1487 results about "Thunder" patented technology

The invention relates to a method for evaluating the lightning protection performance of transmission lines based on the parametric statistics of lightning. The method comprises the following basic steps: firstly, the information of the transmission lines which require the lightning protection performance evaluation is given; secondly, the ground flash density and the probability distribution statistics of the lightning current magnitude within a specified period are performed to the given transmission lines; thirdly, the lightning-stroke trip-out rate in each section of the transmission lines segmented according to a pole tower within the specified period is calculated; fourthly, a reference value is set according to a design value, a specified value or an operation experience value of the lightning-stroke trip-out rate, and the time difference and the space difference of the lightning protection performance of the transmission lines are evaluated according to the lightning-stroke trip-out rate of each section of the transmission lines and a whole line within the specified period, wherein the lightning-stroke trip-out rate is obtained through the calculation in the step three. The method has the advantages that the evaluation to the lightning protection performance of the transmission lines is performed on the basis of the parametric statistics of lightning with time and space differences; the evaluation result of the method to the lightning protection performance of the transmission lines is more reliable, and has more pertinence; and the evaluation to the lightning protection performance of the transmission lines on different times and different spaces is realized.

The invention discloses a comprehensive monitoring and early warning system based on meteorology and a power grid GIS and a method thereof. The system comprises a data layer and an application layer. The data layer consists of a meteorological database, a power grid GIS database, and a production and operation database. The application layer includes a meteorological monitoring module, a meteorological early warning module, a power grid weather module, an information display module, and an auxiliary decision-making module. The meteorological database, the power grid GIS database, and the production and operation database carry out communication mutually; and the meteorological monitoring module, the meteorological early warning module, the power grid weather module, the information display module, and the auxiliary decision-making module carry out communication with the meteorological database, the power grid GIS database, and the production and operation database respectively. According to the invention, meteorological monitoring information like the temperature, wind direction, and wind speed and the like of important power equipment like a transformer substation, a transmission and transformation line, and a tower can be gotten in real time; and visual meteorological real-time data can be provided for the power grid. Meanwhile, prediction and disaster early warning information of the typhoon and thunder and the like can be provided every 12 hours in the next seven days.

The invention relates to a vision-based target tracking system using an unmanned helicopter, which relates to intelligent control technology. The vision-based target tracking system using the unmannedhelicopter comprises the unmanned helicopter, a visual acquisition and processing unit, a central processing unit, a GPS unit and a gyroscope inertial navigation unit, wherein the unmanned helicopteris transformed from a remote-control helicopter Thunder Tiger 90 for a model aircraft competition, and can be switched between an automatic driving mode and a manual driving mode; the visual acquisition and processing unit consists of an ICETEK DM642-B embedded DSP board of realtime company; the central processing unit consists of an H9200F ARM board of Hengyi High-tech company; the GPS unit consists of a superstar receiver and an antenna which are produced by America; and the inertial navigation unit consists of a 3DM-GX1 of MicroStrain company. The vision-based target tracking system usingthe unmanned helicopter realizes the functions of vision navigation control and target tracking of the unmanned helicopter within a local scope.

The invention relates to a lightning striking fault identifying method of a direct current power transmitting line traveling wave protection. According to the characteristic difference of voltage traveling wave shape between the formed faults and unformed faults, two-pole voltage traveling wave weight and origin direct current weight are used to identify changing trend of the wave shape; ratio of a initial traveling wave mode maximum value and the second mode maximum value is used for representing saltation that the wave shape is cut; combining the two characteristics to achieve the identification of the voltage traveling wave while not causing the faults by lightning pole tower, lightning striking lightning line, lightning striking line shift central distance and the voltage traveling wave of non-lightning short circuit fault by the lightning pole tower, lightning striking line shift central distance. The interference and identification of the two lightning weaves are combined to improve the identifying reliability. A large number of emulations represent that this method is reliable and effective. The physical conception of this invention is intuitionistic and clear and has a rapid action function. The invention does not be influenced by the fault type and transition resistance and it is easy to achieve and suitable for apllying to direct current system protecting device.

