599 results about "Grounding resistance" patented technology

The invention relates to the technical field of resistance measurement, in particular to a constructional engineering electrical grounding resistance detection system which comprises a path monitoring module, a delay judgment module, a path switching module, an interval regulation and control module and a data correction module. According to the method, the voltage stability is judged by collecting the path node voltage change value and the timestamp and calculating the voltage difference, precision screening is completed in cooperation with path state information, the abnormal fluctuation recognition capability is improved, the delay value change trend is combined with a period difference value comparison mode, and path stability evaluation is assisted; the path switching behavior is combined with feedback response and relay state recognition, the accuracy of channel switching is improved, the sampling interval is dynamically regulated and controlled according to delay change, clearer response characteristics are obtained in combination with waveform displacement mapping operation, the accuracy of data alignment is enhanced, and the accuracy of channel switching is improved. The whole process realizes a closed-loop processing structure of path identification, delay judgment, switching confirmation and waveform correction, and effectively improves the response consistency and time precision of ground resistance measurement.

The invention relates to the technical field of ground resistance detection, in particular to a single-core cable ground resistance detection method capable of resisting strong power frequency interference. High-frequency signals are injected in a non-contact mode through a coupling type capacitor clamp, background voltage and current signals are collected firstly, and injection frequency far away from power frequency and harmonic waves is selected through Fourier analysis; cancelling background noise by adopting a normalized least mean square adaptive filter to generate an enhanced signal; the signal is down-converted to a base band through digital quadrature demodulation, a Kalman filter estimates the amplitude and the phase in real time, and the state and noise parameters are periodically calibrated through a compressed sensing algorithm; and finally, loop impedance is calculated according to the voltage and current amplitudes and the phase difference to obtain grounding resistance. The method has the advantages of being non-contact, high in safety, strong in anti-interference capability, high in measurement precision and the like, and is suitable for monitoring the grounding state of the cable in a complex electromagnetic environment.

The invention relates to a motor power self-adaptive control method and system based on multi-dimensional sensor data, and the method comprises the steps: collecting multi-dimensional signals, such as ground resistance, motor temperature and battery voltage, in real time, carrying out the self-adaptive filtering and noise reduction, analyzing the correlation of all parameters through a multivariable decoupling algorithm, and determining a power demand weight; when it is detected that the ground resistance is a dominant factor, the system generates a load feature vector through weighted fusion, a database is matched to determine an optimal power target value, and PWM output is dynamically adjusted through a fuzzy control algorithm; and a closed-loop feedback mechanism continuously optimizes control parameters to ensure that the system quickly responds to sudden change of ground resistance. According to the method, intelligent adaptation of the motor power is achieved, the problems that adjustment lags behind and multi-parameter coupling processing is insufficient in the traditional technology are effectively solved, the stability of the sweeping robot under the complex ground working condition is remarkably improved, and the service life of the motor and the service life of a battery are remarkably prolonged.

The invention relates to the technical field of grounding resistance detection, in particular to a power transmission line tower grounding resistance monitoring system and a use method, and the system comprises a signal collection and correction module which collects and updates various parameters of each tower in real time, builds a mathematical model of environment parameters and grounding resistance values, and obtains the real-time environment parameters and the grounding resistance values after obtaining the real-time environment parameters; automatically correcting the measured resistance value by using the mathematical model; the fault early warning module is used for collecting historical monitoring data and calculating an abnormal risk probability in combination with real-time abnormal data; the fault positioning module is used for realizing accurate positioning of a fault tower through a time difference positioning method; and the remote control module is linked with the meteorological early warning platform, starts high-frequency monitoring before thunderstorm, and dynamically adjusts a ground resistance threshold value. The measurement value is automatically corrected through the linear regression model, interference of environmental fluctuation on resistance measurement can be effectively eliminated, and errors of traditional static measurement are reduced.

The invention discloses a lightning protection system for an environment monitoring station and a use method of the lightning protection system, and relates to the technical field of lightning protection, and the system comprises a multi-stage composite grounding module, an intelligent energy distribution module, a lightning current monitoring module, a surge protection module and a grounding impedance optimization module. Comprising a main grounding body, an auxiliary grounding body and a deeply-buried grounding electrode, the grounding resistance can be remarkably reduced, the lightning current leading-in efficiency can be improved, when lightning current passes through, the multi-stage grounding structure can effectively disperse the current, overload of a single grounding body is avoided, and meanwhile the grounding resistance of the grounding body is improved. The intelligent energy distribution module can dynamically adjust a current distribution strategy between different grounding bodies according to the magnitude of lightning current, ensures that the deeply-buried grounding electrode is preferentially conducted under the condition of strong lightning stroke, starts a parallel discharge mode of the main grounding body and the auxiliary grounding body under the condition of weak lightning stroke, and guarantees the safe operation of the environment monitoring station.

