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39results about How to "Reduce trip rate" patented technology
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System and method for power grid thunderstorm disaster early warning based on recognition and forecast
ActiveCN103337133ARealize automatic monitoringRealize scientific disaster preventionWeather condition predictionAlarmsThunderstormPower grid
The invention relates to a system for power grid thunderstorm disaster warning based on recognition and forecast. The system is characterized by comprising a thunderstorm forecast information module, an early warning data analyzing module, a power grid thunderstorm risk early warning module and a display module all connected with one another in sequence. The invention further relates to a method which adopts the system to perform power grid thunderstorm disaster early warning. The system and the method utilize region thunderstorm characteristic and regional power grid characteristic, and combine the anti-thunderstorm design parameters and the on-site geographical conditions of power grid equipment including various transformer substations, electric transmission lines, pole and the like, so as to realize real-time automatic monitoring on the thunderstorm disaster, perform actual condition analysis quantitatively at a specific time and location and near-disaster early warning and perform fine instructional functions on production and scheduling of power grid.
Owner:ZHONGSHAN POWER SUPPLY BUREAU OF GUANGDONG POWER GRID
System and method for pre-warning of typhoon risks of overhead transmission lines of grid
InactiveCN103246936AScientific and efficient risk warningWith self-calibration functionForecastingICT adaptationPrivate networkElectric power system
A system for pre-warning of typhoon risks of overhead transmission lines of a grid comprises a typhoon live information presentation module and a typhoon forecasting information module, wherein the typhoon live information presentation module and the typhoon forecasting information module are externally connected with a weather bureau through a data private network provided with firewalls respectively; relevant data coming from the weather bureau are received when a typhoon crosses a 24-hour warning line of a sea; the used data are selected and calculated by the typhoon forecasting information module, and are calculated by a pre-warning data analysis module; and finally, the data are transmitted to a typhoon risk pre-warning module of the grid for comprehensive data processing, and a risk line set and pre-warning grades of the risk line set are output to the presentation module through judgment of the comparison between the wind speed and the designed wind speed. The invention further comprises a method for pre-warning of typhoon risks of overhead transmission lines of the grid by using the system. The system and the method are applicable to an electrical power system universally, in particular, power transmission and distribution networks in coastal areas, so that capacity of the grid for adapting to meteorological disasters which occur frequently day by day is improved; the trip-out rate of lines under a typhoon environment is reduced, and the safe and stable power supply of power transmission and distribution line channels is guaranteed.
Owner:ZHONGSHAN POWER SUPPLY BUREAU OF GUANGDONG POWER GRID
Air blast arc-quenching lightning protection inter space device
ActiveCN101159368AIncrease success rateReduce trip rateSpark gap detailsTransmission lineElectric arc
The invention relates to a lightningproof device, in particular to a puffer arc quenching lightningproof clearance device used in varies voltage grades transmission lines. The puffer arc quenching lightningproof clearance device comprises a conductor connection body, an earthing connection body, a gas generation device, a signal acquisition device, a high-voltage electrode, an earthing electrode, etc. The gas generation device is arranged near an electrode gap formed between the high-voltage electrode and the earthing electrode. The signal acquisition device generates signal after the generation of the arc. The gas generation device is started and therefore generates the airflow capable of blowing out the arc. The invention has the following benefit effects: the device features wide application, light weight, convenient transportation, assembly and disassembly, re-use, lower operation cost as well as environment protection; the device is fast in action, which is able to extinguish the arc quickly and enhance the success rate of recloser; the device is capable of decreasing the trip rate of the transmission line, and protect power facilities, thus being good for the power safety production and improving the power grid reliability.
