143 results about "Power systems protection" patented technology

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 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 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 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 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 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 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.

The application relates to the technical field of power system protection equipment, and discloses a circuit breaker which comprises a base and a cover body, the base comprises a bottom plate and two fixed plates, the bottom plate and the two fixed plates enclose a containing groove, the cover body is provided with first fixed blocks aligned with the fixed plates, and the base is provided with a first isolation structure; the first isolation structure comprises a plurality of first isolation strips arranged at one end of the bottom plate facing the fixed plates, a first insulating baffle arranged at the upper end of the fixed plate, and a first isolation block arranged at the upper end of the cover body, the upper end of the first isolation strip is provided with a first insulating baffle, a multi-pole main loop structure is arranged in the containing groove, and the multi-pole main loop structure is located between the first isolation strip and the adjacent first isolation strip / fixed plate; the multi-pole main loop structure comprises a shell, a first conductive terminal is arranged in the shell, the first conductive terminal extends upwards out of the shell and is located between the first isolation strip and the adjacent first isolation strip / fixed plate. The application has the advantages of reducing the failure probability of flashover and short circuit.

The invention belongs to the technical field of optical fiber communication of power system protection devices, and provides an optical fiber channel monitoring device, an optical fiber channel monitoring system and an optical fiber channel monitoring method. The monitoring device provided by the invention belongs to a welding device with a built-in optical fiber channel on-line monitoring function, a protection optical fiber welding function module and an optical fiber channel on-line monitoring function module are integrated, no additional discrete components are added, the optical fiber breakpoint risk is reduced, and the monitoring device has the characteristics of light weight and integration. In addition, the device can carry out power compensation on optical signals, and the problem of weak long-distance transmission optical signals is solved.

The utility model adopts an interval operation module, which comprises a shell, an integrated circuit board, a circuit breaker position indication unit, an electric power system protection device with a plug-in structure, a circuit breaker tripping and closing operation button, a universal change-over switch and a plug-in unit plugged with the outside, the integrated circuit board comprises a protection device plugging area, an operation button plugging area, a change-over switch plugging area, a module external connection and internal connection area and an indication area corresponding to a circuit breaker position indication unit, so that a functional element part can be plugged into the corresponding area on the integrated circuit board and is welded. The position indication of the circuit breaker on the integrated circuit board is fed back to the interval operation module through the indication area, the convenience of the installation design of each functional element of the interval operation module is ensured, and meanwhile, the similar existing wiring error or the infirm screwing of a lead wire is avoided; and the reliability of the interval operation module is influenced.

The present application relates to the technical field of power system protection, and particularly relates to a static var generator grounding fault protection method, a system and a medium, comprising determining a grounding fault load distribution imbalance area of the static var generator according to a zero sequence grounding current characteristic quantity; in the grounding fault load distribution imbalance area, the electrical coupling stability of the fault area is evaluated according to electrical coupling correlation data between different component parts inside the static var generator, the current electrical stability state and a key influence component list are obtained, the load distribution of the grounding fault load distribution imbalance area is adjusted, and a load distribution optimization scheme is obtained; the optimal protection action timing is determined; the protection action instruction set is generated based on the optimal protection action timing and the load distribution optimization scheme, and the static var generator is controlled to perform grounding fault protection. The present application realizes fast, accurate and orderly protection action of the static var generator in the grounding fault through dynamic adjustment of the load distribution.

The invention belongs to the field of power system protection and control, and particularly relates to a grid-connected and off-grid intelligent switching system of a residual current protection circuit breaker, which comprises a digital twinning construction, safety state evaluation and strategy optimization module, a digital twinning construction module, a safety state evaluation module and a strategy optimization module, constructing a power grid digital twinborn body; on the basis of sliding window detection, wavelet packet transformation and a discrimination model, abnormal current is identified, and a safety state time sequence is generated; and a candidate switching path is generated through a Dijkstra algorithm, the switching opportunity and path are optimized in combination with a particle swarm optimization algorithm, a circuit breaker is driven to execute switching, and data are recorded. According to the invention, grid-connected and off-grid adaptive switching is realized, the power supply safety and continuity are improved, the impact current and interruption time are reduced, and the method is suitable for a distributed energy micro-grid scene.

