Safety protection method, device and equipment of distribution line and medium

Abstract

The embodiment of the invention discloses a safety protection method and device for a distribution line, equipment and a medium. The method comprises the following steps: acquiring distribution line parameters and candidate lightning stroke data, and constructing a line simulation model according to the distribution line parameters; determining an initial lightning stroke simulation model according to the candidate lightning stroke data and a preset lightning stroke simulation waveform; determining a candidate lightning stroke simulation model according to the initial lightning stroke simulation model, the distribution line parameters and the target lightning stroke data; according to each candidate lightning stroke simulation model and the line simulation model, determining a candidate lightning current threshold, and according to the candidate lightning current threshold and the target lightning stroke data, determining a candidate current threshold probability under the corresponding candidate lightning stroke type; and according to each candidate current threshold probability, a preset lightning stroke event proportion and the distribution line parameters, determining a lightning arrester abnormal probability under the target return stroke frequency, and performing safety protection on the distribution line in the to-be-processed area according to the lightning arrester abnormal probability. And the safety of the distribution line is improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of power systems, and particularly to a safety protection method, device, equipment and medium for distribution lines. Background Art

[0002] Distribution lines are one of the crucial infrastructure in modern society. Lightning strike faults are common problems in distribution lines, and the faults may lead to consequences such as line damage and user power outage. Due to the wide distribution and complex structure of distribution lines and their relatively low insulation level, it is crucial to improve the safety of distribution lines. Summary of the Invention

[0003] The present invention provides a safety protection method, device, equipment and medium for distribution lines to improve the safety of distribution lines.

[0004] According to one aspect of the present invention, there is provided a safety protection method for distribution lines, including:

[0005] Obtain the distribution line parameters and candidate lightning strike data of the distribution lines in the area to be processed, and construct a line simulation model according to the distribution line parameters;

[0006] Determine the model simulation data according to the candidate lightning strike data, and determine an initial lightning strike simulation model according to the model simulation data and a preset lightning strike simulation waveform;

[0007] Determine candidate lightning strike simulation models corresponding to each candidate lightning strike type according to the initial lightning strike simulation model, the distribution line parameters and target lightning strike data; wherein, the candidate lightning strike types include direct lightning strike type, induced lightning strike type and counterattack lightning strike type; the target lightning strike data is screened from the candidate lightning strike data based on the target return stroke frequency in the model simulation data;

[0008] Determine candidate lightning current thresholds under the corresponding candidate lightning strike types according to each candidate lightning strike simulation model and the line simulation model, and determine candidate current threshold probabilities under the corresponding candidate lightning strike types according to the candidate lightning current thresholds and the target lightning strike data; wherein, the candidate current threshold probabilities include direct current threshold probability, induced current threshold probability and counterattack current threshold probability;

[0009] Determine the abnormal probability of the lightning arrester under the target return stroke frequency according to each candidate current threshold probability, a preset lightning strike event proportion and the distribution line parameters, and perform safety protection on the distribution lines in the area to be processed according to the abnormal probability of the lightning arrester.

[0010] According to another aspect of the present invention, there is provided a safety protection device for distribution lines, including:

[0011] A line simulation model construction module, configured to obtain distribution line parameters and candidate lightning strike data of a distribution line within a to-be-processed area, and construct a line simulation model according to the distribution line parameters;

[0012] An initial lightning strike model construction module, configured to determine model simulation data according to the candidate lightning strike data, and determine an initial lightning strike simulation model according to the model simulation data and a preset lightning strike simulation waveform;

[0013] A candidate lightning strike model determination module, configured to determine a candidate lightning strike simulation model corresponding to each candidate lightning strike type according to the initial lightning strike simulation model, the distribution line parameters, and target lightning strike data; wherein, the candidate lightning strike types include a direct lightning strike type, an induced lightning strike type, and a counterattack lightning strike type; the target lightning strike data is screened from the candidate lightning strike data based on a target return stroke frequency in the model simulation data;

[0014] A lightning current threshold probability determination module, configured to determine a candidate lightning current threshold under a corresponding candidate lightning strike type according to each candidate lightning strike simulation model and the line simulation model, and determine a candidate current threshold probability under the corresponding candidate lightning strike type according to the candidate lightning current threshold and the target lightning strike data; wherein, the candidate current threshold probabilities include a direct lightning current threshold probability, an induced lightning current threshold probability, and a counterattack lightning current threshold probability;

[0015] A line protection module, configured to determine an abnormal probability of a lightning arrester under the target return stroke frequency according to each candidate current threshold probability, a preset lightning strike event proportion, and the distribution line parameters, and perform safety protection on the distribution line within the to-be-processed area according to the abnormal probability of the lightning arrester.

[0016] According to another aspect of the present invention, there is provided an electronic device, including:

[0017] One or more processors;

[0018] A memory, configured to store one or more programs;

[0019] When the one or more programs are executed by the one or more processors, the one or more processors are enabled to execute any one of the safety protection methods for a distribution line provided by an embodiment of the present invention.

[0020] According to another aspect of the present invention, there is provided a computer-readable storage medium, where the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement any one of the safety protection methods for a distribution line provided by an embodiment of the present invention when executed.

[0021] An embodiment of the present invention provides a safety protection scheme for a distribution line. By obtaining the distribution line parameters and candidate lightning strike data of the distribution line in the area to be processed, and constructing a line simulation model according to the distribution line parameters; determining the model simulation data according to the candidate lightning strike data, and determining the initial lightning strike simulation model according to the model simulation data and the preset lightning strike simulation waveform; determining the candidate lightning strike simulation models corresponding to each candidate lightning strike type according to the initial lightning strike simulation model, the distribution line parameters and the target lightning strike data; wherein, the candidate lightning strike types include direct lightning strike type, induced lightning strike type and counterattack lightning strike type; the target lightning strike data is screened from the candidate lightning strike data based on the target return stroke frequency in the model simulation data; determining the candidate lightning current thresholds corresponding to the respective candidate lightning strike types according to each candidate lightning strike simulation model and the line simulation model, and determining the candidate current threshold probabilities corresponding to the respective candidate lightning strike types according to the candidate lightning current thresholds and the target lightning strike data; wherein, the candidate current threshold probabilities include direct current threshold probability, induced current threshold probability and counterattack current threshold probability; determining the abnormal probability of the lightning arrester at the target return stroke frequency according to each candidate current threshold probability, the preset lightning strike event ratio and the distribution line parameters, and performing safety protection on the distribution line in the area to be processed according to the abnormal probability of the lightning arrester. In the above solution, by constructing a line simulation model and candidate lightning strike simulation models under different candidate lightning strike types, the candidate lightning current thresholds under each candidate lightning strike type are determined. According to the candidate lightning current thresholds and the target lightning strike data, the candidate current threshold probabilities corresponding to the respective candidate lightning strike types are determined. Furthermore, according to the candidate current threshold probabilities, the abnormal probability of the lightning arrester is determined, realizing the determination of the failure probability of the lightning arrester under multiple lightning strikes, improving the accuracy of the determined abnormal probability of the lightning arrester, and further improving the accuracy of the safety protection of the distribution line in the area to be processed based on the abnormal probability of the lightning arrester, that is, improving the safety of the distribution line in the area to be processed.