The invention provides an online detection and calibration method for a Hall current sensor. In power system application, the Hall current sensor is often impacted by grid fault current or thunder strike to cause bias magnet and damage of the Hall current sensor. In the method, a calibration coil, and auxiliary elements which assist calibrating the Hall current sensor and calibrate a current generator and the like are arranged in the Hall current sensor so as to realize the online detection and calibration of the Hall current sensor. The online detection and calibration method for the Hall current sensor has the advantages that: on the one hand, the measurement accuracy of the Hall current sensor can be improved and a bias magnet error problem can be solved; and on the other hand, a fault sensor can be discovered timely.

The invention discloses a nowcasting method and system of a thunder cloud cluster based on the boundary recognition and tracer technique. The method performs the cloud cluster boundary recognition and topology process to establish the relationship between cloud cluster life timing and clan pedigree by using the pattern recognition technique. The method comprises the steps of performing the boundary recognition on the pre-processed radar data; respectively recognizing the life timing of each cloud cluster and the information of moving direction, velocity, area and strong center and the like ofeach cloud cluster through the six judging factors of the quadtree matching analysis factor, the overlap factor, the area factor, the circum-rectangle factor, the outline comprehensive factor and thelocal similarity determination factor; and performing linear extrapolation on the moving direction, velocity, area and the strength of the cloud cluster. The preliminary result indicates that the system and the method of the invention can realize better recognition and extrapolation forecast of the thunder cloud cluster.

The invention discloses a thunder-lightening induced solid-phase arc-extinguishing lightning arrester. The thunder-lightening induced solid-phase arc-extinguishing lightning arrester mainly consists of a lightning arrester shell, an arc-extinguishing rotary table, an electric conduction metal plate, a starting rod, a clamping rod, an induction coil, an arc-extinguishing barrel and a counting pointer; the arc-extinguishing rotary table is arranged inside the lightning arrester shell, and a flat spiral spring for pushing the arc-extinguishing rotary table to rotate is arranged at the central position of the arc-extinguishing rotary table; the electric conduction metal plate is arranged at the upper part of the arc-extinguishing rotary table; the arc-extinguishing rotary table is provided with a plurality of arc-extinguishing gas pills in the peripheral direction; one side of each arc-extinguishing gas pill is provided with a trigger electrode and a groove respectively, one end of each trigger electrode is connected with one of trigger ends of the corresponding arc-extinguishing gas pill through a lead, and the other ends of the trigger electrodes extend out of the edge of the arc-extinguishing rotary table; and the other of the trigger ends of the corresponding arc-extinguishing gas pill is connected with the electric conduction metal plate through a lead. The thunder-lightening induced solid-phase arc-extinguishing lightning arrester is simple in structure, reasonable in design, high in arc-extinguishing ability and stable and reliable to work, and the arc-extinguishing gas pills are changed quickly and conveniently.

The invention discloses an anti-thunder overvoltage protection device. The anti-thunder overvoltage protection device comprises a piezoresistor, a positive temperature coefficient thermistor and a gas discharge tube, wherein the positive temperature coefficient thermistor is connected with the gas discharge tube in parallel and then connected with the piezoresistor in series; the positive temperature coefficient thermistor and the piezoresistor form a thermal coupling relationship. The piezoresistor, the positive temperature coefficient thermistor and the gas discharge tube can be packaged into a whole, or the piezoresistor and the positive temperature coefficient thermistor are packaged into a whole, thus a packaged body is formed, and the gas discharge tube is located outside the packaged body. The anti-thunder overvoltage protection device not only can restrain operation overvoltage and fault power frequency overvoltage, but also can have the protection function of a normal voltage-sensitive element when lightning stroke pulse overvoltage occurs.

The invention relates to the technical field of the conversion of power input into surge power output, in particular to a modularized multiple wave forms impact generator test device, comprising a plurality of wave form modules, a plurality of charge and discharge switches driven by linear motors, a controllable function charging module and an intelligent control module, wherein, a plurality of wave form modules are used for generating a plurality of impact wave forms; the multiple charge and discharge switches driven by linear motors are connected with a plurality of wave form modules in one-to-one correspondence manner; the controllable function charging module is electrically connected with each charge and discharge switch driven by linear motors; the intelligent control module is electrically connected with each charge and discharge switch driven by linear motors; the intelligent control module is simultaneously electrically connected with the controllable function charging module and controls the controllable function charging module to charge the specified wave form modules according to the setting charging function. The invention has high degree of automation and strong flexibility of the design of modularized circuit, thus providing a good test device for thunder surging tests, electromagnetic immunity tests and quality control.

