223 results about "Ground current" patented technology

The invention relates to a power cable insulation state real-time monitoring and alarm device, and belongs to the technical field of power equipment state monitoring. Comprising a multi-source sensing unit which is installed at a cable body and a joint; the edge computing terminal is fixed in the cable well or the ring main unit; and the cloud early warning platform receives the processing data and outputs an alarm instruction. According to the invention, multi-parameter deep fusion is realized, four-dimensional monitoring of grounding current, temperature, partial discharge and humidity is initiated for the first time, and limitation of a single parameter is broken through; and an insulation health index IHI is proposed, and the insulation deterioration degree is quantitatively evaluated. According to the method, tan delta and IHI are calculated on site through an edge-cloud collaborative architecture edge terminal, so that the data transmission quantity is reduced; the cloud dynamic threshold value is adjusted, and the alarm accuracy is improved. According to the invention, intelligent early warning mechanism three-level alarm linkage protection equipment is arranged; and the self-calibration function ensures long-term reliability.

The invention discloses a power distribution network grounding fault research and judgment analysis method, relates to the technical field of power distribution network fault analysis, and solves the technical problem that fault analysis is not accurate and deep enough due to the fact that fault features in a neutral point grounding complex fault scene cannot be comprehensively considered. According to the method, single-phase grounding fault models of a neutral point ungrounded system, an arc suppression coil grounded system and a small resistor grounded system are respectively constructed, grounding current, phase voltage and neutral point voltage expressions under the models are detailedly deduced, and characteristics of voltage and current before and after a fault point in the steady-state and transient-state processes are deeply analyzed; the method comprehensively considers various complex fault scenes, can more accurately grasp essential characteristics of faults in different grounding modes, and provides a more comprehensive and accurate basis for fault diagnosis and processing.

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 discloses a high-voltage cable grounding current abnormity monitoring system, which belongs to the technical field of electric power facilities and comprises an inspection acquisition module, an association analysis module, a collaborative reasoning module and a self-optimization module. The inspection acquisition module is used for synchronously acquiring multi-source monitoring parameters and acquiring position information so as to generate a grounding parameter matrix; the association analysis module is used for screening suspected defect types, dividing a local overheating area, performing overheating cause judgment, constructing a coupling association matrix of a multi-physical field, performing evolution stage judgment in combination with historical data, and generating a preliminary mechanism hypothesis in combination with credibility rating; the collaborative reasoning module is used for constructing a dynamic knowledge graph and a constraint prediction network, constructing a collaborative reasoning mechanism based on a two-way real-time interaction channel, performing preliminary reasoning, and dividing early warning levels in combination with comprehensive confidence so as to perform operation and maintenance feedback; and the self-optimization module is used for carrying out directional iteration on the double engines by utilizing manual feedback and carrying out cross-line migration optimization according to different lines.

The invention provides an on-line monitoring system and method for the grounding current of a transformer iron core, and belongs to the field of data processing, and the system comprises a magnetic adsorption type dual-channel current sensor which is used for synchronously collecting a transformer iron core grounding current channel signal and a transformer clamp grounding current channel signal; the self-adaptive signal preprocessing module is used for carrying out self-adaptive differential processing through a self-adaptive differential coefficient and carrying out variable gain adjustment and self-adaptive filtering; the multi-dimensional feature extraction module is used for performing multi-dimensional signal feature extraction on the purified grounding current signal to obtain a multi-dimensional feature parameter set; the feature fusion module is used for performing constraint fusion on the multi-dimensional feature parameter set based on the corrected iron core eddy current loss physical model, and generating a comprehensive health evaluation index through an adaptive weight adjustment mechanism; and the intelligent diagnosis module is used for carrying out transformer iron core fault type identification, health state evaluation and trend prediction according to the comprehensive health evaluation index and the multi-dimensional characteristic parameter set to obtain a transformer iron core state monitoring result.

The invention relates to a ring main unit intelligent detection and fault early warning method and system. The method comprises the following steps: deploying an ultrahigh frequency sensor, an infrared thermal imager, an ultraviolet sensor and a high-frequency current transformer, and synchronously acquiring multi-modal data such as partial discharge, temperature distribution, corona discharge and grounding current of the ring main unit; carrying out feature extraction on the collected data, wherein the feature extraction comprises a time-frequency statistical feature and a temperature-load correlation feature of the partial discharge signal; the Dempster-Shafer evidence theory is utilized to carry out fusion calculation on the multi-source feature evidence, and confidence coefficients for insulation degradation, poor contact, arc faults and other fault types are obtained; arc fault prediction is carried out in combination with a long-short-term memory network model; and finally executing a grading early warning strategy according to the fault confidence. The problems of low detection reliability and fault early warning lag of a single sensor are solved, early accurate diagnosis and predictive maintenance of the insulation fault of the ring main unit are realized, and the operation safety and reliability of power equipment are remarkably improved.