Owner:王巨丰
Electric transmission line forest fire early-warning method
The invention discloses an electric transmission line forest fire early-warning method. According to the method, the forest fire early-warning levels of current electric transmission lines at the corresponding period are calculated according to historical fire point data monitored by a satellite, rainfall data and industrial and agricultural customs with fire of a target area, and an early-warning list according to the early-warning levels is made. Line operation and maintenance staff can reasonably arrange forest fire preventing resources according to the current early-warning levels provided through the method, forest fire prevention and control efficiency and the resource utilization rate are effectively improved, waste of manpower and materials is reduced, the trip-out rate of the electric transmission line due to forest fires is reduced, and safety and stability of an electric system are improved.
Owner:STATE GRID CORP OF CHINA +2
Adjustable power transmission line windage yaw preventing device
InactiveCN104201632AEasy to replaceEasy to install on siteDevices for damping mechanical oscillationsTowerWindage
The invention discloses an adjustable power transmission line windage yaw preventing device. The adjustable power transmission line windage yaw preventing device is formed into a triangle by a windage yaw preventing insulator [2], a tower [1] and a line insulator [3]; the windage yaw preventing insulator [2] is fixed on the tower without rotating so as to prevent a conductor [4] from driving the line insulator [3] to deflect under the action of wind. The windage yaw preventing insulator is composed of a U-shaped bolt [24], a support fitting [21], a support [22], a connecting rod [23] and a special insulator [25], wherein the support fitting [21] and the support [22] are connected by welding; an assembly is formed in such a manner that the support fitting [21] and the support [22] are fixed on the tower by use of the U-shaped bolt [24], one end of the connecting rod [23] is fixed on the support [22], while the other end of the connecting rod [23] is connected to the special insulator [25], and then the special insulator [25] is connected with the conductor [4].
Owner:STATE GRID CORP OF CHINA +3
Comprehensive prevention and control method for rural power grid distribution line fault
InactiveCN105140898AImprove standardizationEnhancement of high-quality service capabilitiesEmergency protective circuit arrangementsPower gridSystems engineering
The invention relates to a comprehensive prevention and control method for rural power grid distribution line fault. The method comprises the following steps: step 1, analyzing line fault causes, and determining distribution rules of the rural power grid distribution line fault; step 2, managing the shortcomings of the rural power grid distribution lines according to line fault geographical distribution rules; and step 3, upgrading and improving the rural power grid distribution lines according to the line fault geographical distribution rules. The comprehensive prevention and control method, by combining power network planning and related conclusions of power grid development diagnosis, designs a whole set of comprehensive prevention and control method for the distribution line fault of the rural power grid on the basis of analyzing rural power grid distribution line fault causes and investment capacity, for guiding the operation and maintenance of the rural power grid distribution line, effectively preventing distribution line faults and feasibly ensuring reliable operation of the rural power grid distribution line.
Owner:STATE GRID CORP OF CHINA +2
Lightning arrester of power distribution line
ActiveCN105337240AGuaranteed uptimeEffective regulationInstallation of lighting conductorsTerrainEngineering
The invention provides a lightning arrester of a power distribution line. One end of the lightning arresting hopper line is connected with a metal fixed plate. The other end of the lightning arresting hopper line and a lightning arresting line body are fixedly connected with a pull line via a suspension line. Multiple lightening receiving needles are arranged on the metal fixed plate. A tower top is arranged on the top end of a tension resisting rod. The metal fixed plate is fixed on the top end of the tower top via an insulation piece. By adjusting the insulation piece, height of the metal fixed plate can be adjusted, so interval impedance of an air interval formed between the lightning arresting hopper line and the tower top is easily adjusted and angles of lightening receiving needles can be adjusted. According to the invention, interval impedance can be effectively adjusted; proper interval impedance can be chosen according to different demands on actual terrain or climate; the interval impedance can be adjusted quite easily; during installation of the lightning arresting device, the lightning receiving needles can be adjusted according to actual demands; effective performance of a 0.4KV power distribution line lightning arrester is improved; trip-out rate is reduced; and reliable operation of the power distribution line is ensured.
