301 results about "Grounding resistance" patented technology

The invention discloses a ground resistance remote online monitoring method and system based on a mobile terminal, and relates to the technical field of ground resistance monitoring, and the method comprises the steps: obtaining a natural electromagnetic noise signal collected by the mobile terminal through a built-in sensor, and calculating a preliminary estimation value of ground resistance according to a preset model; according to the preliminary estimation value and the environmental parameters, using a machine learning algorithm to predict the optimal sampling frequency and time window under the current monitoring condition, and forming a dynamic adjustment mechanism; based on a dynamic adjustment mechanism, multiple mobile terminals are used for cooperative measurement, position information is synchronized and shared through a wireless network, and a virtual quadrupole measurement topological structure is constructed; based on the virtual quadrupole measurement topological structure, one part of the mobile terminals transmit test signals, the other part of the mobile terminals receive response signals, and the optimal sampling frequency and time window are combined to invert and generate a space resistance distribution diagram of the grounding grid; historical monitoring data, a space resistance distribution diagram and real-time environment parameters are combined.

The invention discloses a power transmission line tower grounding resistance measuring method and system, and relates to the technical field of high-voltage power transmission, and the measuring method comprises the following steps: transmitting a first electric signal to a coupling injection module, and enabling the coupling injection module to synchronously inject a same second electric signal to two lightning conductors of a power transmission line tower; acquiring voltage signals and current signals at the second electric signal injection positions of the two lightning conductors; and calculating the grounding resistance of the power transmission line tower according to the collected voltage signal and current signal. The same second electric signal is synchronously injected to the two lightning conductors through the coupling injection module, and the ring current between the two lightning conductors is greatly weakened, so that the ground current component can be better extracted, the ground resistance value can be quickly and accurately obtained, the measurement efficiency is improved, errors caused by manual operation are reduced, and the measurement accuracy is improved. The measurement mode does not need to insert an auxiliary grounding electrode and lay a long-distance lead, and is convenient to operate and wide in application range.

The invention relates to the technical field of power distribution network fault detection, and discloses a power distribution network high-resistance grounding fault intelligent detection method, system and device and a medium, and the method comprises the steps: collecting a power distribution network line transient signal which comprises a transient zero-sequence voltage signal and a transient zero-sequence current signal; preprocessing the transient signal and extracting a multi-dimensional feature set for representing high-resistance grounding fault characteristics, wherein the multi-dimensional feature set comprises a transient energy feature, a wavelet entropy feature and a harmonic component feature; and inputting the extracted multi-dimensional feature set into a pre-trained machine learning model, and simultaneously outputting a judgment result of the high-resistance grounding fault and an estimated value of the grounding resistance through the machine learning model. According to the method, the transient energy, the multi-scale wavelet entropy, the odd harmonic amplitude and the phase, which are derived from different analysis domains and have complementary physical meanings, are deeply fused, so that the problem that a single feature is weak in characterization capability and easy to fail under the conditions of high noise and high resistance is effectively solved.

The invention relates to the technical field of power distribution network fault monitoring and forest fire early warning, and discloses a high-voltage line tree line fault ignition time early warning method and device and a medium, and the method comprises the steps: collecting electrical characteristic data and non-electrical characteristic data in a single-phase tree contact grounding fault process in real time; performing preprocessing and sliding window processing on the electrical characteristic data to screen out a key characteristic set; establishing a thermal-electric coupling model representing the exponential decay relation of the equivalent grounding resistance along with the rise of the tree body temperature; training a plurality of different types of data-driven models based on the key feature set to regressively predict the ignition time countdown; taking prediction results of the plurality of data driving models on the training set as input, and taking real ignition time as a target to train a linear regression model as a fusion device so as to obtain an ignition time countdown early warning model; and according to a final predicted value output by the ignition time countdown early-warning model, determining and outputting an early-warning level and a confidence coefficient. According to the invention, early warning can be realized hundreds of seconds before open fire appears.

