1660 results about "Lightning strokes" 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 provides high hydrophobic static-electricity conducting anti-icing coating and a method for producing the same, aiming at solving the problem existing in the prior art that the common low surface energy coating can not balance both hydrophilic characteristic and static-electricity conducting function. According to the technical scheme adopted to solve the problem, the high hydrophobic static-electricity conducting anti-icing coating comprises component A and component B, wherein the weight ratio of the component A to the component B is 9-16:1. The component A comprises the following materials by weight percent: 35-60 percent of the fluorocarbon resin, 10-40 percent of conductive powder, 1-8 percent of organic silicon compound, 0.5-3 percent of anti-aging agent, 0.5-5 percent of dispersant, 0.5-3 percent of anti-sedimentation agent and 10-40 percent of organic solvent. The component B is aliphatic and/or aromatic curing agent. After being coated on the surface of an electric wire, the high hydrophobic static-electricity conducting low surface energy anti-icing coating can delay the icing and reduce the adhesion force of the ice and the surface of the electric wire. In addition, with the static-electricity conducting performance, the high hydrophobic static-electricity conducting low surface energy anti-icing coating can protect the electric wire against lightning stroke.

The invention discloses a device for online monitoring lightning current and lightning voltage waveform parameters of an overhead transmission line, relating to the fields of lightning information measurement and lightening prevention design. The monitoring system is directly installed on a sub-wire of a single-phase wire or a split wire of the overhead transmission line, a voltage sensor and a current sensor respectively monitor a lightning current signal and a lightning voltage signal, and the two paths of signals are sent to a GPRS (General Packet Radio Service) network by a GPRS module through a signal acquisition and processing module. When the system runs normally, the induced voltage of a check coil is processed and then directly supplies power to the signal acquisition and processing module and the GPRS module and fully charges a lithium ion storage battery; and when the wire has the lightning current and the system is power failure, the lithium ion storage battery supplies power for converting an instant power failure protective capacitor to prevent data loss. The invention provides original data for lightning positioning of the transmission line and the lightning current and lightning voltage waveform parameters of a back calculation lightning stroke point and has the advantages of simple manufacturing process, small size and convenient installation.

The invention relates to an evaluation method of a lightning disturbance risk of a power transmission line section. Line basic information, line geographic information, line structure characteristic information, and line insulation characteristic information are employed; a lightning parameter statistics analysis program is employed to obtain a lightning parameter of a line corridor within a designated time slot and the obtained lightning parameter are used as an evaluation parameter; a lightning protection simulation calculating program is used to carry out calculation to obtain lightning stroke trip-out rates of all towers; a whole line average lightning stroke trip-out rate value that is obtained by calculation is used as a reference value to carry out comparison, so that lightning disturbance risk levels of all the towers relative to the whole line within a designated time slot are obtained; on the basis of a hierarchical structure model, an improved hierarchical analysis calculation program is used to carry out calculation to obtain weight vectors of all lightning disturbance risk level tower percentages by all sections; with regard to different influence degrees of towers with different lightning disturbance risk levels on a lightning disturbance risk, the improved hierarchical analysis calculation program is continued to be used to carry out calculation so as to obtain weight vectors of the towers with the different lightning disturbance risk levels; and then a computer is used to carry out combination on the weight vectors of all the layers from top to bottom to obtain lightning disturbance risk evaluation results of all the sections.

The invention relates to a mobile radio-frequency enabled device. In order to enable a lightning detection by means of such a device, it comprises an electromagnetic interferences detection component detecting electromagnetic interferences in at least one radio-frequency channel, which at least one radio-frequency channel is usable by the mobile radio-frequency enabled device for a communication link. The device further comprises a processing component adapted to determine whether a lightning stroke can be assumed to have occurred in the vicinity of the mobile radio-frequency enabled device due to an electromagnetic interference detected by said electromagnetic interferences detection component. The invention relates equally to a corresponding system, to a corresponding method and to a corresponding software program product.

