A large through-current low residual voltage compatible lightning arrester and control method, device and medium using the same

Abstract

The present application discloses a large-current low-residual-voltage compatible lightning arrester and a control method, device and medium using the same, and relates to the technical field of lightning arresters. The lightning arrester comprises at least one switch-type device and at least one voltage-limiting device, wherein the switch-type device adopts a multi-stage series structure; the switch-type device and the voltage-limiting device are connected in parallel, wherein the parallel position of the voltage-limiting device is selected according to the matching condition between the breakdown voltage of each gap and the limiting voltage of the voltage-limiting device; the impulse current tolerance value of the voltage-limiting device is greater than or equal to a specified multiple of a preset calculated value; the preset calculated value is calculated based on the device parameters, working condition parameters and safety margin of the voltage-limiting device; the residual voltage value of the voltage-limiting device is greater than or equal to a specified multiple of the breakdown voltage of the corresponding parallel-connected switch-type device; the present application has the effect of improving the response speed and reducing the heat generation while maintaining a high current-carrying capacity.

Description

Technical Field

[0001] The present application relates to the technical field of lightning arresters, and in particular to a large-through-current and low-residual-pressure compatible lightning arrester and a control method, device and medium using the same. Background Art

[0002] In power systems and electronic equipment, lightning arresters are an important protective device used to prevent lightning overvoltage from damaging equipment; existing lightning arresters are generally divided into two categories: switching devices and voltage-limiting devices.

[0003] Switching devices:

[0004] Advantages: large flow rate, strong impact resistance and low heat generation.

[0005] Disadvantages: Slow response speed, startup time is generally greater than 100 nanoseconds.

[0006] Voltage-limiting devices:

[0007] Advantages: fast response speed, the response time is generally less than 25 nanoseconds.

[0008] Disadvantages: high heat generation and weaker impact tolerance compared to switching devices.

[0009] Although both devices have their own advantages and disadvantages, in practical applications, a single type of lightning arrester often cannot meet the requirements of high current capacity and fast response at the same time; therefore, a new lightning arrester design is needed that can improve the response speed and reduce heat generation while maintaining high current capacity. Summary of the invention

[0010] In order to improve the response speed and reduce the heat generation while maintaining high flow capacity, the present application provides a large flow and low residual pressure compatible lightning arrester and a control method, device and medium using the same.

[0011] In the first aspect, the invention objective of the present application is achieved by adopting the following technical solutions:

[0012] A large through-current and low residual voltage compatible lightning arrester, the lightning arrester comprising:

[0013] At least one switch type device and at least one voltage limiting device, wherein the switch type device adopts a multi-stage series structure;

[0014] The switch type device and the voltage limiting type device are connected in parallel, wherein the parallel position of the voltage limiting type device is selected according to the matching condition between the breakdown voltage of each gap and the limiting voltage of the voltage limiting type device;

[0015] The impulse current tolerance value of the voltage limiting device is greater than or equal to a specified multiple of a preset calculated value; the preset calculated value is calculated based on device parameters, working condition parameters and safety margin influence of the voltage limiting device;

[0016] The residual voltage value of the voltage-limiting device is greater than or equal to a specified multiple of the breakdown voltage of the corresponding switching device connected in parallel.

[0017] By adopting the above technical scheme, a large-current low-residual-voltage compatible lightning arrester is provided. By connecting the voltage-limiting device and the switching device in parallel, the fast response characteristics of the voltage-limiting device are utilized, so that the device can be quickly started before the impact current reaches the peak value, thereby effectively protecting the circuit from the influence of overvoltage. The switching device adopts a multi-stage series structure, which improves its current storage and interruption capability, and can effectively discharge the current in a large current impact mode to protect the back-end equipment from damage. The parallel position of the voltage-limiting device can be selected according to the matching condition of the breakdown voltage of each gap and the limiting voltage of the voltage-limiting device, thereby ensuring that the voltage-limiting device can effectively limit the voltage and reduce the heat generation at the initial stage of startup. At the same time, the impact current tolerance value of the voltage-limiting device is greater than or equal to a specified multiple of the preset calculated value. The preset calculated value is calculated based on the device parameters, working condition parameters and safety margin of the voltage-limiting device, thereby ensuring that the device can still work normally under extreme conditions, thereby improving the performance reliability of the lightning arrester.

[0018] In the second aspect, the invention objective of the present application is achieved by adopting the following technical solutions:

[0019] A control method based on a large through-current and low residual voltage compatible lightning arrester is applied to a large through-current and low residual voltage compatible lightning arrester as described above, and the method comprises:

[0020] Acquire installation information and design parameters of the lightning arrester, and predict a first predicted impulse current in a power grid environment and a second predicted impulse current in a device protection state according to the installation information and design parameters of the lightning arrester;

[0021] Generating a lightning arrester response characteristic comparison table for adjusting the lightning arrester response characteristic according to the lightning arrester design parameters, the first predicted impulse current, and the second predicted impulse current;

[0022] Acquire a lightning arrester response characteristic change reference range representing a lightning arrester response characteristic change threshold, and generate a lightning arrester response characteristic control model according to the lightning arrester response characteristic change reference range and the lightning arrester response characteristic comparison table;

[0023] A first actual impulse current is obtained, and the first actual impulse current is input into the lightning arrester response characteristic control model to adjust the response speed and current carrying capacity of the lightning arrester.