[0022] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 is a flowchart of a safety protection method for a distribution line provided in Embodiment 1 of the present invention;

[0025] Figure 2It is a flowchart of a safety protection method for a distribution line provided in the second embodiment of the present invention;

[0026] Figure 3 It is a schematic structural diagram of a safety protection device for a distribution line provided in the fourth embodiment of the present invention;

[0027] Figure 4 It is a schematic structural diagram of an electronic device for implementing a safety protection method for a distribution line provided in the fifth embodiment of the present invention. Detailed implementation manners

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that, for the sake of description, only the parts related to the present invention are shown in the drawings, rather than all the structures.

[0029] Embodiment 1

[0030] Figure 1 It is a flowchart of a safety protection method for a distribution line provided in the first embodiment of the present invention. This embodiment is applicable to the situation of lightning protection for a distribution line. This method can be executed by a safety protection device for a distribution line. The device can be implemented in a software and / or hardware manner and can be configured in an electronic device that undertakes the safety protection function of the distribution line.

[0031] Refer to Figure 1 The safety protection method for a distribution line shown below includes:

[0032] S110. Obtain the distribution line parameters and candidate lightning strike data of the distribution line in the area to be processed, and construct a line simulation model according to the distribution line parameters.

[0033] Among them, the area to be processed refers to the area where safety protection of the distribution line needs to be carried out. The present invention does not limit the type of the distribution line in any way, and it can be set by those skilled in the art according to experience or needs. For example, the distribution line can be a 10 kV distribution line.

[0034] Among them, the distribution line parameters refer to the relevant parameters of the distribution line. Exemplarily, the distribution line parameters can include line parameters, tower parameters, and arrester parameters. The line parameters refer to the parameters associated with the conductor in the distribution line. The tower parameters refer to the parameters associated with the tower in the distribution line. The arrester parameters refer to the parameters associated with the arrester in the distribution line.

[0035] Exemplarily, the line parameters may include the total line length, conductor type, span, sag, ground wire distance, height and spacing of each phase conductor, etc. Among them, the total line length refers to the total length of the distribution line within the area to be processed. The conductor type refers to the conductor model. The span refers to the distance between two poles, such as 50m. The sag refers to the vertical distance from the lowest point where the conductor sags between two poles to the midpoint of the connection line between the two poles. The ground wire distance refers to the distance between two ground wires. The height of each phase conductor refers to the height between each phase conductor and the ground respectively. The spacing between each phase conductor refers to the distance between each phase conductor.

[0036] Exemplarily, the pole parameters may include the structure type, pole height, grounding resistance, insulator type and length, etc. Among them, the structure type refers to the type of poles in the distribution line. The pole height refers to the height of the poles in the distribution line. The grounding resistance refers to the resistance between the pole and the ground. The insulator type refers to the type of insulators in the distribution line. The insulator length refers to the length of the insulator.

[0037] Exemplarily, the arrester parameters may include the rated voltage, lightning impulse residual voltage, volt-ampere characteristic and energy threshold, etc. Among them, since the lightning impulse is a pulsed current, the voltage generated across the arrester by the pulsed current is the lightning impulse residual voltage. The energy threshold refers to the maximum failure energy that the arrester can withstand.

[0038] Among them, the candidate lightning strike data refers to the data when the distribution line in the area to be processed was struck by lightning in the past. The line simulation model can be used to simulate the distribution line in the area to be processed.

[0039] For example, taking a 10KV distribution line as an example, a corresponding 10kV distribution line model (i.e., the line simulation model) is established in the electromagnetic transient simulation software. Specifically: the conductors of the overhead line are built using a frequency-dependent model; the poles are built using a single wave impedance model, and the scaled pole dimensions are input; the pole grounding resistance uses a resistance model; the insulator selects the leader development method as the flashover criterion, and the flashover process of the insulator string is simulated by a circuit breaker, and whether the circuit breaker trips or not is determined by the voltage across the insulator and the flashover criterion.

[0040] S120. Determine the model simulation data according to the candidate lightning strike data, and determine the initial lightning strike simulation model according to the model simulation data and the preset lightning strike simulation waveform.

[0041] Among them, the model simulation data can be used for building the simulation data of the initial lightning strike simulation model. The preset lightning strike simulation waveform refers to the lightning strike waveform set in advance. Exemplarily, the preset lightning strike simulation waveform can include the first return stroke waveform and the subsequent return stroke waveform. The first return stroke waveform refers to the lightning current waveform generated during the first lightning strike in a lightning activity. The subsequent return stroke waveform refers to the lightning current waveform generated during the subsequent lightning strikes after the first lightning strike in a lightning activity. For example, the first return stroke waveform can be the first return stroke 1 / 200 μs waveform, and the subsequent return stroke waveform can be the subsequent return stroke 0.25 / 100 μs waveform.

[0042] Exemplarily, for any set of sub-data in the model simulation data, if this set of sub-data is the data of the first lightning strike, then this set of sub-data corresponds to the first return stroke waveform; if this set of sub-data is the data of the subsequent lightning strikes, then this set of sub-data corresponds to the subsequent return stroke waveform.

[0043] Among them, the initial lightning strike simulation model refers to a lightning current source model with a basic architecture.

[0044] In an alternative embodiment, if the candidate lightning strike data includes a candidate return stroke frequency, a candidate return stroke interval, and a candidate lightning current amplitude, then according to the candidate lightning strike data, the model simulation data is determined, including: determining the frequency proportion of the candidate return stroke frequency, and according to the frequency proportion, determining the target return stroke frequency from the candidate return stroke frequencies; determining the average interval of the candidate return stroke intervals, and according to the average interval, determining the target return stroke interval; determining the target lightning current amplitude according to the candidate lightning current amplitude; generating the model simulation data including the target return stroke frequency, the target return stroke interval, and the target lightning current amplitude.

[0045] Among them, the candidate return stroke frequency refers to the number of lightning return strokes per unit time. For example, if the candidate return stroke frequency is 2, it represents double lightning strikes; if the candidate return stroke frequency is 3, it represents triple lightning strikes; if the candidate return stroke frequency is 4, it represents quadruple lightning strikes.

[0046] Among them, the candidate return stroke interval refers to the time interval between the peak values of the current waveforms of two consecutive return strokes. The candidate lightning current amplitude refers to the lightning current amplitude generated during a lightning strike. Exemplarily, the candidate lightning current amplitude can include the first return stroke lightning current amplitude and the subsequent return stroke lightning current amplitude. The first return stroke lightning current amplitude refers to the lightning current amplitude during the first lightning strike. The subsequent return stroke lightning current amplitude refers to the lightning current amplitude during the subsequent lightning strikes.

