A lightning current detection device, lightning protection equipment and method

Abstract

The application discloses a lightning current detection device and a lightning protection equipment and method, and relates to the technical field of lightning detection. The lightning current detection device comprises a detection assembly and a fixing assembly. The detection assembly comprises a conductive needle core, an induction coil surrounding the conductive needle core and a conditioner connected with the induction coil. The conductive needle core is connected with the first end of a coaxial cable through a first connector and connected with the second end of the coaxial cable through a second connector. The conductive needle core is used for transmitting a data signal on the coaxial cable. The induction coil is used for detecting a real-time current signal on the coaxial cable. The conditioner is used for converting the real-time current signal into a real-time voltage signal proportional to the current amplitude. The fixing assembly comprises an insulator and a shell outside the insulator. The shell is grounded. The insulator is used for fixing the conductive needle core and the induction coil and making the conductive needle core and the induction coil coaxial. The lightning current detection device can actively and stably and continuously detect the lightning current on the coaxial cable.

Description

Technical Field

[0001] This application relates to the field of lightning detection technology, and in particular to a lightning current detection device and lightning protection equipment and method. Background Technology

[0002] As a crucial carrier of signal transmission, coaxial cables are widely used in television broadcasting, satellite communication, cable television, and public safety monitoring. However, the damage caused by lightning is becoming increasingly severe. Current lightning protection equipment focuses only on single protective functions, meaning it cannot detect lightning current on coaxial cables. In such cases, manual post-incident inspection of the equipment is necessary, which is time-consuming and labor-intensive. Summary of the Invention

[0003] In view of the above-mentioned defects or deficiencies in the related technologies, it is desirable to provide a lightning current detection device and lightning protection equipment and method that can actively detect lightning current on coaxial cables and facilitate quick understanding of equipment status.

[0004] In a first aspect, this application provides a lightning current detection device, the lightning current detection device comprising: The detection component includes a conductive needle core, an induction coil surrounding the conductive needle core, and a conditioner connected to the induction coil. The conductive needle core is connected to a first end of a coaxial cable via a first connector and to a second end of the coaxial cable via a second connector. The conductive needle core is used to transmit data signals on the coaxial cable, the induction coil is used to detect real-time current signals on the coaxial cable, and the conditioner is used to convert the real-time current signals into real-time voltage signals proportional to the current amplitude. A fixing assembly includes an insulator and a housing located outside the insulator, the housing being grounded; the insulator is used to fix the conductive needle core and the induction coil, and to make the conductive needle core and the induction coil coaxial.

[0005] Optionally, in some embodiments of this application, both the first connector and the second connector are radio frequency connectors, and the bandwidth of the radio frequency connector is DC to 30 GHz.

[0006] Optionally, in some embodiments of this application, the conductive needle core and the inner cavity of the housing are coaxial, and both the outer circular surface of the conductive needle core and the inner cavity surface of the housing are provided with a smooth coating, the conductivity of which is at least [value missing]. .

[0007] Optionally, in some embodiments of this application, the insulator includes a first circular tube and a second circular tube, wherein the inner wall of the first circular tube is in close contact with the outer circular surface of the conductive needle core, the outer wall of the first circular tube is in close contact with the inner surface of the induction coil, the inner wall of the second circular tube is in close contact with the outer surface of the induction coil, and the outer wall of the second circular tube is in close contact with the inner cavity surface of the housing.

[0008] Optionally, the outer diameter of the conductive needle core described in some embodiments of this application... The inner diameter of the housing The relative permittivity of the material of the insulator satisfy The relative permittivity of the material of the insulator .

[0009] Optionally, in some embodiments of this application, the induction coil is a Rogowski coil, and the outer diameter of the Rogowski coil is not greater than... .

[0010] Optionally, in some embodiments of this application, the conditioner includes an operational amplifier, a first resistor, a capacitor, and a second resistor. The first end of the first resistor is connected to the induction coil, the second end of the first resistor is connected to the inverting input of the operational amplifier and the first end of the capacitor, the second end of the capacitor is connected to the output of the operational amplifier, the first end of the second resistor is connected to the non-inverting input of the operational amplifier, and the second end of the second resistor is grounded.

