43 results about "Soil resistivity" patented technology

The invention discloses a fan blade lightning protection design method and system based on fan grounding resistance, and the method comprises the steps: analyzing a set grounding impedance model, and selecting a most suitable grounding impedance model; designing a fan grounding device according to the most suitable grounding impedance model; optimizing the grounding electrode according to the soil resistivity; based on a target of efficiently guiding and transmitting thunder and lightning, determining materials of a fan blade, a lightning protection lightning arrester and a down lead; through setting a connection mode, the lightning protection lightning arrester, the downlead, the blade root and the fan grounding device are firmly connected in pairs; according to the parameters of the fan blade and the potential difference between the fan blade and the ground, the electric field intensity in the fan blade during lightning stroke is calculated; and optimizing and adjusting the fan blade according to the electric field intensity. The fan blade can be protected from being struck by thunder and lightning, and damage to equipment and personnel is reduced.

The invention provides a pumped storage power station differential grounding platform setting method and system and electronic equipment, and the system comprises a space-time multi-physics field feature description module which is used for collecting multi-source heterogeneous data of the whole field domain of a pumped storage power station, and a four-dimensional geoelectric structure model capable of reflecting soil resistivity space distribution and time dynamic change is constructed through the data, and a grounding short circuit fault risk distribution diagram of the whole field domain is generated according to the model and a preset short circuit current level. According to the method, the four-dimensional geoelectric structure model is constructed, so that too simplified homogenization and static assumptions in traditional design are abandoned fundamentally, the real physical environment of the complex site of the pumped storage power station can be scientifically represented with unprecedented precision and dimensionality, and a solid data and physical model foundation is laid for subsequent precise design.

The utility model discloses a split-type grounding electrode and a carbon fiber composite complete grounding device, the split-type grounding electrode comprises a grounding tip and a plurality of solid graphite grounding rods, the plurality of solid graphite grounding rods are connected end to end in series, the tail end of the solid graphite grounding rod at the rearmost end is connected with a copper movable hammer, and the tail end of the solid graphite grounding rod at the rearmost end is connected with a carbon fiber composite grounding device. The movable hammer head comprises a first belt penetrating channel and a second belt penetrating channel which are vertically arranged side by side. The complete set of grounding device comprises a grounding down lead, a carbon fiber composite graphite blanket, a carbon fiber composite graphite belt, a connector and a grounding module. The grounding electrode provided by the utility model is provided with the detachable movable hammerhead, and the movable hammerhead can be quickly connected with the graphite belt, so that the construction is convenient. The grounding electrode is combined with a carbon fiber composite graphite belt / blanket, a multi-dimensional conductive network is formed by using high conductivity of carbon fibers and excellent ionic conductivity of graphite, the diffusion efficiency is effectively improved, and the carbon fiber composite graphite belt / blanket is especially suitable for regions with high soil resistivity.

The invention relates to the technical field of gas meter controller testing, in particular to a wireless communication intelligent gas meter controller and a control method thereof. Comprising a microprocessor, an electrochemical corrosion monitoring module, a soil resistivity acquisition device, a stray current monitoring unit, a wireless communication unit, a metering unit and an anti-corrosion regulation and control unit, the signal output ends of the electrochemical corrosion monitoring module, the soil resistivity acquisition device and the stray current monitoring unit are respectively and electrically connected with the signal input end of the microprocessor; the control output end of the microprocessor is respectively and electrically connected with the control input ends of the wireless communication unit, the metering unit and the anti-corrosion regulation and control unit; the electrochemical corrosion monitoring module is used for collecting hydrogen sulfide concentration, relative humidity and environment temperature parameters, converting analog signals into digital signals and transmitting the digital signals to the microprocessor. The system can cope with the coupling influence of multiple environment factors in a cooperative mode.

