A triangular combined shunt lightning protection method and system

Abstract

The application discloses a kind of triangular combination formula shunt lightning protection method and system, it is related to electric power distribution network technical field, including: real-time acquisition of lightning current intensity data in distribution line by monitoring module;Issue shunt start signal, realize triangular combination shunt;In each subcycle, shunt intensity control module is weakened according to the set weakening ratio and weakens lightning current, and the current after shunt is weakened to target ratio and is introduced into earth;If lightning current intensity recovers to normal range, reset module automatically closes shunt control module and shunt intensity control module, and resets three groups of lightning arresters to standby state.The triangular combination formula shunt lightning protection method provided by the application effectively and uniformly distributes lightning current through the lightning arrester group arranged in triangle and the turn-on mechanism, prevents single lightning arrester overload, and improves system carrying capacity.Through dynamically generating threshold, combined with real-time weather and historical lightning data, the system automatically adapts to different environmental changes, and avoids protection failure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power distribution network, in particular to a triangular combined shunt lightning protection method and system. BACKGROUND

[0002] In the power distribution network system, overvoltage and high current caused by lightning current can cause serious damage to the distribution line equipment. When lightning attacks the distribution line, it is usually accompanied by extremely high transient current. If the current is not effectively shunted and weakened in time, it will cause equipment burnout, line trip and even large-scale power outage, which brings great risk to the stability of the power system and the safety of the equipment.

[0003] Current lightning protection equipment usually relies on a single arrester to protect the line by directly introducing lightning current into the ground. However, due to the unpredictable intensity of lightning current, a single arrester is prone to overload or breakdown under the impact of high-intensity lightning current, resulting in the failure of the arrester. In this case, not only the arrester itself may be damaged, but also more serious subsequent failures may be caused, especially in areas with frequent lightning, which is particularly evident.

[0004] There are some lightning current shunt protection schemes on the market at present, which use multiple arresters in parallel to improve the tolerance. However, the arrangement of parallel arresters in the prior art is mostly synchronous conduction, that is, all arresters work at the same time when lightning current appears. This method has the following defects:

[0005] When multiple arresters are synchronously conducted, they cannot effectively regulate the current, and the load distribution of each arrester is uneven, which is prone to overload and causes damage to some arresters.

[0006] Since each arrester does not have a mechanism to share the current in turn, once the current exceeds the carrying limit, the protection effect of the entire shunt system will be greatly reduced.

[0007] Traditional arrester parallel systems usually lack intelligent monitoring modules, making it difficult to real-time sense the intensity of lightning current and avoid blind shunt operation, and unable to dynamically adjust the protection strategy according to real-time monitoring data.

[0008] In actual operation of the distribution network system, it is affected by multiple factors such as weather, geographical environment, historical lightning frequency, etc., and the intensity and frequency of lightning current have high dynamicity and unpredictability. The existing arrester system lacks the ability to dynamically adapt, and usually uses a fixed protection threshold, which cannot be adjusted according to the changes in the actual environment. A single fixed threshold is particularly limited in areas with frequent thunderstorms or large changes in weather conditions, and cannot effectively protect the equipment when lightning strikes.

[0009] After the lightning strike disappears, the existing lightning protection device mostly adopts manual or non-intelligent reset mode in reset control, lacks intelligent reset mechanism such as residual current fluctuation detection, and is easy to cause the problem that the protection system cannot quickly respond when lightning strikes recur and the protection fails. At the same time, the current fluctuation in the reset process also lacks necessary monitoring means, and the reset operation cannot be flexibly adjusted according to the residual current condition, thereby increasing the risk of misoperation. SUMMARY

[0010] In view of the above problems, the present application is proposed.

[0011] Therefore, the technical problem solved by the present application is that the existing lightning protection method is prone to uneven shunt under high lightning current impact, causing overload failure of part of the lightning arresters; the fixed threshold value mode leads to poor dynamic response and cannot adapt to environmental changes; the reset control lacks intelligent monitoring, and the reset process is easy to be affected by residual current fluctuation, and there is a risk of misoperation. These problems affect the reliability and adaptability of the lightning protection system.

