35 results about "Direct lightning strike" patented technology

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.

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.

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.

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.