20 results about "Direct lightning strike" patented technology

The invention relates to the technical field of power systems, and provides a power transmission line lightning stroke fault positioning method and device, electronic equipment and a storage medium. The method comprises the following steps: acquiring transient voltage data after a power transmission line is directly struck by lightning; defining a set of possible fault locations based on the historical fault data; converting the transient voltage into a transient current; reversely injecting the transient current into a simulation model of the power transmission system from the same observation point, and simulating a transverse branch current at each possible fault position; and calculating the time domain similarity between the transient current and the transverse branch current at each possible fault position, and determining the fault position with the highest similarity as a lightning stroke fault position. According to the invention, high-precision positioning of the lightning stroke fault can be realized only by installing one measurement point in the main substation, and the reliability is high. The method is not only suitable for a lossless system, but also suitable for a lossy transmission line.

The invention provides a vehicle-mounted mobile lightning test system which comprises a vehicle-mounted chassis, a hydraulic lifting and overturning platform and an impulse voltage generator, the hydraulic lifting and overturning platform is arranged on the vehicle-mounted chassis, and the impulse voltage generator is arranged on the hydraulic lifting and overturning platform. And the impulse voltage generator can overturn under the action of the hydraulic lifting and overturning platform. According to the vehicle-mounted mobile thunder and lightning test system provided by the invention, through the design of the hydraulic lifting and overturning platform, the impulse voltage generator can be adjusted to be in a horizontal posture during transportation, so that the transportation height and the gravity center are reduced, and the road transportation requirements are met; in a test site, the impulse voltage generator can be overturned to a vertical posture, the height and space requirements required by the test are met, and the requirements of direct lightning stroke effect test and airworthiness conformity verification of large tested objects such as low-altitude aircrafts and wind power blades in a non-fixed laboratory environment can be met.

Power line conductors are normally shielded from direct lightning strikes by appropriately placed overhead ground wires. However, even when such overhead ground wires work as intended and intercept a strike, for a short period of time, typically a few microseconds, the shield wire is exposed to an impulse type potential rise. This could be sufficient to cause flashover of one or more line insulator strings. This is called backflash. The present invention solves this problem by providing a power transmission tower structure with an embedded ground conductor positioned in order to optimize the coupling factors to all conductors and reduce stress on all insulator strings through increased electromagnetic coupling. Use of a streamer-inhibited conductor avoids adverse effects such as radio interference and audible noise due to induced charges and improves electromagnetic coupling as a result of the reduced surge impedance of the conductor.

The invention discloses an aircraft gravity filler cap with electric lap joint and lightning protection functions, and belongs to the technical field of aircraft gravity refueling. The aircraft gravity filler cap with the electric lap joint and lightning protection functions comprises a filler cap seat, an upper cover assembly and a lower cover; the upper cover assembly is provided with a conductive piece making contact with the covering cap base. The lower cover is made of a high dielectric strength material; the metal base and the covering cap seat are in electric lap joint through the conductive part, when the whole aircraft gravity filler cap is struck by lightning, the conductive part conducts electric charges to the covering cap seat and the outer wall of an oil tank, and therefore the sealing face of the covering cap seat is prevented from being ablated by high-voltage electric arcs when the aircraft gravity filler cap is struck by lightning, and personnel and equipment are prevented from being damaged by residual electric charges. The lower cover is located in the oil tank and is made of high dielectric strength materials, electric fire is prevented from occurring in the oil tank of the gravity oil filler cover under the direct thunder and lightning action, and the problems that a traditional gravity oil filler cover does not have good electric lap joint performance, and a sealing face of a cover seat is ablated by high-voltage arcs when the traditional gravity oil filler cover is subjected to the thunder and lightning are solved.

The utility model discloses a lightning protection satellite phased array antenna, which comprises an antenna body, the antenna is provided with a first protection device, the first protection device is used for guiding direct lightning stroke current, the antenna body comprises a second protection device which is integrally arranged, and the second protection device is used for guiding the direct lightning stroke current. The second protection device is used for protecting electromagnetic pulses generated by lightning stroke induction, and can be used for direct lightning stroke protection and lightning stroke induction protection, and the lightning stroke induction protection also adopts complete machine-level and board-level protection, so that the protection effect is enhanced to a greater extent, and the lightning stroke induction protection effect is improved. The two-stage protection reduces the influence of the induction lightning stroke on the equipment to the greatest extent.

