258 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 belongs to the technical field of power system protection and control, particularly relates to a short-circuit simulation test method and system for a subway direct-current power supply system, and aims to solve the technical problems of insufficient flexibility, difficulty in adapting to complex actual working conditions and lack of adaptivity in the prior art. The method comprises the following steps: presetting and adjusting various short-circuit fault parameters to generate a short-circuit working condition; determining a transient fluctuation separation result based on the short-circuit working condition; constructing a system topology model by utilizing a graph neural network, generating a long-term protection plan in combination with an optimized double-Q learning strategy, and generating an initial risk assessment result by adopting a neural network based on physical information and Monte Carlo simulation; constructing a hybrid risk assessment model in combination with a Bayesian network and fuzzy logic to obtain a target risk assessment result, and generating an emergency response plan based on the target risk assessment result by using a natural language generation technology and a planning algorithm; according to the invention, the precision and reliability of the short-circuit simulation test of the subway direct-current power supply system are improved.

The invention relates to the technical field of power system protection, in particular to a high-temporal-spatial-resolution power carbon emission factor calculation method and system and a readable storage medium. The method comprises the following steps: extracting entities and relationships from an electricity-carbon document to form an electricity-carbon triple, designing an electricity-carbon table data extraction method based on a regular expression for an electricity-carbon table, and constructing an electricity-carbon knowledge graph according to the obtained entities, relationships and attributes; then regarding a given question and an answer corresponding to the question as a sequence, designing an electric power carbon emission data retrieval method by combining distance measurement query based on a sequence matching idea and a bidirectional attention mechanism, and realizing discovery of a target electric power carbon entity and an electric power carbon attribute from an electric power carbon field knowledge graph; further generating a corresponding calculation graph, and according to the topological sorting of the calculation graph, calling related formulas in an electric carbon formula library to complete calculation, so as to obtain a regional direct carbon emission factor; and finally, according to an electric power calling-in relation in the electricity-carbon knowledge graph, performing correction on the basis of the regional direct carbon emission factor to obtain a regional average carbon emission factor considering electric power calling-in. The invention aims to solve the problem of how to improve the accuracy of power carbon emission factors.

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 utility model relates to the technical field of power system protection, in particular to a thermal relay power automatic testing device, which comprises a working platform, a first conveying mechanism longitudinally fixed on the working platform and used for conveying a thermal relay, and a second conveying mechanism transversely connected on the working platform and used for transferring the thermal relay, the working platform is further provided with a current and voltage testing mechanism, a heating overload testing mechanism and a cooling mechanism, the current and voltage testing mechanism, the heating overload testing mechanism and the cooling mechanism are sequentially arranged on one side of the second conveying mechanism from left to right, and the current and voltage testing mechanism, the heating overload testing mechanism and the cooling mechanism are electrically connected. According to the utility model, the first conveying mechanism, the second conveying mechanism, the current and voltage testing mechanism and the heating overload testing mechanism are arranged, so that automatic testing of power characteristics of the thermal relay is realized, the testing efficiency is improved, personal errors are reduced, and the accuracy and reliability of testing results are ensured.

The invention provides a spare power automatic switching locking judgment method and system, can effectively prevent spare power automatic switching misoperation, and relates to the technical field of power system protection and automation. According to the method, on the basis of traditional current locking logic, artificial intelligence and big data analysis technologies are combined, live detection device locking is introduced, and the three technologies are fused to form a self-adaptive multiple locking criterion, so that the reliability of the spare power automatic switching device under various load conditions is improved. And through a split-phase detection method and non-contact measurement, the current detection precision is further improved, and the risk of misoperation is reduced. The problem of misoperation caused by too small current under the light load condition can be solved, the locking logic reliability of the spare power automatic switching device is greatly improved, and a more reliable guarantee is provided for stable operation of a power system.

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 relates to the technical field of protection circuit breakers, in particular to a multifunctional power system protection and control circuit breaker device which comprises a load monitoring module, a load distribution optimization module, a thermal stability analysis module, a response adjustment module and a performance verification module. According to the invention, comprehensive analysis is carried out by combining multiple items of monitoring data, the accuracy of current and voltage abnormity identification is improved, wrong breaking and excessive response are avoided, the system safety is guaranteed, and the utilization rate and energy efficiency of equipment resources are improved based on real-time power distribution and equipment limit during load distribution optimization. According to temperature rise control, load distribution is dynamically adjusted, equipment damage caused by overheating is prevented, operation stability is enhanced, a real-time response adjusting mechanism ensures flexibility and adaptability of power distribution, energy loss in the operation process is reduced, and meanwhile, the overall operation efficiency of a power system is improved through efficient monitoring.

