35 results about "Direct lightning strike" patented technology

The invention relates to a metalization structure of aircraft panels and process for obtaining such structure, such that it comprise a structure of a panel (1) made in composite material, the mentioned panel (1) comprising a metal mesh or foil (2) in its outer part, said panel (1) further comprising a bore which in turn comprises a shank and an upper countersinking (8), such that the mentioned panel (1) is fixed to another structural aircraft element (3) by means of metal fixing elements (4), characterized in that said structure comprise a metallization layer (7) arranged on the upper countersinking (8), extending in the adjacent area of the metal mesh or foil (2), such that it is ensured that electrical continuity exists between the upper countersinking (8) and the metal mesh or foil (2) during the time that the lightning bolt strikes the structure of the panel (1), further ensuring that most of the current discharged by the lightning bolt is conducted over the surface of the structure of the mentioned panel (1). The invention further relates to a process for making such structure of a panel (1).

The invention discloses a direct lightning strike protecting device of a wind power generator set blade, which comprises a power generator set blade, wherein an aluminum sheet is arranged in the power generator set blade in advance; a multi-discharge tip end is connected to the aluminum sheet, and both ends of the multi-discharge tip end extend out of the edge of the power generator set blade side; both ends of the multi-discharge tip end are in needle tooth shapes; and the aluminum sheet is grounded by a cable. The invention has the characteristics of effectively protecting the wind power generator set blade, preventing earth charge from accumulating on the blade by high-frequency and small-energy tip end discharge and preventing or reducing the direct lightning strike from directly striking the blade.

A metalization structure of aircraft panels and process for obtaining such structure including a panel made in composite material, the panel including a metal mesh or foil in its outer part, said panel further including a bore which in turn comprises a shank and an upper countersinking, such that the mentioned panel is fixed to another structural aircraft element by means of metal fixing elements. The structure includes a metallization layer arranged on the upper countersinking, extending in the adjacent area of the metal mesh or foil, such that it is ensured that electrical continuity exists between the upper countersinking and the metal mesh or foil during the time that the lightning bolt strikes the structure of the panel, further ensuring that most of the current discharged by the lightning bolt is conducted over the surface of the structure of the panel.

The invention discloses a direct lightning strike protection device for a shipborne short-wave communication system, which comprises an outer insulating cylinder, an outer upper electrode, an inner upper electrode, an outer lower electrode and an inner lower electrode. The outer insulating cylinder is provided with a hollow chamber and its top end and The bottom ends are provided with openings, the inner upper electrode and the inner lower electrode are located above and below the outer insulating cylinder chamber respectively, one end of the outer upper electrode is inserted into the inner chamber to connect with the inner upper electrode, and one end of the outer lower electrode is inserted into the inner chamber Connected with the inner lower electrode, the outer upper electrode and the inner upper electrode are provided with interconnected air outlet channels, and the outer lower electrode and inner lower electrode are each provided with interconnected air intake channels. The invention also discloses a protection evaluation method of the direct lightning strike protection device of the ship-borne short-wave communication system. The ship-borne short-wave communication system direct lightning protection device solves the problem that the short-wave communication system may encounter direct lightning strikes because the whip antenna is outside the protection range of the ship's lightning rod.

A direct lightning analyzing method for a high speed railway and adopting traction network three-dimensional exposure arc surface projection area calculation basically includes the following steps: (1) acquiring basic line information of the high speed railway, dividing spans with consistent span length, high level bridge structure height, traction network electric and geological structure characteristic parameters into a class, conducting statistics on lightning activity parameters along the line, and enabling the parameters to correspond to the spans of different classes; (2) building a three-dimensional lightning model of a span of the class i according to the traction network characteristic parameters of the class i, calculating the vertical projection area and the direct lightning striking probability of the traction network three-dimensional exposure arc surface, and combining the lightning parameters of the spans to calculate the comprehensive direct lightning striking probability and the year direct lightning trip-out rate of all the spans of the class i; (3) repeating the step (2) to calculate the comprehensive lightning striking probability and the year direct lightning trip-out rate of traction networks of all classes; (4) calculating the comprehensive direct lightning striking probability and the year direct lightning trip-out rate of the full line. By means of the method, the pertinence and the effectiveness of high speed railway direct lightning protection can be improved.