Owner:STATE GRID CORP OF CHINA +1
Tower head capable of preventing windage yaw
The invention discloses a tower head capable of preventing windage yaw. The tower head capable of preventing the windage yaw comprises a tower pole (1), a vertical hanging piece (2) and an inclined strutting piece (3), wherein a hanging point of the vertical hanging piece (2) is positioned at an insulator hanging position of the original tower pole (1); the tower pole (1), the vertical hanging piece (2) and the inclined strutting piece (3) form a triangle; the lengths of the vertical hanging piece (2) and the inclined strutting piece (3) can be adjusted according to different types of the tower pole (1); the vertical hanging piece (2), the inclined strutting piece (3) and the tower pole (1) are independent, and are dismountable. With the adoption of the tower head, the insulator hanging point can be lowered, so that when the insulator deflects, the distance between the conducting wire and the tower cross arm is increased, the anti-wind capability of the line can be improved, and the windage yaw discharge of the line can be reduced.
Owner:STATE GRID CORP OF CHINA +3
Image recognition method for bird species related to bird-related fault of power transmission line
ActiveCN113255661AImprove accuracyGood generalization performanceImage analysisCharacter and pattern recognitionImage databaseNetwork model
The invention discloses an image recognition method for bird species related to a bird-related fault of a power transmission line. The image recognition method comprises the following steps of: firstly, establishing a bird-related fault related bird species image database by collecting bird species information around the power transmission line, and performing background removal preprocessing on a bird species image based on a category activation graph method; then, establishing a learning model by using four deep convolutional neural networks, pre-training the learning model through an ImageNet data set, finely tuning the pre-trained model network structure, re-training the finely-tuned model by using the pre-processed bird species image training set, and classifying and identifying a test set; and finally, according to the classification accuracy of the four network models, establishing a bird-related fault related bird species image recognition model fused with the multi-convolutional network by adopting a linear weighting method, and carrying out classification recognition on bird species images. According to the invention, a correct bird identification method and means can be provided for operation and maintenance personnel of the power transmission line, differential prevention and control of bird-related faults can be realized, and the trip-out rate of the bird-related faults can be reduced.
Owner:NANCHANG UNIV
Method and device for suppressing overvoltage of iron tower head when lightning strike of transmission line
InactiveCN109586226AReduce trip rateReduce the risk of lightning strikesConcentric cablesPower cables with screens/conductive layersGrounding gridTransmission line
The invention relates to the technical field of high voltage lightning protection for power engineering transmission line, especially to a method and device for suppressing overvoltage of an iron tower head when lightning strike of a transmission line. The method comprises the following steps of: setting a coaxial overhead cable according to a magnitude of a wave impedance value of an overhead lightning protection line; designing a low-impedance coaxial cable down conductor; and connecting and installing the coaxial overhead cable, the coaxial cable down conductor and a ground lightning arrester to the iron tower, and connecting the ground lightning arrester to a grounding grid. The occurrence of tripping accidents and counterattacks during lightning strikes can be reduced.
Owner:金华八达集团有限公司 +3
Same-tower four-loop power transmission line configured with differentiation insulators
InactiveCN102545126ADoes not increase overall trip rateImprove the insulation levelSpatial arrangements/dispositions of cablesElectric power systemEngineering
The invention relates to a same-tower four-loop power transmission line configured with differentiation insulators, which belongs to the technical field of lightning protection in a power system power transmission line and comprises a first line, a second line, a third line and a fourth line, a first insulator, a second insulator and a third insulator. The three insulators have different insulation strength. The first insulator is erected on wires on each phase of the first loop to form a weak insulation loop. The second insulator is erected on wires on each phase of the second loop, and the third insulator is erected on wires on each phase of the third loop and the fourth loop to form a strong insulation loop. By means of the differentiation insulation method, simultaneously trip-out rate of double-loop lines and multi-loop lines can be effectively reduced with lower cost, and overall trip-out rate and single-loop trip-out rate of the weak insulation loop cannot be sacrificed.