The invention relates to a thunder and lightning locator with sound sensors and a locating method thereof. The thunder and lightning locator comprises four sound sensors, a four-passage data acquisition card and a data processing system, wherein the four sound sensors are distributed on four observing points; when thunder and lightning occur, the sound sensors positioned on the four space observing points respectively record the thunder reaching time of the observing points; four groups of time data are converted from A/D (analog to digital) by the four-passage data acquisition card and then transmitted to the data processing system; the data processing system solves the difference of the thunder reaching time of three space observing points through logical operation and computes the difference of the distances of the three space observing points according to the propagation speed of sound in the air; and a coordinate of a thunder and lightning generation position is determined according to an equation set and a principle that a point can be determined by intersecting three hyperboloids in space. The invention ensures high measurement precision, also simplifies a locating measurement method, reduces the hardware requirements and the equipment cost, realizes the accurate automatic locating of the thunder and lightning and can be widely used in the field of meteorological sounding.

The invention relates to a method for evaluating the lightning protection performance of a high-speed railway traction network. The method comprises the following steps of: dividing an evaluation area into a plurality of space grids by adopting a grid method, and counting a cloud-to-ground lightning density parameter and a lightning current probability density distribution parameter of each space grid within specific time based on massive lightning positioning system data by utilizing a computer by adopting a method for counting high-speed railway passage lightning parameters; establishing a calculation mode of calculating direct-lightning lightning strip-out rate, inductive thunder lightning strip-out rate and total lightning strip-out rate of each zone and the whole line of a high-speed railway within the specific time period by adopting a lightning strip-out rate calculation method; and taking the lightning strip-out rate of each zone as the basis, taking the whole-line lightning strip-out rate as the reference, acquiring thunder damage risk data information of each zone relative to the whole line within the specific time period, and realizing the lightning protection performance evaluation of the spatial and temporal difference of the high-speed railway traction network. According to the method, the calculated lightning strip-out rate is close to real conditions based on the massive perennial lightning positioning system observation data.

A method for confirming thunder-strike point of electric power transmission line includes setting thunder-strike transducer on each electric power transmission line and grounding wire of electric power transmission tower, connecting said transducers to test box through lead wire, setting up special databank relating to thunder-strike information in WEB server and connecting computer of said server to Internet for accurately and timely confirming out thunder-strike point on electric power transmission line when thunder-strike is occurred on certain position of electric power transmission line and grounding wire.

The invention discloses a method and device for realizing thunder and lightning early warning based on thunder and lightning data mining and a storage medium. The method comprises the following steps:S10) analyzing atmospheric electric field intensity and radar echo, and when meeting preset conditions, starting a thunder and lightning warning process; S20) collecting satellite cloud picture dataand thunder and lightning location data, combining the satellite cloud picture data and the thunder and lightning location data and carrying out judgment and correction, and carrying out clustering analysis on the thunder and lightning data to obtain moving speed and direction of thunderstorm clouds; S30) according to the obtained thunderstorm cloud distribution, calculating moving speed and direction of the thunderstorm clouds through a linear regression method, and predicting the location and quantity of thunder and lightning at the next moment; and S40) dividing the area into different grids, and carrying out corresponding levels of thunder and lightning warning according to the predicated location and quantity of thunder and lightning. The thunder and lightning early warning method hasthe advantages of short warning time and high accuracy, reduces overall false alarm rate of a thunder and lightning detection network, improves thunder and lightning warning accuracy and reduces thunder and lightning early warning space accuracy.

This invention discloses a thunder parameter confirm method which includes the following characteristics: it adopts computer to deal with the raw material and data from the station; a database was established based on GIS to divide the area to different grid and conduct statistic on the data from each grid and make every grid have coordinate system geographic attribute same with that of thunder automatic monitoring data and artificial weather station thunder original data; the region of grid relative to the thunder parameter is counted. The advantages are as follows: it can be applied to large area material, large sample and auto-monitored data; the operation is simple and practicable.