[0047] Among them, the frequency proportion refers to the proportion of the number of different candidate return stroke frequencies in the total number of candidate return stroke frequencies. The target return stroke frequency refers to the candidate return stroke frequency with the largest frequency proportion. For example, if the candidate return stroke frequencies include 2, 3, 4, and 5, the frequency proportions of each candidate return stroke frequency are determined respectively. If the frequency proportion of the candidate return stroke frequency of 2 is the largest, then the target return stroke frequency is determined to be 2.

[0048] Among them, the interval average value refers to the average time interval between the peak values of the return stroke current waveforms for two consecutive times. Exemplarily, first, based on the candidate return stroke intervals belonging to the same multiple lightning strike, the average interval value of this multiple lightning strike is determined; then, based on the average interval values of each multiple lightning strike, the interval average value is determined.

[0049] Among them, the target return stroke interval refers to the return stroke interval determined based on the interval average value. Exemplarily, the target return stroke interval can be the interval average value, or the target return stroke interval can be a data relatively close to the interval average value. For example, if the interval average value is 0.098 s, the target return stroke interval can be 100 ms.

[0050] Among them, the target lightning current amplitude refers to the lightning current amplitude in the initial lightning strike simulation model. Exemplarily, in the embodiments of the present invention, the same first return stroke lightning current amplitude and subsequent return stroke lightning current amplitudes are set when building the initial lightning strike simulation model, and the magnitude of the lightning current amplitude can be based on the first return stroke lightning current amplitude.

[0051] Exemplarily, based on the lightning location system in the area to be processed, first, parameters such as the candidate return stroke frequency, candidate return stroke interval, first return stroke lightning current amplitude, and subsequent return stroke lightning current amplitude of multiple lightning strikes are statistically analyzed, and the typical ranges of the parameters are determined, the average values of the parameters are calculated, and finally the parameters required by the model (i.e., the model simulation data) are determined. Specifically: the typical range of the candidate return stroke frequency is 2 to 6 times, and the frequency proportion of different candidate return stroke frequencies is calculated; the typical range of the candidate return stroke interval is 0 to 0.2 s, and the average value is calculated to be 0.098 s; the parameters adopted in this example when establishing the line simulation model are: the target return stroke frequency is taken as 2 times, the target return stroke interval is taken as 100 ms, and the same lightning current amplitude is taken for the first return stroke and subsequent return strokes.

[0052] It can be understood that by determining the target return stroke frequency according to the frequency proportion of the candidate return stroke frequency, the subsequent screening of the target lightning strike data from the candidate lightning strike data based on the target return stroke frequency is realized, the lightning protection consideration for the multiple lightning strikes that appear more in the area to be processed is realized, and the data volume is reduced; at the same time, according to the interval average value, the target return stroke interval is determined, and the accuracy of the determined target return stroke interval is improved; and the model simulation data including the target return stroke frequency, target return stroke interval, and target lightning current amplitude is generated, the comprehensiveness of the model simulation data is improved, and further the accuracy of building the initial lightning strike simulation model based on the model simulation data is improved.

[0053] S130. According to the initial lightning strike simulation model, the distribution line parameters, and the target lightning strike data, determine the candidate lightning strike simulation models corresponding to each candidate lightning strike type.

[0054] Among them, the target lightning strike data refers to the candidate lightning strike data where the target return stroke frequency is located. Exemplarily, the target lightning strike data is screened from the candidate lightning strike data based on the target return stroke frequency in the model simulation data.

[0055] Among them, the candidate lightning strike type refers to the type of lightning strike. Exemplarily, the candidate lightning strike types include direct lightning strike type, induced lightning strike type, and counter lightning strike type. The direct lightning strike type can represent the situation where lightning directly hits the wire. The induced lightning strike type can represent the situation where lightning hits the ground or other objects and then induces an induced voltage on the wire. The counter lightning strike type can represent the situation where lightning hits the tower and then induces an induced voltage on the wire.

[0056] Among them, the candidate lightning strike simulation model can be used to simulate lightning strike phenomena, that is, the candidate lightning strike simulation model can be connected to the line simulation model through the wire to simulate the working conditions of the distribution line under lightning strikes. Exemplarily, the candidate lightning strike simulation model can include a direct lightning strike simulation model, an induced lightning strike simulation model, and a counter lightning strike simulation model.

[0057] Among them, the direct lightning strike simulation model can be used to simulate the working conditions of direct lightning strikes. The induced lightning strike simulation model can be used to simulate the working conditions of induced lightning strikes. The counter lightning strike simulation model can be used to simulate the working conditions of counter lightning strikes.

[0058] For example, the intervals between the return strokes of multiple lightning strikes are relatively long, about 100 ms. When subsequent return strokes occur, the insulation level of the line basically returns to normal. Therefore, the simulations of direct lightning strikes and induced lightning strikes under multiple lightning strikes can be regarded as the simulations of multiple single lightning strikes. Combining with the lightning current mathematical model in multiple lightning strikes (i.e., the initial lightning strike simulation model), an electromagnetic transient simulation analysis model of direct lightning strike, induced lightning strike, and counter lightning strike overvoltages for the corresponding 10 kV distribution line is established in the electromagnetic transient simulation software, that is, a direct lightning strike simulation model, an induced lightning strike simulation model, and a counter lightning strike simulation model are established.

[0059] In an alternative embodiment, according to the initial lightning strike simulation model, distribution line parameters, and target lightning strike data, determining the candidate lightning strike simulation models corresponding to each candidate lightning strike type includes: determining the candidate lightning strike simulation data under the candidate lightning strike type according to the distribution line parameters and target lightning strike data; determining the candidate lightning strike simulation model under the corresponding candidate lightning strike type according to the candidate lightning strike simulation data and the initial lightning strike simulation model.

[0060] Among them, the candidate lightning strike simulation data refers to the simulation data required for constructing a candidate lightning strike simulation model under a candidate lightning strike type. Exemplarily, the current lightning strike type is determined from the candidate lightning strike types. For the current lightning strike type, the current lightning strike simulation data under the current lightning strike type is determined according to the distribution line parameters and / or the target lightning strike data; according to the current lightning strike simulation data and the initial lightning strike simulation model, the current lightning strike simulation model under the current lightning strike type is determined.

[0061] Among them, the current lightning strike type refers to the candidate lightning strike type for constructing a candidate lightning strike simulation model at the current moment. The current lightning strike type can be one of the direct lightning strike type, the induced lightning strike type, and the backflashover lightning strike type. The current lightning strike simulation data refers to the simulation data corresponding to the current lightning strike type. The current lightning strike simulation model corresponds to the current lightning strike type, that is, the current lightning strike simulation model can be a direct lightning strike simulation model, an induced lightning strike simulation model, or a backflashover lightning strike simulation model.