Owner:ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
Double triangle phase sequence common-tower common-window dual loop transmission line
InactiveCN101425665AReduce distanceHigh natural powerSpatial arrangements/dispositions of cablesElectric power transmissionNegative phase
The invention relates to a double-delta double-circuit transmission line with phase sequence in the same tower window, which belongs to the technical field of high, ultra-high and extra-high voltage overhead line electric power transmission. The A-phase wire, the B-phase wire and the C-phase wire of a first circuit transmission line are arranged at the upper side of a supporting frame in a delta shape, and the A-phase wire, the B-phase wire and the C-phase wire of a second circuit transmission line are arranged at the lower side of the supporting frame in a delta shape. All the phase wires are relatively fixed with the supporting frame through a wire supporting rod. The transverse two-phase wires on the second layer are positioned in the same phase position, and the first layer wires and the third layer wires at both sides of the supporting frame are respectively positioned in the same phase position. The transmission line has higher natural power and narrower power transmission corridor; compared with the double-circuit transmission line with same phase sequence in the same tower window, the transmission line has lower lightning protecting wire induced voltage and lower double-circuit simultaneous tripping rate during the lightning striking process; and compared with the double-circuit transmission line with negative phase sequence in the same tower window, the transmission line has smaller potential supplied current and recovery voltage, and lower radio interference, audible noise and corona loss.
Owner:NORTHWEST CHINA GRID +1
A neutral grounding mode conversion device
PendingCN109245068AImprove power supply reliabilityOvercoming the disadvantage of not being convertibleEmergency protective arrangements for limiting excess voltage/currentOvervoltageTransformer
The invention discloses a neutral point grounding mode conversion device, which is characterized in that a controllable impedance is arranged between the neutral point of a power network and ground, and the impedance value of the controllable impedance is adjusted according to the open triangle voltage of a voltage transformer in the power network and / or the three-phase voltage of the power network with respect to ground, and the symmetry of the three-phase voltage of the power network is not changed; the controllable impedance is adjusted to make the power network be grounded with large current in normal operation state; the small current grounding mode or to large current grounding mode in single-phase grounding fault state can be converted; The neutral grounding mode can be converted between normal and single-phase grounding faults. The invention has the advantages of both large-current grounding and small-current grounding, and overcomes the disadvantages of different grounding modes, so that the overvoltage inside the power network is low, the trip rate is low, and the power supply reliability is high.
Owner:张安斌
Power grid thunderstorm disaster early warning system and method based on identification and forecasting technology
ActiveCN103337133BRealize scientific disaster preventionAchieve disaster reductionWeather condition predictionAlarmsThunderstormPower grid
Owner:ZHONGSHAN POWER SUPPLY BUREAU OF GUANGDONG POWER GRID
Bell jar type disk-type composite insulator
InactiveCN102969093ALow running costReduce power frequency arc building rateSuspension/strain insulatorsSocial benefitsComposite insulators
Owner:冯长富
Easy disassembly bird control device
InactiveCN105211048ASave installation timeImprove installation qualityAnimal repellantsWood splinterTransmission line
The invention discloses an easy disassembly bird control device. During the process of installation of the bird control device, a fixed plate [14] is put into an angle steel of pole and tower; a locking bolt [13] is tightly screwed; a bird proofing splinter [4] is evenly unfolded into a round shape; then a fixation device [2] is tightly screwed; at last, a U-shaped bolt [12] of a mounting base [1] is tightly screwed. Thus, the bird control device is installed. In need of disassembly of the bird control device, first the U-shaped bolt of the fixation device [2] and the U-shaped bolt [12] of the mounting base [1] are unscrewed; then, rotatable needles are rotated together; the bolt [12] of the mounting base [1] is unscrewed. Thus, the bird control device is disassembled. By use of the bird control device, the installation and disassemble of bird proofing splinters on electric transmission pole and tower are facilitated; installation quality of bird proofing splinters are guaranteed; trip rate of electric transmission line caused by bird damage is effectively reduced.