The invention relates to a full-lightning positioning system with combination of very-low frequency and very-high frequency (VHF). The full-lightning positioning system is characterized by comprising at least four lightning positioning monitoring stations which are respectively provided with a very-low frequency lightning radiation receiver, a very-high frequency lightning radiation receiver, a GPS receiver and an industrial computer; the station utilizes time reference provided by the GPS receiver and obtains the time and waveform that the change pulse of a lightning electric field and VHF radiation pulse reach all the stations, utilizes the industrial computer to preprocess the obtained waveform data, then transmits the obtained data in real time to the industrial computer for analyzing and processing the pulse waveform by an internet, and realizes real-time monitoring and three-dimensional positioning to lightning discharge events. Under the matching of the above hardware and software, the system can be used for determining the quantity, types, characteristic parameters and statistical characteristics of lightning discharge events occurring in a specified area, and carries out monitoring and early warning to the activities of thunder and lightning.

The invention relates to a method and a system for comprehensively and synchronously observing lightning stroke discharge. The method is based on a global positioning system (GPS) timing technology, and the lightning stroke discharge is observed by the observation system. The method comprises the following steps of: providing the activity trend of lightning storm by using a wide area lightning location system, and reminding the arrival of the lightning storm by using an atmospheric average electric field instrument; and outputting an alternating current (AC) B code signal to a high-speed image pickup device by using a GPS timing device, marking the formation time of each frame of picture by using a clock system, receiving a time to live (TTL) level signal from a lightning high-speed trigger device, outputting correct time t corresponding to a TTL level rising edge to a personal computer (PC), and recording the TTL level signal and electrical and acoustic measurement signals by using a high-speed data storage recorder. The system comprises the wide area lightning location system, a data analysis and processing server, the atmospheric average electric field instrument, the high-speed image pickup device, the lightning high-speed trigger device, a quick electric field change instrument, a slow electric field change instrument, a magnetic field measuring instrument, an array thunder detection device, the high-speed data storage recorder and the GPS timing device.

The present invention relates to a soil body property measuring device used for measuring a current waveform and the pore water pressure of a soil body under the lightning impulse action. The measuring device comprises a model box, a thunder and lightning generating device used for simulating the lightning stroke current shock and a display device, wherein the box body of the model box possesses three segments of cavity bodies in which the soil body samples can be filled, and a water pressure sensor is arranged at the horizontal position of each cavity body. Therefore, the soil body property measuring device can synchronously measure the soil body electrical response of the different soil bodies of different water contents, different salt contents or different acid-base values under the same lightning stroke environment, also can simulate the influence of the lightning stroke on the soil body electrical response very well, thereby providing guarantees for researching the soil body electrical response under the lightning impulse action and carrying out mechanism analysis.

The invention discloses a self-supporting lightning-proof optical cable. The self-supporting lightning-proof optical cable comprises a cable core, a covered layer and a suspension wire, wherein the cable core is used for transmitting an optical signal and power; the covered layer is covered with the cable core; and the suspension wire is connected with the covered layer. The covered layer comprises a shielding layer, an outer sheath and a ground layer, wherein the shielding layer shields the cable core; the outer sheath coats the shielding layer; and the ground layer is arranged between the cable core and the shielding layer. The self-supporting lightning-proof optical cable of the invention can prevent communication equipment from being damaged by thunder and lightening, effectively prevent an electromagnetic field generated by the shielding cable from disturbing other communication cable signals and prevent external electromagnetic field from disturbing the cable core.

The invention relates to a power grid thunder damage risk evaluation method. The information of each circuit needing evaluation is adopted to obtain the lightning stroke trip-out rate and the probability value of lightning stroke reclosing success, reclosing failure but forced sending success, and reclosing failure and forced sending failure of each circuit through computer simulation computation, an automatic power grid thunder damage distribution evaluation system is established by a computer on the basis, and quantization evaluation is carried out on damages of power grid power supply and power transmission equipment in allusion to different circuits after lightning stroke trip-out so as to obtain the thunder damage risk evaluation results of a plurality of circuits in the power grid. The method has the advantages that the thunder damage risk evaluation on each circuit in the power grid is based on a power grid thunder damage risk evaluation model, and the lightning stroke trip-out rate is taken as the basis to consider to comprehensively evaluate a series of damages caused on power grid operation and power transmission equipment after lightning stroke trip-out to obtain the evaluation results of thunder damages of each circuit in the power grid. Because the influence of a plurality of factors is fully considered, the power grid thunder damage risk evaluation result is true and reliable.