The invention provides an electric energy metering automation simulation laboratory which is used for experimenting, researching and producing an electric energy metering meter or evaluating the running capability of a traditional electric energy meter. A mode of simulating a true power utilization environment is adopted, an actual power utilization site environment is reproduced by using the modes of an interference signal source, a lightning stroke surge signal source, three-phase independent impedance simulation, the true access of an electric appliance and the like, the interference noiseof a power utilization network is recorded by a real-time frequency spectrum and waveform recording system, the running conditions of an electric energy metering device and a remote meter reading system under various power utilization environments are also observed, recorded and calculated, the obtained mass data are analyzed, and the relevant performance parameters of the electric energy metering device and a remote electric energy data collection system are summarized so as to obtain concrete quantitative data and provide a data support for constructing a relevant standard.

A lightning detection system provides an estimated location of a lightning stroke. The system includes sensors, and an analyzer. Each sensor provides messages having sensor identification, an amplitude responsive to the lightning stroke, and a time of detecting the lightning stroke. The analyzer applies time corrections and amplitude corrections to improve the accuracy of determining the location of the lightning stroke. Time adjustments and amplitude adjustments for the time and amplitude corrections are recalled from a matrix accessed according to a suggested or estimated location. The matrix may be organized by coordinates of longitude and latitude.

The invention relates to a zinc oxide arrestor on-line monitoring system which comprises a microprocessor which is respectively connected with an A/D converting unit, a lightning stroke counting module and a GPRS communication module; the A/D converting unit is respectively connected with a leakage current sampling module and a voltage sampling module; the structure of the microprocessor comprises input/output interfaces, a counter and a serial communication interface; the input/output interfaces are connected with the A/D converting unit; the counter is connected with the lightning stroke counting module; the microprocessor is connected with the GPRS communication module; the microprocessor adopts a FPGA chip EPIC6Q240C8. The monitoring system dynamically monitors the insulating property of the zinc oxide arrestor under the operating voltage; the test results are accurate and reliable; the testing process is simple; and the test period is short; the zinc oxide arrestor on-line monitoring system is not easy to be affected by artificial and external factors, can provide long term data information of operation and performance deterioration of the zinc oxide arrestor, and has better practical value.

The invention discloses an on-line transmission line lightning shielding failure trip early-warning method. The method comprises the following steps of: performing statistics on historical lightning shielding failure trip information to obtain transmission line lightning shielding failure trip probability distribution by a two-dimensional information diffusion theory and a conditional probability method; selecting radar forecast data, such as echo intensity, echo tops and vertical accumulated liquid water content; establishing a lightning current magnitude prediction model based on a back propagation neural network; and sending real-time early warning and an early warning grade of transmission line lightning shielding failure trip probability according to the predicted lightning current magnitude and the side distance to lightning stroke and by virtue of the transmission line lightning shielding failure trip probability distribution model. According to the real-time forecast data of a meteorological radar, the method provided by the invention can predict the trip probability of a transmission line and send an early warning signal, thereby providing reference for decision-making analysis of grid dispatching operators, making a transmission line dispatching strategy in time, improving power supply reliability, lowering economic loss of a grid, and improving the reliable running ability of the grid.

The invention relates to an ultra-high voltage direct current transmission line lightning stroke interference recognition method based on voltage relevancy and wavelet transformation transient state energy distribution characteristics, and belongs to the technical field of power system relay protection. When voltage of an ultra-high voltage direct current transmission line fluctuates, positive voltage and negative voltage of the initial 5ms are monitored; the relevancy between voltage of each electrode and voltage of each axis is calculated, and the lightning stroke interference is recognized according to the relevancy; the recognition of fault classifications is shifted to if the interference is caused by a fault; an additional component of line modal voltage is calculated, and seven dimension decomposition is performed on the additional component by utilizing a db3 wavelet; and the ratio of high frequency energy to low frequency energy is calculated, fault categories are distinguished, and fault protection is performed. According to the method, the signal acquisition time is short, the sample acquisition scale is small, and the voltage relevancy theory is used for recognizing lightning stroke interference and fault, so that the thought is clear, and the accuracy is high; the transient state energy distribution characteristics obtained through wavelet transformation are used for recognizing lightning stroke fault and short circuit fault, and the effect is obvious; and the method is easy to implement and is not easily influenced by system parameters and transition resistance.

