31 results about "Soil resistivity" patented technology

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 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 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 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 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 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 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.

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 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.

One example includes a method for generating a grounding solution for lightning strikes. The method includes determining a geographic location of a lightning-sensitive electrical device and receiving soil resistivity data of soil at the geographic location and a surrounding geographic region. The method also includes implementing a grounding solution algorithm. The algorithm includes converting the soil resistivity data to resistance values, calculating a quantity of grounding rods for the grounding solution based on the resistance values relative to a predefined ideal resistance value, and calculating a safety distance of mounting the grounding rods with respect to the lightning-sensitive electrical device based on the resistance values. The method further includes generating installation instructions for implementing the grounding solution by mounting the grounding rods in the geographic region based on the calculated quantity of grounding rods and the calculated safety distance.

The application discloses a system and a method for in-situ determination of thermoelectric parameters of rock-soil bodies, which comprises an in-situ detection probe, a data acquisition instrument, a penetration assembly connecting the two, 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 electrode resistivity probe, a heating probe inserted into a hollow cylinder of the four-phase electrode resistivity probe, and an adapter connecting the CPTU static sounding probe and the four-phase electrode 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 at intervals in a cylinder outer ring. In the application, the soil resistivity is first tested, then the heating wire is powered and heated, the four-phase electrode resistivity probe is used as a temperature sensor of the heating probe, and the synchronous test of the rock-soil body soil layer classification and the thermoelectric parameters is realized. The application also proposes a column heat source-parameter estimation method for the test of the thermal parameters, which significantly improves the accuracy of the test.

The application discloses a lightning overvoltage peak value calculation method, system, device and medium, comprising: based on the finite difference time domain algorithm, the lightning electromagnetic coupling process under different ground resistivity and lightning distance is simulated, the magnetic field response quantity and the overvoltage peak value response quantity are extracted, and the correction coefficient function and the parameter function related to the ground resistivity are fitted respectively; the lightning current peak value at the time of lightning is obtained through a lightning current acquisition device; the equivalent complex depth under the non-ideal ground condition is calculated in combination with the above functions, and the equivalent complex depth, the lightning current peak value and the line electrical geometric parameters are substituted into the closed-form analytical model to quickly solve the lightning induction overvoltage peak value of the overhead line. The application effectively overcomes the problem of insufficient precision of the traditional model under the scene of high soil resistivity and long distance lightning, and takes into account the calculation efficiency and engineering practicability.

The application discloses a test method for a fixed test piece assembly of a navigation fuel oil pipeline cathodic protection, and relates to the field of testing electric variables of fixed test pieces, and comprises the following steps: S1, synchronously connecting a test piece and a pipeline loop through a current interrupter, and setting an on-off period; S2, synchronously collecting, by a high-speed data collector, a potential signal of the test piece relative to a long-acting copper sulfate reference electrode or a soil Ag / Cl reference electrode, a current signal measured by a precision sampling resistor, and an interrupter synchronous signal, and the synchronization error between channels is less than or equal to 0.5 mu s; S3, locking a stable value before interruption as E1 based on the synchronous signal, and extracting a stable platform value after interruption as E2; S4, calculating an IR drop value of the test piece; S5, calculating a loop grounding resistance, and measuring soil resistivity p to verify the loop grounding resistance. The synchronous interruption and multi-channel synchronous collection, combined with Fourier / wavelet transform filtering processing and accurate measurement of the IR drop, solve the measurement distortion problem caused by signal asynchronization and noise interference, and provide accurate data basis for cathodic protection state evaluation.

The utility model relates to the technical field of soil detection, and discloses a soil resistivity grounding detection device, which comprises a detector and a first lead arranged on the detector, and further comprises two storage boxes which are fixedly arranged on the surface of one side of the detector and are distributed in a bilateral symmetry manner; the rolling shafts are rotationally connected to the inner sides of the storage boxes, and two rolling shafts are arranged in each storage box; the second wires are arranged on the winding shaft, the number and the distribution position of the second wires are matched with those of the first wires and the winding shaft, one ends of the second wires are electrically connected with the first wires, the other ends of the second wires are provided with probes located on the outer side of the storage box, and the second wires can be wound and stored to the outer side of the winding shaft; and the rotation detection component is arranged on the surface of the storage box, is connected with the winding shaft and is used for detecting the rotation position of the winding shaft. The earth resistivity grounding detection device aims to improve the accuracy and portability of measurement.

