel circuits; determining a flow conductance coefficient of the vacuum gap based on the series vacuum gap equivalent circuit model, plasma parameters of cathode plasma and an electric field calculation model of the vacuum gap; determining a vacuum gap equivalent resistance based on the series vacuum gap equivalent circuit model, a plasma expansion radius of the cathode plasma and the flow conductance coefficient of the vacuum gap; determining a vacuum gap breakdown voltage based on the series vacuum gap equivalent circuit model and vacuum gap breakdown data; and calculating the development process of the series vacuum gap breakdown based on the vacuum gap equivalent resistance and the vacuum gap breakdown voltage. The method can reduce the application risk of the series vacuum gap at high voltage.

The invention discloses a highly-integrated cylindrical surface near-far field transformation rapid calculation method and system, and the method comprises the following steps: S1, determining a mode for carrying out the cylindrical surface near-far field transformation of near-field measurement data, and carrying out the representation through a far-field electric field calculation formula; s2, according to the near-field measurement data, calculating to obtain a weighting coefficient compensated by the probe, performing acceleration processing by using FFT Fourier transform in the calculation process, and substituting the obtained weighting coefficient into a far-field electric field calculation formula to obtain a far-field result of the measured antenna; s3, the phase center of the antenna is obtained through calculation according to the far-field result in the S2, phase deviation caused by the phase center is compensated to the far-field result obtained through calculation in the S2, and finally the accurate far-field result of the tested antenna is obtained. The method comprises the processes of probe compensation, phase center calculation and compensation, FFT acceleration and the like, near-far field transformation simulation calculation of the tested antenna can be powerfully supported, and the accuracy of a calculation result is improved.

The invention discloses a temperature change electric field prediction method and device based on a multi-phase heterogeneous interface, equipment and a storage medium. The method comprises the following steps: acquiring a dielectric property characterization data set; performing electric field distribution calculation based on the dielectric property characterization data set to obtain a temperature change electric field calculation result; performing model construction according to a temperature change electric field calculation result to obtain a temperature change electric field prediction model; and inputting the data of the multi-phase heterogeneous interface material into the temperature-variable electric field prediction model for fitting calculation to obtain a temperature-variable electric field prediction result. According to the method, the temperature change electric field prediction model is constructed based on the dielectric property characterization data set, and then fitting calculation is performed through the temperature change electric field prediction model to obtain the temperature change electric field prediction result, so that high-precision electric field prediction is realized, and the insulation reliability of equipment is improved.

The invention discloses a method for obtaining phase distribution of a plane reflection array antenna based on a multi-target algorithm. The method comprises the following steps: designing a plane reflection array; establishing a near-field electric field calculation model through the parameters of the plane reflection array, and defining a forming target area and a limiting target area; respectively establishing a first target loss function and a second target loss function according to the forming target and the limiting target; an NSGA-III multi-objective optimization algorithm is adopted to carry out optimization solution, a contradictory relation between a forming objective and a limiting objective in a solution set is analyzed based on a Pareto graph, the range of a limiting area is adjusted, and an optimized second objective loss function is obtained; and solving the optimized second target loss function, selecting a Pareto optimal phase distribution scheme in an optimal solution set, designing a reflective array antenna, and verifying a near-field rectangular focal spot generation effect. According to the method, the target is adjusted through a method of improving the loss function, so that a better shaping effect is obtained.

The invention relates to the field of electromagnetic radiation detection, and discloses an electromagnetic radiation absorbed dose detection circuit and method and a portable device, the electromagnetic radiation absorbed dose detection circuit is provided with an electric field voltage conversion module, a low-pass filtering module, a resistance transmission line and a broadband signal receiver which are connected in sequence, and the electric field voltage conversion module is connected with the broadband signal receiver through three sub-conversion modules arranged in a three-dimensional orthogonal structure; three-axis component electric field signals are collected in a radar near field and converted into a plurality of corresponding component voltage signals, each component voltage signal is input into a low-pass filtering module to be filtered, each filtered voltage signal is obtained and sent to a broadband signal receiver through a resistance transmission line to be subjected to electric field calculation, and the electric field is calculated. The corresponding human body electromagnetic exposure specific absorption rate is obtained. According to the invention, the detection of the electromagnetic exposure specific absorption rate of the human body can be effectively realized, the detection precision of the specific absorption rate can be effectively guaranteed, and the detection modes of the electromagnetic exposure specific absorption rate of the human body in a radar near field are diversified.