[0011] Optionally, the output voltage of the operational amplifier described in some embodiments of this application... ,in Represents the mutual inductance coefficient of the coils. This indicates the resistance value of the first resistor. This indicates the capacitance value. This indicates the real-time current signal on the coaxial cable.

[0012] Secondly, this application provides a lightning protection device, which includes a controller and a lightning current detection device as described in any one of the first aspects, wherein the controller is connected to the conditioner of the lightning current detection device.

[0013] Thirdly, this application provides a lightning protection method, which is used in the controller of the lightning protection equipment described in the second aspect, and the lightning protection method includes: Acquire the real-time voltage signal converted by the conditioner in the lightning protection device; Calculate the amplitude change rate corresponding to the real-time voltage signal, and after the lightning strike process ends, accumulate the final number of times the amplitude change rate is greater than or equal to a preset change rate threshold; Based on the preset mapping relationship between the number of times the threshold is exceeded and the remaining service life, the remaining service life of the device corresponding to the final number of times is determined.

[0014] As can be seen from the above technical solutions, the embodiments of this application have the following advantages: This application provides a lightning current detection device and lightning protection equipment and method. A conductive needle core is connected to a coaxial cable, which transmits data signals from the coaxial cable. An induction coil surrounding the conductive needle core detects the real-time current signal on the coaxial cable. The conductive needle core and the induction coil are fixed by an insulator and are coaxial, meaning the detection line and transmission line are independent and do not affect normal data transmission. Furthermore, the non-contact measurement method not only actively and stably detects the lightning current on the coaxial cable, but also converts the real-time current signal into a real-time voltage signal using a conditioner. This allows for quick understanding of the equipment status based on the real-time voltage signal, improving processing efficiency. It also avoids the harm of lightning to the detection components and operators, ensuring safe operation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram illustrating the relationship between the components in a lightning current detection device provided in an embodiment of this application. Figure 2 This is a partial cross-sectional schematic diagram of a lightning current detection device provided in an embodiment of this application; Figure 3 This application provides a schematic diagram of the circuit composition of a conditioner according to an embodiment of the present application. Figure 4 A structural block diagram of a lightning protection device provided in an embodiment of this application; Figure 5 This is a schematic flowchart of a lightning protection method provided in an embodiment of this application.

[0017] Figure label: 10-Lightning current detection device, 101-Detection component, 1011-Conductive needle core, 1012-Induction coil, 1013-Conditioner, 102-Fixing component, 1021-Insulator, 1022-Housing, a-First connector, b-Second connector, 20-Coaxial cable, 30-Lightning protection equipment, 301-Controller. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The following examples illustrate this. Figures 1 to 5 This application provides a detailed description of the lightning current detection device, lightning protection equipment, and method provided in the embodiments of this application.

[0021] Please refer to Figure 1 This is a schematic diagram illustrating the relationship between components in a lightning current detection device provided in this application embodiment, and does not represent the actual shape and size. The lightning current detection device 10 includes a detection component 101 and a fixing component 102. The detection component 101 includes a conductive needle core 1011, an induction coil 1012 surrounding the conductive needle core 1011, and a conditioner 1013 connected to the induction coil 1012. The conductive needle core 1011 is connected to the first end of a coaxial cable 20 via a first connector a and to the second end of the coaxial cable 20 via a second connector b. The conductive needle core 1011 can transmit data signals on the coaxial cable 20. The induction coil 1012 can detect real-time current signals on the coaxial cable 20, and the conditioner 1013 can convert the real-time current signals into real-time voltage signals proportional to the current amplitude. Figure 2 As shown, the fixing assembly 102 includes an insulator 1021 and a housing 1022 located outside the insulator 1021. The housing 1022 is grounded and encloses the insulator 1021, the conductive needle core 1011, and the induction coil 1012. A first connector a and a second connector b are mounted on the housing 1022. The insulator 1021 can fix the conductive needle core 1011 and the induction coil 1012, and make the conductive needle core 1011 and the induction coil 1012 coaxial. The advantage of this arrangement is that the detection line and the transmission line are independent of each other and do not affect the normal data transmission. At the same time, the non-contact measurement method can actively and stably continuously detect the lightning current on the coaxial cable 20, while avoiding the harm of lightning effects to the detection assembly and operators, making it safe and reliable.

