728 results about "Grounding Malfunction" patented technology

The invention discloses a distribution network cable traveling wave fault early warning and positioning method and system, and the method comprises the steps: installing a device in a ring main unit, collecting a high-frequency traveling wave current and a power frequency current, and recognizing a grounding fault through a transient zero sequence comparison method and a high-frequency traveling wave polarity algorithm; weak traveling wave signals generated by insulation defects are monitored to carry out hidden danger early warning; traveling wave arrival time difference is measured through double-end distance measurement, and the position of a fault point is calculated in combination with line parameters; and early warning and positioning results are transmitted to a master station through 4G / 5G and 101 / 104 protocols. The system comprises a data acquisition module, a signal processing module, a fault positioning module, a hidden danger early warning module, a master station communication module and a master station module which work cooperatively. The method and the system are high in positioning precision, can realize accurate fault positioning and hidden danger early warning, support live-line installation, are suitable for various scenes, effectively solve the operation and maintenance problem of the distribution network cable, and improve the power supply reliability.

The invention relates to the technical field of cable positioning, in particular to a one-way grounding fault positioning method based on a signal injection method. The method comprises the following steps: installing an impedance detection unit at a grounding knife switch of a transformer substation, and injecting a controllable AC signal into a power transmission line through a built-in injection coil to enable the line to be in an open circuit state; collecting the injected current signal and performing frequency enhancement to extract the amplitude and phase of a target frequency component; zero-sequence impedance is calculated based on the injection voltage and current, and the zero-sequence impedance is compared with a preset impedance model to judge single-phase grounding; and when a fault is detected, determining a fault distance, a tower position and a grounding phase according to an impedance difference matching result, thereby realizing accurate positioning. According to the invention, by injecting the controllable AC signal into the power transmission line and combining frequency enhancement, phase self-calibration and impedance difference matching analysis, high-sensitivity detection, high-stability signal extraction and high-precision positioning of the single-phase earth fault are realized.

A power transmission line fault locating method and system based on traveling wave front fitting, and a storage medium and an electronic device. The method mainly comprises the following steps: on the basis of electrical parameters and control parameters of an actual project, constructing an electromagnetic transient simulation model for a power transmission system, setting metallic grounding faults along the entire length of a power transmission line at preset step sizes, and performing simulation (S1); recording fault occurrence moments, and, at a preset sampling frequency, collecting a voltage at an installation position of a fault locating device under each fault condition, so as to calculate a line-mode fault voltage under each fault condition (S2); performing function fitting on the line-mode fault voltage calculated at each fault position to obtain a fitting coefficient (S3); performing power function fitting on the fault positions and the fitting coefficients under various preset step size conditions to obtain a fault positioning function (S4); and when a power transmission line protection device of the actual project detects a line fault, performing fitting on a voltage collected by the fault locating device at a target sampling frequency to obtain a fitting coefficient, and substituting the fitting coefficient into the fault locating function to calculate a fault distance (S5).

The invention relates to an AC-DC integrated grounding fault positioning method and system, and the method comprises the steps: collecting the potential change data of a DC power supply system and the frequency characteristic data of an AC power supply system, and determining the electrical signal characteristics of stray current corrosion; decomposing the electric signal by using wavelet transform, and extracting direct-current and alternating-current components; determining a fault type according to the component amplitude; analyzing the potential gradient and the stray current flow direction in combination with a line topological structure, and determining the position of a fault point; measuring resistance to determine a grounding loop, and analyzing the correlation between corrosion distribution and electrical parameter characteristics; evaluating the influence of corrosion on the grounding path in combination with the material resistivity; according to the method, faults can be accurately recognized, fault points can be accurately positioned, the corrosion degree and the influence of the corrosion degree on the system can be evaluated, and effective support is provided for safe operation and maintenance of a subway power supply system.