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 line tower grounding resistance intelligent detection system based on a TMR sensor technology, relates to the technical field of resistance detection, and solves the problem that a resistance signal is easily interfered by other signals or is influenced by temperature. According to the invention, superposition verification is carried out on waveforms of a resistance signal and an interference signal through a signal feature verification end, matching analysis of an extreme value segment and a virtual waveform is combined, an abnormal wave band and an interference source are accurately locked, and a reliable basis is provided for subsequent filtering; based on the peak point spacing (wavelength) and the transmission rate of the interference waveform, the interference frequency is calculated and a frequency interval is generated, so that an operator is supported to pertinently set filtering parameters, and specific frequency interference is effectively filtered out; by comparing the change characteristic ratio of the amplitude sequence to the temperature sequence, the response rule of the resistance value of the resistor changing along with the temperature is monitored in real time; and when the characteristic ratio does not decrease progressively according to the expected trend, a temperature change abnormal signal is triggered quickly.

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 a self-adaptive cable grounding resistance detector and a self-checking method, the self-adaptive cable grounding resistance detector comprises a shell, the shell is provided with an indicating lamp, a charging socket, a power switch and a single-ended grounding and cross-connected wiring socket, the shell is internally provided with a main control unit, and the algorithm of the main control unit has functions of function calibration, compensation calibration, power supply self-checking and the like. The main control unit is integrated on a circuit board, and can adapt to various grounding detections without replacing hardware by controlling automatic switching of a relay, so that the universality and the economical efficiency are improved. The device is controlled by an integrated circuit chip, has high precision and high environmental adaptability, and is suitable for single-end grounding and cross interconnection grounding resistance detection of a high-voltage cable. According to the invention, the self-checking process is completed before starting up, and through pulse current and standard resistance simulation detection, the measurement accuracy is improved, and personal errors are reduced.

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, which belongs to the technical field of the direct-current charging pile, provides a direct-current charging pile rapid detection diagnosis debugging system comprising a detection host, a multi-channel data acquisition module, an electric energy quality analysis module, an insulation resistance test module, a grounding resistance test module, a communication protocol analysis module, a temperature monitoring module and a fault simulation module. Parallel data acquisition is realized by adopting 16 independent analog signal acquisition channels and 8 digital signal acquisition channels, a parallel processing unit matched with the number of detection channels is started by utilizing a CUDA flow technology, preliminary fault screening is carried out at a GPU end through a rapid shallow model, and a layered diagnosis mechanism of accurate fault analysis is carried out at a CPU end through a deep model. And in combination with the charging pile fault identification model, real-time monitoring of the operation state of the charging pile and accurate identification and positioning of the fault are realized, and the technical problems of low real-time processing efficiency of multi-channel data and insufficient fault diagnosis accuracy are solved.

The invention discloses a 35kV line tower grounding online monitoring method and system, and relates to the technical field of tower grounding monitoring, and the method comprises the steps: collecting on-site initial parameters, and constructing a digital twin grounding model; determining a closed-loop injection current sequence based on the multi-step prediction model and a controller; current injection testing is carried out, grounding voltage and current are measured in real time, actual grounding resistance is calculated, a predicted value and an actually measured value are compared, and digital twinborn parameters are fed back and updated; when a preset period or an error threshold is triggered, executing self-calibration current injection, and calculating and correcting a model coefficient; and circularly executing and outputting a monitoring evaluation result. According to the method, low-energy-consumption and anti-disturbance closed-loop injection control is realized by adopting multi-objective optimization and a TiDE time sequence prediction model; an error feedback and self-adaptive calibration mechanism is introduced to ensure the continuous precision and stability of the prediction model; collection, prediction, control and calibration processes are executed periodically, and intelligent support is provided for ground resistance monitoring, fault early warning and operation and maintenance decision making.

The invention discloses a pile foundation external application device, a grounding pile foundation and a grounding system, the pile foundation external application device is cylindrical and comprises a base body layer, a transition layer and an external coating layer, the transition layer is wrapped by the external coating layer, the base body layer is wrapped by the transition layer, and the resistance of the transition layer is in index attenuation distribution from the resistivity of the base body layer to the resistivity of the external coating layer. Therefore, the substrate layer, the transition layer and the outer coating layer form a gradient conductive structure, the resistivity of the pile foundation external application device is in gradient distribution, the interface potential barrier is effectively inhibited, and the pile foundation grounding resistance is effectively reduced after the pile foundation external application device is externally applied to a grounding pile foundation, so that the grounding resistance of a grounding system is reduced, and the diversion performance of the grounding system is improved.