[0062] Exemplarily, if the current lightning strike type is the direct lightning strike type, since the direct lightning strike can be equivalent to a lightning current source directly connected to the wire, a double-exponential wave model can be adopted. The current lightning strike simulation data under the direct lightning strike type can be determined by the following formula. At this time, the current lightning strike simulation data is the direct lightning current simulation data:

[0063] i(t) 直击 =kI m (e -at -e -bt );

[0064] Among them, i(t) 直击 represents the lightning current value that changes with time, that is, the direct lightning current simulation data; t represents time; k represents the amplitude calibration coefficient of the double-exponential wave, which can be determined by a preset lightning strike simulation waveform; I m represents the lightning current amplitude in the target lightning strike data; e represents the exponent; both a and b are constants, which can be determined according to the preset lightning strike simulation waveform. For example, the values of k, a, and b for the first return stroke 1 / 200μs waveform are 1.011, 3500, and 2500000 respectively; the values of k, a, and b for the subsequent return stroke 0.25 / 100μs waveform are 1.006, 6986, and 10850000 respectively. Among them, the direct lightning current simulation data refers to the current data required in the direct lightning strike simulation model.

[0065] Exemplarily, if the current lightning strike type is the back-strike lightning type, since the equivalent mathematical model of the back-strike lightning can be divided into two parts, one part is the same as that of the direct lightning strike, that is, the lightning current source connecting to the top of the tower, and the other part is used as the high-voltage end of the induced voltage source to connect the wire, that is, the induced voltage induced after the lightning strikes the tower. Therefore, the current lightning strike simulation data under the back-strike lightning type can include back-strike voltage simulation data and back-strike current simulation data. The back-strike voltage simulation data refers to the voltage data required in the back-strike lightning simulation model. The back-strike current simulation data refers to the current data required in the back-strike lightning simulation model. The back-strike current simulation data can be determined by i(t) 反击 = kI m (e -at -e -bt ). The back-strike voltage simulation data can be determined through the following formula:

[0066]

[0067] where u(t) 反击 represents the back-strike voltage simulation data, that is, the induced voltage component during back-strike; m represents the lightning current steepness, that is, it can be determined by the ratio between the lightning current amplitude and the return stroke interval in the target lightning strike data; h c.t represents the suspension height of the wire at the tower, that is, the vertical distance from the connection point of the wire and the tower to the ground; k β represents the ratio of the main discharge speed to the speed of light c; h T represents the tower height; d R represents the oncoming leader length, that is, the channel length before the lightning strike hits an object; h t.av represents the average height of the ground wire from the ground. For a 10 kV distribution line, h t.av can be taken as 0; h c.av represents the average height of the wire from the ground; k0 represents the coupling coefficient, that is, the coupling coefficient between the ground wire and the wire; i represents the instantaneous value of the lightning current, and i can be determined by the back-strike current simulation data, that is, if t in u(t) 反击 is 1, then the lightning current amplitude at t = 1 in the back-strike current simulation data is taken as the instantaneous value of the lightning current.

[0068] Exemplarily, if the current lightning strike type is the induced lightning type, the induced lightning can be equivalent to a voltage source with its high-voltage end connected to the wire. The current lightning strike simulation data under the induced lightning type can be determined through the following formula. At this time, the current lightning strike simulation data is the induced voltage simulation data:

[0069]

[0070] where u(t) 感应 represents the induced voltage simulation data; i(t) 感应Indicates the intermediate data of the induced current, which can be represented by i(t) 感应 = kI m (e -at - e -bt ) is determined; h d represents the distance between the wire and the ground; S represents the distance between the lightning strike point and the wire. Since the lightning strikes the ground and induces a voltage on the wire, the lightning strike point is a certain point on the ground. If the distance between the lightning strike point and the wire is 60m, S is equal to 60; K represents a coefficient, usually taken as 25.

[0071] Among them, the induced voltage simulation data refers to the voltage data required in the induced lightning simulation model. The intermediate data of the induced current refers to the intermediate current value required to determine the induced voltage simulation data.

[0072] It can be understood that by introducing candidate lightning strike simulation data and based on the candidate lightning strike simulation data and the initial lightning strike simulation model, the candidate lightning strike simulation model is determined, realizing the determination of the lightning strike data required when simulating the lightning strike phenomenon using the candidate lightning strike simulation model, and improving the accuracy of the candidate lightning strike simulation model in lightning strike simulation.

[0073] S140. According to each candidate lightning strike simulation model and the line simulation model, determine the candidate lightning current threshold under the corresponding candidate lightning strike type, and based on the candidate lightning current threshold and the target lightning strike data, determine the candidate current threshold probability under the corresponding candidate lightning strike type.

[0074] Among them, the candidate lightning current threshold refers to the minimum lightning current amplitude when the lightning arrester fails. Exemplarily, the candidate lightning current threshold can include the direct lightning strike current threshold, the back flashover lightning current threshold, and the induced lightning current threshold. The direct lightning strike current threshold refers to the minimum lightning current amplitude when the lightning arrester fails under a direct lightning strike. The back flashover lightning current threshold refers to the minimum lightning current amplitude when the lightning arrester fails under a back flashover. The induced lightning current threshold refers to the minimum lightning current amplitude when the lightning arrester fails under an induced lightning strike.

[0075] Among them, the candidate current threshold probability refers to the probability that the lightning current amplitude under different candidate lightning strike types exceeds the corresponding candidate lightning current threshold. Exemplarily, the candidate current threshold probability includes the direct current threshold probability, the induced current threshold probability, and the back flashover current threshold probability. The direct current threshold probability can refer to the probability that the lightning current amplitude under the direct lightning strike type exceeds the direct lightning strike current threshold. The induced current threshold probability refers to the probability that the lightning current amplitude under the induced lightning strike type exceeds the induced lightning current threshold. The back flashover current threshold probability refers to the probability that the lightning current amplitude under the back flashover lightning strike type exceeds the induced lightning current threshold.

[0076] Exemplarily, based on the line simulation model and lightning overvoltage simulation model (i.e., the candidate lightning strike simulation model) of the 10 kV distribution line, different lightning strike conditions are set, and the failure of the lightning arrester is simulated and calculated, that is, the direct lightning strike current amplitude (i.e., the direct candidate lightning current threshold) I1, the back flashover current amplitude I2 (i.e., the back flashover candidate lightning current threshold), and the induced lightning current amplitude I3 (i.e., the induced candidate lightning current threshold) when the absorbed energy is overloaded. For example, I1 can be 14 kA, I2 can be 8.5 kA, and I3 can be 30 kA.

[0077] In an alternative embodiment, according to each candidate lightning strike simulation model and the line simulation model, the candidate lightning current threshold under the corresponding candidate lightning strike type is determined, including: determining the target lightning strike type from the candidate lightning strike types, and using the candidate lightning strike simulation model corresponding to the target lightning strike type as the target lightning strike simulation model; based on the line simulation model and the target lightning strike simulation model, adjusting the current lightning current amplitude under the target lightning strike type, and determining the corresponding current energy value; if the current energy value is greater than the preset energy threshold, then using the corresponding current lightning current amplitude as the target lightning current threshold under the target lightning strike type.