The invention belongs to the technical field of electric power system electromagnetic field simulation, and relates to an electric field calculation system and method for an offshore flexible straight valve hall. Comprising the following steps that valve hall design parameters are obtained, and the design parameters at least comprise an original drawing, space size information and voltage excitation conditions of electrical equipment; based on the original drawing and the spatial size information, establishing a three-dimensional geometric model containing main electrical equipment in the valve hall; importing the three-dimensional geometric model into a finite element analysis environment, defining the material attribute of each part, and applying a boundary condition corresponding to the voltage excitation condition; and grid division is carried out on the model after the boundary condition is applied, electrostatic field solving calculation is carried out, an electric field distribution result of the internal space of the valve hall is obtained, and the electric field distribution result is output. According to the invention, accurate and efficient simulation of electric field distribution in the complex valve hall is realized.

The invention relates to a DC GIS insulator contour optimization method considering transient reliability. The DC GIS insulator contour optimization method comprises the following steps: defining insulator contour variables based on parameterized curve fitting; calculating a direct current charging electric field based on a partial differential equation; calculating an electric field under the action of tolerable transient voltage based on a partial differential equation; carrying out target optimization modeling; and carrying out optimization solution based on a self-adaptive covariance evolutionary strategy. According to the method, an insulator contour target optimization model taking a basin-type insulator contour variable as a decision variable, taking the weighted sum of the maximum value of the insulator surface electric field intensity under the action of a minimized direct current voltage as a target function, and taking the maximum value of the electric field intensity under the action of polarity inversion and lightning impulse voltage as a constraint condition is adopted; the optimal geometrical shape of the basin-type insulator is solved by utilizing a self-adaptive covariance evolutionary strategy, and the surface electric field intensity of the insulator is reduced to the greatest extent and the insulating property of the insulator is improved on the premise of meeting an allowable value specified by a design criterion and ensuring the transient voltage tolerance reliability.

The application discloses a quick finite difference solution method and system of seismic-electric wave field under different saturations, belongs to the technical field of seismic wave field numerical simulation in geophysical exploration, and comprises the following steps: setting basic parameters of a model, determining water saturation under different depths according to a Van Genuchten model, applying the water saturation to expressions for sound field and electric field calculation, respectively introducing independent time iteration steps, iteratively calculating the numerical values of the sound field and the electric field, extending the sound field calculation result to the electric field time node, obtaining a calculation result, and verifying the calculation result. The application effectively reduces the calculation amount, improves the accuracy and integrity of the seismic-electric wave field calculation, and makes the simulation result closer to the actual physical process.

The invention relates to a mixed absorption boundary electromagnetic wave numerical simulation method, belongs to the technical field of computational electromagnetics, and solves the technical problem that a Mur absorption boundary condition cannot be directly used for a coordinate telescopic medium, and the simulation method comprises the following steps: establishing a mixed absorption boundary electromagnetic wave numerical calculation model; setting CPML (Convolution Complete Matching Layer) parameters; calculating electromagnetic field distribution in the model; calculating a parameter I A, a parameter II B and a parameter III C required by the mixed boundary; calculating the electric field of the boundary of the outermost layer of the CPML; calculating a magnetic field at the next moment; and a step of iteration. The Mur absorption boundary is seamlessly combined with the CPML, and an electromagnetic field in a coordinate telescoping medium is solved by using time domain finite difference FDTD. The method is used for mixed absorption boundary electromagnetic wave numerical simulation in the coordinate telescopic medium.

The invention relates to a method, a system and equipment for calculating an electric field around an ADSS optical cable, and a medium. The model can effectively calculate the electric field distribution around the optical cable by accurately modeling the geometrical shape and stress response of the power transmission line and combining the relationship between the charge density and the electric field. The electric field is solved through a finite element analysis method, a non-uniform division strategy is adopted, the calculation precision is guaranteed, and meanwhile the calculation cost is reduced. According to the equivalent charge method, the calculation process is simplified through virtual charge distribution, and high precision is maintained. The model solves the problems of complex electric field calculation and insufficient precision in the prior art, is widely applicable to electric field analysis and optical cable design of a power system, and provides effective support for safe operation of an ADSS optical cable.

This invention provides a method for optimizing the structure of lightning protection insulators based on surface electric field characteristics, comprising: S1. Modeling the target lightning protection insulator using Solidworks software, wherein the size ratio of the established target lightning protection insulator model to the actual target lightning protection insulator is 1:1; S2. Meshing the target lightning protection insulator model using a local refinement algorithm; S3. Determining the input parameters of the target lightning protection insulator, including rated voltage, metal electrode material, silicone shed material, and zinc oxide valve plate material; S4. Inputting the input parameters of the target lightning protection insulator into the finite element electric field calculation model to calculate indices, including the maximum electric field E along the surface of the insulation section. 1max The maximum electric field E on the surface of the disc electrode 2max The maximum electric field E on the surface of the spherical electrode 3max And determine the coefficient of electric field non-uniformity ξ along the surface of the insulation section. E And the ratio R1 of the maximum electric field value along the surface of the protective electrode and the insulation section; S5. Determine the comprehensive index β1; S6. Determine whether the comprehensive index β1 meets the set index threshold. If so, manufacture according to the predetermined size of the current target insulator. Otherwise, adjust the weight of each index in the comprehensive index β1 calculation model, and adjust the diameter of the spherical electrode, the diameter of the disc electrode, the distance of the protective gap and the extension length of the shed, and return to step S1.