[0012] To solve the above technical problems, the present application provides the following technical scheme: a triangular combined shunt lightning protection method, comprising:

[0013] The monitoring module acquires lightning current intensity data in the power distribution line in real time;

[0014] The acquired lightning current data is transmitted to the data processing module to determine whether the lightning current intensity exceeds the preset safety threshold; if it exceeds, a shunt start signal is sent;

[0015] The shunt control module divides one cycle into multiple sub-periods after receiving the start signal, and activates the three lightning arrester groups arranged in a triangle in turn, and sequentially shunts the lightning current to each lightning arrester group; each lightning arrester group is independently turned on in its own sub-period to realize triangular combined shunt;

[0016] In each sub-period, the shunt intensity control module weakens the lightning current according to the set weakening ratio, and introduces the shunted current into the ground after weakening to the target ratio;

[0017] The monitoring module monitors the lightning current intensity in real time, and if the lightning current intensity returns to the normal range, the reset module automatically closes the shunt control module and the shunt intensity control module, and resets the three lightning arrester groups to standby state.

[0018] As a preferred scheme of the triangular combined shunt lightning protection method, the current sensor is arranged to detect the current fluctuation in the power distribution line in real time and generate an analog voltage signal proportional to the lightning current intensity;

[0019] The analog voltage signal output by the current sensor is converted into a digital signal by an analog-to-digital converter;

[0020] The temporarily stored digital signal is transmitted to a low-pass filter circuit to obtain a smooth lightning current intensity digital signal.

[0021] As a preferred scheme of the triangular combined shunt lightning protection method, the determination of whether the lightning current intensity exceeds the preset safety threshold value comprises collecting real-time meteorological conditions of a meteorological system, including thunderstorm intensity, wind speed, humidity and lightning strike frequency, and generating a meteorological influence coefficient according to the conditions;

[0022] The historical lightning current data under similar weather conditions are extracted, and the historical influence coefficient is calculated according to the peak value of the historical lightning current;

[0023] The safety threshold value is determined based on the meteorological influence coefficient and the historical influence coefficient;

[0024] The filtered lightning current intensity data are compared with the safety threshold value, and if it is detected that the lightning current intensity of a sampling point exceeds the threshold value, a shunt starting signal is sent out.

[0025] As a preferred scheme of the triangular combined shunt lightning protection method, the realization of the triangular combined shunt comprises dividing a lightning current shunt period of 1 second into three sub-periods;

[0026] The conduction time of each group of lightning arresters is set according to the rated carrying current;

[0027] After the shunt control module receives the starting signal, the conduction logic circuit of the first group of lightning arresters is activated, and when the conduction time ends, the second group of lightning arresters is automatically switched to, and the third group of lightning arresters is activated in turn.

[0028] As a preferred scheme of the triangular combined shunt lightning protection method, the weakening of the lightning current according to the set weakening ratio comprises adjusting the shunt ratio in real time according to the current monitoring results of each group of lightning arresters, and shunting 2 / 3 of the lightning current to the lightning arrester group.

[0029] As a preferred scheme of the triangular combined shunt lightning protection method, the real-time monitoring of the lightning current intensity by the monitoring module comprises continuously sampling the lightning current intensity by the monitoring module, and when the sampling results of the lightning current intensity are lower than the dynamic safety threshold value for 5 times in succession, it is determined that the lightning current intensity returns to the normal range, and a lightning arrester reset process is triggered;

[0030] The shunt control module sequentially closes the conduction logic of the first, second and third groups of lightning arresters in the order of the lightning arrester group that is turned on first being reset first, and disconnects the control circuit thereof, thereby completing the sequential reset of the three groups of lightning arresters.

[0031] As a preferred scheme of the triangular combined shunt lightning protection method, in the lightning arrester reset process, the residual current monitoring module detects the current fluctuation in real time.

[0032] If the detected residual current fluctuation exceeds the preset safety threshold, it is determined that there is a risk of lightning current recurrence, and the current reset operation is temporarily delayed.

