203 results about "Power systems protection" patented technology

The invention discloses an intelligent substation relay protection evaluation method based on multi-source data fusion, and relates to the technical field of power system protection, and the method comprises the steps: obtaining the working state information of all relay protection equipment in a substation; constructing a fusion planar graph of multi-source data in the transformer substation based on an equipment topological structure graph and real-time sensor data in the transformer substation; performing real-time state monitoring and evaluation on each relay protection device of the transformer substation by using the fusion plane graph of the multi-source data in the transformer substation, and generating a health evaluation model of the relay protection devices; generating fault early warning information of the transformer substation relay protection equipment; and the response time, the action accuracy and the equipment stability of the relay protection equipment in the transformer substation are evaluated and optimized through the data fusion and evaluation model. According to the invention, the real-time monitoring and fault early warning capabilities of the relay protection equipment are improved, the maintenance and management strategies of the equipment are optimized, and powerful technical support is provided for safe operation of a power system.

The invention discloses a dynamic closed-loop management method for bridge-shaped contact performance, and relates to the technical field of power system protection. The method comprises the following steps: S1, a dynamic sensing process: acquiring multi-source dynamic parameters of a bridge-shaped contact in a non-intrusive mode; s2, a quantitative evaluation process: fusing the multi-source dynamic parameters and the static parameters, and calculating a health index or a health level of the contact through a preset model; s3, adaptively optimizing the process, dynamically adjusting the closing energy or protection parameters of the circuit breaker according to the health state, and compensating the performance change of the contact; and S4, a predictive maintenance process: performing trend extrapolation based on the historical data of the health index, predicting the residual life and generating a maintenance suggestion. The processes are sequentially connected and cyclically iterated to form dynamic closed-loop management, so that the problems of one-sided parameter sensing, inaccurate evaluation, fixed parameters and maintenance lag in the prior art are solved, the operation reliability of the bridge-shaped contact is improved, the service life of equipment is prolonged, and the operation and maintenance cost is reduced.

The invention provides a photovoltaic power station anti-islanding protection method, device and equipment and a storage medium, and relates to the technical field of power system protection. The method comprises the following steps: controlling an inverter of a photovoltaic power station to continuously inject a disturbance signal into a photovoltaic grid-connected system, and monitoring power measurement data of a grid-connected point after the disturbance signal is injected; when the electric power measurement data exceed a preset threshold range, determining that the electric power measurement data is abnormal; determining an abnormal duration in combination with historical power measurement data; and if the abnormal duration is greater than the abnormal duration threshold, the grid-connected switch is controlled to be switched off, and anti-islanding protection of the photovoltaic power station is realized. According to the method, the disturbance signal is actively injected, the detection sensitivity is remarkably improved, the abnormal duration is analyzed in combination with historical data, the islanding effect and instantaneous fluctuation are effectively distinguished, misjudgment is reduced, the islanding detection precision is remarkably improved, it is ensured that the islanding effect can be recognized and processed timely and accurately, and the islanding detection efficiency is improved. And the safety and the reliability of the operation of the photovoltaic power station are further enhanced.

The invention specifically relates to a standardized fuse fault monitoring and diagnosis system, and relates to the technical field of power system protection equipment monitoring. A signal processing and impedance spectrum calculation module; an intelligent diagnosis and state evaluation module; and a benchmark management and personalized tracking module. According to the invention, controllable micro test signals are actively injected to obtain frequency domain impedance fingerprints, and accurate capture of microscopic degradation is realized; non-intrusive coupling and signal injection are adopted, the topology of a main loop does not need to be changed, the inherent protection characteristic of the fuse is guaranteed, and power frequency interference can be penetrated; the recognition amount of budding faults such as contact oxidation and melt corrosion is improved in advance, and power failure accidents caused by fault expansion are avoided.

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 system protection equipment testing, in particular to an online testing method for a backup protector special for a surge protector, and aims to solve the problem that in the prior art, spectral characteristics under actual fault conditions such as lightning stroke or short circuit cannot be comprehensively reflected only by depending on power frequency testing. A high-frequency dynamic frequency sweeping signal is injected through the non-contact coupling unit, a multi-source signal fusion judgment mechanism is combined, the physical contact risk is avoided, meanwhile, real working condition simulation is achieved, the problems of test distortion, weak anti-interference capacity and aging monitoring deficiency in a traditional method are effectively solved, and the test accuracy is improved. The method has the technical effect of remarkably improving the test safety and accuracy.