The invention discloses a coercive field calculation method, system, equipment and medium for a ferroelectric material, and relates to the technical field of coercive field estimation, and the method comprises the steps: selecting an initial state and a final state of the ferroelectric material, the initial state being a stable state of the ferroelectric material and the final state being another stable state, or the initial state being a ferroelectric state of the ferroelectric material and the final state being a central symmetry state; generating a polarization flipping path from an initial state to a final state and a continuous inversion path by adopting a minimum energy path method of a first principle; and obtaining a polarization value of each structural point in the continuous inversion path by adopting a dual polarization strategy, determining a maximum energy point according to energy distribution of the structural points, extracting a polarization difference and an overturning potential barrier of a ferroelectric phase and a paraelectric phase, and obtaining a coercive field through a ratio of the overturning potential barrier to the polarization difference. According to the invention, a real polarization flipping path is obtained through a minimum energy path algorithm, and energy distortion and polarization errors possibly introduced by a non-physical linear interpolation path are avoided, so that flipping barriers and polarization evolution are accurately captured.

The invention provides a transcranial magnetic stimulation simulation method under simulated microgravity. The method comprises the following steps: constructing a human head three-dimensional grid model; wherein the parameters comprise low-frequency target electrical characteristic parameters in the corresponding microgravity environment; establishing an electromagnetic simulation model; and determining a tissue area generating effective stimulation based on the model and a threshold value. Through the corrected conductivity, the model can truly reflect brain tissue electrical characteristic changes caused by microgravity, and electric field calculation errors caused by parameter solidification are overcome. And secondly, the nerve activation threshold value suitable for the microgravity environment is determined by fusing the excitability correction coefficients of the cells and the network hierarchy, so that the problem of misjudgment of the stimulation effectiveness caused by reduction of the excitability of the neurons is solved. And finally, through electromagnetic simulation coupled with the adaptive parameters, reliable prediction of induced electric field distribution and an effective stimulation area under a microgravity condition is realized.

The invention provides a bus configuration method for improving magnetic fluid stability of an aluminum electrolysis cell, and relates to the technical field of aluminum electrolysis. The method comprises the following steps: firstly, connecting a bus of the aluminum electrolysis cell, and carrying out networked configuration on cathode buses around the aluminum electrolysis cell; secondly, correspondingly adjusting the section and length of a cathode soft belt of each group of cathode steel bar heads by adjusting the section and direction of each group of cathode buses around the cell, and adjusting the layout and configuration of the cathode buses around the cell connected with each group of upright post buses and short-circuit buses at the same time; ensuring that the value of current flowing out of each group of cathodes of cathode buses around the networked aluminum electrolysis cell and the value of current flowing into each column bus of the next aluminum electrolysis cell are the same as theoretical set values; and finally, an equivalent resistance method and a finite element method are combined for electric field calculation, the reasonability of current distribution of the aluminum electrolysis cell is verified, production fluctuation caused by uneven current is reduced, and therefore the stability and efficiency of the whole aluminum electrolysis production process are improved.

The invention discloses a primary and secondary fusion ring main unit gas tank internal insulation part electric field homogenization optimization method, and relates to the technical field of high voltage switchgear electric field optimization, and the method comprises the steps: building a three-dimensional model containing all insulation parts, independently marking the surface and internal dielectric attributes of each part, and precisely depicting a material interface; and further setting the actual pressure and component proportion of the insulating gas, and applying rated voltage and various transient overvoltage excitation to carry out electric field calculation. Based on the obtained electric field distribution cloud picture, a high-field-intensity area and a specific insulation part and position associated with the high-field-intensity area can be accurately positioned, and an optimization scheme of geometric shape adjustment or dielectric constant gradient adjustment is matched for the position. According to the method, precise identification and targeted optimization of insulation weak points are realized through refined modeling of component attributes and composite simulation of actual working conditions, and the insulation reliability of equipment in a real operation environment is improved.