The invention discloses a system and a method for in-situ measurement of thermodynamic electrical parameters of a rock-soil body. The system comprises an in-situ detection probe, a data acquisition instrument, a penetration assembly for connecting the in-situ detection probe and the data acquisition instrument, and a data analysis platform connected with the data acquisition instrument, the in-situ detection probe comprises a CPTU static sounding probe, a four-phase pole resistivity probe, a heating probe inserted into a hollow cylinder of the four-phase pole resistivity probe, and an adapter connected with the CPTU static sounding probe and the four-phase pole resistivity probe; the four-phase electrode resistivity probe comprises a hollow metal shell, and an insulating material, a voltage electrode and a current electrode are arranged on the outer ring of a cylinder at intervals. During testing, the resistivity of the soil body is firstly tested, then the heating wire is electrified and heated, and the four-phase pole resistivity probe is used as a temperature sensor of the heating probe, so that synchronous testing of soil layer classification and thermodynamic electrical parameters of the rock-soil body is realized. The invention further provides a column heat source-parameter estimation method for thermal parameter testing, and the testing accuracy is remarkably improved.

The present invention discloses a method for detecting leakage in a solid waste landfill, comprising a plurality of pre-buried electrodes. The pre-buried electrode array is buried in the soil surrounding the landfill area, and the soil resistivity between adjacent pre-buried electrodes is used to identify whether there is a leak along the path. The pre-buried electrodes include hollow balls and wires. The detection device also includes a pipe system and a suction pump. The pipe system includes a main pumping pipe, a main water supply pipe, a plurality of flow pipes, and a branch valve. The hollow balls are buried in the soil surrounding the landfill area. The inner cavity of each hollow ball is connected to a flow pipe. The end of each flow pipe away from the hollow ball is connected to the main pumping pipe and the main water supply pipe in the form of a branch pipe. The branch pipes are respectively provided with a branch valve. One end of the main pumping pipe is connected to the suction pump inlet, and the main water supply pipe is connected to the water supply source. The surface of the hollow ball is provided with a plurality of flow holes. The hollow ball is conductive and connected to an external DC power supply via a wire. When the hollow ball is connected to the negative electrode via the wire, the hollow ball is connected to the main pumping pipe via the flow pipe.

The invention discloses a power grid grounding simulation method and system based on multi-parameter coupling modeling. The method comprises the following steps: acquiring soil resistivity, lightning stroke current waveform data and morphological structure information of a grounding electrode at different depths and geographic positions; constructing a recursive coupling current equation based on time history feedback, and recursively calculating a local grounding current distribution function at the current moment and at the spatial position by adopting a multi-channel dynamic weighting mechanism based on the recursive coupling current equation; fractal dimensions are dynamically calculated according to the soil resistivity and the morphological structure information of the grounding electrode, and a fractal current distribution function is established based on the fractal dimensions and a local grounding current distribution function; the local current value and the fractal current distribution function are fused, the total grounding current is dynamically calculated in a time integration mode, and step voltage is calculated in combination with a current response function, the soil resistivity and the lightning stroke waveform; and determining the state of the grid grounding system based on the total grounding current and the step voltage.

The invention relates to the field of substation monitoring, in particular to a system for monitoring the state of a substation grounding grid. The system comprises a multi-source data acquisition module, a relay polling unit and a control unit. The multi-source data acquisition module monitors the backflow condition, the electrical integrity, the grounding resistance value of an earth screen, the soil resistivity, the contact voltage, the step voltage data, the corrosion rate of the earth screen, the corrosion amount and the soil PH value; the relay polling unit comprises a relay input control module and a relay output control module, and the relay output control module drives multiple relays to switch test loops according to a fixed sequence; the control unit displays the backflow condition, the electrical integrity, the earth screen grounding resistance value, the soil resistivity, the contact voltage, the step voltage data and the alarm information in real time, displays the earth screen corrosion rate, the corrosion amount and the soil PH value, and is integrated with a central processing unit. The state of the transformer substation grounding grid can be comprehensively and intelligently monitored in real time, and the abnormal trend can be analyzed and early warned.