The invention discloses a protection setting calculation and optimization method based on an intelligent power plant management platform, and relates to the technical field of power system protection. By constructing a platform and equipment communication link, integrally collecting and preprocessing internal and external parameters, and dynamically updating topology and model parameters in combination with a switch state, the problem that a traditional static model is difficult to adapt to operation changes is solved, the timeliness and accuracy of the model are improved, a multi-scene database is constructed in a classified mode, labels are labeled, and the efficiency is improved. Fault current distribution is accurately calculated, constant value adaptability verification is carried out, constant value optimization is carried out in combination with a multi-objective optimization algorithm and sensitivity analysis, limitation of single-scene constant values is avoided, constant value conflicts under different scenes are reduced, reliability of initial constant values is guaranteed, sensitivity analysis is superposed, it is ensured that the constant values are still reliable during parameter fluctuation, and the reliability of the constant values is improved. The risk of protection operation refusal and misoperation is reduced, a constant value is issued, the device state is monitored in real time, evaluation indexes are calculated, the constant value is controllable in the whole process, and stable operation of the device is guaranteed.

The invention belongs to the technical field of power system protection, and discloses a circuit breaker fault diagnosis method and system, and the method comprises the steps: obtaining a real-time vibration signal parameter and a current signal parameter in the operation process of a circuit breaker; identifying an aging drift signal cluster according to amplitude fluctuation in the vibration signal parameters and phase deviation in the current signal parameters; acquiring the drift response level of the aging drift signal cluster at each moment according to the signal direction change and amplitude stability of the aging drift signal cluster; screening a high-priority diagnosis cluster based on the drift response level; according to the drift response level of the high-priority diagnosis cluster at each moment and the current signal parameter of the high-priority diagnosis cluster at the same moment, obtaining a diagnosis guidance index of the corresponding diagnosis cluster; and dynamically adjusting a health baseline threshold value based on the diagnosis guidance index so as to realize adaptive diagnosis of the circuit breaker fault. And the accuracy of fault diagnosis of the circuit breaker is greatly improved.

The invention discloses a power distribution network short circuit fault diagnosis method and device based on a heterogeneous graph attention network and a medium, and belongs to the field of power system protection and control, and the method comprises the steps: building a heterogeneous power distribution network topological graph structure, and measuring the electric data of each node in the power distribution network topological graph; preprocessing the measured electric data and constructing a fault data set; constructing a power distribution network short-circuit fault diagnosis model based on the heterogeneous graph attention network; defining a training hyper-parameter and a loss function of the power distribution network short-circuit fault diagnosis model, and training the power distribution network short-circuit fault diagnosis model; and when a power distribution network fault occurs, preprocessing real-time measurement data, and inputting the data into the optimal power distribution network short-circuit fault diagnosis model to obtain prediction results of a node fault state, a fault category and a fault phase. According to the method, the fault of the power distribution network can be accurately and effectively diagnosed under the condition of distributed power supply deployment, and the method has relatively high diagnosis accuracy and robustness.

The invention relates to an electric energy coordinated distribution system capable of quickly clearing faults of a power distribution network, which belongs to the technical field of power system protection and control, and comprises the following steps: generating a regional reference impedance matrix in advance based on power grid static topological data and load flow calculation; the system comprises an instantaneous feature analysis module, an evolution trend analysis module, a system stability evaluation module, a collaborative response evaluation module, a fault type judgment module and a response strategy generation module, the fault recognition time is shortened, improvement is carried out compared with a traditional method, the collaborative response precision of the distributed power supply is improved, and the system reliability is improved. The power oscillation risk is reduced, the transient stability margin of the system is improved, and the anti-disturbance capability is enhanced; the fault power failure time is reduced, the distributed energy utilization rate is improved, the new energy consumption space is increased, and the updating period of traditional protection equipment is delayed.