The invention belongs to the technical field of power protection, and particularly relates to a station transformer grounding current synchronous synthesis method and system, and the method comprises the steps: carrying out the grouping according to the number of a station transformer, synchronously collecting the grounding branch current of each station transformer to obtain an original signal, carrying out the double identification, and carrying out the homologous copying; generating two paths of independent signals of frequency detection and phase calibration; frequency detection signals are grouped according to double identifications, the independent actual frequency of each station transformer is obtained after frequency detection processing, and a same-frequency sine dynamic reference signal is generated based on the independent actual frequency; performing phase alignment and compensation on the phase calibration signal and the corresponding reference signal according to the double identifiers to obtain a calibrated signal; according to the method, the phase calibration reference of each station transformer is completely matched with the actual frequency of the station transformer, the reason of phase reference dislocation caused by frequency fluctuation is eliminated from the source, and the accuracy of synthesizing the total grounding current in the station is improved.

The invention relates to the field of power system equipment detection, in particular to a residual magnetism measuring device and method for a large power transformer. The residual magnetism measuring device for the large-scale power transformer comprises the large-scale power transformer, a high-voltage bushing, a high-voltage neutral point bushing, a low-voltage bushing, an iron core outgoing line bushing, a first capacitor, a second capacitor, a detection impedor, a partial discharge instrument and a large-current generator, the capacitance of the first capacitor is 30pf-40pf and is matched with the capacitance of a transformer iron core, and the capacitance of the second capacitor is 300pf-400pf and is 10 times proportional to the capacitance of the first capacitor; the method comprises the following steps: carrying out a long-time induction withstand voltage and partial discharge test after a conventional test, measuring discharge amounts Q1, Q2 and Q3 at 0.5, 1 and 1.5 times of rated voltages, judging residual magnetism according to the difference value of the discharge amounts and an iron core grounding current, and if the residual magnetism exceeds the standard, magnetizing and demagnetizing by using a large current generator at the frequency of 150Hz. The method has the advantages that the residual magnetism is measured and evaluated in time, equipment faults are avoided, operation is easy and convenient, and adaptability is high.

The invention discloses a method and a system for diagnosing defects of a sheath grounding system under resonance voltage resistance of a power transmission cable. The method comprises the following steps: installing a sheath grounding current acquisition system; sequentially carrying out main insulation resonance voltage withstanding tests on three phases of the power transmission cable, and synchronously recording a grounding current waveform of a metal sheath by adopting a current acquisition system when each phase is subjected to voltage withstanding; processing the grounding current waveform by adopting a signal processing algorithm, and extracting a resonance component; and constructing a defect diagnosis matrix according to the resonance component, calculating a deviation between the defect diagnosis matrix and a standard matrix as a defect characterization value of the cable sheath grounding system, and obtaining a defect diagnosis conclusion of the sheath grounding system under the resonance withstand voltage of the power transmission cable. According to the method, the grounding current waveform of the metal sheath is synchronously acquired and analyzed in the main insulation resonance voltage withstand test of the three-phase cable, the resonance component is extracted, accurate identification of the defect is realized based on deviation calculation of the defect diagnosis matrix, and the detection sensitivity and the diagnosis reliability of the latent defect of the sheath grounding system before the cable is put into operation are improved.

The invention relates to a three-dimensional multi-source stray current interference characteristic analysis and identification method based on wavelet analysis. When a buried pipeline is subjected to electrical interference of different interference sources (such as high-voltage transmission line current, high-voltage direct-current grounding electrode grounding current, electrified railway and high-speed railway current, urban rail transit current and natural environment such as tidal interference current), the buried pipeline is subjected to electrical interference. And identifying and analyzing the pipe-to-ground potential and alternating current voltage fluctuation characteristics (amplitude characteristics and frequency characteristics) under stray current interference, judging the influence of interference sources on the safety and stability of the buried steel pipeline, solving the problems of analysis, identification and processing of multiple interference sources in the existing complex environment, improving the monitoring and treatment level of the interference sources of the buried steel pipeline, and improving the safety and reliability of the buried steel pipeline. Safe and reliable operation of the pipeline is ensured.