[0024] By adopting the above technical scheme, the voltage-limiting device and the switching device are connected in parallel. By utilizing the fast response characteristics of the voltage-limiting device, it can be quickly started before the impact current reaches its peak value, effectively protecting the circuit from the influence of overvoltage. The response time of the voltage-limiting device is less than 25 nanoseconds, and it can be quickly started before the impact current reaches its peak value to provide immediate protection; the switching device adopts a multi-stage series structure, which improves its follow-up current breaking capability, and can effectively discharge the current during a large current impact to protect the back-end equipment from damage. The switching device has a large flow rate and strong impact resistance, and can withstand impact currents of up to 100kA or more. The present invention realizes multiple technical effects of large flow rate, low residual pressure, fast response and low heat generation through reasonable device combination and parameter matching, combined with intelligent adjustment and optimization technology, and significantly improves the performance and reliability of the lightning arrester.

[0025] In a preferred example of the present application, the step of obtaining installation information and design parameters of a lightning arrester, and predicting a first predicted impulse current in a power grid environment and a second predicted impulse current in a device protection state according to the installation information and design parameters of the lightning arrester, specifically includes:

[0026] Obtaining lightning arrester installation information and lightning arrester design parameters, wherein the lightning arrester installation information includes the maximum continuous operating voltage of the installation environment, the grid characteristics of the installation location, and the distance of possible interference sources nearby, and the lightning arrester design parameters include the maximum flow rate of the lightning arrester, the residual voltage value of the voltage-limiting device, and the starting voltage value of the switch device;

[0027] Determining a first predicted impact current that may occur in a power grid environment according to the maximum continuous operating voltage, the power grid characteristics, and the interference source distance;

[0028] The second predicted impact current required for the equipment protection state is determined according to the maximum flow rate, the residual voltage value, the starting voltage value and the grid characteristics of the installation location.

[0029] By adopting the above technical solution, the maximum continuous operating voltage of the lightning arrester installation environment, grid characteristics, distance from interference sources, maximum current flow of the lightning arrester, residual voltage value of voltage-limiting devices and starting voltage value of switching devices are comprehensively considered to ensure the reliability of the lightning arrester in various complex environments. Through comprehensive parameter analysis and prediction, the lightning arrester can maintain stable protection performance in different power grid environments and reduce the risk of protection failure caused by environmental changes. By obtaining detailed installation information and design parameters, the lightning arrester can dynamically adjust its protection strategy according to changes in the actual working environment to ensure that the best protection effect can be provided in different scenarios.

[0030] In a preferred example of the present application, generating a lightning arrester response characteristic comparison table for adjusting the lightning arrester response characteristic according to the lightning arrester design parameters, the first predicted impulse current and the second predicted impulse current specifically includes:

[0031] Acquire a predicted protection time according to the maximum flow rate, the first predicted impact current, and the second predicted impact current, and acquire a designed protection time according to the maximum continuous operating voltage and the maximum flow rate;

[0032] Obtaining a predicted response speed of the lightning arrester according to the residual voltage value of the voltage-limiting device, the predicted protection time and the designed protection time;

[0033] Calculating a ratio of the first predicted impact current to the second predicted impact current to obtain a predicted impact current ratio for predicting an actual impact current;

[0034] Calculate the protection time difference between the predicted protection time and the designed protection time, and calculate the response speed difference between the predicted response speed and the designed response speed;

[0035] According to the protection time difference and the response speed difference, a predicted response speed-time correspondence for determining an actual response speed of the lightning arrester is obtained, and a lightning arrester response characteristic comparison table for comparing and adjusting the lightning arrester response characteristic is generated.

[0036] By adopting the above technical scheme, the predicted protection time and the designed protection time can be accurately calculated, and the protection capability of the lightning arrester under different impulse current conditions can be accurately evaluated. By comprehensively considering the residual voltage value and protection time of the voltage-limiting device, the response speed of the lightning arrester under different impulse current conditions can be accurately predicted. By calculating the impulse current ratio, the size and change trend of the actual impulse current can be more accurately predicted, providing a scientific basis for the dynamic adjustment of the lightning arrester. By calculating the protection time difference and the response speed difference, the performance difference of the lightning arrester under actual working conditions can be evaluated. By generating a corresponding relationship between the predicted response speed and time, a response characteristic model of the lightning arrester under different impulse current conditions can be established, providing a scientific basis for dynamically adjusting the response speed and current-carrying capacity of the lightning arrester.

[0037] In a preferred example, the present application further includes a lightning arrester monitoring system, which, before judging the first predicted impact current that may occur in the power grid environment according to the maximum continuous operating voltage, the power grid characteristics and the interference source distance, further includes:

[0038] Acquire the sensitivity parameter of the lightning arrester monitoring system, and determine the initial response speed of the lightning arrester according to the power grid characteristics and the sensitivity parameter of the monitoring system;

[0039] According to the initial response speed, obtaining a first coefficient for adjusting a first predicted impulse current;

[0040] The determining, according to the maximum continuous operating voltage, the grid characteristics, and the interference source distance, of a first predicted inrush current that may occur in a grid environment specifically includes:

[0041] A first predicted impact current that may occur in a power grid environment is determined according to the first coefficient, the maximum continuous operating voltage, the power grid characteristic, and the interference source distance.

[0042] By adopting the above technical scheme, comprehensively considering the first coefficient, the maximum continuous operating voltage, the grid characteristics and the distance from the interference source, it is possible to more accurately judge the first predicted impulse current that may occur in the grid environment, and provide a scientific basis for the parameter setting and adjustment of the lightning arrester. The present invention obtains the sensitivity parameters of the lightning arrester monitoring system, optimizes the initial response speed, and adjusts the first predicted impulse current accordingly, thereby achieving precise control of the response characteristics of the lightning arrester, significantly improving the protection accuracy, response speed and system reliability of the lightning arrester, and ensuring that effective protection can be provided under various working conditions.