Provided is a lightning strike monitoring system wherein: the change over time in vibration intensity at measurement points set along an optical fiber which is provided along a power transmission line is acquired per frequency by distributed acoustic sensing (DAS); the location of occurrence and time of occurrence of a lightning strike are acquired from a lightning strike location system (LLS); a span having a measurement point that includes a mode of change over time in vibration intensity which is due to a lightning strike among changes over time in vibration intensity per frequency in a prescribed period before and / or after the time of occurrence is extracted as a lightning strike detection span; of the lightning strike detection span, a span that exists within a prescribed distance from the location of occurrence is specified as a nearby span; and when the changes over time in vibration intensity per frequency in a prescribed period before and / or after the time of occurrence at a measurement point of the nearby span include a mode of change over time in vibration intensity which is due to a direct lightning strike in the nearby span, information indicating that there has been a direct lightning strike in the nearby span is generated.

The utility model provides a simple 10kV strain rod overhead lightning conductor device structure, which comprises a strain rod body, the upper end of the strain rod body is sleeved with a hoop, the left end and the right end of the hoop are fixedly connected with a UT wire clamp through first bolts, the UT wire clamp is connected with a lightning conductor, and the lightning conductor is provided with a parallel groove clamp. According to the utility model, flashover caused by direct lightning strike on the lead can be converted into counterattack flashover after lightning strike on the lightning conductor by arranging the lightning conductor, and the electric pole and the lightning conductor simultaneously shunt discharge of lightning current, thereby being beneficial to reducing energy flowing through a metal oxide lightning device of a line.

The present application relates to the field of power grid protection system protection technology, and in particular to a method for evaluating and warning the hazard of low-amplitude direct lightning strikes in distribution networks. The method comprises: measuring the maximum value of the grounding resistance, the tower height and the tower spacing of the target tower in the distribution network; calculating the corrected grounding shunt coefficient corresponding to each tower according to the maximum value of the grounding resistance of the target tower, the tower height and the tower spacing; obtaining the lightning current amplitude of the distribution network, and calculating the tower top overvoltage of the target tower according to the corrected grounding shunt coefficient, the maximum value of the tower grounding resistance and the lightning current amplitude; when the tower top overvoltage is greater than or equal to the preset tolerance voltage threshold of the target tower, outputting a warning that the distribution network is subject to severe direct lightning strike hazards; otherwise, no warning is output. It aims to solve the problem of how to accurately calculate the tower top overvoltage of the tower.

The invention discloses a full-scene thunder and lightning intelligent monitoring and analysis system. The system comprises a full-scene thunder and lightning monitoring module, an alarm module and a central processing unit. According to the invention, the lightning early warning monitoring module, the lightning positioning monitoring module, the grounding resistance monitoring module, the lightning peak value monitoring module, the lightning protection monitoring module and the direct lightning monitoring module form a full-scene lightning monitoring module to carry out full-scene monitoring on lightning; the monitoring data is transmitted to the cloud platform through the communication gateway, and the central controller obtains the monitoring data from the cloud platform, analyzes the obtained monitoring data, stores an analysis result and the monitoring data, controls the alarm module to work according to the analysis result, and outputs a corresponding alarm signal to remind a user to take a corresponding lightning protection measure. The thunder and lightning development trend is comprehensively analyzed, the reliability of the alarm signal is improved, and the life and property safety of a user and the equipment safety are further guaranteed.

The utility model relates to the related technical field of lightning protection, in particular to a simulation device for reservoir area direct lightning protection layout, which comprises a simulation reservoir area, the rear side and the right side of the surfaces of the upper end and the lower end of the simulation reservoir area are symmetrically slotted and provided with butt joint pits, and the middle of the front end and the middle of the left end of the simulation reservoir area are provided with butt joint fixing plates. The improved simulation device for the direct lightning protection layout of the reservoir area is provided with a butt-joint pit and a butt-joint protrusion, the butt-joint protrusion is arranged by grooving the surface of the simulation reservoir area, and a pressing disc at the bottom end of the butt-joint protrusion extrudes a sliding connecting rod by pressing the butt-joint protrusion, so that the direct lightning protection layout of the reservoir area is simulated. The sliding connecting rod slides to drive the clamping and fixing assembly to withdraw out of the rectangular groove of the butt-joint protrusion, the butt-joint protrusion is rapidly taken out, the butt-joint protrusion can be clamped into the circular groove of the butt-joint pit, the multiple simulation reservoir areas can be spliced through the structure, and then the area size of the simulation reservoir area meeting the experiment requirement is formed.