The invention discloses an online detection method for a medium and low voltage direct current circuit breaker, and relates to the technical field of power system protection control, and the method comprises the following steps: S001, building a radiation echo spectrum distribution model during the switching operation of the direct current circuit breaker, calculating an interference intensity estimated value through collecting a current drop rate and a fracture voltage climbing rate, and calculating the interference intensity estimated value according to the current drop rate and the fracture voltage climbing rate; and extracting a disturbance frequency band with concentrated interference energy and generating a characteristic signal set for representing an interference propagation path. According to the method, a closed-loop anti-interference mechanism is constructed through feature modeling, interference recognition, signal correction and parameter optimization, the stability and accuracy of state judgment are improved, misjudgment and response failure caused by high-frequency interference are prevented, the method is particularly suitable for a complex parallel system and a frequent on-off scene, and the safety and the intelligent level of a direct-current system are effectively enhanced.

The invention relates to the technical field of power system protection, in particular to a power transformer protection method and system based on edge calculation. The method comprises the following steps: acquiring electric signal data through an edge transformer protection module; instantaneous morphological fitting and unsteady waveform regression are carried out on the collected data, and electric signal morphological data and unsteady waveform data are obtained respectively; extracting instantaneous entropy sequence feature data and pseudo-phase space reconstruction feature data; burst sensing is carried out based on the instantaneous entropy sequence feature data, event sensing is carried out based on the pseudo-phase space reconstruction data, and power burst sensing data and power event sensing data are generated respectively; and executing a protection strategy according to the multi-dimensional sensing result, and outputting at least one protection strategy execution data of transformer secondary side isolation, protection mode switching, abnormal suppression delay and dynamic threshold adjustment. According to the invention, dynamic identification and rapid response to the unsteady state event in the power system can be realized, and the intelligent protection capability of the mutual inductor is improved.

The invention discloses a drop-out fuse, and relates to the technical field of power system protection, and the drop-out fuse comprises an insulator, the middle part of the insulator is fixedly provided with a fixed installation plate used for installing a fuse, one end of the insulator is fixedly provided with a lower end contact, and the other end of the insulator is fixedly provided with an upper end contact. The lower end contact is fixedly provided with a lower wiring terminal, the upper end contact is fixedly provided with an upper wiring terminal, and the lower wiring terminal is rotatably provided with a fuse tube assembly used for power-off protection. The fuse tube assembly comprises a fuse outer tube, the lower end of the fuse outer tube is provided with a lower connecting tube connected with the lower end contact, the upper end of the fuse outer tube is provided with an upper connecting tube, and the upper connecting tube is provided with a conductive head conductively connected with the terminal duck tongue plate; the invention has the advantages that the fuse can be quickly switched without high-altitude replacement, and the fusing arc can be effectively isolated to protect the standby fuse assembly.

The invention discloses a multi-terminal traveling wave fault positioning method, system and device of a branch type power distribution network and a medium, and relates to the technical field of power system protection and control, and the method comprises the steps: constructing a static topological graph of a power grid, and constructing a reference node distance matrix; collecting traveling wave signals of the monitoring points; performing empirical mode decomposition on the acquired traveling wave signal to decompose the traveling wave signal into an intrinsic mode function component; screening all the intrinsic mode function components, selecting an optimal intrinsic mode function component, and executing Hilbert-Huang transform to lock the arrival time of the traveling wave head; calculating the distance difference between the fault point and each monitoring point, and constructing an average fault distance difference matrix; and constructing a fault branch judgment matrix based on the average fault distance difference matrix and the reference node distance matrix. According to the method, the problem that a traditional impedance method is highly sensitive to line parameters and transition resistance is solved, and the defect that a single-end traveling wave method is prone to generating positioning ambiguity in a branch network is overcome.

The invention provides a vacuum circuit breaker inrush current suppression method and system based on a voltage phase angle, and relates to the technical field of power system protection. Calculating a voltage phase angle difference value and analyzing historical data to obtain characteristic parameters; inputting the phase angle difference, the voltage amplitude, the system frequency and the historical characteristic parameters into a double-hidden-layer neural network, and outputting an optimal switching-on moment and a protection trigger sequence; when a switching-on instruction is received, the protection assembly is triggered immediately or in a delayed manner according to the optimal moment; after all the multi-stage protection assemblies are conducted, the circuit breaker body is controlled to be switched on; and adding the actual inrush current data to the historical data, optimizing the neural network model, and realizing continuous inrush current suppression.