[0078] Among them, the target lightning strike type refers to the candidate lightning strike type for which the candidate lightning current threshold is determined at the current moment. Exemplarily, the target lightning strike type can be one of the direct lightning strike type, the back flashover type, and the induced lightning type. The target lightning strike simulation model refers to the candidate lightning strike simulation model corresponding to the target lightning strike type, that is, the target lightning strike simulation model corresponds to the target lightning strike type. The target lightning current threshold refers to the candidate lightning current threshold corresponding to the target lightning strike type.

[0079] Exemplarily, if the target lightning strike type is the direct lightning strike type, then the target lightning strike simulation model is the direct lightning strike simulation model, and the target lightning current threshold is the direct lightning strike current threshold; if the target lightning strike type is the back flashover type, then the target lightning strike simulation model is the back flashover simulation model, and the target lightning current threshold is the back flashover current threshold; if the target lightning strike type is the induced lightning type, then the target lightning strike simulation model is the induced lightning simulation model, and the target lightning current threshold is the induced lightning current threshold.

[0080] Among them, the current lightning current amplitude refers to the lightning current amplitude provided by the candidate lightning strike simulation model to the line simulation model at the current moment. The current energy value refers to the energy magnitude corresponding to the current lightning current amplitude. The preset energy threshold refers to the energy threshold marked on the lightning arrester.

[0081] Exemplarily, for any candidate lightning strike type, based on the line simulation model and the candidate lightning strike simulation model under this candidate lightning strike type, the current lightning current amplitude under this candidate lightning strike type is adjusted, and the corresponding current energy value is determined; if the current energy value is greater than the preset energy threshold, then using the corresponding current lightning current amplitude as the candidate lightning current threshold under this candidate lightning strike type.

[0082] Specifically, when the current energy value is greater than the preset energy threshold, the current lightning current amplitude at this time is used as the candidate lightning current threshold under the candidate lightning strike type.

[0083] It can be understood that by continuously adjusting the current lightning current amplitude in the target lightning strike simulation model, and according to the current energy value corresponding to the current lightning current amplitude and the preset energy threshold, the target lightning current threshold under the target lightning strike type is determined, which improves the accuracy of the determined target lightning current threshold.

[0084] In an alternative embodiment, determining the candidate current threshold probability under the corresponding candidate lightning strike type according to the candidate lightning current threshold and the target lightning strike data includes: segmenting the target lightning strike data based on a preset current amplitude segmentation interval to determine the number of lightning strike data of the target lightning strike data within each candidate current amplitude segmentation interval; determining the median value of the lightning current amplitude and the curve change rate according to the number of lightning strike data; and determining the candidate current threshold probability under the corresponding candidate lightning strike type based on a preset current threshold probability determination formula according to the candidate lightning current threshold, the median value of the lightning current amplitude, and the curve change rate.

[0085] Among them, the preset current amplitude segmentation interval refers to the interval preset for segmenting and grouping the lightning current amplitude. The embodiments of the present invention do not make any limitation on the setting of the preset current amplitude segmentation interval, which can be set by those skilled in the art according to experience, or determined repeatedly through a large number of tests. Exemplarily, the preset current amplitude segmentation interval can be determined based on the candidate lightning current threshold.

[0086] Among them, the candidate current amplitude segmentation interval refers to the interval obtained by segmenting the lightning current amplitude in the target lightning strike data. The number of lightning strike data refers to the number of lightning current amplitudes in the target lightning strike data within the candidate current amplitude segmentation interval. The median value of the lightning current amplitude refers to the middle value of the lightning current amplitudes of the target lightning strike data. The curve change rate can characterize the change of the number of lightning strike data in different candidate current amplitude segmentation intervals. The current threshold probability determination formula refers to the formula preset for determining the candidate current threshold probability. Exemplarily, the current threshold probability determination formula can be:

[0087]

[0088] Among them, P represents the candidate current threshold probability, that is, the probability that the target lightning strike data has a lightning current amplitude greater than or equal to the candidate lightning current threshold; I0 represents the candidate lightning current threshold; α represents the median value of the lightning current amplitude; β represents the curve change rate.

[0089] Specifically, based on the statistical results of parameters such as the strike frequency, strike interval, first-strike lightning current amplitude, and subsequent-strike lightning current amplitude in the target lightning strike data, several groups are divided according to the magnitude of the lightning current amplitude, the number of occurrences of the lightning current amplitude in each group is statistically analyzed, and the distribution law of the lightning current amplitude of the target strike frequency is analyzed.

[0090] For example, for a single lightning strike, α can be 21.57 and β can be 2.94; if the target strike frequency is 2, then α can be 26.76 and β can be 2.55; if the target strike frequency is 3, then α can be 33.18 and β can be 2.54; if the target strike frequency is 4, then α can be 37.03 and β can be 2.48; if the target strike frequency is 5, then α can be 39.48 and β can be 2.47.

[0091] Continuing with the above example, if the target strike frequency is 2, then substitute α = 26.76 and β = 2.55 into And according to the candidate lightning current thresholds under different candidate lightning strike types, calculate the candidate current threshold probabilities under the corresponding candidate lightning strike types, and obtain the direct strike current threshold probability P1, the counter strike current threshold probability P2, and the induced current threshold probability P3. Among them, P1 is 75.14%, P2 is 91.57%, and P3 is 30.08%.

[0092] It can be understood that by determining the median value of the lightning current amplitude and the curve change rate based on the number of lightning strike data in the target lightning strike data within the segmented interval of the candidate current amplitude, substituting the candidate lightning current thresholds under different candidate lightning strike types, as well as the median value of the lightning current amplitude and the curve change rate into the current threshold probability determination formula, the accuracy of the determined candidate current threshold probability is improved.

[0093] S150. According to each candidate current threshold probability, the preset lightning strike event proportion, and the distribution line parameters, determine the arrester anomaly probability under the target strike frequency, and perform safety protection on the distribution lines in the area to be processed according to the arrester anomaly probability.

[0094] Among them, the arrester anomaly probability refers to the probability of arrester failure.

[0095] Exemplarily, the arresters of the distribution lines in the area to be processed can be adjusted and set according to the arrester anomaly probability.