[0043] In a preferred example of the present application, the obtaining of the first actual impulse current and inputting the first actual impulse current into the lightning arrester response characteristic control model to adjust the response speed and current carrying capacity of the lightning arrester specifically include:

[0044] Obtaining a first actual impulse current, inputting the first actual impulse current into the lightning arrester response characteristic control model, and obtaining a lightning arrester response characteristic adjustment value;

[0045] The response speed and current carrying capacity of the lightning arrester are adjusted according to the lightning arrester response characteristic adjustment value.

[0046] By adopting the above-mentioned technical scheme, the actual impact current is monitored in real time, and the impact current data actually occurring in the power grid can be obtained in time. The adjustment value calculated by the lightning arrester response characteristic control model can be used to dynamically adjust the response speed of the lightning arrester to ensure that when the impact current occurs, the lightning arrester can be quickly started to provide timely protection. The present application can also adjust the current carrying capacity of the lightning arrester to ensure that the current can be effectively discharged during a large current impact to protect the back-end equipment from damage. Through real-time monitoring and dynamic adjustment, the lightning arrester can better adapt to different power grid environments and impact current changes, ensuring that effective protection can be provided under various complex conditions.

[0047] In a preferred example of the present application: adjusting the response speed and the flow capacity of the lightning arrester according to the lightning arrester response characteristic adjustment value specifically includes:

[0048] Acquire the current working state information of the lightning arrester, and generate a specific first adjustment instruction according to the current working state information of the lightning arrester and the adjustment value of the response characteristic of the lightning arrester, wherein the first adjustment instruction includes a multi-stage series structure adjustment instruction of the switch type device, a parallel position adjustment instruction of the voltage limiting device, an impulse current tolerance adjustment instruction of the voltage limiting device, and a residual voltage value adjustment instruction of the voltage limiting device;

[0049] The first adjustment instruction is executed.

[0050] By adopting the above technical solution, the working status information is obtained in real time and a specific first adjustment instruction is generated, so that the response speed of the lightning arrester can be dynamically adjusted to ensure that it can be quickly started when a surge current occurs and provide timely protection. The response speed of the lightning arrester is optimized and it can be quickly started before the surge current reaches its peak, effectively preventing overvoltage from damaging the equipment. Based on the multi-stage series structure of the dynamically adjusted switching device, the current carrying capacity is optimized to ensure that the current can be effectively discharged during a large current shock to protect the back-end equipment from damage. In addition, the current carrying capacity of the lightning arrester is improved to provide reliable protection under high surge current conditions.

[0051] In a preferred example of the present application: when executing the first adjustment instruction, the control method further includes:

[0052] Acquire real-time detection information of the lightning arrester monitoring system, compare the real-time detection information with the corresponding response characteristic value in the lightning arrester response characteristic comparison table, and obtain a response characteristic difference value;

[0053] Compare the response characteristic difference value with a preset change threshold value, and if the response characteristic difference value is outside the preset change threshold value range, trigger a response characteristic change information collection instruction;

[0054] Acquiring secondary adjustment parameter information according to the response characteristic change information collection instruction;

[0055] A secondary adjustment instruction is triggered according to the secondary adjustment parameter information.

[0056] By adopting the above technical solution, the working status of the lightning arrester can be monitored in real time, and the actual response characteristics of the lightning arrester can be obtained in time, and compared with the preset response characteristic comparison table to ensure that the actual performance of the lightning arrester is consistent with expectations; by setting the preset change threshold, it can intelligently determine whether the actual response characteristics of the lightning arrester deviate from the expected value. If it exceeds the threshold range, the system will automatically trigger the response characteristic change information collection instruction to ensure timely adjustment. At the same time, by collecting the response characteristic change information, more detailed adjustment parameters can be obtained to provide a scientific basis for subsequent secondary adjustments.

[0057] In the third aspect, the invention objective of the present application is achieved by adopting the following technical solutions:

[0058] A computer device comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the control method based on a large through-current and low residual voltage compatible lightning arrester are implemented.

[0059] In a fourth aspect, the invention objective of the present application is achieved by adopting the following technical solutions:

[0060] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned control method based on a large-through-current and low-residual-voltage compatible lightning arrester are implemented.

[0061] In summary, the present application includes at least one of the following beneficial technical effects:

[0062] 1. Provide a large-current low-residual-voltage compatible lightning arrester. By connecting a voltage-limiting device in parallel with a switch-type device, and utilizing the fast response characteristics of the voltage-limiting device, it can be quickly started before the impact current reaches a peak value, effectively protecting the circuit from overvoltage; the switch-type device adopts a multi-stage series structure, which improves its current storage and interruption capability, and can effectively discharge current in a large current impact mode to protect the back-end equipment from damage, and the parallel position of the voltage-limiting device can be selected according to the breakdown voltage of each gap and the matching condition of the voltage-limiting device limiting voltage, ensuring that the voltage-limiting device can effectively limit the voltage at the initial start-up and reduce heat generation. At the same time, the impact current tolerance value of the voltage-limiting device is greater than or equal to a specified multiple of a preset calculated value, and the preset calculated value is calculated based on the device parameters, working condition parameters and safety margin of the voltage-limiting device, ensuring that it can still work normally under extreme conditions, thereby improving the performance reliability of the lightning arrester;