The invention discloses a self-voltage-stabilizing system and method for a power distribution network active and passive integrated ground fault regulation and control device, and the system comprises a fault judgment module, the active and passive integrated ground fault regulation and control device, an arc extinction reactive energy output module and a fault elimination module based on the active and passive integrated ground fault regulation and control device. The method comprises the following steps: measuring resistance to ground and capacitance to ground of a line during normal operation of a system, and judging whether a single-phase ground fault occurs or not; if the grounding fault does not occur, measuring the three-phase voltage and current of the load and performing split-phase injection of reactive compensation current; after the system has a single-phase earth fault, controlling the active and passive integrated earth fault regulation and control device to output active energy to be 0, and outputting reactive energy required by arc extinction according to reactive compensation current injected into the power distribution network at present; and reducing the injected arc extinction current after the time period t, and observing whether the neutral point voltage changes proportionally.

The utility model relates to the field of lightning protection detection, in particular to a grounding resistance testing device for lightning protection detection. Comprising a resistance measuring instrument, the upper surface of the resistance measuring instrument is electrically connected with a plurality of wires, the ends, away from the resistance measuring instrument, of two wires are electrically connected with probes, one side of the resistance measuring instrument is provided with an adjusting structure, the adjusting structure comprises a fixing plate, the fixing plate is fixedly connected with the resistance measuring instrument, and the side, away from the resistance measuring instrument, of the fixing plate is fixedly connected with a plurality of supporting plates; winding rods are fixedly connected to the upper surfaces of the multiple supporting plates, sliding grooves are formed in the surfaces of the supporting plates, and moving plates are slidably connected to the inner walls of the sliding grooves. The grounding resistance testing device for lightning protection detection provided by the utility model has the advantages that a plurality of wires are accommodated on the winding rod after the test operation at a designated place is completed, and the wound wires are limited by using the movable partition plate, so that the working efficiency of wire arrangement and accommodation is improved, and the next use is facilitated.

The invention relates to the field of power systems, in particular to a power cable cross interconnection grounding system live-line maintenance method and system. The method comprises the following steps: firstly, synchronously acquiring cable line load current, three-phase grounding ring current and grounding resistance at the head end and the tail end of a metal sheath of a crossed interconnection unit with ring current abnormity, and generating a real-time data set with a timestamp; extracting cable structure parameters based on a preset cable topology database, and dynamically associating the cable structure parameters with the real-time data set; constructing a multi-conductor transmission line equation model, calculating a theoretical circulation distribution value of each section of sheath, and generating a theoretical circulation map; carrying out matching analysis on the theoretical circulation map and actually measured circulation data, and determining defect types and positions; and finally, according to a defect positioning result, the maintenance operation is executed in an electrified state through the insulating mechanical arm, and the stability of the grounding impedance of the system is maintained through the bypass grounding device. The problems that in the prior art, the live detection function is incomplete, and defects cannot be rapidly and accurately positioned are solved.

The invention provides a grounding resistance online monitoring method and system, a storage medium and electronic equipment, and relates to the technical field of grounding resistance monitoring. According to the technical scheme provided by the invention, the geological type of the transformer substation and the reference resistance threshold curve corresponding to the geological type are acquired, the second grounding resistance value is calculated by combining the first grounding resistance value of the branch node in the grounding network, and the comprehensive resistance correction amount is determined based on the soil characteristic parameters; personalized adjustment of the reference resistance threshold curve is realized, and a target resistance threshold curve suitable for a specific transformer substation is obtained. The actually measured third grounding resistance value is compared with the corresponding threshold value of the final resistance threshold value curve, the abnormal state of the grounding network can be accurately identified, the problems of false alarm and missing alarm caused by a fixed threshold value are avoided, and the accuracy of online monitoring of the grounding resistance is improved.

The invention discloses a resistance-reducing grounding mechanism and an optimization method thereof.The resistance-reducing grounding mechanism comprises a grounding pile foundation, a grounding resistance-reducing cage, a grounding down lead and a corrugated external conductor wire, the grounding pile foundation is vertically buried underground, the grounding resistance-reducing cage wraps the grounding pile foundation in the horizontal dimension and the vertical dimension, and the grounding down lead is connected with the corrugated external conductor wire; the grounding down lead extends downwards from the ground to be connected to the grounding resistance reduction cage, and the corrugated external conductor wire is attached to the grounding resistance reduction cage. Therefore, the spatial three-dimensional wrapping design of the grounding resistance reduction cage can realize uniform diffusion in a larger range, the current diffusion capability of the grounding mechanism is improved, the external conductor wire with the corrugated structure increases the effective length and the surface area of the conductor, and the current diffusion capability of the grounding mechanism is further improved; and the grounding resistance reduction cage and the corrugated external conductor wire form a multi-layer conductive channel, so that the current discharge speed can be further increased, the grounding resistance value is reduced, and the transient overvoltage during lightning stroke is reduced, thereby ensuring the safe and stable operation of a power system.