The invention belongs to the technical field of power equipment, and relates to a conductive polyolefin coated metal grounding system and a construction method thereof. The conductive polyolefin coated metal grounding system comprises a grounding material and a conductive polyolefin layer, wherein the grounding material comprises a metal core material and a conductive polyolefin layer coated on the outer surface of the metal core material; the resistance reducing layer is coated on the outer part of the grounding material; and the ion slow release agent is arranged in the mounting base body around the grounding material. In the grounding material adopted by the conductive polyolefin coated metal grounding system, the conductive polyolefin layer forms a physical barrier for the metal core material, so that the corrosion rate of the grounding material can be reduced; the resistance reducing layer and the ion slow-release agent cooperate to maintain long-term stability of the grounding resistance and adapt to a high-soil resistivity environment. The conductive polyolefin coated metal grounding system is simple and convenient to construct, high in environmental adaptability, green and environment-friendly.

The invention relates to an electric power system power distribution network lightning protection and insulation cooperation technology, in particular to a high-altitude 10kV line structure type lightning protection and insulation cooperation compensation method and device, and the method comprises the steps: obtaining and inputting environment parameters, and forming a rigid entrance constraint of high-altitude insulation cooperation compensation; selecting a structure boundary and arrangement parameters; establishing a grounding parameter management and control mechanism based on the soil resistivity; the direct lightning, the inductive lightning and the power frequency follow current are jointly checked; if the joint check does not reach the standard, threshold check and parameter recheck are carried out; and if the joint check reaches the standard, performing parameter freezing and acceptance check implementation. According to the method, environment parameters, structure parameters and performance indexes form a computable, acceptance-acceptable and replicable mapping relation through multi-scene joint checking and rule-driven parameter reselection, so that the induction flashover rate and the follow current arcing risk are remarkably reduced, pole top / far-end potential rising is inhibited, and the lightning resistance level and the operation reliability of a high-altitude distribution line are improved.

The invention discloses a grounding device suitable for a multi-stone region, which comprises a grounding electrode, a vertical cylinder and a conical cylinder coaxially and slidably sleeved in the vertical cylinder, the lower port of the conical cylinder is larger than the upper port of the conical cylinder, and the grounding electrode comprises a vertical electrode column coaxially arranged in the conical cylinder. By arranging a coaxial separable structure of the vertical barrel and the upright conical barrel, a controllable resistance reducing agent forming space is formed in the multi-stone foundation. During construction, after a resistance reducing agent is poured into the conical barrel and solidified, low-resistance demolding is achieved through the structural characteristic that the resistance reducing agent is small in upper portion and large in lower portion and the gap which is gradually enlarged from bottom to top between the conical barrel and the vertical barrel. And then the vertical cylinder is smoothly pulled out, and the surrounding loess is backfilled from bottom to top and coated with the solidified resistance reducing agent to form the low-resistance grounding body in close contact with the soil. The structure effectively reduces the contact resistance and the soil resistivity, enlarges the equivalent diffusion area, and remarkably improves the grounding stability and the lightning protection performance.

The application 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 cylinder. A cutting part is arranged at the bottom of the sampling cylinder. A cooling cavity is arranged in the side wall of the cutting part. A heat exchange cavity is arranged in the side wall of the sampling cylinder. A group of drainage holes and flow guide holes are uniformly arranged 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 filled with cooling liquid. A drainage assembly is arranged in the drainage holes. The cooling liquid between the cooling cavity and the heat exchange cavity is continuously exchanged by the drainage assembly, and the heat absorbed by the cooling liquid is diluted. Since the outer wall of the sampling cylinder directly contacts with the low-temperature frozen soil layer, the low-temperature soil can be used to cool the high-temperature cooling liquid entering the heat exchange cavity, and the low-temperature cooling liquid returning to the cooling cavity can continuously absorb the heat of the cutting part, so that the cooling efficiency of the cutting part is improved.

The application discloses a substation grounding system design method, device, equipment, storage medium and computer program product, relates to the grounding technology field of the power system, and the method comprises the steps of: soil resistivity testing of a substation in a target test range, constructing a horizontal layered soil model according to test data; determining the initial resistance reduction measures corresponding to the grounding grid of the substation according to the layered type of the horizontal layered soil model, and determining the initial voltage distribution measures on the basis of the initial resistance reduction measures; outputting the initial grounding system of the substation based on the initial resistance reduction measures and the initial voltage distribution measures; dynamically checking the safety of the initial grounding system, and iteratively correcting the initial grounding system according to the checking result to determine the optimal grounding system of the substation. The above method of the application can make the finally determined optimal grounding system effectively adapt to the complex dynamic environment in actual operation, thereby guaranteeing the normal operation of equipment and the safety of operation and maintenance personnel.