The invention relates to a roof all-environment applicable fan device and system, which comprises a mounting frame, a plurality of air deflectors, a generator, a noise reduction case, a magnetic suspension electric suction assembly and a heating and deicing assembly, the noise reduction case is mounted in the mounting frame, the generator is fixedly mounted in the noise reduction case, a first flange is mounted on an output shaft of the generator, and a second flange is mounted on the output shaft of the generator. The magnetic suspension electric suction assembly is installed on the installation frame, a bearing seat is installed on the installation frame, a rotating shaft is rotationally arranged in the bearing seat, a second flange is fixed to one end of the rotating shaft, a third flange is fixed to the other end of the rotating shaft, and the air guide plate is installed between the first flange and the second flange and provided with a cyclone adjusting opening. The cyclone adjusting port is provided with a cyclone adjusting blade, the noise reduction case and the mounting frame are provided with a heating and deicing assembly, and the mounting frame is provided with an induction lightning rod, so that the device has the advantages of direct lightning stroke prevention, safety protection, noise pollution prevention and freeze injury prevention, and breaks through the bottleneck that the installation of a fan on a building roof is limited due to potential safety hazards.

The invention relates to the field of lightning monitoring and early warning, in particular to a multi-channel comprehensive lightning monitoring instrument. The multi-channel integrated lightning monitor includes multiple lightning pulse sensors, overvoltage / overcurrent protection circuits, amplitude conversion circuits, real-time numerical sampling modules, processors, data storage, clock circuits, monitoring and control systems, and power supply circuits. The signal output terminal of the lightning pulse sensor is connected in series with an overvoltage / overcurrent protection circuit, an amplitude conversion circuit, a real-time numerical sampling module, and a processor in sequence, and the processor is also respectively connected with a clock circuit, a data memory, and a monitoring and control system. The invention can accurately record the waveform, amplitude, frequency and occurrence time of the surge voltage generated by direct lightning strike induction in multiple areas, and can also monitor the working status of the remote lightning protection device with remote signaling function in real time And real-time monitoring of the voltage value between zero and ground, and detection of grounding resistance. Relevant data information can be displayed in real time through the local monitor, and the data can also be transmitted to the remote computer through the serial port line to realize computer viewing and computer monitoring.

A weather information detection device (15) for detecting information on weather. An elevator control device (11) conducts controlled operation in accordance with weather information detected by the weather information detection device (15). The controlled operation avoids a passenger cage (1) being affected directly by change of weather. For example, the elevator control device (11) detects approach of thunder cloud by a lightning detection device (15a) of the weather detection device (15). When there is a possibility of a lightning strike in the vicinity of the elevator, the passenger cage (1) is evacuated by the elevator control device (11) to an evacuation floor (8) free from influence of a direct lightning strike. Thus passenger safety is secured and damage to the passenger cage can be prevented.

The invention provides a method and a device for fully protecting a small wind farm from a direct lightning stroke. For current situations of high lightning probability and low lightning-preventing capacity of a small wind-power generating device with increasingly wide application, the traditional lightning rod device is used for serving a modern lightning-preventing concept of rejecting lightning outside a machine body; in particular, by a method of combining calculation and mapping and by using a unit square concept, the number of the set lightning rods is calculated; considering an equivalent lightning area generated by a lightning triggering effect of the wind farm, a correction factor is introduced, the heights of the lightning rods are increased, ratios of the distance between the lightning rods to the heights of the lightning rods are correctly adjusted, a lightning rod needle body with a combined structure which is formed through sectional connection of welded steel tubes is arranged, and finally, a three-dimensional multiple direct lightning stroke protection system, which takes a machine set of the wind farm as a protection core, completely shields the equivalent lightning ground of the wind farm, and takes a combined protection range including a 'mother and child seat', a 'double-child seat' and a 'three-star seat' and the like as a safety passage, is formed.