The invention discloses a power distribution network protection method in the field of power system protection, and the method comprises the following steps: S101, collecting the multi-source data of a power distribution network in real time, collected multi-source information such as electrical quantity data, distributed energy output data, meteorological data, equipment state monitoring data, node voltage, current waveform, topological structure, distributed power output state and environmental parameters in a power distribution network is transmitted to a protection device or a control center through a communication network. Through application of multi-source information fusion and self-adaptive protection criteria, the protection device can judge faults more accurately, maloperation and refusal operation are reduced, the accuracy of power distribution network protection is improved, an intelligent reclosing strategy and implementation of distributed cooperative protection are adopted, and the safety of power distribution network protection is improved. The secondary impact and islanding effect of reclosing on the system are effectively avoided, the stability of the system is improved, and the safe operation of the power distribution network is guaranteed.

The present application relates to the technical field of power system protection, specifically to a multi-level protection setting value adaptive collaborative calculation method and system for distribution network. The method comprises the following steps: analyzing SVG and XML files to construct network topology graph and calculating short-circuit current of each switch node; adopting K-means clustering algorithm to cluster switch nodes and adaptively determining the number of clusters according to the range of short-circuit current; extracting representative paths and performing deduplication processing; identifying main switches according to the clustering results and calculating protection setting values, and distributing setting values to non-main switches by linear interpolation; and outputting complete protection setting value table. The present application realizes full-process automation of protection setting value calculation, significantly improves calculation efficiency and accuracy, has strong adaptive ability, and can quickly respond to changes in power grid structure and operation mode adjustment.

The invention provides a thunderstorm cloud spatial and temporal distribution identification method based on image processing, belongs to the field of novel power system protection, and mainly utilizes the characteristic that thunderbolt continuously generated in the continuous development process of thunderstorm cloud still presents concentrated distribution characteristics in longitude and latitude distribution characteristics. After a thundercloud thunderbolt data set is subjected to time scale stripping, thundercloud activity ranges represented by high-density thunderbolt points are integrated by utilizing a morphological processing means to obtain development time and activity space of each thundercloud, and thundercloud activity indexes acquired by a thunderbolt positioning system are utilized to obtain thundercloud thunderbolt data. And carrying out real-time judgment on thundercloud risk capable of causing lightning stroke of the fan matrix of the new energy power plant. The invention aims to solve the defects that a high-dimensional data set cannot be identified and thundercloud has space stacking in different time periods and is difficult to extract in the current generally applied density clustering method, so that the accuracy of thundercloud development time and activity range extraction is improved.

The utility model discloses an electric power system protection device, and relates to the technical field of protection devices, the electric power system protection device further comprises a supporting plate, open grooves are formed in the two sides of the top of the supporting plate in a penetrating mode, grooves are formed in the two sides of the inner walls of the open grooves, anti-falling mechanisms are arranged in the open grooves, the anti-falling mechanisms comprise connecting plates, the connecting plates are located in the grooves, and the connecting plates are arranged in the grooves. A supporting rod is fixedly connected to one side of the bottom of the connecting plate, a mounting frame is fixedly connected to the bottom of the supporting rod, a threaded groove is formed in the bottom of the mounting frame in a penetrating mode, a threaded rod is connected into the threaded groove in a threaded mode, and a clamping plate used for clamping and fixing a cable is fixedly connected to the top end of the threaded rod. When a worker shears off a cable erected in the air for maintenance, the cable can be clamped and fixed, and the situation that after being sheared off, the cable directly falls off to hurt pedestrians, and consequently safety accidents are caused is prevented.

The invention relates to the technical field of power system protection automation, and provides a data encryption collection method and system for relay protection equipment, and the method comprises the steps: automatically carrying out a handshake process after a data encryption collection device and the relay protection equipment are connected through a network interface, in the process, the data encryption and collection device and the relay protection equipment both encrypt and decrypt a transmission message; the data encryption and collection device and the relay protection equipment enter a collection result reporting process after completing a handshake process, and the relay protection equipment generates a data collection result after collecting and encrypting local data and sends and reports the data collection result to the data encryption and collection device; after completing a collection result reporting process, the data encryption collection device and the relay protection equipment enter a ciphertext transmission process, the relay protection equipment fragments a ciphertext after local data encryption and then sends the ciphertext to the data encryption collection device, and the data encryption collection device stores the received ciphertext. The method can ensure that the power grid data information is not leaked.