The invention provides a power distribution network zero sequence mutual inductor wiring polarity on-line proofreading method and system. The method comprises the following steps that 1, an active inverter is directly connected between a phase line of a power distribution network or a neutral point of a grounding transformer and the ground, or is connected between the phase line of the power distribution network or the neutral point of the grounding transformer and the ground through a boosting transformer; step 2, performing closed-loop control on the active inverter to inject zero-sequence current into the power distribution network; 3, in the injection process, judging whether the wiring polarity of the zero-sequence mutual inductor is wrong or not; 4, if only one of the zero-sequence voltage transformer and the zero-sequence current transformer has a wiring polarity error, correcting by modifying a software flag bit; and step 5, each power distribution terminal and the accessory device thereof complete online calibration of the wiring polarity of the zero sequence mutual inductor. By applying the technical scheme, the problem that the grounding fault section positioning research and judgment result is wrong due to the wiring polarity error of the zero-sequence mutual inductor of the power distribution terminal and the accessory device thereof can be avoided, and the method has good engineering application value.

The invention discloses a charging pile ground fault intelligent monitoring method based on deep learning. The charging pile ground fault intelligent monitoring method comprises the following steps: S1, acquiring and storing electrical signals of a charging pile in a working state; s2, preprocessing the electrical signal to form a standardized data set; s3, extracting features by using a converter encoder, and obtaining local details and global dependence; s4, generating a candidate solution population, initializing parameters, and performing partial training to calculate an objective function; s5, based on an improved squirrel search algorithm, optimizing the candidate solution and obtaining an optimal hyper-parameter; and S6, carrying out full-quantity training on a converter encoder, constructing and deploying a detection model, and carrying out real-time detection and classification on faults. According to the invention, through combination of deep learning and an intelligent optimization algorithm, high-precision real-time monitoring and intelligent classification of the ground fault of the charging pile are realized.

The invention relates to the technical field of power system fault detection and diagnosis, in particular to a neutral point non-effective grounding power distribution network secondary overline fault detection method, device and equipment and a computer storage medium. According to the method for detecting the secondary overline fault of the neutral point non-effectively grounded power distribution network, an overline different-phase secondary fault equivalent circuit model is established, a fault electrical quantity analytical expression is solved, the characteristics of each stage of the secondary grounding fault under different fault phase sequences are analyzed, and the fault detection accuracy is improved. Corresponding different-phase secondary overline grounding fault detection logic is provided, the accuracy and reliability of the secondary grounding fault detection method are improved, and the method has positive significance in improving the power supply safety of the power distribution network.

The invention relates to the technical field of power system protection, in particular to an underground power distribution network single-phase grounding protection system and method based on a signal injection method. The system comprises a signal acquisition module, a measurement and control protection module and an online monitoring module. According to the invention, by injecting the independent direct current signal and combining a zero-sequence fundamental wave time sequence identification algorithm and a traveling wave distance measurement method, rapid detection, high-precision positioning and selective protection of the single-phase earth fault of the underground low-voltage power distribution network are realized, and the method is suitable for complex environments such as coal mines and metal mines; through insulation value on-line monitoring and electric leakage protection, the ground insulation value level of a line is reflected to the voltage change of an additional direct current signal and a reactor neutral point. A zero-sequence fundamental wave time sequence identification model is adopted for electric leakage fault judgment so as to judge the fault type. By outputting a relay signal, on-off control is performed on a protected branch, so that a fault line can be quickly cut off when a fault occurs, and equipment and a bus are protected from being damaged by the fault.

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 discloses a centralized FA broken line positioning criterion anti-interference method considering noise interference, and the method comprises the steps: collecting the data of each node of a power distribution network line in real time, building a sequence component network model under a single-phase broken line ungrounded fault, carrying out the dynamic threshold analysis of an electrical quantity through employing a sliding time window algorithm, and setting an electrical quantity mutation criterion. And constructing an anti-interference criterion, determining whether to trigger fault positioning or not through the anti-interference criterion when sudden change of electrical quantity occurs, determining a fault section in combination with topology analysis when fault positioning is performed, and controlling upstream and downstream switches to isolate the fault and transfer the fault to a non-fault section. According to the scheme, various noise interferences in the power distribution network are effectively suppressed, the accuracy of fault signal judgment is improved, and the conditions of misjudgment and missed judgment are reduced; secondly, considering different conditions of the power distribution network, performing targeted setting and adjustment on a sequence component network model, an anti-interference criterion threshold value and the like, so that the method can adapt to a complex power distribution network operation environment, and the reliability of fault positioning is improved.