[0063] 2. By comprehensively considering the first coefficient, the maximum continuous operating voltage, the grid characteristics and the distance from the interference source, it is possible to more accurately judge the first predicted impulse current that may occur in the grid environment, and provide a scientific basis for the parameter setting and adjustment of the lightning arrester. The present invention obtains the sensitivity parameters of the lightning arrester monitoring system, optimizes the initial response speed, and adjusts the first predicted impulse current accordingly, thereby achieving precise control of the response characteristics of the lightning arrester, significantly improving the protection accuracy, response speed and system reliability of the lightning arrester, and ensuring effective protection under various working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 This is an application example diagram of a large through-current and low residual pressure compatible lightning arrester in one embodiment of the present application;

[0065] Figure 2 This is a discharge current test waveform diagram of a large through-current and low residual voltage compatible lightning arrester in one embodiment of the present application when determining the withstand current of a voltage-limiting device, and the impulse current is 30kA;

[0066] Figure 3 It is a current test waveform diagram of a large through-current and low residual voltage compatible lightning arrester in one embodiment of the present application when determining the ignition voltage value of a switch-type device, and the impulse current is 30kA;

[0067] Figure 4 It is a flow chart of the steps in a control method based on a large through-current and low residual voltage compatible lightning arrester in one embodiment of the present application;

[0068] Figure 5 It is a schematic diagram of a device in an embodiment of the present application. DETAILED DESCRIPTION

[0069] The present application is further described in detail below in conjunction with the accompanying drawings.

[0070] In one embodiment, if Figure 1 As shown, the present application discloses a high-through-current and low-residual-voltage compatible lightning arrester, the lightning arrester comprising at least one switch-type device and at least one voltage-limiting device. Figure 1 Take a switch type device and a voltage limiting device as an example. In actual application, the installation quantity of the switch type device and the voltage limiting device can be customized according to the needs. Figure 1 In the embodiment, the first situation is that the switch type device is directly connected in parallel with the voltage limiting device, the second situation is that the multi-pole switch type device is directly connected in parallel with the voltage limiting device, and the switch type device adopts a multi-stage series structure to form a multi-pole switch type device; the third situation is that the middle tap of the multi-pole switch type device is connected in parallel with the voltage limiting device; the switch type device and the voltage limiting device are connected in parallel, wherein the parallel position of the voltage limiting device is selected according to the matching condition of the breakdown voltage of each gap and the limiting voltage of the voltage limiting device; the impulse current tolerance value of the voltage limiting device is greater than or equal to a specified multiple of the preset calculated value; the preset calculated value is calculated based on the device parameters, working condition parameters and safety margin of the voltage limiting device; the residual voltage value of the voltage limiting device is greater than or equal to a specified multiple of the breakdown voltage of the corresponding parallel connected switch type device, and in this embodiment, the specified multiple is 1.2 times.

[0071] Furthermore, the voltage-limiting device can be connected in parallel with the switching device either directly or in parallel with the middle tap of the multi-pole switching device. The parallel position depends on the coordination between the breakdown voltage of each gap and the limiting voltage of the voltage-limiting device. The selection of the impulse withstand capability of the voltage-limiting device needs to satisfy the requirement that the residual voltage is greater than the breakdown voltage of the switching device and its own current withstand capability is greater than the impulse current at the moment the residual voltage is generated. In order to meet the product reliability requirement, the impulse current withstand In of the voltage-limiting device is selected to be more than 1.2 times the calculated value, and the residual voltage value of the voltage-limiting device is selected to be more than 1.2 times the breakdown voltage of the switching device. Implementation principle: Since the switching type device has low residual voltage and large surge current, the voltage-limiting type device has a fast response speed; the advantages of the two devices can be utilized. After connecting the two devices in parallel, a large current, low residual voltage and faster lightning current response speed of the lightning arrester can be achieved. Relying on the voltage-limiting type to quickly respond to lightning pulses, before the lightning current impact energy exceeds the tolerance limit of the voltage-limiting type device, the switching type device is started and the voltage-limiting type device is turned off at the same time, realizing the transfer of surge current from the voltage-limiting channel to the switching channel.

[0072] First, when selecting the continuous operation voltage, you can choose 385V, 440V, 690V, 750V and other values. This embodiment takes 385V as an example.

[0073] Secondly, when determining the withstand current of the voltage-limiting device:

[0074] According to the discharge current test waveform, combined with the start-up time of the gas multi-layer gap surge protector (less than 1μs), such as Figure 2 As shown in the figure, the waveform for testing the conventional impulse current of 30kA, the impulse current values ​​at 1μs are approximately 7kA, 10kA, 15kA, 20kA, 25kA, 30kA, and 35kA. In order to meet the sufficient current margin, the actual value can be slightly larger than the impulse current value at 1 microsecond. The corresponding recommended values ​​are 10kA, 15kA, 20kA, 25kA, 30kA, 35kA, and 40kA.

[0075] 1. When determining the ignition voltage value of a switching device:

[0076] The switch type starting voltage value is determined by the required voltage protection level, such as Figure 3 As shown, it is the test waveform of 30kA test current (34mm*34mm square piece is used in the test).