The invention relates to a lightning protection and especially relates to a 10-35kV overhead transmission line constraint space injection gas arc extinguishing lightning protection gap apparatus which is suitable for a 10-35kV overhead transmission line. The apparatus is installed in parallel on two ends of a line insulator string to protect a flash-over voltage between gaps to be less than the voltage of a protected insulator string so that the apparatus is punctured prior to the protected insulator string when the power transmission line is suffered from lightning stroke. During disruptive discharging, a signal acquisition device automatically senses a lightning current signal and triggers a high speed injection gas generation apparatus. A high speed injection air flow is instantly generated so as to carry out great impact on a follow current arc in a constraint space along a vertical direction, and carry out cooling till the arc is quenched. According to the invention, a structure is simple, installation and maintenance are convenient. Through using the apparatus of the invention, when the line is suffered from the lightning stroke, a lightning current can be rapidly led to the ground and simultaneously a high speed airflow quenching power frequency follow current is generated so that electric equipment can be effectively protected and power supply reliability is increased.

The invention relates to a high voltage DC power transmission line shielding failure current waveform inversion recovery method. When the transmission line suffers the lightning stroke, the transient state traveling wave is spread and transmitted by the power transmission line, so the transient response at the protection installation place is different. The transmission line is equivalent to a natural lightning current air-termination system, and when the shielding failure happens, the prior traveling wave fault location technology can precisely locate the lightning stroke point; the parameters of the power transmission line can be obtained by measuring and analyzing on line; and with the transfer function of the transmission line deduced by the method, the lightning current waveform at the lightning stroke point can be finally obtained by carrying out the phase amplitude transformation, noise reduction, and Prony fit process, and deconvolution operation of on the transient voltage which is obtained through a high-speed collection at the protection installation place of the transmission line.

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.

A mobile radio-frequency enabled device that provides a reliable and inexpensive lightning alerting of a user. The device comprises an electromagnetic interferences detection component detecting electromagnetic interferences in radio-frequency signals received by the mobile radio-frequency enabled device for a communication link. The device further comprises a processing component to determine whether a lightning stroke can be assumed to have occurred in the vicinity of the device due to an electromagnetic interference detected by the electromagnetic interferences detection component, and to cause a notification of a user about an assumed lightning stroke via a user interface. The invention relates equally to a system which comprises such a device and a network element of a communication network, to a corresponding method and to a corresponding software program product.

The invention discloses a lightning stroke characteristic assessment method which includes the following steps of: (1) determining a lightning stroke model; (2) determining a tower model and impulse grounding resistance; (3) determining an insulator model and flashover criteria of the insulator model; (4) selecting a line model and a matched load; (5) changing the neutral point grounding modes; (6) measuring zero sequence current values and neutral point potentials in different grounding modes. The lightning stroke characteristic assessment method has the advantage of being capable of being used for accurately assessing the effect of difference of the neutral point grounding modes in a 10kV lightning stroke characteristic on the lightning stroke characteristic.

The invention relates to a method for identifying properties of lightning faults of an overhead line on the basis of the interval distribution of lightning current amplitude and belongs to the technical field of a high voltage. After the overhead line has a lightning tripping fault, fault information such as a grounding resistance of a fault tower, characteristic parameters of a tower rod, positioning information of a lightning monitoring system, topographic parameters and the like are collected; according to a circuit lightning protection performance algorithm and a shielding failure electrical geometric model principle, the counterattack lightning withstand level of the circuit suffering from lightning stroke and the amplitude distribution interval of the shielding failure critical lightning current are calculated by integrating a statistics rule of structural parameters of the tower and the line; and finally, the occurrence probabilities corresponding different lightning fault types of the line are obtained by utilizing a line lightning fault property judgment probabilistic algorithm model. According to the invention, the objective and reliable lightning fault type occurrence probabilities are obtained by utilizing the lightning fault property judgment probabilistic algorithm model; a judging result contains a certain fault-tolerant margin; the aims that information amount required by the lightning fault property judgment is small and the fault information is easy to acquire by operation and maintenance personnel of the line are fulfilled; and the judgment method is simple and rapid and has strong practicality.