[0033] Another object of the present application is to provide a triangular combined shunt lightning protection system, which can solve the problems of overload risk, protection failure, blind shunt and reset misoperation in the existing lightning protection system by constructing a triangular combined shunt lightning protection system.

[0034] To solve the above technical problems, the present application provides the following technical scheme: a triangular combined shunt lightning protection system, comprising a monitoring module, a data processing module, a shunt lightning arrester module, a shunt control module, a shunt intensity control module and a reset module; the monitoring module is used to collect real-time lightning current intensity data of the distribution line and transmit the data to the data processing module; the data processing module is used to receive the lightning current data collected by the monitoring module and determine whether the current intensity exceeds the set safety threshold; if it exceeds, a start signal is sent; the shunt lightning arrester module is arranged in a triangular shape and comprises three lightning arrester groups arranged in an equilateral triangle structure, each lightning arrester group containing at least one lightning arrester; the three lightning arrester groups form a triangular combined structure to realize shunt of lightning current; the shunt control module activates the three lightning arrester groups arranged in a triangular shape in sequence after receiving the start signal, and shunts the lightning current to each lightning arrester group in time, completing the turn-by-turn parallel conduction of the three lightning arrester groups in a cycle; the shunt intensity control module is connected with the shunt control module, weakens the lightning current according to the set shunt intensity ratio, controls the intensity of the shunted current, and leads the remaining current into the ground after weakening to the predetermined ratio; the reset module is used to automatically close the shunt control module and the shunt intensity control module after the lightning current intensity returns to the normal range, and reset the three lightning arrester groups to standby state for next lightning current processing.

[0035] A computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the triangular combined shunt lightning protection method as described above when executing the computer program.

[0036] A computer readable storage medium has a computer program stored thereon, and the computer program is executed by a processor to implement the steps of the triangular combined shunt lightning protection method as described above.

[0037] The beneficial effects of this invention are as follows: The triangular combined lightning protection method provided by this invention effectively and evenly distributes lightning current through a triangular arrangement of surge arresters and a rotating conduction mechanism, preventing overload of a single surge arrester and improving the system's load-bearing capacity. By dynamically generating thresholds and combining real-time meteorological and historical lightning data, the system automatically adapts to different environmental changes, avoiding protection failure. The shunt control module automatically adjusts the shunt ratio, diverting 2 / 3 of the weakened current to the surge arrester group and diverting the remainder to the ground, optimizing load distribution. Intelligent reset is achieved after the lightning current returns to normal, with delayed reset via residual current detection to prevent malfunctions caused by recurring lightning strikes. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 The above is an overall flowchart of a triangular combination lightning protection method provided in one embodiment of the present invention.

[0040] Figure 2 The diagram shows the overall structure of a triangular combined lightning protection system according to the second embodiment of the present invention. Detailed Implementation

[0041] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0042] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0043] Example 1

[0044] Reference Figure 1 As an embodiment of the present invention, a triangular combination lightning protection method is provided, comprising:

[0045] S1: Real-time data collection of lightning current intensity in power distribution lines via monitoring module;

[0046] S1.1: Install high-precision current sensors at key nodes of the power distribution line. These sensors detect current fluctuations in the power distribution line in real time and generate an analog voltage signal proportional to the lightning current intensity.

[0047] S1.2: The analog voltage signal output by the current sensor is converted into a digital signal by an analog-to-digital converter (ADC). The sampling frequency of the ADC is set to 1000Hz to ensure timely response to high-frequency changes in lightning current. The sampling results are temporarily stored in a buffer for subsequent processing.

[0048] S1.3: The temporarily stored digital signal is transmitted to a low-pass filter circuit. The cutoff frequency of this filter circuit is set to 100Hz. Signals below 100Hz pass through, filtering out transient interference and electromagnetic noise, and obtaining a stable digital signal of lightning current intensity, which is suitable for subsequent analysis and processing.

[0049] S2: The collected lightning current data is transmitted to the data processing module to determine whether the lightning current intensity exceeds the preset safety threshold; if it does, a shunt start signal is issued.