[0022] In some embodiments of this application, the induction coil 1012 is a Rogowski coil, and the outer diameter of the Rogowski coil is not greater than... The advantage of this design is that it meets measurement requirements while also miniaturizing the device, saving space, and adapting to various installation conditions, making it highly operable. Furthermore, the Rogowski coil in this embodiment measures based on Faraday's law of electromagnetic induction. It has no magnetic core and therefore no magnetic saturation problem. It can measure both small currents of a few amperes and large currents of hundreds of thousands of amperes, offering a wide measurement range. Moreover, because lightning current wavefronts are extremely steep, exhibiting an instantaneous high-pulse characteristic, the time for the current to rise from 10% peak value to 90% peak value is on the order of microseconds. This means the current rise rate is extremely high, reaching tens of thousands of amperes per microsecond. The Rogowski coil in this embodiment has a bandwidth of up to tens of megahertz, thus enabling precise capture of rapid changes in lightning current.

[0023] Furthermore, such as Figure 3 As shown, the conditioner 1013 may include an operational amplifier, a first resistor, a capacitor, and a second resistor. The first end of the first resistor is connected to the induction coil 1012. The second end of the first resistor is connected to both the inverting input of the operational amplifier and the first end of the capacitor. The second end of the capacitor is connected to the output of the operational amplifier. The first end of the second resistor is connected to the non-inverting input of the operational amplifier, and the second end of the second resistor is grounded. This means that an active integrating circuit is used, sacrificing the ability to measure pure DC current in exchange for stable, accurate, and linear measurement of AC current within the frequency band where lightning current energy is mainly distributed (from a few hertz to tens of megahertz). Due to the output voltage of the Rogowski coil... ,in This represents the mutual inductance coefficient of the coils, i.e., the output voltage of the Rogowski coil. Real-time current signal on coaxial cable The rate of change is directly proportional to the rate of change. Integrating the equations reveals a linear relationship between voltage and current, which is: (1) In equation (1), This represents the output voltage of the operational amplifier. This indicates the resistance value of the first resistor. This represents the capacitance value. Based on equation (1), the gain of conditioner 1013 can be obtained. In other words, the gain can be adjusted by changing the resistance of the first resistor, the capacitance of the capacitor, and selecting a Rogowski coil with a suitable mutual inductance coefficient. This makes it suitable not only for direct lightning effect environments with large current amplitudes but also for indirect lightning effect environments with small current amplitudes, thus having a wide range of applications. In practical use, some embodiments of this application can also... Figure 3Based on the circuit shown, the feedback resistor and capacitor are connected in parallel to prevent the output voltage of the operational amplifier from saturating, and a correction circuit is added after the active integrator circuit to eliminate the output voltage bias error caused by the non-ideal operational amplifier, thereby meeting diverse application requirements.

[0024] In some embodiments of this application, both the first connector a and the second connector b are radio frequency (RF) connectors with a bandwidth of DC to 30GHz. These RF connectors are versatile and integrate RF transmission technology with current detection technology, enabling accurate detection of lightning current parameters without affecting data transmission on the original line, thus ensuring high reliability. In actual installation, the original coaxial cable is first disconnected, and connectors are installed at the two breaks. Alternatively, two cables with attached connectors can be used to replace the original coaxial cable. Then, the lightning current detection device 10 is inserted into the line for use; the operation is simple.