The invention provides a method and application for a grounding grid resistance reduction project in a plateau frozen earth region and a grounding grid structure, and relates to the technical field of grounding engineering, and the method comprises the steps: carrying out the grounding grid discharge distribution analysis, and determining a region with higher current discharge density; carrying out grounding grid optimization treatment on the region with the relatively high current release density, including digging ground grid surface covering soil, exposing the ground grid surface, and pouring a liquid flexible resistance reducing material on the ground grid surface; and waiting for solidification of the liquid flexible resistance-reducing material to form an electric conductor combined with the soil. The invention further provides an optimization method for drilling deep holes in the four corners of the ground screen and filling the deep holes with the liquid flexible resistance reducing material to form the vertical grounding electrode. Under the condition that the original grounding grid structure is not changed, the grounding resistance in the plateau frozen soil area is effectively reduced, the performance stability of the grounding grid is improved, and meanwhile the grounding grid has the advantages of being flexible in construction, low in cost, high in adaptability and the like and is particularly suitable for grounding grid transformation projects in extreme environments such as plateau frozen soil.

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 relates to a method and device for judging whether a grounding mechanism of a switch cabinet works normally or not, a grounding resistance online measurement module is arranged on a grounding knife switch structure of the switch cabinet, the resistance value of the grounding resistance is detected in real time, and whether grounding is correct or not is judged by judging whether the grounding resistance is in a normal range or not; the grounding resistance on-line measurement module is internally provided with a switch-on grounding state detection algorithm based on deep fusion of a neural network and Kalman filtering. According to the method, multiple factors such as the cumulative closing times, the contact resistance change rate, the oxidation coefficient, meteorological interference and the temperature are comprehensively considered, a dual-network self-adaptive modeling and federated Kalman filtering framework is adopted, high robustness and nonlinear processing capacity are achieved, and whether the switch cabinet grounding mechanism works normally or not is judged with high accuracy.

The invention discloses a transmission, transformation and distribution equipment grounding resistor corrosion state detection device and method, and relates to the technical field of power monitoring, and the device comprises a multi-source feature collection module which is used for collecting data based on a corrosion influence factor and generating a corrosion state index, and a resistor time sequence interception module which is used for monitoring and intercepting a dynamic grounding resistor time sequence, the resistance time sequence comparison module is used for comparing with the reference grounding resistance to obtain a second corrosion state index, the corrosion early warning module is used for sending out an early warning signal when the index exceeds the standard, and the corrosion emergency processing module is used for taking corresponding emergency processing measures according to the early warning signal. The technical problem that early warning lags due to the fact that existing transmission, transformation and distribution equipment grounding resistor corrosion state monitoring depends on manual inspection or regular detection and lacks real-time and comprehensive evaluation means is solved, and the technical effects that the corrosion state is evaluated in real time and early warning timeliness is improved through multi-source data collection and dynamic monitoring are achieved.

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

A method and insulation monitoring arrangement for insulation monitoring of an electric installation operated using a supply direct voltage and has a first insulation resistance between the positive active conductor and ground and a second insulation resistance between the negative active conductor and ground as well as a functional grounding between the negative active conductor and ground by a ground resistance. The method involves measuring a ground current, which flows in the path of the functional grounding, by means of a DC measuring device; measuring the supply direct voltage by means of a voltage measuring device; computing the first insulation resistance from the supply direct voltage divided by the ground current by means of a computing unit; the condition is valid during operation of the electric installation that the second insulation resistance being at least 100 times greater than the ground resistance.

The invention discloses a signal identification method and device, electronic equipment and a storage medium, and relates to the technical field of computers, the identification method is applied to a backboard in target equipment, and the backboard is connected with a mainboard through a first connector; the backboard is connected with the switch through the second connector. The first connector is connected with the voltage division circuit; the second connector is connected with a grounding resistor, and is used for receiving a signal which is output after voltage value conversion is carried out on a mainboard signal sent by the mainboard port by the voltage division circuit, or receiving a second voltage signal which is output after voltage value conversion is carried out on a switch signal of the switch by the grounding resistor, and switching the switch on the basis of the received voltage signal; and determining the voltage value of the voltage signal so as to identify the source of the voltage signal according to the voltage value. As the voltage value is wide in recognizable range relative to the address bit, the technical effects of increasing the expandability of the target equipment and improving the performance of the target equipment can be achieved, and the technical problem that the expandability of the current target equipment is limited is solved.