A power transmission tower grounding resistance intelligent measurement method based on ground potential field distributed sensing comprises the steps that a ground potential sensing network is arranged around a power transmission tower grounding device, and a ground potential field distributed measurement system with an iron tower as the center is established; a broadband characteristic coding current signal is injected into the grounding system through a weak current injection module; acquiring potential response data of each node of the ground potential sensing network excited by the feature coding current signal by adopting a distributed synchronous acquisition technology, and reconstructing complete ground potential field spatial distribution from sparse node observation data based on a compressed sensing theory through a signal reconstruction algorithm; and inputting the reconstructed complete ground potential field spatial distribution map into a pre-trained map neural network model, and outputting an intelligent identification result and an anomaly diagnosis conclusion of the ground resistance. According to the invention, non-contact, distributed and high-precision grounding resistance measurement under the condition that a grounding lead does not need to be disconnected is realized, and the measurement precision and reliability under a complex working condition are remarkably improved.

The invention discloses an interference suppression measurement method for a grounding resistor, and relates to the technical field of interference resistance, and the method comprises the steps: injecting a detection current into a grounding electrode, and synchronously collecting an original voltage signal at two ends of the grounding electrode and a time domain waveform of the detection current; performing time domain segmentation on the original voltage signal, performing linear frequency modulation wavelet transform on the signal in each time period, generating an initial time-frequency matrix, extracting a time-frequency ridge line from the initial time-frequency matrix, identifying interference information, obtaining an interference-removed time-frequency matrix, optimizing the interference-removed time-frequency matrix through robust kernel principal component analysis, and obtaining an interference-removed time-frequency matrix; a synchronous redistribution operator is used for carrying out signal purification, a pure time-frequency matrix is obtained, linear frequency modulation Z transformation is carried out on the pure time-frequency matrix, voltage amplitude and frequency are extracted, an energy centroid method is used for correcting the voltage amplitude and frequency, interference can be effectively restrained, and the grounding resistance measurement precision is remarkably improved.

The invention relates to an unbalanced data-oriented electric power system lightning disaster risk detection method, which comprises the following steps of: S1, gridding a target detection land parcel to obtain a plurality of grid units; S2, based on latitude and longitude coordinates of each grid unit, obtaining line parameters and environment characteristics of each grid unit in combination with a line database and a geographic information base, wherein the line parameters comprise tower height, span, grounding resistance, loop number, lightning arrester number and transformer capacity, and the environment characteristics comprise soil conductivity, building height and land utilization type; and S3, inputting the line parameters and the environment characteristics of each grid unit into a trained first detection model to obtain the thunder and lightning probability and the maximum peak current of each grid unit. Compared with the prior art, the multi-source data such as the tower height, the span, the grounding resistance and the soil conductivity are comprehensively considered, and the risk assessment result has higher regional adaptability and accuracy.

A power transmission tower grounding resistance non-contact measurement method based on the electromagnetic coupling principle comprises the following steps that transmitting and receiving electromagnetic coupling coils are arranged around an iron tower grounding body, and geometric calibration and spatial positioning of a measurement area are completed by combining grounding grid structure parameters and soil conduction characteristics; injecting a high-frequency alternating-current excitation signal into the transmitting coil, and synchronously acquiring the amplitude and phase response of the induced voltage at a receiving coil end; carrying out filtering processing on the induction signal by adopting a time-frequency analysis and phase decoupling algorithm, and solving a function relationship between electromagnetic response and grounding impedance by combining a coupling equivalent model; based on experimental calibration data and scene parameters, a nonlinear mapping model of induction response and grounding resistance is constructed, and real-time inversion calculation is carried out by combining a solving result obtained in the third step. According to the invention, the real-time accurate measurement of the grounding resistance under the conditions of no power failure and no wire breakage is realized, and the safety, the operation convenience and the anti-interference capability in a complex environment in the measurement process are obviously improved.