[0096] An embodiment of the present invention provides a safety protection solution for a distribution line. By obtaining the distribution line parameters and candidate lightning strike data of the distribution line in the area to be processed, and constructing a line simulation model according to the distribution line parameters; determining model simulation data according to the candidate lightning strike data, and determining an initial lightning strike simulation model according to the model simulation data and a preset lightning strike simulation waveform; determining candidate lightning strike simulation models corresponding to each candidate lightning strike type according to the initial lightning strike simulation model, the distribution line parameters and the target lightning strike data; wherein, the candidate lightning strike types include direct lightning strike type, induced lightning strike type and back strike type; the target lightning strike data is screened from the candidate lightning strike data based on the target return strike frequency in the model simulation data; determining candidate lightning current thresholds corresponding to the respective candidate lightning strike types according to each candidate lightning strike simulation model and the line simulation model, and determining candidate current threshold probabilities corresponding to the respective candidate lightning strike types according to the candidate lightning current thresholds and the target lightning strike data; wherein, the candidate current threshold probabilities include direct current threshold probability, induced current threshold probability and back strike current threshold probability; determining the abnormal probability of the lightning arrester at the target return strike frequency according to each candidate current threshold probability, the preset lightning strike event ratio and the distribution line parameters, and performing safety protection on the distribution line in the area to be processed according to the abnormal probability of the lightning arrester. In the above solution, by constructing a line simulation model and candidate lightning strike simulation models under different candidate lightning strike types, determining candidate lightning current thresholds under each candidate lightning strike type, determining candidate current threshold probabilities corresponding to the respective candidate lightning strike types according to the candidate lightning current thresholds and the target lightning strike data, and further determining the abnormal probability of the lightning arrester according to the candidate current threshold probabilities, the determination of the failure probability of the lightning arrester under multiple lightning strikes is realized, the accuracy of the determined abnormal probability of the lightning arrester is improved, and further the accuracy of the safety protection of the distribution line in the area to be processed based on the abnormal probability of the lightning arrester is improved, that is, the safety of the distribution line in the area to be processed is improved.

[0097] Embodiment 2

[0098] Figure 2 It is a flowchart of a safety protection method for a distribution line provided by Embodiment 2 of the present invention. On the basis of the above embodiments, further, the operation of "determining the abnormal probability of the lightning arrester at the target return strike frequency according to each candidate current threshold probability, the preset lightning strike event ratio and the distribution line parameters" is refined into "obtaining the ground flash density in the area to be processed, and determining the number of lightning strikes on the line according to the ground flash density, the tower height and the ground wire distance in the distribution line parameters; determining the abnormal probability of the lightning arrester according to the number of lightning strikes on the line, the candidate current threshold probability and the lightning strike event ratio", so as to improve the determination mechanism of the abnormal probability of the lightning arrester. It should be noted that for the parts not detailed in the embodiments of the present invention, reference can be made to the descriptions of other embodiments.

[0099] See Figure 2The safety protection method for the distribution line shown includes:

[0100] S210. Obtain the distribution line parameters and candidate lightning strike data of the distribution line in the area to be processed, and construct a line simulation model according to the distribution line parameters.

[0101] S220. Determine the model simulation data according to the candidate lightning strike data, and determine the initial lightning strike simulation model according to the model simulation data and the preset lightning strike simulation waveform.

[0102] S230. Determine the candidate lightning strike simulation model corresponding to the candidate lightning strike type according to the initial lightning strike simulation model, the distribution line parameters, and the target lightning strike data.

[0103] Among them, the candidate lightning strike types include direct lightning strike type, induced lightning strike type, and counterattack lightning strike type; the target lightning strike data is screened from the candidate lightning strike data based on the target return stroke frequency in the model simulation data.

[0104] S240. Determine the candidate lightning current threshold under the candidate lightning strike type according to the candidate lightning strike simulation model and the line simulation model, and determine the candidate current threshold probability under the candidate lightning strike type according to the candidate lightning current threshold and the target lightning strike data.

[0105] Among them, the candidate current threshold probabilities include direct lightning current threshold probability, induced lightning current threshold probability, and counterattack lightning current threshold probability.

[0106] S250. Obtain the ground flash density in the area to be processed, and determine the number of lightning strikes on the line according to the ground flash density, the tower height, and the distance between ground wires in the distribution line parameters.

[0107] Among them, the ground flash density refers to the number of lightning strikes per square kilometer per year in the area to be processed. The distance between ground wires refers to the distance between two ground wires. The number of lightning strikes on the line refers to the number of lightning strikes per 1000 kilometers of the line per year in the area to be processed.

[0108] Exemplarily, the number of lightning strikes on the line can be determined by the following formula:

[0109] N L = 0.1N g (28h T 0.6 +q);

[0110] Among them, N L represents the number of lightning strikes on the line, with the unit of (times / 100km·year); N g represents the ground flash density, with the unit of (times / (km 2 ·year)); h Trepresents the height of the pole tower; q represents the distance of the ground wire (m). If the distribution line is a 10 kV distribution line, then q can be 0.

[0111] S260. Determine the abnormal probability of the lightning arrester according to the lightning strike times of the line, the candidate current threshold probability, and the proportion of lightning strike events.

[0112] Among them, the proportion of lightning strike events refers to the proportion of events of different candidate lightning strike types in the area to be processed. Exemplarily, the proportion of lightning strike events can be determined based on the historical lightning strike events in the area to be processed.

[0113] In an optional embodiment, determining the abnormal probability of the lightning arrester according to the lightning strike times of the line, the candidate current threshold probability, and the proportion of lightning strike events includes: determining the first abnormal probability of the lightning arrester according to the lightning strike times of the line, the direct strike current threshold probability, the counter strike current threshold probability, the preset pole strike rate, and the proportion of lightning strike events corresponding to the direct lightning strike type and the counter strike lightning strike type; determining the second abnormal probability of the lightning arrester according to the lightning strike times of the line, the induced current threshold probability, and the proportion of lightning strike events corresponding to the induced lightning strike type; determining the abnormal probability of the lightning arrester according to the first abnormal probability of the lightning arrester and the second abnormal probability of the lightning arrester.

[0114] Among them, the preset pole strike rate refers to the ratio of the number of times of lightning strikes on the line pole tower preset in advance to the total number of lightning strikes on the line. Exemplarily, the preset pole strike rate can be set according to the number of ground wires and the terrain. For example, if the number of ground wires is 0, the preset pole strike rate for both plain terrain and hilly terrain is 1 / 2; if the number of ground wires is 1, the preset pole strike rate for plain terrain is 1 / 4, and the preset pole strike rate for hilly terrain is 1 / 3; if the number of ground wires is 2, the preset pole strike rate for plain terrain is 1 / 6, and the preset pole strike rate for hilly terrain is 1 / 3.

[0115] Among them, the first abnormal probability of the lightning arrester refers to the probability of the lightning arrester failure under the direct lightning strike type and the counter strike lightning strike type. The second abnormal probability of the lightning arrester refers to the probability of the lightning arrester failure under the induced lightning strike type.