The invention discloses a voltage test curve determination method and device, terminal equipment and a building site selection safety judgment method based on a voltage test curve, and belongs to the field of electrical engineering. The method comprises the following steps: obtaining structural parameters of a test building, structural parameters of a grounding grid around the test building and soil resistivity of soil where the grounding grid around the test building is located; constructing a simulation model according to the structural parameters and the soil resistivity; external excitation is applied to the simulation model, so that the simulation model to which the external excitation is applied simulates to obtain voltage values of a preset reference earth surface point under different test parameter combinations; and according to the voltage value and the test parameter combination corresponding to the voltage value, fitting to obtain a voltage test curve for representing the change of the voltage along with the test parameters. By implementing the application, the problem that the area voltage distribution rule of the building land occupation, the building and the surrounding grounding grid layout is not clear in the prior art can be solved.

The invention discloses a method for predicting and evaluating corrosion fatigue residual life of an oil pipeline, and belongs to the technical field of structural integrity management and safety engineering of oil and gas conveying pipelines. Comprising the following steps: acquiring pipeline corrosion defect original data, carrying out defect merging and identification to obtain a defect sample set, selecting a target defect sample, and obtaining the defect depth of the target defect sample at the detection moment; based on the defect sample set, statistical modeling is carried out on the corrosion defect depth, the maximum defect depth in a preset service period is obtained through prediction, and safety margin evaluation is carried out; constructing an electrochemical corrosion life model fused with a temperature-soil resistivity correction factor to predict the residual life; and carrying out pipeline residual strength evaluation and decision making by adopting an optimized ASME B31G standard and an SY / T 6151 standard. According to the method, all links are seamlessly connected, a complete solution from theory to practice and from technology to economy is provided, the operation and maintenance cost is effectively reduced, and the pipeline safety management level is improved.

The utility model discloses a kind of transmission tower intelligent analyzers with ground net welding point detection function, including transmitter and receiver, the transmitter is used to apply alternating current to ground net ray, one end is connected with ground stake, the other end is connected on ground net ray exposed joint;The receiver includes receiving antenna, signal analysis module, display screen, main control module, button, high-precision RTK and gyroscope. The analyzer has basic grounding resistance detection, soil resistivity detection and concealed ground net detection, real-time display ground net trend, while having the industry first ground net welding point detection function, effectively reduce the loss of manpower and material resources caused by blind excavation ground net. The equipment overall structure is simple, portable, easy to use, powerful, with greater practical value.

This invention relates to the field of electromagnetic compatibility technology in power systems, and more particularly to a rail position control and suppression system based on multi-objective optimization. The invention generates a target potential distribution prediction scheme through a potential distribution prediction generation module, which then corrects the scheme using a spatial calibration unit based on real-time train position offset to generate spatial dynamic correction coefficients. The spatial optimization unit then optimizes the scheme based on historical soil resistivity drift data. Simultaneously, a target drainage action timing scheme is generated through a timing scheme generation module, corrected by a timing calibration unit based on real-time rail potential deviation to generate timing dynamic correction coefficients, and then optimized by a timing optimization unit based on historical equipment performance data. Finally, a comprehensive point-based control module achieves coordinated spatial and temporal control.

The application relates to an optimization design method of a grounding resistance of a transmission line tower based on a particle swarm optimization algorithm, which comprises the following steps: based on a control index of a transmission line back strike trip-out rate and an engineering implementation efficiency requirement of tower grounding design, constraint conditions and a target function in the optimization design of the grounding resistance of the transmission line tower are refined; particle swarm optimization algorithm parameters are set, a random initial particle swarm is generated by using the particle swarm optimization algorithm, in an iteration process, the position and speed of the particle swarm are updated according to the historical optimal value of the particle and the historical optimal position of the particle swarm, so that a global optimal solution is searched; and the global optimal solution is converted into soil resistivity grading and a grounding resistance value, which is used as an optimization design scheme of the grounding resistance. The application can guarantee that the grounding resistance value does not need to be designed too small, the cost of the grounding resistance is reduced, the proportion of a local total back strike trip-out rate exceeding the back strike trip-out rate control index is minimum, and the trip-out rate of the transmission line can meet the demand.