[0077] Fourth, when determining the starting voltage value of the voltage-limiting device:

[0078] The voltage value of the voltage-limiting device is based on the residual voltage of the voltage-limiting device at the impulse current of 10kA, 15kA, 20kA, 25kA, 30kA, 35kA, and 40kA, which must be above 1.5kV calculated in the third point above to ensure that the residual voltage of the voltage-limiting device after startup is sufficient to start the switching device. For the 34mm*34mm square varistor, Uc: 910V varistor can be obtained by querying the characteristic parameters. The specific values ​​are shown in Table 1.

[0079] Table 1:

[0080] In one embodiment, if Figure 4 As shown, a control method based on a large through-current and low residual voltage compatible lightning arrester is provided, and the control method based on a large through-current and low residual voltage compatible lightning arrester is applied to a large through-current and low residual voltage compatible lightning arrester.

[0081] A control method based on a large through-current and low residual voltage compatible lightning arrester specifically comprises the following steps:

[0082] S1: Obtain installation information and design parameters of the lightning arrester, and predict a first predicted impulse current in a power grid environment and a second predicted impulse current in a device protection state according to the installation information and design parameters of the lightning arrester.

[0083] In this embodiment, the implementation steps of step S1 include:

[0084] S11: Obtain the installation information and design parameters of the lightning arrester. The installation information of the lightning arrester includes the maximum continuous operating voltage of the installation environment, the grid characteristics of the installation location, and the distance of possible interference sources nearby. The design parameters of the lightning arrester include the maximum current flow of the lightning arrester, the residual voltage value of the voltage-limiting device, and the starting voltage value of the switching device.

[0085] In this embodiment, the lightning arrester installation information includes installation environment parameters, such as maximum continuous operating voltage, grid characteristics, interference source distance, etc. The installation information directly affects the working environment of the lightning arrester; the design parameters include parameters of the lightning arrester itself, such as maximum flow rate, residual voltage value of voltage-limiting devices, starting voltage value of switching devices, etc. The design parameters determine the performance of the lightning arrester.

[0086] S12: Determine the first predicted impact current that may occur in the power grid environment according to the maximum continuous operating voltage, power grid characteristics and the distance to the interference source.

[0087] In this embodiment, the first predicted impact current refers to the maximum impact current that may occur in a power grid environment, and is used to evaluate the protection capability of the lightning arrester under normal working conditions.

[0088] S13: Determine the second predicted impact current required for the equipment protection state according to the maximum flow rate, the residual voltage value, the starting voltage value and the grid characteristics of the installation location.

[0089] In this embodiment, the second predicted impulse current refers to the impulse current required in the equipment protection state, which is used to ensure the protection effect of the lightning arrester under extreme conditions.

[0090] For example, in a substation of a high-voltage transmission line, a large-current, low-residual-voltage compatible lightning arrester is installed. By obtaining the maximum continuous operating voltage Uc=385V of the substation, the grid characteristics (such as frequency, fluctuation range) and the distance of possible interference sources nearby (such as lightning activity frequency, soil resistivity), the first predicted impulse current is predicted to be 80kA; at the same time, based on the maximum current of the lightning arrester of 100kA, the residual voltage value of the voltage-limiting device of 700V and the starting voltage value of the switching device of 500V, the second predicted impulse current required for the equipment protection state is predicted to be 90kA.

[0091] S2: generating a lightning arrester response characteristic comparison table for comparing and adjusting the lightning arrester response characteristic according to the lightning arrester design parameters, the first predicted impulse current, and the second predicted impulse current.

[0092] In this embodiment, step S2 includes the following steps:

[0093] S21: Obtain the predicted protection time according to the maximum flow rate, the first predicted impact current and the second predicted impact current, and obtain the designed protection time according to the maximum continuous operating voltage and the maximum flow rate.

[0094] Specifically, the predicted protection time refers to the protection time of the lightning arrester under the predicted impulse current conditions; the designed protection time refers to the protection time of the lightning arrester under the designed parameter conditions.

[0095] S22: Obtain the predicted response speed of the lightning arrester according to the residual voltage value, the predicted protection time and the designed protection time of the voltage-limiting device.

[0096] Specifically, the predicted response speed refers to the response speed of the lightning arrester under the predicted impulse current conditions, and the designed response speed refers to the response speed of the lightning arrester under the designed parameter conditions.

[0097] S23: Calculate the ratio of the first predicted impact current to the second predicted impact current to obtain a predicted impact current ratio for predicting the actual impact current.

[0098] Specifically, the predicted impact current ratio refers to the ratio of the first predicted impact current to the second predicted impact current, and is used to evaluate the change trend of the actual impact current.

[0099] S24: Calculate the protection time difference between the predicted protection time and the designed protection time, and calculate the response speed difference between the predicted response speed and the designed response speed.

[0100] Specifically, the protection time difference refers to the difference between the predicted protection time and the designed protection time, which is used to evaluate the performance difference of the lightning arrester under actual working conditions; the response speed difference refers to the difference between the predicted response speed and the designed response speed, which is used to evaluate the response speed difference of the lightning arrester under actual working conditions.

[0101] S25: According to the protection time difference and the response speed difference, a predicted response speed-time correspondence for determining the actual response speed of the lightning arrester is obtained, and a lightning arrester response characteristic comparison table for comparing and adjusting the lightning arrester response characteristics is generated.

[0102] For example, in the above-mentioned substation, by calculating the maximum flow rate of 100kA, the first predicted impulse current of 80kA, and the second predicted impulse current of 90kA, the predicted protection time is 10μs, and the designed protection time is 15μs. According to the residual voltage value of the voltage-limiting device of 700V, the predicted response speed is 5μs, and the designed response speed is 7μs. The calculated predicted impulse current ratio is 0.89, the protection time difference is 5μs, and the response speed difference is 2μs. Generate a lightning arrester response characteristic comparison table for comparison and adjustment of the response speed and flow capacity of the lightning arrester.