The present invention discloses an intelligent multi-layer gap overvoltage protector based on a copper-chromium alloy material. A multi-layer discharge gap composed of multiple electrodes made of the copper-chromium alloy material is installed in an insulating housing. Each electrode is insulated and isolated by an insulating medium. A trigger electrode is designed at the bottom electrode gap of the multi-layer gap. The trigger electrode can automatically sense and couple to receive the energy of a lightning overvoltage, and trigger the bottom electrode gap of the multi-layer gap and other gaps to conduct quickly. Therefore, the three-terminal overvoltage protection gap of this intelligent multi-layer gap structure has remarkable characteristics such as a high DC breakdown voltage, a high voltage protection level, a fast response time, and a strong ability to resist power frequency or DC follow-up current. This intelligent multi-layer gap overvoltage protector can be used for the protection of direct lightning strikes and lightning-induced overvoltages in application scenarios such as the communication field and even the power field.

This utility model provides a lightning protection filter circuit suitable for airborne windshield washer systems, relating to the field of power adapter technology. It includes a lightning protection filter device, within which a lightning protection filter circuit is installed. The lightning protection filter circuit comprises a conventional lightning protection filter circuit, a power supply characteristic protection circuit, and a power supply filter protection circuit. These circuits are connected sequentially. An AC input terminal, a signal output terminal, and a power output terminal are respectively arranged around the lightning protection filter device. By integrating the conventional lightning protection filter circuit, the power supply characteristic protection circuit, and the power supply filter protection circuit into a single space, it not only meets the filtering efficiency against high-frequency external interference but also provides protection against indirect and direct lightning strikes, thus satisfying the electromagnetic compatibility requirements of complex electromagnetic environments in aircraft. It can be widely used in the field of complex electromagnetic environments in aviation.

The utility model discloses a multi-gap lightning protection device which comprises an insulating rod, two ends of the insulating rod are respectively connected with an upper connecting fitting and a lower connecting fitting, an insulating disc is coaxially arranged on the insulating rod, and the multi-gap lightning protection device is characterized in that two sides of the insulating disc are respectively provided with a vertical electrode column, and the two electrode columns are close to the edge of the insulating disc. The central angle between the two is greater than 20 degrees; a plurality of electrode balls are embedded in the insulating disc, the electrode balls are uniformly distributed at intervals along a major arc between the two electrode columns, a gap hole perpendicular to a connecting line between any electrode ball and the adjacent electrode column or between the electrode ball and the adjacent electrode column is formed, and one end of the gap hole penetrates through the surface of the insulating disc; the upper connecting fitting and the lower connecting fitting are respectively provided with an electrode column facing the insulating disc. Every two adjacent electrode columns are arranged in a spaced mode. The lightning arrester has the advantages of being simple in structure, convenient to install, capable of being operated and used in a severe environment, low in maintenance cost, large in through-flow capacity, capable of bearing direct lightning attack and the like.

The invention discloses a wind power plant current collection system lightning stroke fault tracing method based on comprehensive feature analysis, and the method comprises the steps: carrying out the characteristic quantity calculation of voltage / current waveform data under lightning stroke monitored by a high-low voltage side sensor of a box-type transformer in real time, and obtaining a key feature parameter representing a lightning stroke fault; converting into dimensionless evaluation scores through an interval mapping function, and obtaining feature scores under three fault types; and assigning weights to the feature scores under each fault type, calculating total scores of the corresponding fault types, and judging the fault type to which the lightning stroke event belongs according to the total scores. The method can directly distinguish shielding lightning, direct lightning and grounding grid counterattack faults through quantitative criteria, solves the problem of misjudgment caused by fault mixing in a traditional method, helps to improve the accuracy of lightning protection and fault diagnosis, further quickly locates a fault point according to the fault type, reduces the downtime of a wind power plant, and improves the working efficiency of the wind power plant. And a powerful guarantee is provided for safe and stable operation of a power system.