The application relates to the technical field of power system protection, and specifically discloses a single-phase grounding fault line selection method for a distribution network based on deep learning, which comprises the following steps: firstly, according to the influence of the fault condition on the transient zero-mode current at the outlet of a medium-voltage feeder, a field fault test or a simulation scheme is designed; secondly, the transient zero-mode current data are recorded through tests or simulation of multiple medium-voltage feeders; thirdly, a three-dimensional time sequence matrix is obtained through preprocessing, and a training set and a test set are divided and normalized; fourthly, a global-single-channel hybrid model is constructed based on 1DCNN, time sequence features among multiple channels and in a single channel are extracted, and the time sequence features are fused through a fully-connected neural network; and finally, the model is trained in combination with a data enhancement strategy, and the test set is verified to realize fault line selection. The single-phase grounding fault line selection method for the distribution network based on deep learning can significantly improve the line selection accuracy and reliability, the actual test or simulation scheme is used to guarantee the data quality, the model can accurately extract features, the fault can be quickly isolated, and the safe operation of the distribution network is guaranteed.

The utility model discloses an electric power system protection device optical fiber test automatic plugging tool comprising a clamping assembly and locking mechanisms, the clamping assembly is provided with a plurality of clamping holes, and the clamping holes are respectively used for accommodating the plurality of locking mechanisms; and the locking mechanism is provided with a locking hole for the optical fiber cable to pass through. According to the utility model, the integrated plugging of the optical fiber cable in an automatic test state is realized, and the board card test efficiency is improved.

This invention discloses a cloud-based relay protection system based on a 5G wireless network, belonging to the field of power system protection technology. It includes: a distributed process layer terminal equipment group, used to acquire analog quantities, switching quantities, and operating status information of primary equipment, and to perform tripping or closing operations on circuit breakers or disconnectors according to tripping and closing commands; a cloud computing platform, used to generate calculation results based on the analog quantities, switching quantities, and operating status information of the primary equipment; a regional decision server, used to make a comprehensive judgment based on the calculation results, combined with the current status, voltage status, and power factor of the protected object, and to generate tripping and closing commands; and a 5G private network communication module, used to upload the analog quantities, switching quantities, and operating status information of the primary equipment to the cloud computing platform, transmit the calculation results to the regional decision server, and issue tripping and closing commands to the distributed process layer terminal equipment group. This system can achieve global collaborative protection and reduce the construction and operation and maintenance costs of substations.

The invention discloses an automatic fault test case generation method and system based on Newton iterative computation, and relates to the technical field of power system protection, and the method comprises the steps: analyzing a model file of a relay protection device, and extracting a protection logic, a constant value list and a device model; constructing a nonlinear fault model based on the protection logic, the setting value list and the device model; based on a preset protection constant value and a typical fault scene, setting an initial value of a three-phase fault quantity, the initial value being located in a convergence domain; carrying out iterative solution on the nonlinear equation set by adopting a Newton-Rafson algorithm, and outputting a verified three-phase fault quantity; and writing the verified three-phase fault quantity into a standard test case template to obtain a fault test case. According to the scheme, accurate verification of the protection logic of the relay protection device can be realized, the fault test efficiency and accuracy of the relay protection device can be improved, the labor cost is reduced, and the power failure time is shortened.

The invention relates to a power line carrier high-frequency channel test system, which belongs to the technical field of power system test, and comprises a delay characteristic detection module, a signal stability evaluation module, a self-adaptive time interval calculation module, a frequency stepping control module and a weight coefficient adjustment module, the possibility of wrong sampling in the signal transition stage is avoided, the measurement accuracy is improved compared with a traditional method, the high reliability of a test result is guaranteed, dynamic optimization of the test efficiency is achieved through cooperative work of the two core modules, and on the premise that the accuracy is guaranteed, the test efficiency is greatly improved without manual intervention. According to the method, the optimal test efficiency is continuously sought, the extremely high intelligent level is shown, and due to the traceability of the parameters, debugging, maintenance and optimization of the system are facilitated, and a crucial confidence guarantee is provided in the application fields of power system protection and the like with extremely high reliability requirements.

The invention discloses an implementation method for circuit breaker state monitoring fused with functions of a protection device, and relates to the field of power system protection, circuit breaker state monitoring is realized by the protection device, and the protection device comprises a circuit breaker control loop, a control loop current signal acquisition loop and a control loop voltage signal acquisition loop. The circuit breaker control loop is provided with current and voltage input and output ends, a control loop current signal acquisition loop is connected in series in the current input and output ends for switching on and tripping, and a control loop voltage signal acquisition loop is connected in parallel in the voltage input and output ends, so that hardware multiplexing is realized; according to the state monitoring method, breaker tripping and closing voltage and current signals and system signals are collected in a single sampling window at the same time, a performance evolution curve is constructed after digital fusion processing, protection logic verification and closed loop feedback are carried out based on the performance evolution curve, and state monitoring and early warning are achieved in combination with recording data analysis. And the operation safety and reliability of the power system are improved.