Owner:STATE GRID CORP OF CHINA +2
Wireless passive temperature measurement monitoring method for substation high-voltage switch cabinets
InactiveCN110220601AGuaranteed operational safetyNo maintenance costsThermometer detailsThermometer applicationsData acquisitionPower grid
The invention discloses a wireless passive temperature measurement monitoring method for substation high-voltage switch cabinets. The method comprises the steps of: (1) integrating UHF electronic tagson temperature measurement sensors, mounting the temperature measurement sensors in the high-voltage switch cabinets by watch pocket type structures, and mounting temperature measurement data acquisition devices communicated with the UHF electronic tags in the high-voltage switch cabinets; (2) by the temperature measurement data acquisition devices, acquiring data measured by each temperature measurement sensor, and uploading the data to a station side management display screen for display; and (3) uploading the data to a remote online monitoring terminal by the station side management display screen, and carrying out centralized monitoring on a temperature condition of each substation high-voltage switch cabinet in a region which needs to be monitored. According to the invention, later maintenance cost of batteries and the sensors is avoided; the wireless passive temperature measurement monitoring method is energy-saving and environmental-friendly; a power supply wire and a data transmission cable are completely omitted; maintenance-free temperature measurement of high-voltage switch equipment can be implemented; power grid accidents are reduced; a trip-out rate of a power grid is reduced; and reliable operation of the power grid is greatly improved.
Owner:GUIZHOU POWER GRID CO LTD
Wire galloping amplitude monitoring system based on microwave interference technology
InactiveCN112946617AEnsure safetyGuaranteed safe operationRadio wave reradiation/reflectionIntermediate frequencyEngineering
The invention discloses a wire galloping amplitude monitoring system based on a microwave interference technology, which comprises a phase shifter, a modulator, a transmitting antenna, a receiving antenna, a mixer, a digital processor, a filter and a collector; the transmitting antenna is in signal connection with the Ethernet, the Ethernet is connected with the modulator capable of adjusting signal frequency offset, the modulator is in signal connection with a frequency mixer capable of mixing signals, the frequency mixer is in signal connection with a receiving antenna, the frequency mixer is in signal connection with a filter, the filter is in signal connection with a collector capable of collecting intermediate frequency signals, and the collector is in signal connection with a digital processor. According to the invention, timely early warning of pole and tower state operation evaluation can be achieved, the safety of a power transmission line is ensured, occurrence of power grid accidents is reduced, the trip-out rate of a power grid is reduced, reliable operation of the power grid is greatly improved, the technical problem of operation maintenance of the power grid in China is solved, and economic benefits and social benefits are huge.
Owner:STATE GRID ZHEJIANG ELECTRIC POWER CO LTD QUZHOU POWER SUPPLY CO
Multi-cavity modular self-assembly structure and processing method
PendingCN113410761AImprove stabilityReduce trip rateSparking plugsSpark gap detailsLow voltageMachining process
The invention discloses a multi-cavity modular self-assembly structure and a processing method. The multi-cavity modular self-assembly structure comprises a grounding module, a high-voltage end module and a plurality of middle modules, wherein the plurality of middle modules are located between the grounding module and the high-voltage end module, the plurality of middle modules are detachably connected in a joggle joint mode, and the middle modules, the grounding module and the high-voltage end module are detachably connected in a joggle joint mode. The multi-cavity modular self-assembly structure is in contact with an air gap through the grounding module and is connected with a lower arc guide arm through the high-voltage module. Due to the fact that the free assembly type modular structure is adopted, the number of arc extinguishing chambers can be combined at will, and the structure used for a middle-low voltage level circuit is obtained. Compared with an existing integrated multi-cavity arc extinguishing structure, the multi-cavity modular self-assembly structure is low in error rate in the machining process, it can be guaranteed that the structural strength is still stable, and impact arcs can be rapidly extinguished.