The application provides an inductance adjusting method and device, an adjustable reactor, a medium and a program product. It relates to the technical field of electric power. The method comprises the following steps: obtaining a working environment and a working frequency of an adjustable reactor; searching for an electric field calculation formula corresponding to the working environment in multiple electric field calculation formulas to obtain a target electric field calculation formula of the adjustable reactor, the electric field calculation formula being used to describe the relationship between dielectric characteristics and the working frequency under the working environment; obtaining a dielectric characteristic parameter of the adjustable reactor according to the target electric field calculation formula based on the working frequency of the adjustable reactor; and adjusting the inductance of the adjustable reactor based on the dielectric characteristic parameter. The application achieves the effect of accurate inductance adjustment.

The invention discloses a multi-factor aging platform based on an electric field optimization multi-needle plate electrode, which belongs to the technical field of aging tests of insulating materials of power systems and comprises an electric field calculation and control system interaction terminal and a controllable electric field dynamic multi-needle plate electrode device. By changing the curvature radius through the two-stage mechanical linear motion structure and the electrode needle made of the memory alloy material, fine adjustment of the uniform electric field containing the stable corona is achieved, the problem that an aging platform in the prior art is poor in actual environment simulation is solved, and the beneficial effects of adapting to various test pieces and dynamically adjusting the surface electric field of the test pieces are achieved.

This invention provides a method for calculating the maximum surface electric field of AC transmission lines based on an optimized simulated charge method. This method uses a quasi-random strategy and first-order forward differencing to determine candidate intervals containing minima, controlling computational convergence and stability. Then, the Brent method is used for local optimum approximation to optimize charge placement, calculating the position parameters and charge quantity of the corresponding simulated charges, and solving for the electric field distribution on the conductor surface. For some difficult-to-measure points and points requiring numerous repeated measurements, this method can reduce the workload and cost of on-site measurements. The aforementioned optimization method reduces the number of high-order matrix operations, lowering potential errors while reducing iterative computation costs, and improving the efficiency and stability of maximum surface electric field calculation.

The invention belongs to the technical field of terahertz wave measurement, and particularly discloses a terahertz frequency and power synchronous measurement device and method.Under the action of terahertz waves and a changing external magnetic field, the magnetization intensity of a sample changes, the sample interacts with ferrite particles to generate gradient force, and a deformable film under the ferrite particles displaces; the data processing unit obtains an external magnetic field and a deformable thin film displacement signal detected by the optical fiber detector in real time when the sample generates an electron spin resonance phenomenon, further obtains the terahertz wave frequency, calculates a terahertz wave transverse magnetic field based on the maximum displacement of the deformable thin film, and combines an electric field at the sample obtained through waveguide impedance to obtain the terahertz wave frequency. And calculating to obtain the power of the terahertz wave. The measurement bandwidth is wide, the frequency and the power of a single terahertz wave can be measured at the same time, and the frequency and the power of a plurality of terahertz waves with different frequencies can also be measured at the same time.

The invention discloses a coil with a concave surface structure for improving the shape of a surface electrode, and particularly relates to the field of transformer manufacturing, the coil comprises a coil, the surface of the coil is of a concave surface structure, and an inner diameter filler strip is arranged in the middle of the coil; the highest potential part of the coil is located in the center of the coil, the inner diameter filler strips are sequentially decreased from the middle of the coil to the ends of the coil to form a concave surface structure of the coil electrode, the higher potential part is located at the bottom of the concave surface, and the lower potential part is located at the top of the concave surface. According to the invention, a coil form with a middle outgoing line is adopted, specific electric field intensity distribution is obtained through electric field calculation, then electric field margins are calculated for different positions, and different insulation distances are respectively given for different potential distributions of the coil according to different electric field margins, so that the surface shape of the coil is close to a concave surface shape, and the insulation margins are increased; the space utilization rate is increased.

The application discloses a near-field antenna measurement method based on phase reduction, and mainly solves the problem that the high-frequency antenna near-field phase is difficult to obtain in the existing antenna measurement technology, and the high-frequency antenna near-field cannot be accurately measured. The implementation scheme is as follows: the amplitude of two planes of the high-frequency antenna near-field is obtained through near-field antenna measurement, the optimal initial phase of the first plane is calculated according to the amplitudes of the two planes by using a global optimization algorithm, and the phase of the first plane of the high-frequency antenna near-field is restored from the optimal initial phase and the amplitudes of the two planes by using an iterative Fourier algorithm; the electric field of the first plane is composed of the amplitude and the restored phase of the first plane, and the far-field pattern of the high-frequency antenna is calculated from the electric field. The phase of the high-frequency antenna is obtained by using the optimization and restoration algorithm, and the measurement is not needed, so that the problem that the antenna near-field phase is difficult to obtain in the prior art is solved, the cost of the near-field antenna measurement is saved, and the method is compatible with the high-frequency and low-frequency antenna measurement, and has strong practicability.