The invention relates to a universal intelligent lightning protection monitoring module and a method thereof. The monitoring module comprises a single chip, a liquid crystal display module, an MAX485 communication chip, a temperature sensor, a current conditioning circuit, an inductance coil, a power circuit and a relay. Work states of a lightning protection device are monitored by the single chip ATMEGA16L through collecting electric level at an output end of a photoelectric coupler TLP521; through the current conditioning circuit, lightning stroke times and leakage current are acquired; through the DS8b20 temperature sensor, a temperature signal of a valve block is transmitted to an ATMEGA16L interrupt port 1; through a pulse signal output by an oscillator, the temperature is measured; a thermal trip signal, the lightning stroke times and the temperature of the valve block and leakage current data which are acquired by the single chip ATMEGA16L are stored in a 24C16 storage chip and then are displayed through the LCD1602 liquid crystal display module; the data are converted into an MODBUS protocol and then are uploaded through an RS485 interface or an RS232 interface; and information of the lightning prevention device is displayed through a self liquid crystal display screen, so that the in-place observation can be carried out conveniently and then gaps in the prior art are filled.

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 invention relates to an online monitoring system and an online monitoring method of a zinc oxide arrester. The online monitoring system comprises an online monitoring main control unit, an arrester leakage current online monitoring unit and a busbar voltage online monitoring unit group, wherein the arrester leakage current online monitoring unit consists of an arrester current acquisition assembly and a first data processing and analyzing assembly, and the busbar voltage online monitoring unit group consists of a busbar voltage acquisition assembly and a second data processing and analyzing assembly. Real-time monitoring for leakage total current, resistive current, capacitative current, the number of lightning stroke and the moment of lightning stroke of the arrester is realized, the magnification times can be automatically adjusted according to the magnitude of the measured current, high-precision measurement is realized, in combination with the working condition in site, monitored data are analyzed and processed, the arrester is prevented from being influenced by temperature and humidity of the environment, the problems of the arrester that leakage current of an insulator or an insulating rod is increased caused by foul or being affected with damp internally, and the like are solved, and accidents are effectively prevented from occurring.

The invention discloses a multi-terminal flexible DC power line DC line protection method based on voltage pole waves. According to the method, voltage response characteristics of a fault line and a non-fault line at the line boundary during the DC line fault are analyzed, a wavelet transform tool is utilized to extract the transient voltage pole wave characteristic quantity, and internal and external fault identification criteria based on voltage pole wave amplitude characteristics are constructed; for lightning stroke interference, lightning stroke identification criteria for a voltage polewave high and low frequency energy ratio are established; according to the voltage pole wave amplitude relationship of the two-pole line, fault pole identification criteria are constructed. Compared with other protection principles, the method is advantaged in that the motion speed is relatively fast, influence of lightning stroke disturbance is avoided, anti-transition resistance capability is relatively strong, and sensitivity is high.

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 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 relates to a power system short-term risk determination method taking disaster factors into account and belongs to the field of power system reliability and risk analysis. The method comprises the steps: geographically dividing regions where disasters causing power system transmission line failure are distributed (disaster regions for short, e.g. regions of lightning strokes, ice disasters, bird hazards and the like); establishing a corresponding relationship between power transmission devices and the disaster regions according to positions of the power transmission devices of a power system and the geographical distribution of the disaster regions; calculating the conditional failure rate of the power transmission devices located in the disaster regions when the disasters occur through carrying out statistics on historical failure of the power transmission devices of the power system and reasons for the historical failure; determining the power outage risk of the power system in a future short term by using power system risk assessment techniques according to weather forecast information and the conditional failure rate of the power transmission devices. By using the method, potential power outage accidents of the power system under disaster weather are warned, and maintenance plans and operating modes for the power system are arranged reasonably, so that large-scale power outage accidents of the power system are prevented.