The invention discloses a cable fault monitoring and early warning method and system, and relates to the technical field of fault monitoring. The method comprises the steps that cable operation state parameters and environment parameters are collected in real time through a distributed sensor array, and the cable operation state parameters comprise cable temperature, three-phase current, partial discharge signals, insulation resistance, grounding current and mechanical vibration amplitude; the environment parameters at least comprise temperature and humidity corresponding to a cable laying environment; preprocessing the cable operation state parameters and the environment parameters, and generating a standardized feature matrix based on preprocessed multi-source data; inputting the standardized feature matrix into a pre-trained fault prediction model for processing to obtain a fault type and a fault risk index corresponding to the current operation state of the cable; and triggering an early warning mechanism according to the fault type and the fault risk index, and outputting corresponding fault position information.

The invention discloses a component separation calculation method, system and device for grounding current of a high-voltage alternating-current submarine cable and a medium. The component separation calculation method comprises the steps that current transformers are additionally arranged on submarine cable bodies at the head end and the tail end of an on-site high-voltage alternating-current submarine cable, a metal sheath grounding wire and an armored grounding wire; acquiring the current monitoring quantity flowing through the current transformer; performing vector calculation on the current monitoring quantity to obtain submarine cable core current vectors, metal sheath grounding current vectors and armor layer grounding current vectors at the head end and the tail end; vector calculation is carried out on the current vectors to obtain capacitance current components and electromagnetic induction current components of metal sheath grounding current and armoring grounding current, and the capacitance current leakage proportionality coefficient of the metal sheath and the armoring and the electromagnetic induction current proportionality coefficient of a grounding loop are calculated by further combining the submarine cable core current vectors; therefore, the grounding loop state of the metal sheath and the whole armored wire of the submarine cable and the main insulation and sheath external insulation state of the submarine cable are monitored.

The invention discloses a method for supporting high-frequency AC / DC component acquisition in core grounding current monitoring, which belongs to the technical field of transformers and comprises the steps of system initialization and communication establishment, continuous sample acquisition, period preprocessing and frequency spectrum and DC component calculation. The technical problem of accurately collecting and analyzing the high-frequency harmonic component and the direct-current component of the grounding current of the iron core at the same time is solved, the dual-channel sampling and digital signal processing technology is combined, on the basis of calculating the total current and the power frequency component, multi-dimensional monitoring and intelligent analysis of the running state of the transformer are achieved, and the fault diagnosis accuracy of the transformer is improved. According to the invention, various industrial scenes can be covered, missing detection of potential faults is avoided, and the fault early warning capability and the operation state judgment precision are improved.

The invention provides a current sampling system of a common-power power ground and a multi-channel solid state power controller, and relates to the technical field of electronics, and the current sampling system of the common-power power ground comprises a plurality of sampling modules, a corresponding number of switch modules and an MCU. And the ith sampling module is matched with the ith switch module to sample the ith load current. And the other end of the load is connected with the positive electrode of the power supply through the switch module. The sampling unit of the sampling module is connected in series between the switch module and the positive electrode of the power supply. The sampling reference end of the sampling module and the grounding end of the MCU are connected with the negative electrode of the power supply. The MCU controls the conduction state of the switch module, the sampling module samples the load current when the switch module is conducted, converts the load current into a voltage signal and outputs the voltage signal to the MCU, and the current sampling circuit solves the problems that a current sampling circuit in the related technology is high in cost and large in size.

A method for estimating the insulation resistance of power equipment in an uninterruptible state without using a sound wave signal is provided. [Solution] The method for estimating the insulation resistance of electric power equipment according to the present invention includes the steps of: (a) obtaining measured target data, which is the actual measured value of either the ground current value when the target electric power equipment, which is an epoxy-molded electric power equipment to be measured, is in a live-line state, or the electromagnetic wave intensity emitted from the target electric power equipment in a live-line state; (b) calculating a measured gradient value corresponding to the gradient of the rising edge of the measured target data; (c) reading out correlation information between the gradient of the target data recorded in advance and the surface insulation resistance value of the epoxy-molded electric power equipment; (d) deriving a surface insulation resistance value corresponding to the measured gradient value based on the correlation information; and (e) determining an estimated value of the surface insulation resistance of the target electric power equipment based on the surface insulation resistance value derived in step (d).