[0103] S3: obtaining a lightning arrester response characteristic change reference range representing a lightning arrester response characteristic change threshold, and generating a lightning arrester response characteristic control model according to the lightning arrester response characteristic change reference range and a lightning arrester response characteristic comparison table.

[0104] In this embodiment, the response characteristic change threshold refers to the allowable change range of the lightning arrester response characteristic, which is used to determine whether the actual response characteristic of the lightning arrester needs to be adjusted; the lightning arrester response characteristic change reference range is the response characteristic change range set according to the design parameters and working conditions of the lightning arrester.

[0105] Specifically, the threshold of the lightning arrester response characteristic change is set to ±10%, that is, the response time change does not exceed 1μs, and the current capacity change does not exceed 10kA. Based on the generated lightning arrester response characteristic comparison table and the set response characteristic change reference range, a lightning arrester response characteristic control model is generated to dynamically adjust the response speed and current capacity of the lightning arrester.

[0106] S4: Obtaining a first actual impulse current, and inputting the first actual impulse current into a lightning arrester response characteristic control model to adjust a response speed and a current carrying capacity of the lightning arrester.

[0107] In this embodiment, step S4 specifically includes the following steps:

[0108] S41: Obtain a first actual impulse current, input the first actual impulse current into a lightning arrester response characteristic control model, and obtain an adjustment value of the lightning arrester response characteristic.

[0109] In this embodiment, the first actual impulse current refers to the impulse current actually detected by the lightning arrester, and the lightning arrester response characteristic adjustment value is an adjustment value calculated according to the first actual impulse current and the lightning arrester response characteristic control model.

[0110] S42: Adjust the response speed and current carrying capacity of the lightning arrester according to the lightning arrester response characteristic adjustment value.

[0111] In this embodiment, the lightning arrester response characteristic adjustment value includes a response speed adjustment value and a current flow capacity adjustment value; the response speed adjustment value is the amount by which the lightning arrester response speed needs to be adjusted calculated based on the lightning arrester response characteristic control model, and the current flow capacity adjustment value is the amount by which the current flow capacity needs to be adjusted calculated based on the lightning arrester response characteristic control model.

[0112] S43: Acquire real-time detection information of the lightning arrester monitoring system, compare the real-time detection information with the corresponding response characteristic value in the lightning arrester response characteristic comparison table, and obtain a response characteristic difference value.

[0113] In this embodiment, real-time detection information refers to the lightning arrester working status information collected in real time by the lightning arrester monitoring system, including ambient temperature, humidity, grid load conditions, etc.; the response characteristic difference value refers to the difference between the real-time detection information and the corresponding response characteristic value in the lightning arrester response characteristic comparison table.

[0114] S44: Compare the response characteristic difference value with a preset change threshold value, and if the response characteristic difference value is outside the preset change threshold range, trigger a response characteristic change information collection instruction.

[0115] In this embodiment, the change threshold is the set allowable change range of the response characteristic; the response characteristic change information collection instruction refers to an information collection instruction triggered when the response characteristic difference value exceeds the change threshold.

[0116] S45: Acquire secondary adjustment parameter information according to the response characteristic change information collection instruction.

[0117] In this embodiment, the secondary adjustment parameter information refers to the detailed adjustment parameters acquired according to the response characteristic change information collection instruction.

[0118] S46: triggering a secondary adjustment instruction according to the secondary adjustment parameter information.

[0119] In this embodiment, the secondary adjustment instruction refers to an adjustment instruction triggered according to the secondary adjustment parameter information.

[0120] Specifically, trigger the response characteristic change information collection instruction to obtain the secondary adjustment parameter information, including adjusting the multi-stage series structure of the switch type device, the parallel position of the voltage limiting device, the impact current tolerance and residual voltage value of the voltage limiting device; according to the secondary adjustment parameter information, trigger the secondary adjustment instruction to further optimize the response speed and current carrying capacity of the lightning arrester. By triggering the secondary adjustment instruction, the response speed and current carrying capacity of the lightning arrester can be further optimized to ensure that the current can be effectively discharged in the event of a large current shock, thereby protecting the back-end equipment from damage.

[0121] In one embodiment, in step S42, adjusting the response speed and current carrying capacity of the lightning arrester according to the lightning arrester response characteristic adjustment value specifically includes:

[0122] S421: Obtain the current working status information of the lightning arrester, and generate a specific first adjustment instruction according to the current working status information of the lightning arrester and the adjustment value of the lightning arrester response characteristic. The first adjustment instruction includes a multi-stage series structure adjustment instruction of the switch type device, a parallel position adjustment instruction of the voltage limiting device, an impulse current tolerance adjustment instruction of the voltage limiting device, and a residual voltage value adjustment instruction of the voltage limiting device.

[0123] In this embodiment, the multi-stage series structure adjustment instruction is generated according to the current working state and the response characteristic adjustment value, and the instruction for adjusting the multi-stage series structure of the switching device is generated, such as increasing or decreasing the number of devices in series; the parallel position adjustment instruction is generated according to the current working state and the response characteristic adjustment value, and the instruction for adjusting the parallel position of the voltage-limiting device is generated, and the optimal parallel position is selected to optimize the response speed.

[0124] S422: Execute the first adjustment instruction.