The invention belongs to the technical field of power transmission and distribution of a power system, and particularly discloses a DR-MMC alternating-current and direct-current hybrid grid-connected system single-pole grounding fault ride-through method. The DR-MMC alternating-current and direct-current hybrid grid-connected system is constructed based on an offshore alternating-current wind power plant, an alternating-current collection submarine cable, an offshore direct-current wind power plant, a direct-current collection submarine cable, an offshore converter station, a direct-current sending-out submarine cable and an onshore converter station, and a connecting transformer valve side winding of the onshore converter station adopts high-resistance grounding. Judging whether the direct-current submarine cable has a single-pole grounding fault or not; and reducing the voltage instruction value and the power instruction value under the condition that the single-pole grounding fault occurs in the direct-current submarine cable, so that the transmission power of the grid-connected system is maintained at the preset transmission power, and the voltage and the current of the grid-connected system are maintained in a safe range. For a DR-MMC alternating current and direct current hybrid grid-connected system single-pole grounding fault, efficient and reliable fault ride-through can be realized through the method and the device.

The invention discloses a multi-branch hydro-generator stator grounding fault active arc extinction method, which comprises the following steps: S1, constructing an analytic function of a double-frequency fault potential by using a neutral point and a generator end voltage after a generator fault and combining a winding connection sequence; s2, deriving a linear constraint relation between a third harmonic fault potential real part and an imaginary part; s3, according to the linear constraint relation, in combination with the potential expression of each branch winding of the third harmonic, constructing a target function for fault solution, and solving a solution set based on the third harmonic characteristic quantity; s4, according to the fundamental wave fault characteristic equation, constructing a fundamental wave difference coefficient multi-solution screening criterion, and obtaining a unique solution of the double-frequency fault potential; s5, aiming at the multi-branch hydro-generator, constructing a neutral point dual-frequency power supply injection amount calculation formula; and correctly adjusting the injection amount of the neutral point double-frequency controllable power supply by using the screened double-frequency fault potential unique solution, and suppressing the voltage of the fault point to be 0 to realize arc extinction. According to the invention, reliable arc extinction of the multi-branch hydraulic generator can be realized.

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.

The invention discloses a grounding fault judgment method and system of a distribution line grounding system, a storage medium, electronic equipment and a computer program product. According to the ground fault judgment method, the ground fault judgment system determines a zero-sequence voltage abrupt change value and a zero-sequence voltage amplitude according to the collected zero-sequence voltage of the distribution line; under the condition that the zero-sequence voltage abrupt change value meets a preset zero-sequence voltage abrupt change value condition, determining a transient grounding judgment result and a zero-sequence admittance value according to the collected zero-sequence current and zero-sequence voltage of the distribution line; determining the classification condition of the zero-sequence admittance value according to the transient grounding judgment result; under the condition that the zero-sequence voltage amplitude meets a preset zero-sequence voltage amplitude condition, determining a zero-sequence admittance judgment result according to the classification condition of the zero-sequence admittance value and the zero-sequence admittance value; determining a grounding comprehensive result according to the transient grounding judgment result and the zero-sequence admittance judgment result; and determining a grounding fault condition of the distribution line according to the grounding comprehensive result and a preset grounding result condition.

Disclosed in the present invention is a ground fault device end-of-life self-test system. An induction coil and a neutral coil are used for sensing and acquiring a ground fault leakage current signal of a live wire or a neutral wire. A trip device is used for cutting off the power supply to a load in the event of a ground fault by driving a solenoid by means of a thyristor which is triggered by an IC1 to turn on. A manual test button is used for manually testing the function of a ground fault device. A rectifying circuit is used for rectifying an alternating current (AC) and outputting same to a direct current, and providing the direct current to IC1 and IC2 direct current power supplies. A ground fault detection circuit is used for completing ground fault detection, and controlling the drive to trigger the thyristor to turn on or off. A ground fault self-test control circuit is used for controlling the testing of a ground fault detection function without affecting normal ground fault detection and protection functions.