Owner:云南电网有限责任公司德宏供电局 +1
Anti-windage yaw jumper arrester for 500kV power transmission line
PendingCN112614640AMonitor running statusImprove sealingInsulatorsOvervoltage protection resistorsGlass fiberStructural engineering
The invention discloses an anti-windage yaw jumper arrester for a 500kV power transmission line, which comprises an arrester body I, an arrester body II and a discharge gap assembly, the arrester body I and the arrester body II have the same specification, and the ends, close to each other, of the arrester body I and the arrester body II are connected; the arrester body II is connected with the ends, close to each other, of the discharge gap assemblies, a resistor disc column is arranged on the inner side of the arrester body I, an epoxy glass fiber winding pipe is arranged on the outer side of the resistor disc column, and the gap between the resistor disc column and the epoxy glass fiber winding pipe is filled with silicon rubber. A lightning arrester silicon rubber umbrella cover is arranged on the outer side of the epoxy glass fiber winding pipe. The windage yaw prevention jumper wire lightning arrester for the 500kV power transmission line is high in insulation sealing performance and safety, can effectively avoid windage yaw of a drainage jumper wire, integrates the functions of a jumper wire string, a heavy hammer sheet, a V-shaped insulator string and a conventional line lightning arrester, is low in installation and construction difficulty, and is suitable for popularization and application.
Owner:温州锦泰高压电气制造有限公司
Power transmission line fault and abnormal discharge monitoring system and method
ActiveCN112763860ALow efficiencyGuaranteed safe operationTesting dielectric strengthLaser rangingData center
The invention discloses a power transmission line fault and abnormal discharge monitoring system. The system comprises a monitoring terminal which is used for collecting waveforms, dividing the collected waveforms into a power frequency waveform, a discharge current waveform and a fault traveling wave current waveform, forming a machine code, and transmitting the machine code back to a data center in a wireless mode; the data center which is used for receiving the waveform information returned by the monitoring terminal, restoring original waveform data through an analysis means, storing the original waveform data in a corresponding table structure, processing and analyzing the original waveform data, and storing an analysis result; and a front-end display system which is used for reading data contents in the data center table structure and visually displaying the data contents. The technical problems that in the prior art, an infrared imager, a laser range finder and the like are adopted for troubleshooting on site, video visualization monitoring has the defects of small monitoring area, large flow consumption and high cost, and manual inspection is low in instantaneity, large in workload and the like are solved.
Owner:GUIZHOU POWER GRID CO LTD
Rapid installation device and installation method for small-resistance grounding complete equipment
PendingCN111030073AQuickly isolate faultsImprove accuracyEmergency protective arrangements for limiting excess voltage/currentElectrical resistance and conductanceTransformer
The invention relates to the power grid technical improvement engineering field, and provides a rapid installation device for small-resistance grounding complete equipment and an installation method of the rapid installation equipment. The installation device comprises a grounding transformer, an arc suppression coil, a small resistor and a peripheral guardrail located outside the installation device. The rapid installation device is further provided with a change-over switch, the grounding point of the grounding transformer is connected to the arc suppression coil and the small resistor in parallel through the change-over switch, the change-over switch is switched to be connected to the arc suppression coil or the small resistor to be grounded, and the change-over switch is installed on the peripheral guardrail through an installation support. The change-over switch can be quickly mounted on an upgrading and reconstruction site through the prefabricated installation support, so that main to-be-mounted parts in upgrading and reconstruction can be quickly mounted, the mounting time of the equipment can be effectively prolonged, and the power failure time of a power grid is reduced.
Owner:广州智光节能环保有限公司
Anti-collision overhead conductor device, crane system and crane anti-collision overhead conductor method
PendingCN110759239AReduce risk of wire contactReduce line trip rateSafety gearData transmissionReal-time computing
The invention relates to an anti-collision overhead conductor device, a crane system and a crane anti-collision overhead conductor method. The anti-collision overhead conductor device comprises a scanning distance measuring module and a data display module. The scanning distance measuring module comprises a laser radar, a data processing part and a data transmission part connected in sequence; thelaser radar is used for scanning and measuring distribution conditions of objects in a range wound overhead conductors to generate data and transmitting the generated data to the data processing part; the data processing part is used for transmitting the processed data to the data transmission part after arrangement and calculation of the data; the data display module is in communication connection with the data transmission part; and the data transmission part is used for transmitting the collected data to the data display module. The anti-collision overhead conductor device, the crane system and the crane anti-collision overhead conductor method can reduce the conductor touch risk of the crane construction operation in fixed points, reduces the circuit trip-out rate, and improves the circuit operation and maintenance quality.