[0125] In this embodiment, the content of the first adjustment instruction when executed includes:

[0126] Adjust the multi-stage series structure of switch-type devices: According to the multi-stage series structure adjustment instructions, dynamically change the number of stages of switch-type devices to optimize the response speed and current capacity.

[0127] Adjust the parallel position of the voltage-limiting device: According to the parallel position adjustment instruction, select the most appropriate parallel position to optimize the response speed and current capacity.

[0128] Adjust the surge current tolerance of the voltage-limiting device: According to the surge current tolerance adjustment instruction, dynamically adjust the surge current tolerance value of the voltage-limiting device to ensure that the current can be effectively discharged when a large current surge occurs.

[0129] Adjust the residual voltage value of the voltage-limiting device: According to the residual voltage value adjustment instruction, the residual voltage value of the voltage-limiting device is dynamically adjusted to ensure its effectiveness in protecting the equipment.

[0130] For example, suppose a high-current, low-residual-voltage compatible lightning arrester is installed in a substation of a high-voltage transmission line. The following is an example of a specific application scenario:

[0131] Get the current working status information of the lightning arrester:

[0132] The temperature sensor monitors the current ambient temperature to be 30°C; the humidity sensor monitors the current ambient humidity to be 60%; the current sensor monitors the current grid load to be 80%.

[0133] The current response speed of the lightning arrester is recorded as 5μs, the current carrying capacity is 80kA, the residual voltage value of the voltage-limiting device is 700V, and the starting voltage value is 500V.

[0134] Generate the first adjustment instruction:

[0135] Generate the first adjustment instruction according to the current working status information and the adjustment value of the lightning arrester response characteristic:

[0136] Multi-stage series structure adjustment instruction: add one stage in series to improve the flow capacity.

[0137] Parallel position adjustment command: Select a parallel position closer to the front end to optimize the response speed.

[0138] Inrush current tolerance adjustment instruction: Increase the inrush current tolerance value to 90kA.

[0139] Residual voltage value adjustment instruction: reduce the residual voltage value to 650V.

[0140] It should be understood that the serial numbers of the steps in the above embodiments do not imply a sequence of execution. The execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0141] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 5 As shown. The computer device includes a processor, a memory, a network interface and a database connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store a lightning arrester response characteristic comparison table and a lightning arrester response characteristic control model, etc. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a control method based on a large through-current low residual pressure compatible lightning arrester is implemented.

[0142] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the following steps when executing the computer program:

[0143] S1: Obtain installation information and design parameters of the lightning arrester, and predict a first predicted impulse current in a power grid environment and a second predicted impulse current in a device protection state according to the installation information and design parameters of the lightning arrester;

[0144] S2: generating a lightning arrester response characteristic comparison table for adjusting the lightning arrester response characteristic according to the lightning arrester design parameters, the first predicted impulse current, and the second predicted impulse current;

[0145] S3: obtaining a lightning arrester response characteristic change reference range representing a lightning arrester response characteristic change threshold, and generating a lightning arrester response characteristic control model according to the lightning arrester response characteristic change reference range and a lightning arrester response characteristic comparison table;

[0146] S4: Obtaining a first actual impulse current, and inputting the first actual impulse current into a lightning arrester response characteristic control model to adjust a response speed and a current carrying capacity of the lightning arrester.

[0147] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0148] S1: Obtain installation information and design parameters of the lightning arrester, and predict a first predicted impulse current in a power grid environment and a second predicted impulse current in a device protection state according to the installation information and design parameters of the lightning arrester;

[0149] S2: generating a lightning arrester response characteristic comparison table for adjusting the lightning arrester response characteristic according to the lightning arrester design parameters, the first predicted impulse current, and the second predicted impulse current;

[0150] S3: obtaining a lightning arrester response characteristic change reference range representing a lightning arrester response characteristic change threshold, and generating a lightning arrester response characteristic control model according to the lightning arrester response characteristic change reference range and a lightning arrester response characteristic comparison table;

[0151] S4: Obtaining a first actual impulse current, and inputting the first actual impulse current into a lightning arrester response characteristic control model to adjust a response speed and a current carrying capacity of the lightning arrester.

[0152] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0153] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0154] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments may still be modified, or some of the features thereof may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A control method based on a large through-current and low residual voltage compatible lightning arrester, characterized in that: Applied to a large through-current and low residual voltage compatible lightning arrester, the method includes: Acquire installation information and design parameters of the lightning arrester, and predict a first predicted impulse current in a power grid environment and a second predicted impulse current in a device protection state according to the installation information and design parameters of the lightning arrester; Generating a lightning arrester response characteristic comparison table for adjusting the lightning arrester response characteristic according to the lightning arrester design parameters, the first predicted impulse current, and the second predicted impulse current; Acquire a lightning arrester response characteristic change reference range representing a lightning arrester response characteristic change threshold, and generate a lightning arrester response characteristic control model according to the lightning arrester response characteristic change reference range and the lightning arrester response characteristic comparison table; Acquire a first actual impulse current, and input the first actual impulse current into the lightning arrester response characteristic control model to adjust the response speed and current carrying capacity of the lightning arrester; The lightning arrester comprises: At least one switch type device and at least one voltage limiting device, wherein the switch type device adopts a multi-stage series structure; The switch type device and the voltage limiting type device are connected in parallel, wherein the parallel position of the voltage limiting type device is selected according to the matching condition between the breakdown voltage of each gap and the limiting voltage of the voltage limiting type device; The impulse current tolerance value of the voltage limiting device is greater than or equal to a specified multiple of a preset calculated value; the preset calculated value is calculated based on device parameters, working condition parameters and safety margin influence of the voltage limiting device; The residual voltage value of the voltage-limiting device is greater than or equal to a specified multiple of the breakdown voltage of the corresponding switching device connected in parallel.