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 belongs to the field of power system protection, and relates to a power distribution network protection method and device suitable for high-proportion distributed power supply access, and the method comprises the steps: collecting the bus voltage of a power distribution network and the outlet current of a feeder line, and judging whether to start protection or not; after protection is started, carrying out equivalence on a plurality of distributed power supplies on a feeder line, and determining an initial value of short-circuit current calculation according to parameters of the equivalent distributed power supplies; judging whether short-circuit calculation is converged or not, if yes, calculating fault parameters of the equivalent distributed power supply when the tail end of the feeder line is in fault, and if not, calculating the fault parameters of the equivalent distributed power supply when the tail end of the feeder line is in fault by using an improved method; calculating the positive sequence current of a feeder outlet when the tail end of the feeder fails; current protection is set again according to the positive sequence current, whether the positive sequence current of the feeder line outlet under the fault meets the action criterion or not is judged, if yes, the protection device sends out a tripping signal to cut off the fault feeder line, and if not, protection is returned; the method is not affected by factors such as short-circuit transition resistance, fault positions and system operation modes, and has the advantages of being high in speed, good in reliability, high in adaptability and independent of communication.

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 relates to the technical field of power system protection, in particular to an alternating-current transmission line traveling wave protection lightning stroke interference identification method and system and a medium, and the method comprises the steps: collecting three-phase voltage and current components of an alternating-current transmission line when a lightning stroke or a fault occurs; obtaining a fault component according to the three-phase voltage and current component and the normal operation voltage and current component; performing phase-mode transformation on the fault component to obtain a phase-mode decoupling voltage and current component; performing wavelet transformation on the phase-mode decoupling voltage and current components, and determining the arrival time of a fault traveling wave; and current waveform change in a preset time window from the arrival time of the fault traveling wave is monitored, and if the first-mode and second-mode current traveling waves in the preset time window are both reduced until the state is close to the no-current state, lightning stroke interference is judged. Through technologies of phase-mode transformation, wavelet transformation and the like, lightning stroke interference and line faults can be accurately and effectively distinguished, false operation and refusal operation are reduced, and the stability and reliability of a power system are improved.

The invention discloses an overload protection device and method for a ring main unit, and relates to the technical field of power system protection, and the method comprises the steps: a distributed power supply grid-connected topology construction module builds a power supply grid-connected topology of a target ring main unit; the effective electricity data determination module samples and decomposes a signal frequency band through real-time power grid data and screens effective electricity data; the circuit equivalent processing module performs circuit equivalent processing on the grid-connected topology based on the effective electric data to form an equivalent topology; the adaptive setting calculation module performs adaptive calculation according to the equivalent topology and the overload protection module to generate an overload protection strategy; and the overload protection management module performs load cutover and switch management on the ring main unit based on the protection strategy to ensure safe operation of a power grid. The technical problem that overload protection response is not timely and inaccurate due to the fact that overload protection parameters cannot be dynamically adjusted according to the real-time power grid state in the prior art is solved, and the technical effects of monitoring the power grid state in real time and dynamically adjusting the overload protection parameters are achieved.

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 secondary cable insulation mutation detection method, device and system, and belongs to the technical field of power system protection and control. Comprises: firstly, establishing a detection model; establishing an insulation data set {R1, R2,..., RN} based on the detection time sequence data; based on an insulation data set, a detection model is used for secondary cable insulation mutation detection, the detection model firstly performs grouping based on the insulation data set, then generates data sequences sorted according to numerical values, and further calculates characteristic quantities based on the data sequences; according to a comparison result of the characteristic quantity and a judgment threshold, obtaining a conclusion whether insulation sudden change exists or not currently; and when the detection result of the detection model is that insulation sudden change exists at present, insulation sudden change warning is performed. By processing and analyzing the insulation resistance data, the insulation mutation is simply and efficiently identified, and the operation and maintenance efficiency is improved.

The invention relates to the technical field of power system protection, and discloses a condensed state function resistor NGR-based power grid safety and stability protection device and method, and the device comprises a three-phase bus A, a bus B and a bus C. The bus A, the bus B and the bus C are respectively provided with a circuit breaker DL, and the two ends of the fracture of each circuit breaker DL are respectively connected with a first condensed state function resistor NGR in parallel. And the bus A, the bus B and the bus C are connected with a second condensed state functional resistor NGR and a first ampere meter in a star connection hanging manner. According to the power grid safety and stability protection device and method based on the condensed state function resistor NGR, short-circuit current and overvoltage in a power grid are suppressed through various functional characteristics of the condensed state function resistor NGR, electromagnetic resonance and system oscillation in the power grid are reduced, and operation of the power grid is stabilized; the first ampere meter and the second ampere meter are used for detecting each path of current in real time, so that the timely finding and processing capability of power grid faults can be improved.

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 invention provides a wind power low-frequency power transmission line fault judgment method and system, and belongs to the technical field of power system protection. According to the method, sensors are installed at key nodes of a low-frequency power transmission line of a wind power plant, and multi-dimensional data and traveling wave signals are collected in real time. The collected data is preprocessed, and multi-dimensional fault features and traveling wave features are extracted. The features are fused to form a comprehensive feature vector, then historical fault data and the comprehensive feature vector are utilized, a support vector machine is used for training a fault classification model, and a fault positioning model is trained based on a regression model of traveling wave features. The models are optimized through an improved sparrow algorithm and a particle swarm algorithm, so that the accuracy of fault judgment and positioning is improved. And finally, the optimized model is utilized to analyze comprehensive feature vectors and traveling wave features which are acquired in real time, so that rapid judgment of fault types and accurate positioning of fault positions are realized. Line faults can be accurately judged, and the stability of a power system 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.