The invention relates to the field of electrical safety monitoring, in particular to an explosion-proof grounding resistance online monitoring system. The device comprises an explosion-proof housing, a pulse generator, a sensor, a microprocessor and a communication module. The explosion-proof housing is provided with a closed ground wire through hole. The pulse generator, the sensor and the microprocessor are all arranged in the explosion-proof shell, and the microprocessor is in communication connection with the pulse generator and the sensor; the communication module is in communication connection with the microprocessor; the microprocessor circularly monitors and calculates a grounding resistance value and a metal connection resistance value according to time set by a user, and actively uploads the values to a background monitoring center through the communication module. According to the invention, automatic and real-time resistance on-line measurement can be realized in an explosion-proof environment, an alarm can be given when a resistance value exceeds a threshold value, and a fault can be effectively identified.

The invention discloses a grounding resistance thermal-electric coupling prediction method and system suitable for various soil scenes. The method comprises the following steps: acquiring an electrode parameter, a soil parameter, a grounding fault parameter and initial temperatures of an electrode and soil; calculating an electrode current and a soil leakage current of the time step based on the electrode and soil resistivity of the time step; based on the electrode current and the soil leakage current of the time step, calculating the electrode temperature, the soil radial temperature distribution and the grounding potential rise of the time step by adopting a finite difference method; based on the electrode temperature and soil radial temperature distribution of the time step, updating the electrode resistivity and the soil resistivity of the time step + 1; if the end of the fault time is not reached, returning to continuously calculate the temperature of the electrode and the soil at the time step + 1; otherwise, outputting the electrode temperature and soil radial temperature distribution of each time step. According to the invention, thermal-electric dynamic coupling is considered, and accurate evaluation of the performance of the grounding system is realized.

The invention relates to a development type single-phase earth fault real-model test device and a control method, the development type single-phase earth fault real-model test device is connected in a whole power grid and comprises a fault intelligent generation module, and the fault intelligent generation module comprises a dynamic resistance simulation unit and an intelligent switching control system. And the intelligent switching control system is used for controlling the access resistance value and the access time of the resistor in the dynamic resistance simulation unit. The dynamic resistance simulation unit structure is of a three-level resistance topology and is combined with a mixed switching matrix of a vacuum relay and a solid-state relay. The intelligent switching control system is used for realizing the switching of the resistor at a current zero crossing point, the intelligent switching control system comprises a low-power-consumption control circuit and a signal acquisition circuit, the structure is matched with the control method, the continuous or step dynamic change of the grounding resistor can be accurately simulated, the problem of transient impact in the resistor switching process is solved, and the stability of the grounding resistor is improved. And a standardized and quantifiable test platform is provided for performance assessment of power distribution network fault handling equipment.

The invention discloses a grounding resistance monitoring and early warning system, which belongs to the field of grounding resistance monitoring, and comprises an excitation measurement module which is deployed and installed on each grounding loop of a grounding grid to send a plurality of excitation measurement signals with different frequencies, generates induction current on the grounding loop and a grounding electrode, and sends the induction current to the grounding loop; the monitoring and sensing module is deployed and buried in soil around the grounding electrode to form a monitoring network matched with the grounding network, receives the induction current and collects the environment temperature and humidity of the surrounding soil, and the early warning management module is used for obtaining the induction current, the environment temperature and humidity received or collected by the monitoring and sensing module and sending early warning information to the monitoring and sensing module. According to the method, the grounding resistance value of the grounding loop is calculated, health judgment of the grounding resistance is performed according to the calculation result, corresponding early warning measures are taken according to the health judgment, the grounding resistance in the grounding grid is managed, predictive maintenance can be realized, potential risks can be recognized in advance, and sufficient response time is reserved for replacement or maintenance of the grounding grid.