2. According to claim 1, a control method based on a large through-current and low residual voltage compatible lightning arrester is characterized in that: The obtaining of installation information and design parameters of the lightning arrester, and predicting a first predicted impulse current in a power grid environment and a second predicted impulse current in a device protection state according to the installation information and design parameters of the lightning arrester, specifically includes: Obtaining lightning arrester installation information and lightning arrester design parameters, wherein the lightning arrester installation information includes the maximum continuous operating voltage of the installation environment, the grid characteristics of the installation location, and the distance of possible interference sources nearby, and the lightning arrester design parameters include the maximum flow rate of the lightning arrester, the residual voltage value of the voltage-limiting device, and the starting voltage value of the switch device; Determining a first predicted impact current that may occur in a power grid environment according to the maximum continuous operating voltage, the power grid characteristics, and the interference source distance; The second predicted impact current required for the equipment protection state is determined according to the maximum flow rate, the residual voltage value, the starting voltage value and the grid characteristics of the installation location.

3. A control method based on a large through-current and low residual voltage compatible lightning arrester according to claim 2, characterized in that: The generating, according to the lightning arrester design parameter, the first predicted impulse current and the second predicted impulse current, a lightning arrester response characteristic comparison table for adjusting the lightning arrester response characteristic by comparison specifically includes: Acquire a predicted protection time according to the maximum flow rate, the first predicted impact current, and the second predicted impact current, and acquire a designed protection time according to the maximum continuous operating voltage and the maximum flow rate; Obtaining a predicted response speed of the lightning arrester according to the residual voltage value of the voltage-limiting device, the predicted protection time and the designed protection time; Calculating a ratio of the first predicted impact current to the second predicted impact current to obtain a predicted impact current ratio for predicting an actual impact current; Calculate the protection time difference between the predicted protection time and the designed protection time, and calculate the response speed difference between the predicted response speed and the designed response speed; According to the protection time difference and the response speed difference, a predicted response speed-time correspondence for determining an actual response speed of the lightning arrester is obtained, and a lightning arrester response characteristic comparison table for comparing and adjusting the lightning arrester response characteristic is generated.

4. A control method based on a large through-current and low residual voltage compatible lightning arrester according to claim 2, characterized in that: The invention also includes a lightning arrester monitoring system, which, before judging the first predicted impact current that may occur in the power grid environment according to the maximum continuous operating voltage, the power grid characteristics and the interference source distance, also includes: Acquire the sensitivity parameter of the lightning arrester monitoring system, and determine the initial response speed of the lightning arrester according to the power grid characteristics and the sensitivity parameter of the monitoring system; According to the initial response speed, obtaining a first coefficient for adjusting a first predicted impulse current; The determining, according to the maximum continuous operating voltage, the grid characteristics, and the interference source distance, of a first predicted inrush current that may occur in a grid environment specifically includes: A first predicted impact current that may occur in a power grid environment is determined according to the first coefficient, the maximum continuous operating voltage, the power grid characteristic, and the interference source distance.

5. The control method based on a large through-current and low residual voltage compatible lightning arrester according to claim 1 is characterized in that: The obtaining of the first actual impulse current and inputting the first actual impulse current into the lightning arrester response characteristic control model to adjust the response speed and current carrying capacity of the lightning arrester specifically includes: Obtaining a first actual impulse current, inputting the first actual impulse current into the lightning arrester response characteristic control model, and obtaining a lightning arrester response characteristic adjustment value; The response speed and current carrying capacity of the lightning arrester are adjusted according to the lightning arrester response characteristic adjustment value.

6. A control method based on a large through-current and low residual voltage compatible lightning arrester according to claim 1, characterized in that: The step of adjusting the response speed and the current carrying capacity of the lightning arrester according to the lightning arrester response characteristic adjustment value specifically includes: Acquire the current working state information of the lightning arrester, and generate a specific first adjustment instruction according to the current working state information of the lightning arrester and the adjustment value of the response characteristic of the lightning arrester, wherein the first adjustment instruction includes a multi-stage series structure adjustment instruction of the switch type device, a parallel position adjustment instruction of the voltage limiting device, an impulse current tolerance adjustment instruction of the voltage limiting device, and a residual voltage value adjustment instruction of the voltage limiting device; The first adjustment instruction is executed.

7. A control method based on a large through-current and low residual voltage compatible lightning arrester according to claim 6, characterized in that: When executing the first adjustment instruction, the control method further includes: Acquire real-time detection information of the lightning arrester monitoring system, compare the real-time detection information with the corresponding response characteristic value in the lightning arrester response characteristic comparison table, and obtain a response characteristic difference value; Compare the response characteristic difference value with a preset change threshold value, and if the response characteristic difference value is outside the preset change threshold value range, trigger a response characteristic change information collection instruction; Acquiring secondary adjustment parameter information according to the response characteristic change information collection instruction; A secondary adjustment instruction is triggered according to the secondary adjustment parameter information.

8. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of a control method based on a large-through-current and low-residual-voltage compatible lightning arrester as described in any one of claims 1 to 7 are implemented.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by the processor, the steps of a control method based on a large-through-current and low-residual-voltage compatible lightning arrester as described in any one of claims 1 to 7 are implemented.

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