The invention discloses a transformer iron core insulation fault distinguishing method based on electromagnetic acoustic cross-modal fusion, which comprises the following steps: acquiring iron core grounding current, UHF electromagnetic signals and acoustic signals, fusing the acquired iron core grounding current, UHF electromagnetic signals and acoustic signals to obtain fusion features, processing the UHF electromagnetic signals and acoustic signals to obtain a transformer iron core insulation fault distinguishing result, and distinguishing the transformer iron core insulation fault distinguishing result. And respectively obtaining a final fault coordinate and an acoustic positioning coordinate, carrying out signal-to-noise ratio weighted fusion on the final fault coordinate and the acoustic positioning coordinate to obtain a fault three-dimensional coordinate after final fusion, processing the fusion feature and the fault three-dimensional coordinate after final fusion, and outputting a final diagnosis report. The cross-modal attention mechanism is introduced, the purified iron core current, the UHF electromagnetic signal and the acoustic signal are deeply fused, the iron core and insulation fault distinguishing accuracy is remarkably improved, and the fault diagnosis precision and stability are enhanced.

The invention provides a current-sensitive resonance eliminator driven by grounding current, and belongs to the technical field of grounding protection. The current-sensitive resonance eliminator is used for being connected between a neutral point of a voltage transformer of a distribution network system and the ground, and is structurally characterized in that a high-voltage lead, a circuit board, an electromagnetic switch and a low-voltage connecting line are electrically connected in sequence from top to bottom and are arranged in an inner cavity of an insulating sheath, the low-voltage connecting wire is led out from the tail of the electromagnetic switch; the high-voltage lead is connected with a wiring terminal of a neutral point of the voltage transformer The low-voltage wire holder is sleeved at the bottom of the insulating sheath; the low-voltage connecting wire is connected with the grounding end through the low-voltage wire holder; a current-sensitive resistor is arranged in the circuit board; when the zero-sequence current of the neutral point of the system is increased suddenly, the resistance value of the current-sensitive resistor is increased suddenly to reduce the loop current; an electromagnetic coil in the electromagnetic switch is connected with a low-voltage connecting line, the electromagnetic switch is driven to be disconnected when grounding current large enough flows through the electromagnetic coil, and the normally-closed state is automatically recovered after a safe duration.

The invention provides a transformer core clamp grounding current monitoring and dynamic suppression method, and belongs to the technical field of transformers, and the method comprises the steps: collecting high-precision real-time data through arranging a plurality of uniformly-distributed magnetic flux measurement points on a current sensor, constructing a multi-dimensional data set in combination with the environment temperature, humidity and load change conditions, and carrying out the dynamic suppression of the grounding current of a transformer core clamp; feature fusion and prediction analysis are carried out by using a UNet architecture-based dynamic suppression prediction model, model parameters and hardware equipment configuration are adaptively adjusted through a gating weighting function according to a confidence evaluation result, and an optimal control parameter adjustment value is calculated by using a current control optimization function; continuous optimization of a control strategy is realized through iterative calculation and closed-loop feedback, and finally accurate dynamic suppression control is executed by using a power electronic device, so that the technical problem that accurate dynamic suppression of the grounding current of the transformer core clamp is difficult to realize in a complex and changeable environment is solved.

The invention relates to the technical field of electrical safety, and discloses a current monitoring and shielding leakage response method and system for SNELPD water immersion protection. According to the invention, the original current waveform is monitored in real time, so that the grounding state characteristic quantity is acquired according to the grounding current waveform data and the leakage current waveform data, and the final potential offset and the potential trend characteristic quantity are analyzed from the shell potential waveform, so that the insulation resistance change caused by water immersion can be captured earlier and more sensitively; then, a coupling mechanism and an evolution law between current and potential characteristics are mined, a comprehensive risk index is obtained, high-risk coupling states such as grounding efficiency reduction and potential accelerated drifting are accurately captured, the problem that in the prior art, multi-parameter internal relevance and a diagnosis blind area of a co-evolution law cannot be revealed is solved, and the diagnosis accuracy is improved. The accuracy and the reliability of early recognition of '0 potential' damage and shielding leakage risks caused by soaking of the SNELPD equipment are remarkably improved.