The invention relates to the technical field of power equipment, and discloses a grounding resistance testing device for power distribution installation, which comprises a main shell, a winding mechanism is arranged in the main shell, a pulling groove is fixedly connected in the main shell, and two sliding grooves are symmetrically formed in the upper and lower outer walls of the pulling groove. Sliding blocks II are slidably connected to the inner walls of the sliding grooves, clamping columns are slidably connected to the middles of the sliding blocks II, cavities are formed in the clamping columns, telescopic clamping mechanisms are arranged at the ends, facing the cable, of the cavities, and guide plates are mounted on one sides of the sliding grooves. The intermittent longitudinal tension control structure simulating manual pulling and the transverse wire arranging mechanism of the limiting ring cooperate with each other, so that the cables can be uniformly and neatly arranged between layers in the winding process and can be temporarily loosened after each pulling period, and abrasion, fatigue or cracking of an outer sheath caused by long-term tensioning are effectively avoided.

The invention provides a high-resistance grounding fault detection method, device and equipment and a storage medium, and the method comprises the steps: collecting a three-phase current and voltage signal of a small-resistance grounding system, and carrying out the processing of the three-phase current and voltage signal to obtain a zero-sequence current and a zero-sequence voltage; when the zero-sequence voltage energy characteristic meets a preset condition, calculating fault grounding resistance according to the zero-sequence current, the zero-sequence voltage and system electrical parameters; calculating a transient zero-sequence current characteristic value and a steady-state zero-sequence voltage characteristic value according to the fault grounding resistance, and comparing the characteristic values with a threshold value; and when the two characteristic values are both smaller than the corresponding threshold values, determining that the fault is a high-resistance grounding fault. According to the method, the fault grounding resistance is calculated, the transient state and steady state characteristic criteria are deduced based on the resistance, and the detection basis is converted from direct measurement of the fault current to analysis of the fault resistance characteristics, so that accurate identification of the low-current high-resistance grounding fault which is difficult to detect by a traditional method is realized.

The invention provides an anti-interference measurement method and system for grounding grid parameters in a strong interference environment, and belongs to the technical field of grounding device parameter measurement. The method comprises the following steps: constructing a multi-physics field coupling theoretical model, and integrating a high-precision clock synchronization and wireless communication high-fidelity sensor network; phase and amplitude errors in signal transmission are effectively eliminated through an anti-interference and fidelity processing mechanism, and finally the grounding resistance and related electrical characteristics are calculated by solving a parameter equation set derived from a theoretical model. According to the invention, by constructing a multi-physics field coupling theory model and designing a high-fidelity sensing network, and combining a distributed clock synchronization technology and an anti-interference signal processing mechanism, accurate, portable and safe measurement of the grounding resistance of the tower at a strong interference power transmission line site without power failure and disconnection of a down lead is realized. According to the invention, the risk of operating high-voltage equipment and the complexity of burying the auxiliary electrode in the traditional measurement are thoroughly avoided.

The utility model is suitable for the technical field of grounding resistance measuring instruments, and provides a grounding resistance measuring instrument with a sealing structure, which comprises a box body and a groove, a detector body is arranged in the groove; the mounting seat surrounds the outer side of the detector body; a sealing rubber ring is arranged in the mounting seat, and one side of the box body is hinged and matched with a box cover through a hinge; a sealing top plate is arranged on the closed contact side of the box cover and the box body; the mounting groove and the sealing rubber strip are arranged in the middle of the sealing top plate; according to the utility model, the sealing system ensures the stability and the slowness of operation, so that the measuring instrument is protected in all directions; the sealing system effectively prevents external factors such as dust and moisture from invading, and ensures the accuracy and reliability of the measuring instrument in a severe environment; meanwhile, due to the stable and slow operation design, the user experience is improved, damage possibly caused by quick or sudden action is avoided, and a powerful guarantee is provided for long-term stable operation of the measuring instrument.

The invention discloses a high-altitude operation robot for measuring the grounding resistance of a wind power blade lightning arrester, and belongs to the technical field of wind power equipment operation and maintenance and high-altitude operation robots. The robot comprises a track arranged along the wind power blade, a high-altitude mobile robot platform capable of moving along the track, a rotary holder mounted on the platform and a mechanical arm assembly mounted on the holder. The mechanical arm assembly comprises a probe moving mechanism and a grounding resistance measuring probe. The probe moving mechanism can drive the grounding resistance measuring probe to move linearly, and the grounding resistance measuring probe is provided with a rotatable contact head and a propulsion execution mechanism. During working, the direction of the mechanical arm is adjusted by rotating the holder, the contact head is driven to contact and grind the surface of the lightning arrester to form good electrical connection, and then grounding resistance measurement is completed by measuring the wire. According to the invention, the robot is used for replacing manual high-altitude operation, and safe, efficient and reliable measurement of the grounding resistance of the lightning arrester of the wind power blade is realized.