[0116] Exemplarily, the abnormal probability of the lightning arrester can be determined by the following formula:

[0117] N1 = y1N L [(1 - g)P1 + gP2];

[0118] N2 = y2N L P3;

[0119] N = N1 + N2;

[0120] Wherein, N represents the abnormal probability of the lightning arrester; N1 represents the abnormal probability of the first lightning arrester, with the unit of (times / (100km·year)); N2 represents the abnormal probability of the second lightning arrester, with the unit of (times / (100km·year)); P1 represents the probability of the direct lightning current threshold; P2 represents the probability of the back-stroke lightning current threshold; P3 represents the probability of the induced lightning current threshold; g represents the preset pole-striking rate; y1 represents the proportion of lightning strike events corresponding to the direct lightning type and the back-stroke lightning type; y2 represents the proportion of lightning strike events corresponding to the induced lightning type.

[0121] For example, in the accidents of 10kV distribution lines, the proportion of lightning strike events of the induced lightning type is about 80%, and the proportion of lightning strike events of the direct lightning type and the back-stroke lightning type is about 20%. Then, y1 can be set to 0.2 and y2 can be set to 0.8 and substituted into the above formula to obtain the abnormal probability of the lightning arrester under the 10kV distribution line.

[0122] Continuing with the above example, the failure probability of the lightning arrester under the direct lightning type is 69.05 times / (100km·year), the failure probability of the lightning arrester under the back-stroke lightning type is 84.11 times / (100km·year), the failure probability of the lightning arrester under the induced lightning type is 27.63 times / (100km·year), and the abnormal probability of the lightning arrester is 36.51 times / (100km·year). From the above data, it can be seen that the failure probability of the lightning arrester of the 10kV distribution line caused by multiple lightning strikes is relatively high, which is 36.51 times / (100km·a). This is consistent with the understanding that the insulation level of the 10kV distribution line is relatively low and electrical equipment is easily damaged. Therefore, the influence of multiple lightning strikes cannot be ignored in the calculation of the failure probability of the overhead line lightning arrester.

[0123] It can be understood that by respectively determining the abnormal probability of the first lightning arrester under the direct lightning type and the back-stroke lightning type, and the abnormal probability of the second lightning arrester under the induced lightning type according to the proportion of lightning strike events, and determining the abnormal probability of the lightning arrester according to the abnormal probability of the first lightning arrester and the abnormal probability of the second lightning arrester, the accuracy and effectiveness of the determined abnormal probability of the lightning arrester are improved.

[0124] S270. Perform safety protection on the distribution lines in the area to be processed according to the abnormal probability of the lightning arrester.

[0125] Exemplarily, if the abnormal probability of the lightning arrester reaches the preset abnormal probability threshold of the corresponding distribution line, safety protection is performed on the distribution lines in the area to be processed. The embodiments of the present invention do not make any limitation on the size of the preset abnormal probability threshold, which can be set by those skilled in the art according to experience or needs, or determined repeatedly through a large number of tests.

[0126] An embodiment of the present invention provides a safety protection solution for a distribution line. By determining the abnormal probability operation of the lightning arrester at the target return stroke frequency according to the probability of each candidate current threshold, the preset proportion of lightning strike events, and the distribution line parameters, it is refined to obtain the ground flash density in the area to be processed, and determine the number of lightning strikes on the line according to the ground flash density and the pole height and ground wire distance in the distribution line parameters; determine the abnormal probability of the lightning arrester according to the number of lightning strikes on the line, the probability of the candidate current threshold, and the proportion of lightning strike events, improving the determination mechanism of the abnormal probability of the lightning arrester. In the above solution, by introducing the number of lightning strikes on the line and determining the abnormal probability of the lightning arrester according to the number of lightning strikes on the line, the probability of the candidate current threshold, and the proportion of lightning strike events, the accuracy of the determined abnormal probability of the lightning arrester is improved.

[0127] Embodiment III

[0128] Based on the above embodiment, an optional example is provided in an embodiment of the present invention. It should be noted that for parts not detailed in the embodiment of the present invention, reference may be made to the descriptions of other embodiments.

[0129] Distribution lines are widely distributed and have a complex structure, with a low insulation level. At the same time, line faults caused by lightning strikes emerge in an endless stream. Installing line lightning arresters can effectively suppress line overvoltage. However, in recent years, accidents in which zinc oxide lightning arresters of the power grid fail due to lightning strikes have been very common. Therefore, in order to improve the rationality of the installation and use of lightning arresters in the line, it is necessary to conduct a specific analysis of their electromagnetic transient characteristics under lightning strikes and make a relatively reasonable calculation of the failure rate of lightning arresters caused by lightning strikes.

[0130] Currently, the research on the failure rate of line lightning arresters mainly focuses on single lightning strikes, and there is little calculation of the failure rate of lightning arresters considering multiple lightning strikes. However, there are significant differences in parameters such as the probability of lightning strikes at each frequency, the cumulative function of lightning current amplitude, and the lightning current waveform between single lightning strikes and multiple lightning strikes, which have a great impact on the calculation of the failure rate of lightning arresters, resulting in the difficulty of directly applying the previous calculation method under the single lightning strike condition to the multiple lightning strike condition. Therefore, it is necessary to make a relatively reasonable calculation of the failure rate of lightning arresters caused by multiple lightning strikes.

[0131] In an embodiment of the present invention, based on the characteristic parameters of a typical 10kV distribution line, an electromagnetic transient simulation model corresponding to lightning overvoltage is established, the parameter characteristics of multiple lightning strikes on overhead lines in the lightning location system are statistically analyzed, the research on the failure of line lightning arresters under different multiple lightning strike conditions is carried out, the probability function of lightning current amplitude for different lightning strike times and lightning strike orders is statistically analyzed, and a calculation method for the lightning strike failure probability of line lightning arresters under multiple lightning strikes considering the probability of lightning strikes at each frequency and the probability distribution function of lightning current amplitude is proposed.

[0132] Exemplarily, an embodiment of the present invention proposes a calculation method for the failure probability of a 10 kV lightning arrester under multiple lightning strike conditions, including: S1. According to the actual line parameters (i.e., distribution line parameters), a simulation model of a 10 kV overhead line (i.e., line simulation model) is built in an electromagnetic transient simulation software; S2. Based on the multiple lightning strike statistical results of a lightning location system and combined with the waveform characteristics of multiple lightning strike parameters, a lightning overvoltage simulation model of a 10 kV distribution line (i.e., candidate lightning strike simulation model) is established, and the lightning current amplitude (i.e., candidate lightning current threshold) at the time of the lightning arrester failure is simulated and calculated; S3. The probability functions of the lightning current amplitudes (i.e., candidate current threshold probabilities) for different lightning strike times and orders are statistically analyzed by using the lightning location system; S4. According to the improved calculation formula for the failure probability of the lightning arrester, the failure probability of the 10 kV lightning arrester (i.e., lightning arrester abnormality probability) considering the lightning strike probabilities of each frequency and the probability distribution function of the lightning current amplitude is calculated.