The utility model relates to a leakage current detection device and an inversion device, the leakage current detection device comprises a pulse signal generation module, a transformer, an energy storage module, a current transformer, a sampling module and a filtering module, a first end of a primary winding of the transformer is connected with the pulse signal generation module, and a second end of the primary winding is grounded through the energy storage module; a first end of a secondary winding of the transformer is connected with a first end of a secondary coil of the current transformer, a second end of the secondary coil is grounded through the sampling module, a second end of the secondary winding is grounded, a magnetic core of the current transformer is sleeved on a power line to be detected, and the filtering module is connected with the second end of the secondary coil. The filtering module can filter out signals whose frequency is greater than or equal to the frequency of the pulse signals, and retains signals induced based on the leakage current, thereby achieving the detection of the leakage current, and facilitating the improvement of the working reliability of the power equipment where the to-be-detected power line is located.

The invention relates to a fault positioning method and device for a power distribution network and computer equipment. The method comprises the following steps: acquiring a current-to-ground data set and a zero-sequence current data set of each detection node in a fault line; the fault line is one of a plurality of power transmission lines; according to the earth current data set of each detection node, a to-be-detected line is determined from the fault line, the to-be-detected line comprises at least one to-be-detected section, and the to-be-detected section comprises two adjacent detection nodes; according to the zero-sequence current data set of each detection node in the to-be-detected line, determining the measurement distance of each to-be-detected section; the measurement distance of the section to be detected is used for representing the similarity between the zero-sequence current data sets of the two corresponding detection nodes; and determining a fault section of the power distribution network from the detection sections according to the measurement distance of each section to be detected. By adopting the method, the fault point in the fault line can be accurately positioned.

The invention relates to the technical field of current calculation, and discloses a digital compensation grounding current calculation method and device, terminal equipment and a storage medium. The method comprises the following steps: when a current signal of any phase of a three-phase current is obtained, obtaining a sampling value, a gain coefficient and a bias coefficient of a channel where the current signal is located and a sampling moment of the current signal; firstly calculating the bias error of the bias coefficient, then calculating the gain error of the gain coefficient, and finally calculating the phase error at the sampling moment; and compensating the sampling value according to the bias error, the gain error and the phase error to obtain a compensated three-phase current, and calculating a grounding current based on the compensated three-phase current.

The invention provides a power distribution network grounding fault active positioning method based on flexible regulation and control of a grid-connected converter. The method comprises the following steps: obtaining a fault node to-ground current; determining an arc extinction current injected by the grid-connected converter based on the current to ground of the fault node; determining a switching signal of a fourth bridge arm of the grid-connected converter based on the arc extinction current; collecting electrical state parameters of the regulated power distribution network; and determining the distance between a fault point and a bus based on the electrical state parameters of the power distribution network. According to the method provided by the invention, accurate positioning is realized by utilizing the inherent characteristic that the voltage of the fault point is effectively inhibited after regulation and control. Compared with the existing fault positioning method, the method has the advantages that the accurate positioning of the grounding fault is realized on the premise of not depending on the fault occurrence time and an expensive measuring unit, and the problems of electric energy quality and electric arc after-combustion cannot be generated.

The invention discloses an overhead transmission line fault detection and classification method based on discrete wavelet transform and a time sequence convolutional network, and relates to the technical field of electronics. The method comprises the following steps: acquiring original signals of three-phase current and grounding current of the overhead transmission line, and carrying out normalization processing and moving average filtering preprocessing; discrete wavelet transform (DWT) of a Daubechies wavelet basis function Db4 is adopted to perform multi-scale decomposition on the preprocessed signal, a high-frequency detail coefficient is extracted, and a multi-channel time sequence input vector is constructed; and inputting the input vector into a time sequence convolutional neural network (TCN). According to the method, fault features are efficiently extracted through DWT, time sequence data are accurately modeled through TCN, the problems that a traditional method is low in accuracy, slow in response and weak in anti-interference capacity in a complex fault scene are solved, the fault classification accuracy is 99.9%, the parallel computing capacity is high, training is stable, the method can adapt to different fault conditions, and the method is suitable for large-scale popularization and application. And the operation reliability and the intelligent protection level of the power system are effectively improved.