This utility model belongs to the field of soil drilling equipment and provides a drilling device for soil resistivity detection. It includes a base, a through groove at one end of the base, and a mounting frame fixedly connected to the upper surface of the base. The mounting frame has a U-shaped structure and contains a mounting column. This utility model mounts a screw rod to a drive motor. Starting the drive motor rotates the screw rod, and starting a first servo motor drives the screw rod to rotate via its output end. The rotation of the screw rod moves a slider within a groove, thus adjusting the height of the mounting column and the screw rod on it. This facilitates soil sampling. Furthermore, the tilt angle of the mounting column can be adjusted via an adjustment component, facilitating sampling of surrounding soil. Compared to existing soil sampling tubes, this device effectively improves the diversity of soil sampling results.

The invention discloses a method for determining cathode protection current demand quantity of a tank bottom plate of a built storage tank, and belongs to the technical field of corrosion protection of storage tanks. According to the technical scheme, the on-off potential of the peripheral area of the storage tank is determined, a geometric model of a storage tank bottom plate is established, and the polarization curve of the storage tank and the soil resistivity around the storage tank are tested; calculating the polarization potential of each storage tank peripheral recording point; then the calculated potential of each recording point is compared with the actually measured power-off potential in sequence, and the final cathode boundary corresponding to the storage tank is obtained by adjusting the coating surface; and calculating the whole potential distribution condition of the tank bottom plate of the storage tank, and determining the cathode protection current demand quantity of the tank bottom plate of the storage tank in combination with the condition of a field feed experiment. The method has the beneficial effects that the cathode protection current demand quantity of the bottom plate of the built storage tank can be accurately determined, the effectiveness of cathode protection design is ensured, the corrosion risk of the outer side of the bottom plate of the storage tank is effectively controlled, and the treatment cost, the environment and other adverse effects caused by corrosion leakage of the storage tank are reduced.

The invention relates to an impact grounding resistance calculation method based on a three-dimensional transmission tower simulation model, and the method comprises the steps: building a three-dimensional transmission line tower model comprising a tower body, a grounding lead and a grounding grid according to the actual structure size, material attribute and burying condition of a 220kV transmission line tower by using CDEGS software; a lightning current excitation source is arranged at the top of the tower, and lightning impulses with different amplitudes, waveforms and action time are simulated; carrying out electromagnetic field simulation calculation by utilizing CDEGS software, drawing a change curve of the impulse grounding resistance along with lightning current amplitude, time and soil resistivity parameters so as to judge a change rule of the impulse grounding resistance, carrying out simulation verification on the optimized three-dimensional transmission line tower model by utilizing the CDEGS software, and if the grounding resistance does not meet a standard value, carrying out electromagnetic field simulation calculation. And if not, continuing to adjust and optimize and repeating the simulation verification process until the grounding resistance meets the standard requirement.

The invention discloses a green grounding method and system for a new energy station. The method comprises the steps of obtaining multi-source grounding parameters such as soil resistivity, station topology, meteorological data and a fault current predicted value; a grounding grid optimization configuration parameter is generated through a dynamic weighted fusion algorithm; constructing a self-adaptive grounding grid structure comprising an adjustable grounding electrode depth module and a variable topology connection module; monitoring the state of the grounding grid in real time and dynamically adjusting; when a ground fault is detected, a green arc extinguishing strategy is started, and the pre-embedded energy storage element and the power electronic device are utilized to actively guide and extinguish the arc. According to the invention, the problems of poor environmental adaptability and poor fault arc extinction effect of the grounding system of the new energy station are solved, and the reliability, safety and intelligent level of the grounding system are significantly improved through dynamic adaptive adjustment and an active arc extinction strategy.