The embodiment of the invention discloses a high-resistance grounding fault active line selection method, device and system, relates to the technical field of power distribution network relay protection, and aims to solve the problems of low sensitivity and poor reliability of high-resistance grounding fault line selection. The method comprises the following steps: when fault starting is monitored, controlling a switch assembly connected with a damping resistor in a neutral point grounding loop to act so as to change the access state of the damping resistor; collecting bus zero-sequence voltage and zero-sequence current of each feeder line before and after the action of the switch assembly; calculating the zero-sequence active power variation of each feeder line before and after the action; and finally, comparing the zero-sequence active power variation of each feeder line to determine a fault feeder line. According to the invention, excitation is actively injected and the power variation is analyzed, so that the fault characteristics are enhanced, and the method has the beneficial effects of high sensitivity and high reliability.

The invention relates to the technical field of power distribution network fault detection, and discloses a power distribution network ground fault detection method, device and system, a medium and equipment, and the method comprises the steps: collecting a three-phase current signal on a power distribution network line, and judging whether the three-phase current signal meets a fault detection starting condition or not; when the condition is satisfied, inputting three-phase current waveform data in a preset duration before and after the starting moment into the convolutional neural network model to obtain a fault prediction probability of the power distribution network line; when the fault prediction probability is greater than a probability threshold value, generating a tripping instruction used for controlling opening of a circuit breaker connected with the fault line in the power distribution network line; and if the grounding fault is not detected to be isolated within the preset time, triggering the upstream protection node to execute backup tripping operation based on time differential delay. According to the method, pure current driving, intelligent identification, on-site quick action and differential backup are combined, high-precision identification of a power distribution network ground fault reduction dependence condition is achieved, and high-reliability small-range isolation of the ground fault is achieved.

The invention provides a resonant grounding system high-resistance grounding fault phase selection method based on frequency domain energy change, and belongs to the field of medium-voltage power distribution network fault detection. The invention provides a phase selection method based on frequency domain energy change in order to solve the problems that high-resistance grounding fault phase selection is difficult and power grid parameters are unbalanced in a resonant grounding system. The method comprises the following steps: firstly, acquiring a three-phase voltage signal of a fault line, and filtering the signal through a 4-order Butterworth low-pass filter to eliminate high-frequency noise interference; analyzing frequency domain energy change of the three-phase voltage before and after the fault by using fast Fourier transform, and extracting fault features; and finally, constructing a novel phase selection criterion based on the positive and negative values of the three-phase voltage frequency domain energy change, the frequency domain energy change vector and the projection thereof, and realizing fault phase selection. According to the method, the fault phase and the non-fault phase can be effectively distinguished, the method is particularly suitable for accurate phase selection of the high-resistance grounding fault, and the reliability and the safety of medium-voltage power distribution network fault diagnosis can be remarkably improved.

The invention discloses an arc suppression coil grounding fault positioning method based on a transformer substation line protection device, particularly relates to the technical field of system fault measurement, and is used for solving the problem of insufficient positioning precision caused by neglecting the nonlinear characteristic of a fault point arc channel in an existing fault positioning method. A specific frequency current signal is injected into a fault phase, the phase relation between fundamental wave and harmonic wave components in current collected by a line protection device is analyzed to obtain a phase coherence coefficient, a fault line distribution parameter model is established to obtain theoretical reference information, and a spatial gradient sequence is generated by calculating actual measurement and theoretical spatial entropy values. Identifying a line section corresponding to the abnormal abrupt change point, and finally determining a grounding fault point according to the spatial position of the line section with significant difference. The method can effectively overcome the influence of nonlinear attenuation and frequency dispersion effect on the positioning precision, and achieves the precise measurement and positioning of a single-phase grounding fault.