A ground mobile direct strike lightning protection system, including lightning monitoring and early warning system, lightning receiving device, lifting system, grounding system and automatic control system; the lightning monitoring and early warning system monitors the atmospheric electric field environment around special vehicles in real time; the automatic control system is based on The monitoring data of the lightning monitoring and early warning system activates the corresponding level of early warning; according to the situation, it sends a rising or falling signal to the lifting system and the lightning receiving device, and sends a grounding start signal or an end grounding signal to the grounding system; Stand upright to enter the direct lightning lightning receiving mode or fold down to put it away; the lifting system rises or falls according to the received signal; the grounding system quickly and reliably grounds or withdraws special vehicles that are in the process of moving or temporarily parked in the field. The invention can provide effective direct lightning protection for special vehicles in the process of moving or under the condition of temporary parking in the field.

The invention relates to a direct thunder and inductive thunder discrimination method based on an optical integrated electric field sensor, and belongs to the technical field of fault recognition. According to the method, the three-phase independent lightning overvoltage of the two ends of the insulator is separated from the original waveform through the method of filtering, overvoltage extractionand decoupling based on the measurement data of the optical integrated electric field sensor, and the direct thunder and the inductive thunder are discriminated according to the polarity of the three-phase lightning overvoltage. The method is verified by practice and has the advantages of being convenient to install and test and high in fault recognition rate.

The invention discloses a single-phase installation structure of a parallel gap of a 10kV distribution line and a test method thereof. The structure comprises: in a 10kV distribution line, the parallel gap is only installed in one phase of the return line of the same base pole tower, the two parallel gaps of the left and right adjacent base pole towers are installed in the other two phases among the three phases respectively, and every three adjacent base pole towers are provided with a group of three parallel gaps. The method comprises simulating a single-phase installation structure in whichthe parallel gap is installed in a 10kV distribution line in simulation software, and obtaining an inductive lightning strike trip-out rate and a direct lightning strike counterattack trip-out rate of the 10kV distribution line of the single-phase installation structure of the parallel gap under an inductive lightning strike and a direct lightning strike. The single-phase installation structure can further improve the lightning withstand level of the 10kV distribution line, reduces its inductive lightning strike trip-out rate and improves the operational reliability of a distribution networkon the basis of protecting distribution equipment such as insulators.

Embodiments of the present invention disclose a lightning protection system for a photovoltaic power station and a photovoltaic power station. The photovoltaic power station includes a photovoltaic array, the photovoltaic array includes a plurality of photovoltaic components, and the lightning protection system includes: a lightning rod array, and the lightning rod array includes a plurality of lightning rods, a plurality of lightning rods Set on the photovoltaic array, the maximum distance between adjacent lightning rods is the first spacing; the balls are placed on adjacent and equal height lightning rods, the first spacing and the radius of the rolling balls and the penetration of the rolling balls relative to the corresponding lightning rods Depth is related, the radius of the rolling ball is related to the lightning protection level of the photovoltaic power station, and the penetration depth is less than or equal to the length of the corresponding lightning rod. The technical solutions provided by the embodiments of the present invention can solve the problem that only one lightning rod is used for the entire photovoltaic power station, resulting in a small lightning protection range, can effectively reduce the number of lightning rods, reduce the cost of photovoltaic power stations, and increase direct lightning strikes for frameless double-glass photovoltaic modules. protective function.

The invention relates to a method for calculating the direct lightning tripping-out rate of a distribution line up to 35kV. In the method, firstly, the lightning damage condition of the region where the distribution line is arranged, and the line parameters and the tower parameters are obtained, and the probability of the event that the lightning current hits the towers and the probability of the event that the lightning current hits the wires are obtained. Secondly, in view of the special neutral point grounding manner of the distribution line, when the lightning current directly hits wires, and two phase flashover and three phase flashover of insulators occur, and the amplitude of the lightning current is calculated through a brand new formula. the simulation model that the lightning current hits towers and lightning conductors under the condition of a specific tower shape and a specific loop is established by means of electromagnetic transient simulating calculation software, the amplitude of the lightning current which causes two phase flashover and three phase flashover of the insulators is obtained, furthermore, the straight hit tripping-out rate is calculated through a new formula, the back flashover tripping-out rate is calculated through a new formula, and by adding the straight hit tripping-out rate to the back flashover tripping-out rate, the total straight hit tripping-out rate can be obtained. The method for calculating the direct lightning tripping-out rate of the distribution line up to 35kV is suitable for calculating the tripping-out rate of the distribution line under the condition of different tower shapes and loops, and can provide basis to lightning damage assessment and line reconstruction.