The invention belongs to the technical field of soil sampling, and particularly relates to a soil sampling device for soil resistivity measurement, which comprises an operation platform, a rotating seat and a sampling barrel, a cutting part is arranged at the bottom of the sampling barrel; a cooling cavity is formed in the side wall of the cutting part; a heat exchange cavity is formed in the side wall of the sampling barrel; a group of drainage holes and diversion holes are uniformly distributed between the cooling cavity and the heat exchange cavity; the cooling cavity, the heat exchange cavity, the drainage holes and the flow guide holes are all filled with cooling liquid. A drainage assembly is arranged in the drainage hole; cooling liquid between the cooling cavity and the heat exchange cavity is promoted to be continuously exchanged through the drainage assembly, heat absorbed by the cooling liquid is diluted, and due to the fact that the outer wall of the sampling barrel is in direct contact with an external low-temperature frozen soil layer, high-temperature cooling liquid entering the heat exchange cavity can be cooled through low-temperature soil; and when the formed low-temperature cooling liquid returns to the cooling cavity again, the heat of the cutting part is continuously absorbed, so that the cooling efficiency of the cutting part is improved.

The invention discloses a lightning resistance level calculation method and system based on multi-factor coupling three-dimensional tower simulation, a medium and equipment. In the method, according to the actual size, the structural form, the material attribute and the grounding body connection mode of a power transmission line tower, soil resistivity data obtained through field geological survey are combined; constructing a three-dimensional tower-soil coupling model comprising a tower structure and a multi-layer soil structure; inputting impact grounding resistance data actually measured on site into the three-dimensional tower-soil coupling model; setting a lightning current source with adjustable amplitudes and waveforms in the three-dimensional tower-soil coupling model, simulating lightning current impacts with different amplitudes and waveforms to act on the transmission line tower, and performing electromagnetic field simulation calculation by using CDEGS simulation software to obtain a tower voltage peak value and a grounding current peak value under the action of the lightning current; and calculating the lightning-resistant level of the power transmission line tower according to a lightning-resistant level formula, and adjusting the size, the material or the burial depth of the grounding body.

The application discloses a kind of ground electrode in time domain finite difference simulation soil ionization effect characterization method, including obtaining the geometry of the ground electrode to be characterized, soil characteristics, environment and excitation source parameters, construct electrode in FTDT simulation model;The model is meshed, the absorption boundary condition and simulation total length are determined and initialized;Current density and electric field intensity around electrode are calculated, and soil resistivity is updated;The total resistance of electrode under the distribution of current soil resistivity is calculated, and the equivalent radius of electrode is calculated correspondingly;The correction factor of time domain finite difference is calculated using the equivalent radius of electrode, and then the vertical electric field component parameter of electrode is corrected;When the current simulation length reaches the simulation total length, the ground electrode top voltage, resistance, equivalent radius characterizing soil ionization effect are output;Method can accurately characterize soil ionization effect under coarse grid, greatly improve the calculation efficiency.

The invention relates to the technical field of grounding grid fault monitoring, and discloses a method and a system for online real-time data acquisition and grounding grid fault monitoring. The method comprises the following steps: collecting real-time multi-source monitoring data streams of a grounding grid through a distributed sensor network, wherein the data streams comprise a current value, a voltage value and soil resistivity data; constructing the data into a dynamic grounding grid topological graph which comprises monitoring point nodes, electrical connection edges and a dynamic attribute set; performing fault feature extraction on the topological graph, and identifying abnormal nodes and high-risk connection paths; generating a basic fault monitoring strategy group by using a strategy optimizer; a user configuration signal is received through the man-machine interaction interface, and the strategy group is adjusted in real time; and executing the adjusted strategy group, and collecting performance index data to iteratively update the topological graph. According to the method, real-time monitoring of the operation state of the grounding grid and strategy dynamic optimization are achieved, the accuracy of fault identification and the flexibility of processing are improved, and the method is suitable for grounding grid fault monitoring in the fields of electric power, electronic information and the like.