The invention discloses an ultrahigh-frequency RFID anti-serial-reading near-field antenna which is characterized in that the front surface of a PCB is a radiating surface, a microstrip line formed by copper foil is laid on the radiating surface, the back surface of the PCB is a shielding ground and is provided with a copper foil layer, and the PCB is provided with a via hole communicating the radiating surface with the shielding ground; the shielding ground is provided with a grounding resistor, the grounding resistor is electrically connected with the copper foil layer, the grounding resistor is electrically connected with the terminal of the microstrip line through the via hole, and the head end of the microstrip line is electrically connected with the pin of the radio frequency connector. According to the antenna structure, the application of a multi-density antenna deployment scene is met, short-distance, high-precision and controllable energy reading of the tag is realized, misreading or serial reading of adjacent tags is effectively prevented, and the application scene of fixed-point reading is met.

The application discloses a TN-C-S low-voltage power distribution system single-phase ground fault identification method, and belongs to the technical field of power system fault characteristics and relay protection. The single-phase ground fault identification method effectively solves the inadaptability problem of traditional single residual current protection by collecting residual current and zero sequence current and the fault current approximately separated by the algorithm of the application. The application collects residual current, zero sequence current data and three-phase power supply voltage data respectively, relies on the short-time invariability of the neutral point grounding resistance and the repeated grounding resistance, proposes to separate the fault current by using the residual current and the zero sequence current, then compares the fault current with the setting threshold to identify the single-phase high-resistance ground fault, and obtains the fault phase according to the matching of the phase of the separated fault current and the phase of the power supply voltage, so that the single-phase high-resistance fault identification and phase selection identification are realized.

This utility model discloses a grounding resistance meter calibration device, relating to the field of grounding resistance meter technology. It includes a chassis, with a calibration instrument body fixedly connected inside the chassis. A display screen is fixedly connected to one side of the calibration instrument body, and a test interface is provided on one side of the display screen. This utility model employs the above structure, using a transmission component installed inside the chassis to move an assembly plate. The assembly plate is tilted, and multiple cooling fans are fixed to the tilted assembly plate. The tilted cooling fans change the airflow direction, forming an angled airflow that better removes heat. The cooling fans move on both sides of the calibration instrument body inside the chassis, expanding the heat dissipation coverage, preventing localized heat accumulation inside the chassis, allowing heat to be dissipated more efficiently, effectively reducing the overall temperature inside the chassis, slowing down the aging of electronic components, and ensuring the long-term stable operation of the grounding resistance meter calibration instrument.

This invention discloses a method and system for assessing the grounding resistance status of transmission towers, relating to the field of grounding measurement technology for transmission towers. The method includes: acquiring a grounding impedance characteristic sequence and a three-dimensional environmental characteristic sequence; calculating the comprehensive environmental influence intensity index for each cycle; calculating the response lag coefficient for the current cycle; calculating the dominant weight index of environmental effects for the current cycle; constructing and training two types of hidden Markov models, independent and joint, to obtain the independent observation probability and joint observation probability of each hidden state in the current cycle; based on the independent and joint observation probabilities, obtaining the corrected observation probability of each hidden state in the current cycle; based on the corrected observation probabilities, calculating the confidence level of each hidden state in the current cycle, and determining the grounding resistance status for the current cycle. This invention can dynamically distinguish between normal current dissipation capacity fluctuations caused by the environment and real anomalies caused by equipment degradation, improving the accuracy of grounding status assessment.