The application provides a primary and secondary system auxiliary decision-making method based on a system protection fault scene, comprising the following steps: obtaining a communication channel existing fault from a database, and storing the communication fault and the device fault into a power system protection typical fault scene library; matching and checking the power system protection typical fault scene with a power system expected fault scene, and judging whether the risk of the power system protection typical fault scene is acceptable; if the risk of the power system protection typical fault scene is not acceptable, then reselecting other routing paths through the secondary side system; if a suitable other routing path cannot be selected, then adjusting an emergency control strategy through the secondary side system to find a new feasible strategy; if the new feasible strategy cannot be found, then adjusting an auxiliary decision-making through the primary side system until the risk is acceptable, and the application realizes the effective cooperation between the primary and secondary systems for the auxiliary decision-making and improves the protection capability.

The invention discloses a short-circuit current calculation method for an electric-electric hybrid ship direct-current integrated power system, which comprises the following steps of: respectively carrying out interelectrode short-circuit current analysis calculation on synchronous rectification generators to obtain generator short-circuit current; filter capacitor discharge current analytic calculation is carried out on the DC / DC converters respectively, and transient discharge current is obtained; analyzing and calculating the steady-state short-circuit current output by the lithium battery through the DC / DC converter to obtain the steady-state short-circuit current; and adding the results to obtain the short-circuit current of the system. Compared with electromagnetic transient simulation calculation, the calculation speed is higher, and the calculation result error meets the allowable deviation range of engineering calculation. The method can provide support for protection design and short-circuit safety check of an electricity-electricity hybrid ship direct-current integrated power system powered by a synchronous rectification generator set and lithium battery energy storage in parallel, and can be applied to ship integrated power system application scenes such as harbors as tugs and offshore large transport ships.

The invention relates to the technical field of power system protection, in particular to a power distribution network multi-stage protection constant value self-adaptive cooperative calculation method and a power distribution network multi-stage protection constant value self-adaptive cooperative calculation system. Comprising the following steps: analyzing SVG and XML files to construct a network topological graph, and calculating short-circuit current of each switch node; clustering the switch nodes by adopting a K-means clustering algorithm, and adaptively determining a clustering number according to a short-circuit current range; extracting a representative path and carrying out duplicate removal processing; main switches are identified according to a clustering result, protection constant values are calculated, and constant values are distributed to non-main switches through linear interpolation; and outputting a complete protection setting value table. According to the method, full-process automation of protection setting value calculation is realized, the calculation efficiency and precision are remarkably improved, and the method has strong adaptive capacity and can quickly respond to power grid structure change and operation mode adjustment.

The invention relates to the technical field of electric power system protection, in particular to an accurate fault studying and judging method and system for an electric power system, and the method comprises the steps: receiving a comprehensive intelligent alarm signal, distinguishing a real fault from a false alarm signal, and achieving the accurate recognition of a line fault, a main transformer fault and a bus fault through multi-dimensional feature analysis. And finally carrying out differentiation processing on the line fault, the main transformer fault and the bus fault. According to the intelligent classification research and judgment mechanism based on the fault feature difference, the limitation of a traditional single research and judgment mode is broken through, the research and judgment precision and efficiency are remarkably improved through various fault processing strategies, and a core technical support is provided for constructing a new-generation intelligent power grid fault defense system. The method is high in practicability, and can effectively meet the urgent demand of a modern power system on rapid and accurate fault disposal.

The invention discloses an electric field evaluation method and system based on potential-power transmission line coupling, and relates to the technical field of power system protection, and the method comprises the steps: building a current fluctuation model based on a lightning channel engineering model; hybrid emission of a current element i and a charge element q is adopted based on a current fluctuation model; obtaining a voltage U'under the condition of lossy earth through the induced voltage on each section of line; obtaining a total horizontal voltage based on the voltage under the condition of lossy earth and the voltage under the condition of lossless earth; the electric field is evaluated based on the total horizontal voltage. On the basis of a dipole current model, charge distribution introduction, current generation of magnetic potential and charge generation of potential are combined, the relative positions of charges and current elements can be improved when an electric field channel is discretely simulated by a computer, a near-field electric field can be simulated more accurately, and the simulation precision is improved. Meanwhile, the divergence problem caused by calculation truncation errors can be counteracted when the structure is coupled with a coil type structure, and the accuracy and stability of calculation are improved.