[0050] S2.1: Collect real-time meteorological conditions from the meteorological system, including thunderstorm intensity, wind speed, humidity, and lightning frequency, and generate a meteorological influence coefficient based on these conditions. Meteorological Influence Coefficient F w The settings are based on the thunderstorm intensity as follows:

[0051] No thunderstorms: F w =1.0

[0052] Light thunderstorm: F w =1.2

[0053] Moderate thunderstorm: F w =1.5

[0054] Severe thunderstorm: F w =2.0

[0055] S2.2: Extract historical lightning current data under similar weather conditions from the storage module, and calculate the historical influence coefficient F based on the peak value of the historical lightning current. h The settings are as follows:

[0056] Peak value <1000A:F h =0.8

[0057] Peak value 1000-2000A:F h =1.0

[0058] Peak value > 2000A:F h =1.2

[0059] S2.3: Dynamic security threshold Td The calculation formula is:

[0060] T d =T b ×F w ×F h

[0061] Among them, T d T represents the dynamic safety threshold (unit: amperes, A). b This represents the base threshold (in amperes, A), typically a standard current value, such as 1000A, F. w F represents the meteorological impact coefficient, set according to current meteorological conditions. h This represents the historical impact coefficient, which is set based on historical peak lightning current values.

[0062] S2.4: Threshold Detection

[0063] The filtered lightning current intensity data is compared with the dynamic safety threshold T in the register. d The process involves successive comparisons. If the lightning current intensity at a certain sampling point exceeds the dynamic threshold, a shunt start signal is immediately generated and transmitted to the shunt control module via the signal bus.

[0064] S3: After receiving the start signal, the current shunt control module divides one cycle into multiple sub-cycles and activates the three surge arrester groups arranged in a triangle in sequence, shunting the lightning current to each surge arrester group in sequence. Each surge arrester group conducts independently in its own sub-cycle, realizing the triangular combination current shunt.

[0065] S3.1: Periodic Division

[0066] The 1-second lightning current shunt cycle is divided into three sub-cycles, each with a length of 333 milliseconds, to control the conduction of each group of surge arresters within their respective sub-cycles.

[0067] S3.2: On-time setting

[0068] The conduction time of each group of surge arresters Based on its rated carrying current, the specific formula is as follows:

[0069]

[0070] Among them, T g Indicates the conduction time of each group of surge arresters (unit: milliseconds, ms), I r This indicates the rated carrying current of the surge arrester assembly (unit: amperes, A), for example, 600A, I m T represents the real-time lightning current intensity under dynamic monitoring (unit: ampere, A). sThis indicates the total time of the sub-cycle (in milliseconds, ms), for example, 333 milliseconds.

[0071] Assuming the rated current of the surge arrester is 600A, if the monitored lightning current intensity is 1200A, then the conduction time is approximately 600A / 1200A × 333 milliseconds ≈ 167 milliseconds. After the conduction time is set in the shunt control module, the conduction of each group of surge arresters is controlled by hardware logic gates.

[0072] S3.3: Activation of surge arrester group during sub-cycle

[0073] After the shunt control module receives the start signal, it first activates the conduction logic circuit of the first group of surge arresters. When the conduction time ends, it automatically switches to the second group of surge arresters. Finally, it activates the third group of surge arresters in sequence, so as to realize the sequential conduction of the three groups of surge arresters and ensure that the lightning current is evenly shunted in each sub-cycle.

[0074] S4: In each sub-cycle, the shunt intensity control module weakens the lightning current according to the set weakening ratio, and then guides the shunt current to the ground after weakening it to the target ratio.

[0075] S4.1: Based on the current monitoring results of each group of surge arresters, adjust the shunt ratio in real time to divert 2 / 3 of the lightning current to the surge arrester group. The formula for adjusting the shunt strength is as follows:

[0076]

[0077] Among them, I f I represents the intensity of the lightning current after shunting (unit: ampere, A). m This represents the real-time monitored lightning current intensity (unit: ampere, A).