The invention discloses a direct-current cable single-pole grounding fault distance measurement method based on instantaneous power curve slope change, relates to the technical field of electrics, and has the advantages that external signal injection is not needed, positioning is realized directly through dynamic slope change of a power curve, the problems of complicated equipment and poor anti-interference performance of a traditional traveling wave method are solved, and the positioning accuracy is improved. According to the technical scheme, the method comprises the following steps that A1, voltage and current signals of conductor layers of a positive electrode and a negative electrode are obtained; a2, calculating a primary slope S0; a3, calculating an equivalent time point tz; a4, the maximum secondary slope pmax is calculated; a5, calculating a constant alpha and correction coefficients lambda and k; a6, an actual secondary slope pavg is obtained; and A7, obtaining a fault distance x. According to the method, the instantaneous power change of the head end of the cable is monitored, and the dynamic change of the power slope is combined, so that the fault position can be accurately identified in real time.

The invention discloses a ground fault simulation method under different scenes based on an RTDS platform, and aims to solve the problem that in the prior art, systematic deviation exists between simulation waveforms and a physical true model test on key transient characteristics due to isolated modeling of fault influence factors. According to the method, a high-fidelity simulation model fusing multi-dimensional fault variables and a dynamic coupling mechanism of the multi-dimensional fault variables is constructed on an RTDS platform, and multiple variables such as multiple grounding modes of a neutral point, fault positions, phases, transition resistance, three-phase unbalance degree, PT disconnection and in-phase two-point grounding are covered; and fault waveform output and multi-terminal collaborative closed-loop test which are highly consistent with that of a real-type test under full frequency bands and full working conditions are realized.

The invention discloses a successive grounding fault line selection method and system based on cosine similarity and Euclidean distance, and the method comprises the steps: respectively reflecting the differences between a first fault line and a sound line and between a second fault line and the sound line through the cosine similarity and the Euclidean distance according to the differences between a fault line and the sound line in a model; detection and line selection of cascading faults are realized, and the identification capability of a secondary fault line is effectively improved. The method is not influenced by factors such as a power distribution network topological structure, system parameters, fault positions and noise, and the reliability and the safety of operation of the power distribution network are greatly improved.

A non-isolated bidirectional high-voltage direct current battery charger is made compatible with a ground-fault circuit interrupter (GFCI) at the DC output by adapting the power converter to control, in response to voltage or current sensors, a net current difference between forward current and return current to remain below a threshold of the GFCI. This can be done without compromising safety in the case of actual ground faults.

The invention provides a power distribution network single-phase earth fault processing and fault rapid regional isolation system for solving the problems existing in power distribution network single-phase earth fault regional isolation at present. The system is composed of an improved compensation damping type active intervention arc extinguishing device installed on a transformer substation bus, primary and secondary fusion intelligent switches installed at all nodes of a distribution line, and a primary and secondary fusion intelligent switch intelligent control terminal. When a single-phase grounding fault occurs, a grounding switch of the compensation damping type active intervention arc extinguishing device is switched on, a primary and secondary fusion intelligent switch control terminal of each node of a power grid generates corresponding low-resistance, medium-resistance and high-resistance zero-sequence protection fixed values, and when the single-phase grounding fault occurs, zero-sequence current protection is started to realize rapid fault area isolation of the single-phase grounding fault.

The invention relates to a high-resistance grounding fault line selection method and device, computer equipment, a computer readable storage medium and a computer program product. The method comprises the following steps: collecting zero-sequence current of each line in the resonant grounding system in a preset time period when the resonant grounding system has a high-resistance grounding fault, accumulating the zero-sequence current of each line, correspondingly obtaining a zero-sequence current accumulation sequence of each line, and enhancing the current characteristic difference between a normal line and a fault line; and calculating the Kendall correlation coefficient between the zero-sequence current accumulation sequences of any two lines, and according to the Kendall correlation coefficient between any two lines, accurately determining a fault line and reducing misjudgment.