This invention relates to the field of power system technology, and provides a method, device, electronic device, and storage medium for locating lightning strike faults in transmission lines. The method includes: acquiring transient voltage data after a direct lightning strike on a transmission line; defining a set of possible fault locations based on historical fault data; converting the transient voltage into a transient current; injecting the transient current in reverse from the same observation point into a simulation model of the transmission system to simulate the transverse branch current at each possible fault location; calculating the time-domain similarity between the transient current and the transverse branch current at each possible fault location, and determining the fault location with the highest similarity as the lightning strike fault location. This application only requires the installation of a single measurement point at the main substation to achieve high-precision lightning strike fault location with high reliability. It is applicable not only to lossless systems but also to lossy transmission lines.

A thunder and lightning intercepting apparatus. In the present application, a sufficiently long target upward leader can be generated, so as to construct a thunder and lightning discharge channel; and several lightning rods are used to receive overhead lightning strikes and side lightning strikes that are from different directions, so as to intercept the overhead lightning strikes and side lightning strikes, thereby effectively attenuating lightning strike currents and reducing the intensity of a lightning-strike electromagnetic field. Therefore, the present application may be applicable to buildings that need protection against direct lightning strikes and induction lightning strikes, and is particularly applicable for use in systems such as onshore / offshore wind power, high-voltage power transmission, or high-speed rail overhead lines, thus playing a role in effectively intercepting lightning strikes from different directions. Not only is the safety of buildings to be protected improved, but the usage cost is also saved on.

The invention discloses a wind turbine lightning stroke monitoring system control method based on EMTP-RV, mainly relates to the technical field of wind power plant control, and comprises the following steps: S1, modeling overvoltage and electromagnetic transient characteristics on a wind turbine under a lightning stroke condition; s2, the blades and the tower of the wind turbine are modeled, and modeling analysis is carried out based on the recombination version (EMTP-RV) of an electromagnetic transient program; s3, establishing an EMTP-RV comprehensive computer monitoring system capable of protecting a plurality of mutually connected wind turbines from being influenced by lightning strokes; according to the wind turbine lightning stroke monitoring model based on the EMTP-RV, the model constructs a comprehensive computer monitoring system based on the EMPT-RV under the condition that a plurality of wind turbines are connected with one another, direct lightning stroke of blades is considered or soil near a lightning stroke tower is considered, lightning stroke monitoring under the direct lightning stroke condition and indirect lightning stroke condition is achieved, and the wind turbine lightning stroke monitoring accuracy is improved. And the protection of a plurality of wind turbines under the lightning stroke condition is effectively realized.

This invention discloses a method for calculating the direct lightning trip rate of a power collection line affected by a wind turbine, belonging to the field of lightning protection for wind farm power collection lines. The calculation method first obtains relevant parameters of the wind farm power collection line and the geographical location of the wind turbine. Then, it divides the line segment and lightning current amplitude range, comparing the line backflashover withstand level and the backflashover current range with the lightning current amplitude to calculate the line backflashover trip rate and backflashover trip rate. The direct lightning trip rate is corrected based on the overlap area between the wind turbine lightning interception area and the line direct lightning strike area. Finally, the method iteratively calculates different lightning current amplitudes and line segments and accumulates the results to obtain the line direct lightning trip rate. This invention considers the influence of the wind turbine on the line lightning strike probability when calculating the direct lightning trip rate of the power collection line, making the calculation results of the direct lightning trip rate of the wind farm power collection line more accurate.

A drone with a Faraday cage includes a lattice-shaped conductor configured to expose the propellers to the outside and surround the drone body (control unit), a lightning rod disposed on the conductor and configured to avoid a direct lightning stroke on the propellers, an insulating attachment portion configured to attach the conductor to the drone, and a guide line configured to connect the conductor and the control facility on the ground.

The utility model relates to the technical field of lightning protection devices, in particular to a direct lightning protection structure for a photovoltaic energy storage battery, which comprises a lightning protection net used for covering the energy storage battery, the lightning protection net is a halfpace-shaped net cover with an opening in the bottom wall, a first ground net is embedded and connected under the ground of the lightning protection net, and a second ground net is embedded and connected under the ground of the energy storage battery. The height difference S1 between the lightning protection net and the energy storage battery meets the following formula: S1 is greater than or equal to 0.3 Ri + 0.18 H, the distance S2 between the first ground net and the second ground net meets the following formula: S2 is greater than or equal to 0.5 Ri, Ri represents the grounding resistance of the lightning protection net, and H represents the buried depth of the first ground net. According to the utility model, the energy storage body can be protected in all directions, and the direct lightning protection effect is improved.