The invention discloses an explosion-proof automatic-separation type lightning arrester comprising an insulating cylinder and a silastic jacket, wherein the insulating cylinder is internally provided with a plurality of layers of fixed zinc oxide valve sheets; the lower end of the insulating cylinder is provided with grounding wires conductively connected with the zinc oxide valve sheets; a radiating ventilation groove is arranged around the zinc oxide valve sheets; the lower end of the insulating cylinder is fixed with an explosion-proof separation cover in a sealing way; the inner side of the explosion-proof separation cover in the insulating cylinder is provided with a chemical material part and a hot melt separation part; the end surface of the explosion-proof separation cover is provided with a safety groove communicated with the radiating ventilation groove; and internal flashover generated due to the strong thunder or high-pressure gases generated by violent reaction when the chemical material is heated causes the safety groove to break, thus leading the explosion-proof separation cover to being separated from the insulating cylinder. The explosion-proof automatic-separation type lightning arrester has good separation reliability, the reliable separation not only can be realized under the conditions of aging of the metal oxide arrester and slowly increasing of leakage current, but also can be realized under the condition of internal flashover damage when the lightning arrester is impacted by the strong thunder, and comminuted explosion and permanent ground fault do not occur, thus ensuring the normal operation of electric power systems.

The invention relates to a differentiated lightning protection method for power transmission lines. The differentiated lightning protection method includes: collecting and making statistics on information of a power transmission line; performing lightning protection computation and lightning protection performance risk assessment for every base tower; specifically making lightning protecting measures according to the results of the risk assessment, risk determining factors and characters of lightning protection measures and combining with the line operation situations; and performing safety risk assessment again and economic evaluation for the made lightning protection measures. Differences of the power transmission line in time and space are fully taken into consideration, various factors and characters like thunder and lightning activities and structures of the power transmission line and the topography are comprehensively taken into consideration, lightning protection computation for the power transmission line for every base tower is performed by utilizing thunder and lightning parameters obtained by statistic analysis of data monitored by a thunder and lightning monitoring system, degrees of corresponding lightning protection performance for base towers in one power transmission line are reflected, a power transmission line designing and operating department is effectively assisted to improve the lightning protection performance of the power transmission line by taking the lightning protection measures more meticulously in a targeted manner, and a power grid can be managed in a more elaborate manner.

A 10kV power distribution circuit insulation tower head is disclosed, which is characterized in that: adopting hydrophobic high-strength insulation bar to be assembled with needle-typed insulator by gold tool and form an insulation tower head entity, or adopting hydrophobic high-strength insulation bar to be assembled with gold tool directly and form an insulation tower head. By using the invention, the insulation level of the power distribution circuit can be greatly improved, the thunder discharge air gap can be obviously enlarged, the lightning stroke and line break accidents can be effectively prevented and the climbing distance can be expanded, further, the structure type is easy to improve self-cleaning ability and the occurrence of pollution flashover can be basically and completely precluded, which is beneficial in charged operation, simple in operation process and improves the operation security.

The invention discloses a method for testing airplane model thunder and lightning current distribution by utilizing a thermal infrared imager, comprising the following steps: utilizing a scaling airplane model to replace an airplane to test; placing the airplane model on an insulation bracket; selecting an connected electrode and a discharge electrode and an earthing position according to a thunder and lightning channel when the airplane suffers from lightning stroke; adjusting the rolling angle and infrared thermal imager position of the airplane model; shooting a test piece infrared thermal image before discharge to be used as a standard image; immediately shooting heated infrared thermal image after discharge; dividing the area in which the airplane is located into 40*40 grids; and calculating the temperature variation value of each point; analyzing the relationship of the temperature rise of a conductor and current to obtain two-dimensional current distribution on the surface of the test piece. The method has the characteristics of less equipment, low testing cost, consistence with actual conditions and higher test accuracy; the two-dimensional grids are used to show test results, and can intuitively reflect the current distribution condition. The method can be widely applied to various airplane models and relatively model tests suffered from lightning stroke.