Owner:GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
Intelligent dynamic distribution network neutral point grounding method and complete set of devices
ActiveCN103208788BReduce trip rateOvercoming the Disadvantages of TrippingEmergency protective arrangements for limiting excess voltage/currentCapacitanceTransformer
The invention discloses an intelligent dynamic power distribution network neutral-point grounding method and a complete device. The complete device comprises a grounding transformer (1), an arc suppression loop switch (2), a resistance loop switch (3), an adjustable reactor (4), a damping resistor (5), a damping resistor short-circuit switch (6), a resistor (7), a neutral-point voltage transformer (8) and a computer testing and control system (9). The intelligent dynamic power distribution network neutral-point grounding method and the complete device is technically characterized in that a power distribution network neutral-point grounding mode is dynamically converted from an arc suppression coil grounding mode into a small-resistance grounding mode. When the device is connected to a power grid or a power grid operation mode changes, the device firstly works in the arc suppression coil grounding mode. The device measures capacitive current, adjusts inductive current and enables IL-IC to be smaller than or equal to I delta, wherein the I delta is a preset residual current control value. When a single-phase grounding fault of the power grid occurs, the device outputs the inductive current to perform compensation and arc suppression to grounding fault current. If the fault is an instantaneous fault, the fault is eliminated through the compensation and the arc suppression. If the fault is a permanent fault and the grounding fault is still not eliminated after certain time T, the arc suppression coil grounding is converted into the resistance grounding mode, and a fault line is judged and disconnected by detecting zero-sequence current of feeder lines.
Owner:李景禄
A transmission line fault and abnormal discharge monitoring system and method
ActiveCN112763860BLow efficiencyGuaranteed safe operationTesting dielectric strengthWireless transmissionMonitoring system
The invention discloses a transmission line fault and abnormal discharge monitoring system, which includes: a monitoring terminal: collecting waveforms, and dividing the collected waveforms into power frequency waveforms, discharge current waveforms and fault traveling wave current waveforms, forming machine codes Return to the data center via wireless; data center: receive the waveform information returned by the monitoring terminal, restore the original waveform data by means of analysis and save it in the corresponding table structure, and process and analyze the original waveform data at the same time, and store the analysis results Preservation; front-end display system: read the data content in the table structure of the data center, and display it visually; solve the problem of using infrared imagers, laser rangefinders, etc. on-site in existing technologies, and there are monitoring areas in video visual monitoring Small size, large traffic consumption, and high cost. Manual inspections have technical problems such as low immediacy and heavy workload.
Owner:GUIZHOU POWER GRID CO LTD
Substation small resistor grounding device and control method thereof
ActiveCN110707670AEliminate transient failuresReduce fault trip rateEmergency protective circuit arrangementsPower substationTransformer
The invention discloses a substation small resistor grounding device and a control method thereof. The device comprises a grounding transformer, a neutral point small resistor, a first split-phase switch, a second split-phase switch, a third split-phase switch, a bridging switch and a grounding resistor. The output end of the grounding transformer is connected with one end of the neutral point small resistor, and the other end of the neutral point small resistor is grounded; the first phase input end of the grounding transformer is connected with one end of the first split-phase switch, the second phase input end is connected with one end of the second split-phase switch, and the third phase input end is connected with one end of the third split-phase switch; the other end of the first split-phase switch, the other end of the second split-phase switch and the other end of the third split-phase switch are respectively connected with one end of the grounding resistor, and the other end of the grounding resistor is grounded; one end of the bridging switch is connected with one end of the neutral point small resistor, and the other end is connected with one end of the grounding resistor. According to the invention, most of instantaneous faults can be eliminated, and the tripping rate of a single-phase earth fault is reduced.