[0025] Furthermore, the conductive needle core 1011 and the inner cavity of the housing 1022 are coaxial, and both the outer circular surface of the conductive needle core 1011 and the inner cavity surface of the housing 1022 are provided with a smooth coating, the conductivity of which is at least [value missing]. The plating materials include, but are not limited to, gold and silver, and the combination Figure 2 As shown, the insulator 1021 includes a first circular tube and a second circular tube. The inner wall of the first circular tube is in close contact with the outer surface of the conductive needle core 1011, and the outer wall of the first circular tube is in close contact with the inner surface of the induction coil 1012. The inner wall of the second circular tube is in close contact with the outer surface of the induction coil 1012, and the outer wall of the second circular tube is in close contact with the inner surface of the housing 1022, as well as the outer diameter of the conductive needle core 1011. The inner diameter of the shell 1022 The relative permittivity of the material of insulator 1021 satisfy The relative permittivity of the material of insulator 1021 This ensures lossless transmission of data and radio frequency signals over coaxial cables.

[0026] The lightning current detection device provided in this application embodiment connects to a coaxial cable via a conductive needle core. This conductive needle core can transmit data signals on the coaxial cable, and an induction coil surrounding the conductive needle core is used to detect the real-time current signal on the coaxial cable. The conductive needle core and the induction coil are fixed by an insulator and are coaxial, meaning that the detection line and the transmission line are independent of each other and do not affect normal data transmission. At the same time, it adopts a non-contact measurement method, which can not only actively and stably continuously detect the lightning current on the coaxial cable, but also convert the real-time current signal into a real-time voltage signal with the help of a conditioner. This allows for quick understanding of the equipment status based on the real-time voltage signal, improving processing efficiency, and also avoids the harm of lightning effects to the detection components and operators, ensuring safe use.

[0027] Based on the foregoing embodiments, this application provides a lightning protection device. Please refer to... Figure 4 This is a structural block diagram of a lightning protection device provided in an embodiment of this application. The lightning protection device 30 includes a controller 301 and... Figures 1 to 3 In the lightning current detection device 10 of the corresponding embodiment, the controller 301 is connected to the conditioner 1013 of the lightning current detection device 10.

[0028] On the other hand, embodiments of this application provide a lightning protection method, which is used for... Figure 4 The controller 301 of the lightning protection device 30 in the corresponding embodiment. Please refer to... Figure 5 This is a flowchart illustrating a lightning protection method provided in an embodiment of this application. The lightning protection method includes the following steps: S101: Obtain the real-time voltage signal converted by the conditioner in the lightning protection equipment.

[0029] S102, calculate the amplitude change rate corresponding to the real-time voltage signal, and the final number of times the cumulative amplitude change rate is greater than or equal to the preset change rate threshold after the lightning strike process ends.

[0030] For example, in the embodiments of this application, the amplitude change rate = (signal amplitude at the current moment - signal amplitude at the previous moment) / time interval, and the preset change rate threshold can be predetermined based on the signal amplitude and waveform change trend when the lightning protection device is subjected to multiple simulated lightning strikes.

[0031] S103, based on the preset mapping relationship between the number of times the threshold is exceeded and the remaining service life, determine the remaining service life of the equipment corresponding to the final number of times.

[0032] For example, in the embodiments of this application, the preset mapping relationship is calibrated through experiments, and it can be in the form of a curve or a table. Since damage caused by lightning strikes is irreversible, the health status of lightning protection equipment can be predicted in advance through long-term statistical analysis, reducing safety hazards caused by undetected equipment deterioration, effectively improving the intelligence level of maintenance management, reducing manual inspection costs, and increasing efficiency. Furthermore, some embodiments of this application can also display the remaining service life of the equipment on its display screen, providing a clear overview. Additionally, if the remaining service life is less than or equal to a preset service life threshold, an alarm can be triggered to ensure safety.

[0033] In another aspect, embodiments of this application provide a computer-readable storage medium for storing program code for executing the aforementioned... Figure 5 Any implementation of the lightning protection method in the corresponding embodiment.

[0034] It should be noted that the descriptions of the same steps and contents as in other embodiments in this embodiment can be found in the descriptions in other embodiments, and will not be repeated here.

[0035] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and modules described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0036] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed between each other can be through some interfaces, indirect coupling or communication connection between devices or modules, and can be electrical, mechanical, or other forms. Modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0037] Furthermore, the functional modules in the various embodiments of this application can be integrated into one processing unit, or each module can exist physically separately, or two or more units can be integrated into one module. The integrated unit can be implemented in hardware or as a software functional unit. If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.