The invention discloses a power distribution network single-phase earth fault line selection method based on a hybrid arc extinction process. And the waveform change characteristics of the transient-steady-state zero-sequence voltage and the transient-steady-state zero-sequence current of each line in the hybrid arc extinction process are comprehensively utilized to realize the preliminary identification, re-determination and line selection result verification of the fault line. According to the method, the grounding fault line selection is accurate, meanwhile, the rapid input of the arc extinguishing device can be ensured, and the problem that the fault information of a traditional fault line selection method is influenced by arc extinguishing is solved to a great extent. The method is good in fault line selection safety and high in reliability.

The invention relates to the technical field of power distribution automation, in particular to an FTU local grounding fault judgment method and system. The method comprises the following steps: collecting a zero-sequence current signal I0 and a zero-sequence voltage signal U0 of the FTU as fault signals; key features of the fault signals are extracted to form feature vectors, and the feature vectors are matched with a dynamic feature library; on the basis of a matching result, calculating corresponding confidence coefficients through a transient state main criterion and a steady state auxiliary criterion; and fusing the confidence coefficients of the transient state main criterion and the steady state auxiliary criterion, judging whether a grounding fault occurs according to a fusion result, and if the grounding fault is judged to occur, triggering a fault processing action and updating the dynamic feature library. According to the method, the problems of poor feature library adaptation, high probability of false judgment and missed judgment due to single criterion and slow response depending on a master station caused by limited storage computing power of the existing FTU can be solved, and local efficient and accurate fault judgment is realized.

The present invention discloses a method and system for arc extinguishing of stator winding ground fault based on ground transition resistance, comprising the following steps: S1. Real-time acquisition of fundamental voltage of neutral point and machine end during normal operation and after ground fault; S2. Calculation of fault phase potential E A1 , and calculate the fault phase potential E A1 Neutral point to ground voltage U N1 Phase angle d S3. Construct an analytical equation for locating the fundamental-wave fault in the generator stator winding grounding, substituting the aforementioned measurements and calculations to complete the fundamental-wave fault location. S4. If multiple solutions are found for the fundamental-wave fault location, introduce a low-frequency injection calibration criterion to select the correct transition resistance value. S5. High-resistance grounding is used to extinguish the arc at the fault point. This invention significantly improves the accuracy and reliability of fault location, eliminates the possibility of misjudgment, and provides an accurate compensation basis for arc extinguishing.

The invention relates to the technical field of electrical measurement and wireless communication, in particular to an insulating rod current and voltage measurement system based on wireless transmission, and aims to solve the problems of low efficiency, limited range and high safety risk of existing single-phase grounding fault troubleshooting. The system comprises a portable measurement and acquisition subsystem and a handheld terminal analysis subsystem; the measurement and acquisition subsystem integrates high-precision synchronous sensing, electromechanical driving and wireless communication and can synchronously acquire current and voltage in a non-intrusive manner; and a multi-feature fusion and space-time association algorithm is embedded in the terminal analysis subsystem and is used for fault diagnosis and accurate positioning. The system can accurately measure and analyze the current and the voltage of the distribution line under the non-power-off and non-intrusive conditions, can quickly and accurately position the single-phase earth fault, remarkably shortens the troubleshooting time, and reduces the economic loss and the safety risk.

The invention discloses a power transmission line tree obstacle stage detection method and system, and relates to the technical field of power transmission line monitoring, and the method comprises the steps: obtaining a zero-sequence current signal and a zero-sequence voltage signal of a power transmission line, determining a corresponding operation state of the power transmission line according to the zero-sequence current signal and the zero-sequence voltage signal, and when the operation state is a grounding fault, carrying out the detection of the tree obstacle stage of the power transmission line; if yes, carrying out characteristic detection on the zero-sequence current signal by adopting a pre-trained zero-sequence characteristic detection model to obtain a corresponding change characteristic, and carrying out tree barrier stage detection on the zero-sequence current signal and the zero-sequence voltage signal according to the change characteristic to obtain a tree barrier stage corresponding to the power transmission line; the technical problems that in the prior art, whether tree obstacles happen to the power transmission line or not is monitored mainly through a remote video monitoring mode, but the method is long in monitoring time consumption, the power transmission line cannot be protected in advance, and the operation reliability of the power transmission line is reduced are solved.