The invention discloses a soil resistivity measurement method and a detection device, and relates to the technical field of soil resistivity measurement, the soil resistivity detection device comprises a voltage detection unit and a constant current source unit capable of adjusting frequency, one end of the constant current source unit is connected with a tower through a metal clamp, and the other end of the constant current source unit is connected with an auxiliary ground pole; the voltage detection unit is used for measuring the voltage of the constant current source; according to the invention, the soil resistivity detection device, the auxiliary earth pole and the grounding body are adopted to measure the soil resistivity, the grounding pole of the power transmission line tower is fully utilized, and high-precision measurement of the soil resistivity is realized at the power transmission line tower; according to the invention, the soil resistivity of the power transmission line tower can be accurately measured, on one hand, on-site measurement can be facilitated without being influenced by a measurement environment, and on the other hand, the influence of contact resistance can be well eliminated.

The invention discloses a method and a device for determining the minimum well depth of a deep well grounding electrode, which are used for solving the technical problems that the method for determining the minimum well depth of the deep well grounding electrode does not exist at present and an optimal well depth design scheme cannot be given. The method comprises the following steps: acquiring the electrode site soil resistivity of a deep well grounding electrode and the corrosion amount of a feed element used by the deep well grounding electrode; calculating the minimum effective length of the feed element according to the corrosion amount; according to the pole site soil resistivity, the pole site average line overflow density is calculated, and a deviation coefficient fitting formula of the pole site line overflow density is constructed based on the pole site average line overflow density; according to the minimum effective length and a deviation coefficient fitting formula, considering a coke settlement correction coefficient and an insulation connection influence correction coefficient, and calculating the minimum well depth of the single deep well with different deep well numbers.

The invention belongs to the technical field of disaster prevention and reduction of a power distribution network, and particularly discloses an induction lightning tripping early warning method and system for a 10 kV overhead line in a plain town area. In order to solve the problems that an existing method depends on full-wave electromagnetic simulation and is complex in calculation and low in efficiency, the invention provides a simplified model based on parameter dimension reduction. The method comprises the following steps: firstly, determining key parameters such as lightning ground lightning density, soil resistivity, insulator dry arcing distance and wire average height; a trip-out rate conversion model is constructed by establishing a nonlinear mapping relation between an inductive thunder trip-out rate and parameters, and the model is combined with the characteristics of terrain flatness and soil homogenization in a plain town area, and traditional three-dimensional electromagnetic field simulation is avoided through function coupling line parameters and thunder and lightning electromagnetic effects. During calculation, the trip-out rate is quickly output according to the parameter range, and the early warning level is matched to realize risk dynamic assessment. The problems of high computing power dependence and complex modeling are solved, and an efficient tool is provided for power grid lightning protection transformation and digital management.

This invention discloses a grounding device and arrangement method for transmission line towers to reduce step voltage, aiming to solve the technical problems of excessive step voltage, cumbersome construction, and inability to adapt to the safety requirements of different personnel activity areas in existing tower grounding devices. The device includes a horizontal grounding grid, grounding electrodes, grounding down conductors, and prefabricated mechanical connection components. The horizontal grounding grid consists of concentric square closed loops centered on the tower center and radial rays. Vertical grounding wires are welded to the apexes of the square closed loops. The tower feet are connected to the grounding electrodes via grounding down conductors and are connected to the horizontal grounding grid through prefabricated mechanical connection components. This invention, by adjusting the number and spacing of the square closed loops, can limit the step voltage to a safe threshold without laying a high-resistivity ground layer. Using prefabricated connectors instead of welding facilitates construction, adapts to different soil resistivities and personnel activity areas, provides reliable grounding, and is suitable for high-voltage transmission line towers, ensuring personal and equipment safety.

A magnetic suction wiring device for a soil resistivity tester comprises a male connector and a female connector, the female connector comprises a first insulating shell, a magnetic conductive metal ring, a second insulating rubber mat, a magnetic suction ring, a first insulating rubber mat and a nut, and the nut is connected with an electrode of the resistivity tester. The magnetic conductive metal ring, the second insulating rubber pad, the magnetic attraction ring, the first insulating rubber pad and the nut are sequentially arranged in the first insulating shell in a sleeving mode from top to bottom. The male joint comprises a silica gel sealing ring, a second insulating shell, a fourth insulating rubber mat, a permanent magnet, a third insulating rubber mat and a spring ejector pin, the silica gel sealing ring, the second insulating shell, the fourth insulating rubber mat, the permanent magnet and the third insulating rubber mat are hollow at the axis, and the spring ejector pin penetrates through the hollow part; the top of the spring ejector pin is hemispherical, the middle part of the magnetic attraction ring is provided with a hemispherical recess, the outer circumferential surface of the first insulating shell is provided with an L-shaped guide groove, and the inner circumferential surface of the second insulating shell is provided with a raised buckle. According to the utility model, through double insurance of magnetic attraction and mechanical locking, butt joint is completed within one second, and the operation intensity is reduced.