The invention discloses a parallel converter transformer fault identification method, system and device and a medium, and the method comprises the steps: obtaining the operation parameters of a parallel converter transformer; wherein the operation parameters are a first parallel converter transformer grid-side phase current self-produced zero-sequence current integral value IY0Y10, a second parallel converter transformer grid-side phase current self-produced zero-sequence current integral value IY0Y20 and a parallel converter transformer grid-side neutral point grounding current IGNDY; when the operation parameters meet the first judgment condition or the second judgment condition, it is judged that a fault occurs; wherein the first judgment condition is that IY0Y10 is greater than or equal to I0set or IY0Y20 is greater than or equal to I0set, and I0set is a preset parameter of the amplitude of the zero-sequence current; the second judgment condition is that IY0Y10 is more than 0 and less than I0set, IY0Y20 is more than 0 and less than I0set, and Kset is a preset parameter of the distribution symmetry of the zero-sequence current. The problem of poor backup protection sensitivity of the parallel converter transformer neutral point connection and grounding system can be solved, the transformer protection action can be started in time, so that the transformer is protected, and the backup protection sensitivity of the parallel converter transformer is effectively improved.

The application describes a PV energy generation installation having a central inverter unit (20) for attachment to a PV generator, the PV generator comprising a plurality of PV main strings (PVn) connected in parallel, each connected on the input side with the central inverter unit (20) via a DC line. According to the invention, a monitoring unit (21. N) is assigned to each pair of DC lines assigned to a PV main string (PVn), said monitoring unit comprising a differential current measuring device (8. N), a disconnect switch (9.n) and a monitoring control device (17. N), which is designed to switch the disconnect switch (9.n) and open the PV main string (PV.n) after a differential current threshold value IS, Diff is exceeded. In addition, a ground monitoring device (GFDI) (22) is arranged between one pole of the intermediate circuit (7) and a ground connection (13), which ground monitoring device comprises a ground current measuring device (10), a circuit breaking element (11) and a control device (12), the control device (12) being designed to detect a ground fault by exceeding a ground current threshold value IS after detecting the ground fault. If the earth fault still exists after the end of a defined delay time T, the circuit breaking element (11) is triggered after the delay time T. The invention further relates to a method for fault current monitoring of a facility of this type.

The utility model discloses a filter module and filter of filter, filter module includes: base shell has accommodating space, conductive shell sets up in the outside of base shell, conductive sheet includes current inflow end, current outflow end and the conductive sheet main body between current inflow end and current outflow end, and the conductive sheet main body is installed in accommodating space, and current inflow end and current outflow end extend to the outside of accommodating space, at least one built -in filter element, at least one built -in filter element one end is connected with conductive sheet electricity, and the other end is connected with conductive shell electricity and is grounded, at least one external filter element, at least one external filter element one end is connected with current inflow end electricity, and the other end is suitable for connecting in application equipment and is grounded. At least one built -in filter element is connected in conductive shell ground, and at least one external filter element is connected in application equipment and is grounded, can reduce the resistance of ground current flow.

An on-line monitoring and management system for a transformer iron core clamp relates to the technical field of transformer monitoring and comprises a monitoring and management module which is electrically connected with first flat iron and second flat iron. Wherein the monitoring management module is suitable for acquiring current data of a transformer iron core clamp; according to the invention, the grounding current of the transformer iron core clamp can be detected online in real time, and the early warning information can be pushed to the user side when the abnormality is identified, so that a worker can find the abnormality in time and handle the abnormality, and the working efficiency is improved. Meanwhile, current data of the transformer iron core clamping piece can be analyzed, and a corresponding treatment strategy is executed according to an analysis result, including the steps that the resistance value of the adjustable resistance module is adjusted to reduce the current of the transformer iron core clamping piece, so that the current is within a safe range; and early warning information is generated and pushed to a user side, so that the transformer is prevented from being damaged due to local overheating of the iron core caused by abnormal current.

The invention provides an end screen grounding current monitoring method, device and equipment, a medium and a program product, and relates to the technical field of power grids. According to the end screen grounding current monitoring method, the acquisition of the end screen grounding current including the multi-frequency domain characteristic of the converter station bushing is realized through the broadband current sensor, the sampling precision of the end screen grounding current is improved, the integral coefficient of the digital integral inversion algorithm is corrected, the integral error is reduced, and the sampling precision of the end screen grounding current is improved. Dynamic error compensation of equivalent voltage waveform data obtained through inversion of a corrected digital integral inversion algorithm is achieved, the monitoring precision and stability of the end screen grounding current are improved, and an effective means is provided for early warning of the insulation state of a converter station sleeve. And therefore, the requirements of early fault early warning of the target converter station sleeve and the requirements of intelligent operation and maintenance of the converter station sleeve on high-bandwidth acquisition and intelligent diagnosis can be met.

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.