The invention discloses a direct lightning strike protecting device of a wind power generator set blade, which comprises a power generator set blade, wherein an aluminum sheet is arranged in the power generator set blade in advance; a multi-discharge tip end is connected to the aluminum sheet, and both ends of the multi-discharge tip end extend out of the edge of the power generator set blade side; both ends of the multi-discharge tip end are in needle tooth shapes; and the aluminum sheet is grounded by a cable. The invention has the characteristics of effectively protecting the wind power generator set blade, preventing earth charge from accumulating on the blade by high-frequency and small-energy tip end discharge and preventing or reducing the direct lightning strike from directly striking the blade.

The disclosure relates to a test method, a test circuit and a design method for the withstand characteristic of a lightning protection insulator. The test method includes acquiring the impact energy absorbed by the entire lightning protection insulator under the first impulse current wave; acquiring the impact energy under the second impulse current wave current and corresponding thermal stress; respectively obtain the power frequency reference voltage and leakage current corresponding to the first and second surge current waves; adjust the surge current applied to the entire lightning protection insulator according to the change rate of the power frequency reference voltage and the comparison result of leakage current ; Perform the above steps in a loop until the power frequency reference voltage change rate is less than or equal to the set rate of change, and the leakage current is less than or equal to the set leakage current. subject to the maximum value. Through the technical proposal of the present disclosure, the response characteristics of the entire lightning protection insulator when it is directly struck by a large current are truly simulated.

A method for assessing the risk of lightning damage of overhead distribution lines based on an electrical geometric model, comprising the following steps: 1) judgment of lightning strike location; 2) calculation of lightning strike overvoltage; 3) calculation of lightning strike tripping rate; 1) Establish a location judgment model, further classify lightning strike fault types and calculate lightning strike overvoltage according to the lightning strike location, step 2) establish a lightning strike overvoltage calculation model, and determine whether lightning strike will cause line flashover, step 3) Establish considerations Calculation method of lightning strike tripping rate under multi-phase flashover precondition, step 4) establishing lightning damage risk level assessment method comprehensively considering direct lightning strike and induced lightning. This method establishes a systematic lightning risk assessment process for overhead distribution lines, which can provide a basic assessment basis for the lightning protection design, operation and maintenance of overhead distribution lines.

The invention provides a method for identifying a direct lightning strike and an inductive lightning strike of a transmission line based on direct measurement of a traveling wave. The method comprises the following steps; sampling and measuring the current of the transmission line by using a Rogowski coil; and accurately and concisely identifying whether a lightning strike is a direct lightning strike or an inductive lightning strike by analyzing whether a lightning traveling wave current is bifurcate at a wave tip, whether the polarities of a three-phase lightning traveling wave current are consistent, or the change trend of the amplitude of the lightning traveling wave current. By the method, the direct measurement of the lightning traveling wave is realized, the attenuation and the distortion of the traveling wave are avoided, the transient waveform of the lightning traveling wave current of the transmission line can be recorded completely and accurately, and the identifying accuracy is improved; and the method has the advantages of simple judgment criterion and easy implementation.

The invention relates to a method for judging the fault type of a lightning current of a transmission line, which relates to the technical field of lightning strike fault identification of a transmission line. The purpose of the invention is to accurately judge the fault type in the operation of the existing power grid. In the present invention, the sensor installed on the top of the tower directly measures the direct lightning strike, and the sensor installed on the three-phase line indirectly measures the lightning current propagating along the line. The key parameters of the system are accumulated, and by analyzing the measurement data, the fault type of the tower is judged.