The present application relates to the technical field of grounding resistance monitoring, in particular to a lightning protection grounding resistance real-time monitoring system based on the Internet of Things, which comprises a variable-frequency excitation collection module for generating a variable-frequency excitation signal superimposed with a low-frequency sinusoidal disturbance component according to a signal generator, loading the variable-frequency excitation signal to a lightning protection downlead input end, and generating a discrete voltage and current sequence. In the present application, the collected current response sequence is decomposed into multiple independent frequency band subspaces and the high-frequency node energy entropy is calculated, the information entropy theory is used to quantify the confusion degree of signal frequency energy distribution, the micro-arc discharge and high-frequency singular signals caused by mechanical connection loosening or contact surface oxidation can be captured, the static resonance resistance characteristics and dynamic contact entropy characteristics are combined, the health state discrimination of the grounding net from physical corrosion to contact stability is realized, and the situation that the lightning fire hazard caused by poor contact is covered due to the false qualified resistance value is avoided.

The invention discloses a high-voltage iron tower comprehensive performance on-line monitoring device and a monitoring method thereof, and the device comprises a comprehensive monitoring unit which is configured to obtain a monitoring instruction sent by a microprocessor unit to monitor a high-voltage iron tower. The microprocessor unit processes various data of the detected iron tower monitored by the comprehensive monitoring unit and then sends the data to the display unit; the comprehensive monitoring unit comprises a grounding resistance measuring module; an iron tower attitude measurement module; an iron tower screw loosening measurement module and an iron tower temperature measurement module; according to the high-voltage iron tower comprehensive performance on-line monitoring device and the monitoring method thereof, based on a multi-sensing technology, by arranging a plurality of measuring modules electrically connected with the microprocessor unit, the grounding resistance, the space attitude, the screw loosening condition and the iron tower temperature of the high-voltage iron tower can be monitored on line at the same time, manpower and material resources are saved, and meanwhile potential safety hazards are reduced.

The application provides an engineering quantity measurement method based on power construction supervision engineering, comprising: acquiring geographic coordinate data of an extra-high voltage tower base position, extracting terrain and landform diversity features and soil type difference information from the geographic coordinate data through satellite remote sensing image processing, and obtaining an extra-high voltage tower base resistance geographic regularity distribution map through geographic information system superposition analysis; collecting high-voltage electric field interference intensity data generated by an extra-high voltage transmission line around the tower base, combining the extra-high voltage tower base resistance geographic regularity distribution map, analyzing the influence degree of high-voltage electric field interference on tower base grounding resistance fluctuation, and obtaining an adjusted tower base resistance change rate and fluctuation frequency; obtaining tower base position analysis results from a differentiated steel reinforcement cage binding quantity measurement strategy, combining a resistance geographic regularity subset to optimize the distribution proportion of the steel reinforcement cage binding quantity, and obtaining a resource configuration optimized binding quantity measurement table.

The present application relates to the technical field of resistance measurement, in particular to an intelligent lightning interceptor for a petrochemical plant area and an online grounding resistance measurement method. Based on the environmental complexity in the lightning process and the drainage capacity value of the intelligent lightning interceptor, the injection frequency is corrected to obtain the effective injection frequency value of the number of days with lightning; the current fluctuation in the number of days without lightning is analyzed to correct the injection frequency to obtain the effective injection frequency value of the number of days without lightning; the effective injection frequency values corresponding to the number of days with lightning and the number of days without lightning are combined to obtain the corrected injection frequency; and the online grounding resistance is measured according to the corrected injection frequency. The present application realizes adaptive adjustment of the injection frequency through historical monitoring data, avoids the problem of errors in the measurement of the online grounding resistance using a fixed low-frequency signal, and improves the ability to effectively discharge lightning in the lightning impact moment.