The invention relates to the technical field of power system protection, and discloses a direct-current line bipolar short-circuit fault protection method based on harmonic impedance, which comprises the following steps: measuring a voltage waveform signal and a current waveform signal of a direct-current line protection position in real time; processing the voltage waveform signal and the current waveform signal by adopting short-time Fourier transform, and extracting a high-frequency voltage component and a high-frequency current component of a specific harmonic order; calculating a module value and a phase angle of the high-frequency voltage component and a module value and a phase angle of the high-frequency current component, and obtaining harmonic impedance through voltage division calculation; the fault position is determined according to the harmonic impedance change of each line before and after the fault occurs; the fault position is determined through the harmonic impedance change of each line before and after the fault occurs, and a rapid, reliable and economical protection scheme is provided for the bipolar short-circuit fault of the direct-current line.

The utility model discloses an electric power system protection device, and relates to the technical field of electric power system protection. Comprising a switching power supply, a main control circuit board, a key small lamp display circuit board, a switching value output circuit board, an interface circuit board, a case shell, a current transformer, a voltage transformer, a frequency sensor and an upper computer, and the switching power supply, the main control circuit board, the key small lamp display circuit board, the switching value output circuit board and the interface circuit board are all arranged in the case shell. The current transformer, the voltage transformer, the frequency sensor and the upper computer are connected with the master control circuit board through interfaces of the interface circuit board. According to the device, integration of multiple modules can be realized, the internal installation space of the shell of the protection device is effectively utilized, and the problem that the size of the protection device is too large is avoided.

The utility model relates to the technical field of power system protection and measurement and control, in particular to a transformer differential protection measurement and control device. The device comprises a shell, a control module, a sampling module, a processing module, a power supply module, a heat dissipation module and an environment adaptation module. A plurality of partition plates are arranged in the shell and divide the internal space into a plurality of functional areas. The control module comprises a main control board and a plurality of control circuits, the sampling module comprises a current transformer and a voltage transformer, the processing module comprises a signal processing board and a data processing board, the power supply module comprises a power supply board and a battery, and the heat dissipation module comprises a heat dissipation fan and heat dissipation fins. The environment adaptation module comprises a temperature sensor, a humidity sensor, a heater and a condenser. According to the invention, stable operation of the device in an extreme environment condition can be ensured, the high efficiency and accuracy of signal transmission are improved, and the heat dissipation effect is improved.

The invention relates to the technical field of power system protection and control, in particular to a relay protection verification system, which comprises an intelligent parameter extraction unit for identifying a relay protection setting value sheet based on an OCR (Optical Character Recognition) technology and automatically extracting and structurally storing key parameters of a relay protection device; the verification data generation and conversion unit is used for automatically generating a multi-state quantity verification data sequence covering various scenes on the basis of the key parameters in combination with a preset protection type and action logic model, and exporting verification data into a standard format file adaptive to different models of relay protection calibrators through a built-in format conversion engine; the WeChat applet function management unit integrates basic functions of user identity verification, authority control and operation log recording, and designs a lightweight human-computer interaction interface. According to the invention, the automation and intelligence level of relay protection verification is greatly improved, and the verification accuracy and efficiency are significantly improved.

The invention belongs to the field of power system protection and control, and particularly provides a fault positioning method and device for a cable mixed line and a medium for fault positioning of the cable mixed line. According to the invention, by introducing the wave impedance discontinuity characteristic and the traveling wave speed difference characteristic, the complex structure problem in the hybrid line is specially processed, and the fault positioning precision is significantly improved. The traveling wave attenuation characteristics under different frequencies are analyzed to extract the traveling wave energy of the key frequency component, and the traveling wave energy is fused into the LSTM-CNN network, so that the accuracy of fault positioning is further improved. Shallow layer and deep layer features of the signals are extracted through the CNN layer, the relation between the fault position and the line structure can be reflected more comprehensively, and fault positioning robustness is improved.