[0078] S4.2: The shunt control module uses a programmable logic controller (PLC) to set the shunt ratio of each group of surge arresters to 2 / 3, and every 50 milliseconds, it monitors the current value I... m Recalibrate the shunt ratio to ensure that the shunt load of each group of surge arresters is relatively uniform.

[0079] S4.3: The reduced 1 / 3 current is conducted to the ground through the grounding line. The design impedance of the grounding circuit is less than 1Ω to ensure that the residual current is safely discharged.

[0080] S5: The monitoring module monitors the lightning current intensity in real time. If the lightning current intensity returns to the normal range, the reset module automatically shuts down the shunt control module and the shunt intensity control module, and resets the three sets of surge arresters to the standby state.

[0081] S5.1: Real-time monitoring of lightning current intensity recovery

[0082] The monitoring module continuously samples the lightning current intensity. When the lightning current intensity is lower than the dynamic safety threshold T for 5 consecutive samplings, the monitoring module will take action. d When the lightning current intensity is determined to have returned to the normal range, the surge arrester reset process is triggered.

[0083] S5.2: Sequential reset of surge arrester assembly

[0084] The shunt control module resets the surge arresters in the order that the first group of surge arresters is turned on, then turns off the conduction logic of the first, second, and third groups of surge arresters in sequence, and disconnects their control circuits, thus completing the sequential reset of the three groups of surge arresters.

[0085] S5.3: Residual Current Fluctuation Detection

[0086] During the surge arrester reset process, the residual current monitoring module detects current fluctuations in real time. If the detected residual current fluctuation ΔI exceeds the preset safety threshold I... s If the current is determined to be at risk of lightning current recurrence, the current reset operation will be temporarily delayed.

[0087] ΔI≤I s

[0088] Where ΔI represents the detected value of residual current fluctuation (unit: amperes, A), I s This indicates the safety fluctuation threshold (unit: ampere, A), for example, 50A.

[0089] S5.4: Delayed Reset and Re-detection

[0090] If the fluctuation value exceeds the limit, the residual current fluctuation value will be rechecked every 100 milliseconds until the fluctuation returns to below 50A before the reset operation can continue. If the fluctuation remains unstable, a delay mode will be entered to avoid reset misoperation caused by lightning strike recurrence.

[0091] Example 2

[0092] Reference Figure 2 As an embodiment of the present invention, a triangular combined lightning protection system is provided, comprising:

[0093] The system includes a monitoring module 100, a data processing module 200, a shunt arrester module 300, a shunt control module 400, a shunt intensity control module 500, and a reset module 600.

[0094] The monitoring module 100 is used to collect real-time lightning current intensity data of the power distribution line and transmit the data to the data processing module;

[0095] The data processing module 200 is used to receive lightning current data collected by the monitoring module and determine whether the current intensity exceeds the set safety threshold; if it does, a start signal is issued.

[0096] The shunt arrester module 300 is arranged in a triangle, including three arrester groups arranged in an equilateral triangle structure. Each arrester group contains at least one arrester. The three arrester groups form a triangular combination structure to achieve the shunting of lightning current.

[0097] After receiving the start signal, the current shunt control module 400 sequentially activates the three surge arrester groups arranged in a triangle, and conducts the lightning current to each surge arrester group in a time-sharing manner, completing the alternating parallel conduction of the three surge arresters in one cycle;

[0098] The shunt intensity control module 500 is connected to the shunt control module, which weakens the lightning current according to the set shunt intensity ratio and controls the current intensity after shunt. After weakening to a predetermined ratio, the remaining current is introduced into the ground.

[0099] The reset module 600 is used to automatically shut down the shunt control module and the shunt intensity control module after the lightning current intensity returns to the normal range, and reset the three sets of surge arresters to the standby state for the next lightning current handling.

[0100] Example 3

[0101] One embodiment of the present invention differs from the previous two embodiments in that:

[0102] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a 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 methods described in the various embodiments of the present invention. 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.

[0103] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0104] More specific examples of computer-readable media (a non-exhaustive list) include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0105] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0106] Example 4 is an embodiment of the present invention, which provides a triangular combination lightning protection method. In order to verify the beneficial effects of the present invention, a simulation experiment is conducted for scientific demonstration.