Owner:ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
Distribution line lightning protection device
ActiveCN105337240BGuaranteed uptimeEffective regulationInstallation of lighting conductorsTerrainTower
The invention provides a lightning arrester of a power distribution line. One end of the lightning arresting hopper line is connected with a metal fixed plate. The other end of the lightning arresting hopper line and a lightning arresting line body are fixedly connected with a pull line via a suspension line. Multiple lightening receiving needles are arranged on the metal fixed plate. A tower top is arranged on the top end of a tension resisting rod. The metal fixed plate is fixed on the top end of the tower top via an insulation piece. By adjusting the insulation piece, height of the metal fixed plate can be adjusted, so interval impedance of an air interval formed between the lightning arresting hopper line and the tower top is easily adjusted and angles of lightening receiving needles can be adjusted. According to the invention, interval impedance can be effectively adjusted; proper interval impedance can be chosen according to different demands on actual terrain or climate; the interval impedance can be adjusted quite easily; during installation of the lightning arresting device, the lightning receiving needles can be adjusted according to actual demands; effective performance of a 0.4KV power distribution line lightning arrester is improved; trip-out rate is reduced; and reliable operation of the power distribution line is ensured.
Owner:STATE GRID CORP OF CHINA +1
An image recognition method for bird species related to bird-related faults in transmission lines
ActiveCN113255661BRealize differentiated prevention and controlReduce trip rateImage analysisCharacter and pattern recognitionData setNetwork structure
The invention discloses a method for recognizing images of bird species related to bird-related faults in transmission lines. Firstly, by collecting bird species information around the transmission line, an image database of bird species related to bird-related faults is established, and the bird species images are analyzed by a method based on a category activation map. The background preprocessing is removed; then, four kinds of deep convolutional neural networks are used to establish a learning model, and they are pre-trained through the ImageNet dataset, the network structure of the pre-trained model is fine-tuned, and the pre-processed bird species images are used for training. The fine-tuned model is retrained on the set, and the test set is classified and identified. Finally, according to the classification accuracy of the four network models, a linear weighting method is used to establish a bird species image related to bird wading faults fused with multi-convolution networks. Recognition model to classify and recognize bird images. The invention can provide the transmission line operation and maintenance personnel with methods and means for correct bird recognition, helps to realize the differentiated prevention and control of the bird's fault, and reduces the trip rate of the bird's fault.
Owner:NANCHANG UNIV
Double triangle phase sequence common-tower common-window dual loop transmission line
InactiveCN101425665BReduce distanceHigh natural powerSpatial arrangements/dispositions of cablesElectric power transmissionNegative phase
The invention relates to a double-delta double-circuit transmission line with phase sequence in the same tower window, which belongs to the technical field of high, ultra-high and extra-high voltage overhead line electric power transmission. The A-phase wire, the B-phase wire and the C-phase wire of a first circuit transmission line are arranged at the upper side of a supporting frame in a delta shape, and the A-phase wire, the B-phase wire and the C-phase wire of a second circuit transmission line are arranged at the lower side of the supporting frame in a delta shape. All the phase wires are relatively fixed with the supporting frame through a wire supporting rod. The transverse two-phase wires on the second layer are positioned in the same phase position, and the first layer wires and the third layer wires at both sides of the supporting frame are respectively positioned in the same phase position. The transmission line has higher natural power and narrower power transmission corridor; compared with the double-circuit transmission line with same phase sequence in the same tower window, the transmission line has lower lightning protecting wire induced voltage and lower double-circuit simultaneous tripping rate during the lightning striking process; and compared with the double-circuit transmission line with negative phase sequence in the same tower window, the transmission line has smaller potential supplied current and recovery voltage, and lower radio interference, audible noise and corona loss.
Owner:NORTHWEST CHINA GRID +1
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