The invention discloses a system and a method for monitoring oil spill pollution of soil. The system mainly comprises a signal transmitter, a point source electrode, a measuring electrode array, a high-density electrical method host and a data acquisition system. The positive electrode of the signal transmitter is connected with the point source electrode inserted into soil, and the measuring electrode array is arranged in a detection area in a latticed mode and connected with the high-density electrical method host through a multi-core cable. A direct-current voltage gradient method is adopted to measure surface potential distribution, a high-density resistivity method is combined to obtain soil resistivity data, space coordinates, potential values and resistivity serve as input of a physical neural network, and pollutant concentration three-dimensional distribution is predicted through the trained network. Compared with the prior art, the device has the characteristics of high detection efficiency, good positioning precision and wide application range.

The invention belongs to the technical field of disaster prevention and reduction of a power distribution network, and particularly relates to a method and a system for evaluating a lightning trip-out rate of a 10kV overhead line in a plain area, which are used for solving the problems of high calculation complexity and long consumed time in the prior art. The method comprises the following steps: obtaining the lightning ground lightning density and the soil resistivity of an area where the overhead line is located, the insulator dry arc distance of the line and the average height of a wire, and rapidly calculating the lightning trip-out rate. Geographic parameters and empirical formulas are fused, traditional multi-physical field simulation is replaced, the calculation time is shortened to the second level from several hours, efficient evaluation can be achieved without professional lightning simulation knowledge, the method is suitable for basic power operation and maintenance units to quickly make lightning protection strategies, and the method is suitable for popularization and application. The method is especially suitable for a plain area with the altitude less than or equal to 1000 m, the soil resistivity of 50-1000 omega.m and the average height of the wire of 10-22 m.

The invention discloses a step voltage electric shock early warning system and method based on photovoltaic power generation. The system comprises a photovoltaic power generation power supply module, a step voltage detection and multi-sensor fusion module, a signal filtering and noise reduction module, an early warning and communication control module, a hardware integration and EMC optimization module and a state monitoring and self-diagnosis module. Through efficient photovoltaic module type selection and intelligent MPPT control, stable power supply in weak light and extreme temperature environments is achieved, and the problem that a traditional device is prone to failure in remote areas is solved; a multi-sensor fusion and two-stage filtering noise reduction technology is adopted, auxiliary parameters such as soil resistivity and environment temperature and humidity are combined, step voltage measurement errors are reduced, power frequency, high frequency and ground potential interference is restrained, and misjudgment is reduced.

The application discloses a kind of based on multi-layer soil structure's coastal grounding electrode arrangement optimization method, device, terminal equipment and storage medium, method includes: obtaining different horizontal layered coastal soil resistivity, seawater resistivity, coastline slope and initial each coastal grounding electrode arrangement scheme;Through grounding electrode soil simulation model simulation, the maximum step voltage on the ground of each coastal grounding electrode arrangement scheme under the coastal grounding electrode is calculated and the current density of each grounding electrode feeder rod;The correlation coefficient of both is calculated, and the weight coefficient of the current density of each grounding electrode feeder rod is calculated based on correlation coefficient;Select a coastal grounding electrode arrangement scheme to calculate adjustment coefficient;Based on adjustment coefficient adjustment optimization scheme, obtain the coastal grounding electrode arrangement scheme that meets the requirements. By implementing the application, the coastal grounding electrode arrangement scheme can be adjusted and optimized to obtain the coastal grounding electrode arrangement scheme that meets the requirements.