[0107] By simulating lightning current impact, the performance differences between the system of this invention and the traditional lightning protection system in terms of lightning current shunting uniformity, dynamic response, load optimization, and reset protection are compared.

[0108] The shunt lightning protection system of this invention adopts technologies such as triangular arrangement of surge arrester groups, dynamic threshold generation, intelligent shunt ratio control, and residual current detection and reset.

[0109] Traditional lightning protection systems use parallel surge arresters triggered by a fixed threshold, which do not have dynamic control and intelligent current diversion functions.

[0110] The simulated lightning current intensities were 1000A, 2000A, and 3000A (simulating lightning strikes of different intensities); the reset condition was automatic reset when the current intensity dropped below 200A; the test cycle was 5 tests for each lightning current intensity to obtain average data.

[0111] The lightning current impulse intensity was set, and lightning current impulse tests of 1000A, 2000A, and 3000A were conducted on both systems respectively. The experimental results are shown in Table 1.

[0112] Table 1 Comparison of Experimental Results

[0113]

[0114]

[0115] This invention utilizes a triangular arrangement of surge arresters and a staggered conduction mechanism to ensure uniform distribution of lightning current among different surge arrester groups. In contrast, traditional methods using parallel surge arresters are prone to uneven current distribution under high-current surges, leading to overload of some arrester groups. The triangular combination and intelligent current distribution technology ensures load balance, significantly reduces the current difference between different groups of surge arresters, and thus improves the overall current distribution uniformity of the method.

[0116] By employing a dynamic threshold generation mechanism, the method can set appropriate response thresholds based on meteorological conditions and historical data, thereby improving its response speed under lightning current impacts of varying intensities. Traditional methods, on the other hand, use fixed thresholds that cannot be adjusted in real time. When the lightning current intensity is high, the hysteresis of the threshold significantly affects the method's response speed. The dynamic response function of this invention avoids response delays caused by unreasonable thresholds, thus providing faster lightning current shunting protection.

[0117] By employing intelligent current shunting proportional control, two-thirds of the lightning current load is rationally distributed to the surge arrester group, and the remaining current is conducted to the ground after attenuation treatment, effectively controlling the load intensity of a single surge arrester group. Traditional methods lack intelligent current shunting control, causing parallel surge arresters to exceed their rated load-bearing limits under high current surges. The intelligent current shunting control of this invention significantly improves the load distribution efficiency of the surge arrester group, enabling the method to maintain stability under high lightning current intensities.

[0118] The residual current detection and delayed reset mechanism can intelligently identify the presence of residual current fluctuations during the reset process, and delay the reset when the fluctuation exceeds the limit, reducing the probability of misoperation caused by lightning recurrence. Traditional methods lack residual current detection and cannot identify lightning fluctuations in the environment during reset, easily resetting prematurely before the lightning strike has completely subsided. The intelligent reset technology of this invention reduces the false reset rate and improves the reset accuracy of the method in high-risk environments.

[0119] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A triangular combination lightning protection method, characterized in that, include: The monitoring module collects real-time data on lightning current intensity in power distribution lines. The collected lightning current data is transmitted to the data processing module to determine whether the lightning current intensity exceeds the preset safety threshold. If the current exceeds the limit, a diversion start signal will be issued; After receiving the start signal, the current shunt control module divides one cycle into multiple sub-cycles and activates the three surge arrester groups arranged in a triangle in sequence, shunting the lightning current to each surge arrester group in order. Each surge arrester group conducts independently in its own sub-cycle, realizing the triangular combination current shunt. Within each sub-cycle, the shunt intensity control module weakens the lightning current according to the set weakening ratio, and then guides the shunt current to the ground after weakening it to the target ratio. The monitoring module monitors the lightning current intensity in real time. If the lightning current intensity returns to the normal range, the reset module automatically shuts down the shunt control module and the shunt intensity control module, and resets the three sets of surge arresters to standby state.