[0038] Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the lightning protection methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0039] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A lightning current detection device, characterized in that, The lightning current detection device (10) includes: The detection component (101) includes a conductive needle core (1011), an induction coil (1012) surrounding the conductive needle core (1011), and a conditioner (1013) connected to the induction coil (1012). The conductive needle core (1011) is connected to a first end of a coaxial cable (20) via a first connector (a) and to a second end of the coaxial cable (20) via a second connector (b). The conductive needle core (1011) is used to transmit data signals on the coaxial cable (20), the induction coil (1012) is used to detect real-time current signals on the coaxial cable (20), and the conditioner (1013) is used to convert the real-time current signals into real-time voltage signals proportional to the current amplitude. The fixing assembly (102) includes an insulator (1021) and a housing (1022) located outside the insulator (1021), the housing (1022) being grounded; the insulator (1021) is used to fix the conductive needle core (1011) and the induction coil (1012), and the conductive needle core (1011) and the induction coil (1012) are coaxial.

2. The lightning current detection device according to claim 1, characterized in that, Both the first connector (a) and the second connector (b) are radio frequency connectors with a bandwidth of DC to 30 GHz.

3. The lightning current detection device according to claim 2, characterized in that, The conductive needle core (1011) and the inner cavity of the housing (1022) are coaxial, and both the outer circular surface of the conductive needle core (1011) and the inner cavity surface of the housing (1022) are provided with a smooth coating, the conductivity of which is at least [value missing]. .

4. The lightning current detection device according to claim 3, characterized in that, The insulator (1021) includes a first circular tube and a second circular tube. The inner wall of the first circular tube is in close contact with the outer circular surface of the conductive needle core (1011). The outer wall of the first circular tube is in close contact with the inner surface of the induction coil (1012). The inner wall of the second circular tube is in close contact with the outer surface of the induction coil (1012). The outer wall of the second circular tube is in close contact with the inner surface of the housing (1022).

5. The lightning current detection device according to claim 4, characterized in that, The outer diameter of the conductive needle core (1011) The inner diameter of the housing (1022) The relative permittivity of the material of the insulator (1021) satisfy The relative permittivity of the material of the insulator (1021) .

6. The lightning current detection device according to any one of claims 1 to 5, characterized in that, The induction coil (1012) is a Rogowski coil, and the outer diameter of the Rogowski coil is no greater than [missing value]. .

7. The lightning current detection device according to claim 6, characterized in that, The conditioner (1013) includes an operational amplifier, a first resistor, a capacitor, and a second resistor. The first end of the first resistor is connected to the induction coil (1012). The second end of the first resistor is connected to the inverting input terminal of the operational amplifier and the first end of the capacitor, respectively. The second end of the capacitor is connected to the output terminal of the operational amplifier. The first end of the second resistor is connected to the non-inverting input terminal of the operational amplifier, and the second end of the second resistor is grounded.

8. The lightning current detection device according to claim 7, characterized in that, The output voltage of the operational amplifier ,in Represents the mutual inductance coefficient of the coils. This indicates the resistance value of the first resistor. This indicates the capacitance value. This indicates the real-time current signal on the coaxial cable.

9. A lightning protection device, characterized in that, The lightning protection device (30) includes a controller (301) and a lightning current detection device (10) as described in any one of claims 1 to 8, wherein the controller (301) is connected to the conditioner (1013) of the lightning current detection device (10).

10. A lightning protection method, characterized in that, The lightning protection method is used in the controller of the lightning protection device according to claim 9, and the lightning protection method includes: Acquire the real-time voltage signal converted by the conditioner in the lightning protection device; Calculate the amplitude change rate corresponding to the real-time voltage signal, and after the lightning strike process ends, accumulate the final number of times the amplitude change rate is greater than or equal to a preset change rate threshold; Based on the preset mapping relationship between the number of times the threshold is exceeded and the remaining service life, the remaining service life of the device corresponding to the final number of times is determined.

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