This invention discloses a clamping method for lightning overvoltage on overhead lines and a combined lightning protection and vibration prevention device. The method includes the following steps: based on the propagation characteristics of lightning waves in a medium, a local impedance abrupt change point is set on the overhead line to alter the propagation process of the lightning wave; wherein, the local lightning wave impedance at the local impedance abrupt change point is less than the overhead line impedance; when the lightning wave reaches the impedance abrupt change point, the voltage wave undergoes negative reflection while the current wave undergoes positive reflection, and the electric field energy of the lightning wave is converted into magnetic field energy, thereby achieving the clamping of the lightning overvoltage. This invention actively clamps lightning overvoltage through impedance transformation and achieves integrated lightning protection and vibration prevention, completely eliminating the dependence of traditional protection on low grounding resistance, effectively reducing the lightning tripping rate while eliminating spatial conflicts and mutual interference between devices.

The utility model provides a PTC (Positive Temperature Coefficient) heater with a grounding device on a tube body, which comprises a tube body, one or more sheet-shaped PTC heating elements are arranged in the tube body, an upper electrode plate and a lower electrode plate are arranged on the upper plane and the lower plane of each PTC heating element, the outer sides of the upper electrode plate and the lower electrode plate are wrapped by an insulating layer to form a PTC heating core, and the grounding device is arranged on the tube body. And a grounding device is arranged on the outer side surface of the pipe body. Compared with the prior art, the grounding device has the beneficial effects that the grounding screw is directly fixed on the pipe body, the grounding resistance is small, the grounding screw and the sawtooth annular terminal are used for grounding, the loosening problem of the grounding device is prevented, and the grounding reliability of the product is effectively ensured.

The invention provides a floating photovoltaic power station grounding resistor fault positioning method and device, the method is applied to a controller in a fault positioning system, and the fault positioning system further comprises a grounding grid of a floating photovoltaic power station, a sensing network formed by deploying sensors at key nodes of the grounding grid, and a signal generator. The method comprises the following steps: in response to a received fault positioning instruction, triggering a signal generator to inject a high-frequency test current signal into a grounding grid; acquiring a current-voltage data set through a voltage response signal of each key node acquired by a sensing network; based on the current-voltage data set, resistivity distribution reconstruction is carried out by adopting an impedance imaging algorithm, and a three-dimensional resistivity distribution diagram of the grounding grid is generated; and according to the three-dimensional resistivity distribution diagram, positioning an abnormal region with a resistance value exceeding a preset threshold value in the grounding grid. According to the method, three-dimensional visual imaging of resistivity distribution in the grounding grid and accurate positioning of an abnormal area are realized.

The application discloses a carbon fiber composite grounding body grounding resistance measurement method and system, and relates to the technical field of grounding resistance measurement, wherein the method comprises the following steps: acquiring electrical signal data of each test point prearranged on a carbon fiber composite grounding body, pre-processing the electrical signal data to generate an initial resistance measurement data set; performing multi-dimensional decoupling processing on the initial resistance measurement data set to generate an electrode core body resistance component, a conductive solidification layer body resistance component and a grounding body-soil contact resistance component; constructing a carbon fiber composite grounding body grounding resistance correlation model according to the electrode core body resistance component, the conductive solidification layer body resistance component and the grounding body-soil contact resistance component; and performing checking processing on the design parameters of the carbon fiber composite grounding body based on the carbon fiber composite grounding body grounding resistance correlation model to obtain grounding resistance checking data. The application can overcome the defects that the prior art cannot measure resistance in layers and is difficult to judge the rationality of parameters.

The application discloses a kind of transmission line tower grounding resistance measurement method and system, it is related to high-voltage transmission technical field, the measurement method includes the following steps: first electric signal is sent to coupling injection module, makes coupling injection module to the two lightning arresters of transmission line tower Synchronous injection same second electric signal;Two lightning arresters are collected at the voltage signal and current signal of second electric signal injection place;According to the voltage signal and current signal of collection transmission line tower grounding resistance is calculated.The application is injected into the same second electric signal by coupling injection module to two lightning arresters Synchronous, greatly weaken the circulation between two lightning arresters, so that the ground current component can be better extracted, ground resistance value can be quickly and accurately obtained, improve measurement efficiency, and reduce the error caused by human operation, this kind of measurement mode does not need to insert auxiliary grounding electrode and lay long distance lead, it is convenient to operate, and the scope of application is wide.