2. The triangular combined lightning protection method as described in claim 1, characterized in that: The method includes arranging current sensors to detect current fluctuations in the power distribution line in real time and generating an analog voltage signal proportional to the lightning current intensity. The analog voltage signal output by the current sensor is converted into a digital signal using an analog-to-digital converter; The temporarily stored digital signal is transmitted to a low-pass filter circuit to obtain a stable digital signal of lightning current intensity.

3. The triangular combined lightning protection method as described in claim 2, characterized in that: The determination of whether the lightning current intensity exceeds the preset safety threshold includes collecting real-time meteorological conditions from the meteorological system, including thunderstorm intensity, wind speed, humidity, and lightning frequency, and generating a meteorological influence coefficient based on the conditions. Extract historical lightning current data under similar weather conditions, and calculate the historical impact coefficient based on the peak value of historical lightning current; Safety thresholds are determined based on meteorological impact coefficients and historical impact coefficients; The filtered lightning current intensity data is compared with the safety threshold. If the lightning current intensity at a certain sampling point exceeds the threshold, a shunt start signal is issued.

4. The triangular combined lightning protection method as described in claim 3, characterized in that: The implementation of the triangular combination current shunting includes dividing the 1-second lightning current shunting cycle into three sub-cycles; The conduction time of each group of surge arresters is set according to the rated carrying current. After the shunt control module receives the start signal, it activates the conduction logic circuit of the first group of surge arresters. When the conduction time ends, it automatically switches to the second group of surge arresters and then activates the third group of surge arresters in sequence.

5. The triangular combined lightning protection method as described in claim 4, characterized in that: The reduction of lightning current according to the set reduction ratio includes adjusting the current shunting ratio in real time based on the current monitoring results of each group of surge arresters, and diverting 2 / 3 of the lightning current to the surge arrester group.

6. The triangular combined lightning protection method as described in claim 5, characterized in that: The monitoring module monitors the lightning current intensity in real time, including continuous sampling of the lightning current intensity. When the lightning current intensity is lower than the dynamic safety threshold for 5 consecutive samplings, it is determined that the lightning current intensity has returned to the normal range, triggering the arrester reset process. The shunt control module resets the surge arresters in the order that the first group of surge arresters is turned on, then turns off the conduction logic of the first, second, and third groups of surge arresters in sequence, and disconnects their control circuits, thus completing the sequential reset of the three groups of surge arresters.

7. The triangular combined lightning protection method as described in claim 6, characterized in that: During the arrester reset process, the residual current monitoring module detects current fluctuations in real time; If residual current fluctuations are detected to exceed a preset safety threshold, it is determined that there is a risk of lightning current recurrence, and the current reset operation is temporarily delayed.

8. A system employing the triangular combined lightning protection method as described in any one of claims 1 to 7, characterized in that, include: The system includes a monitoring module (100), a data processing module (200), a shunt arrester module (300), a shunt control module (400), a shunt intensity control module (500), and a reset module (600). The monitoring module (100) is used to collect real-time lightning current intensity data of the power distribution line and transmit the data to the data processing module; The data processing module (200) is used to receive lightning current data collected by the monitoring module and determine whether the current intensity exceeds the set safety threshold. If the limit is exceeded, a start signal will be issued; The shunt arrester module (300) is arranged in a triangle, including three arrester groups arranged in an equilateral triangle structure. Each arrester group contains at least one arrester. The three arrester groups form a triangular combination structure to achieve the shunting of lightning current. After receiving the start signal, the current shunt control module (400) sequentially activates the three surge arrester groups arranged in a triangle, and conducts the lightning current to each surge arrester group in a time-sharing manner, completing the alternating parallel conduction of the three surge arresters in one cycle; The shunt intensity control module (500) is connected to the shunt control module, weakens the lightning current according to the set shunt intensity ratio, controls the current intensity after shunt, and guides the remaining current to the ground after weakening to the predetermined ratio. The reset module (600) is used to automatically shut down the shunt control module and the shunt intensity control module after the lightning current intensity returns to the normal range, and reset the three sets of surge arresters to the standby state for the next lightning current handling.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the triangular combination lightning protection method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the triangular combination lightning protection method as described in any one of claims 1 to 7.

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