[0133] Specifically, in step S1, a typical 10 kV distribution line is taken as the research object, and the basic parameters of the line are collected and statistically analyzed and applied to the subsequent electromagnetic transient simulation modeling. The distribution line parameters include but are not limited to: line parameters such as the total line length, conductor type, span, sag, and the height and spacing of each phase conductor; tower parameters such as the structure type, tower height, grounding resistance, insulator type and length; lightning arrester parameters such as the rated voltage, lightning impulse residual voltage, volt-ampere characteristic, energy threshold, etc.

[0134] Furthermore, according to the parameters of the 10 kV distribution line, a corresponding electromagnetic transient simulation analysis model of the 10 kV distribution line (i.e., line simulation model) is established in the electromagnetic transient simulation software. The line uses an LGJ-50 type conductor and is built using a frequency-dependent model with an average span of 50 m; the line is supported by reinforced concrete towers as the basic towers and is built using a multi-wave impedance model, and the scaled tower dimensions are input. The tower grounding resistance uses a resistance model with a value of 10 Ω; the line insulator model is S-270, and the leader development method is selected as the flashover criterion. The flashover process of the insulator string is simulated by a circuit breaker, and the opening and closing of the circuit breaker are determined by the voltage at both ends of the insulator and the flashover criterion; the line lightning arrester model is YHWS5-17 / 50, and the installation density is installed on each pole. The upper limit of the absorbed energy is related to the energy absorption per unit volume of the material of the internal resistor disc. The commonly used resistor disc for 10 kV is the D3 series, and the energy absorption density per unit volume is approximately 200 kJ / cm3. The upper limit of the energy absorbed by a single resistor disc is about 8.4 kJ. The 10 kV lightning arrester contains 5 resistor discs inside, and the calculated upper limit of the energy absorbed by the whole lightning arrester is about 42 kJ.

[0135] Specifically, in step S2, based on the statistical results of multiple lightning strike parameters in the lightning location system and referring to the waveform characteristics of multiple lightning strike parameters, the detailed waveforms and parameter characteristics of the lightning current mathematical model in multiple lightning strikes are proposed, including parameters such as the candidate return stroke frequency, candidate return stroke interval, first return stroke lightning current amplitude, subsequent return stroke lightning current amplitude, etc. Among them, the waveform of each return stroke should adopt multiple lightning strike waveform parameters (i.e., preset lightning strike simulation waveforms).

[0136] Furthermore, the lightning strike interval under multiple lightning strikes is relatively long. When subsequent return strokes occur, the insulation level of the line basically returns to normal. Therefore, the simulation of direct lightning strikes and induced lightning strikes under multiple lightning strikes can be regarded as the simulation of multiple single lightning strikes. Combining the parameter characteristics of the lightning current mathematical model in multiple lightning strikes proposed, an electromagnetic transient simulation analysis model of direct lightning strikes, induced lightning strikes, and counterattack overvoltages of a 10 kV distribution line is established in the electromagnetic transient simulation software, and the lightning arrester failure is simulated and calculated, that is, the direct lightning strike current amplitude I1, counterattack lightning current amplitude I2, and induced lightning strike current amplitude I3 when the absorbed energy is overloaded. Among them, different values of the lightning current waveform parameters of each return stroke will affect the simulation calculation of the lightning current amplitude.

[0137] Specifically, in step S3, the lightning strike probability of each frequency is statistically analyzed by the lightning location system, and combined with the statistical results of the lightning current amplitudes of the first return stroke and subsequent return strokes of multiple lightning strikes, the distribution law of the lightning current amplitudes of different return strokes is analyzed. Referring to the lightning current amplitude probability formula (i.e., the current threshold probability determination formula), the parameter values of the lightning current amplitude probability formula suitable for the statistical results of the lightning location system are obtained by fitting (i.e., the median value of the lightning current amplitude and the curve change rate are obtained). According to the fitted lightning current amplitude probability formula, combined with the lightning current amplitudes (i.e., candidate lightning current thresholds) when the lightning arrester fails under different multiple lightning strike conditions, the probabilities P1 of exceeding the direct lightning strike current amplitude, P2 of exceeding the counterattack lightning current amplitude, and P3 of exceeding the induced lightning strike current amplitude when the lightning arrester fails are calculated.

[0138] Specifically, in step S4, based on the lightning current amplitudes (i.e., candidate lightning current thresholds) when the lightning arrester fails under different multiple lightning strike conditions in step S2 and the lightning current amplitude probability functions (i.e., candidate current threshold probabilities) of different lightning strike times and lightning strike orders in step S3, according to the improved lightning arrester failure rate calculation formula, the failure probability of the 10 kV lightning arrester (i.e., the lightning arrester abnormal probability) considering the lightning strike probability of each frequency and the lightning current amplitude probability distribution function is calculated.

[0139] In the embodiment of the present invention, the characteristic parameters of a typical 10kV distribution line are statistically analyzed, and an electromagnetic transient simulation model of a line arrester under lightning overvoltage of a typical 10kV distribution line is established and analyzed. The lightning current amplitude of the energy overload of the line arrester of a typical 10kV line under different multiple lightning strike conditions is obtained, and the parameter characteristics of the multiple lightning strike lightning current of the overhead transmission line in the lightning location system are statistically analyzed. The probability function of the lightning current amplitude for different lightning strike times and lightning strike sequences is calculated, and a calculation method for the lightning strike failure probability of a line arrester under multiple lightning strikes considering the probability of each frequency of lightning strike and the probability distribution function of the lightning current amplitude is proposed, so as to improve the rationality of the use and maintenance of the arrester, make a reasonable prediction of the lightning strike failure probability of the arrester, and improve the accuracy of the lightning protection analysis method of the power system.

[0140] Embodiment 4

[0141] Figure 3 FIG. is a schematic structural diagram of a safety protection device for a distribution line provided in Embodiment 4 of the present invention. This embodiment is applicable to the situation of lightning protection for a distribution line. This method can be executed by the safety protection device for a distribution line. The device can be implemented in a software and / or hardware manner and can be configured in an electronic device carrying the safety protection function of the distribution line.

[0142] As Figure 3 shown, the device includes: a line simulation model construction module 310, an initial lightning strike model construction module 320, a candidate lightning strike model determination module 330, a current threshold probability determination module 340, and a line protection module 350. Among them,

[0143] The line simulation model construction module 310 is configured to obtain the distribution line parameters and candidate lightning strike data of the distribution line in the area to be processed, and construct a line simulation model according to the distribution line parameters;

[0144] The initial lightning strike model construction module 320 is configured to determine model simulation data according to the candidate lightning strike data, and determine an initial lightning strike simulation model according to the model simulation data and a preset lightning strike simulation waveform;

[0145] The candidate lightning strike model determination module 330 is configured to determine a candidate lightning strike simulation model corresponding to each candidate lightning strike type according to the initial lightning strike simulation model, the distribution line parameters, and the target lightning strike data; wherein, the candidate lightning strike types include direct lightning strike type, induced lightning strike type, and counterattack lightning strike type; the target lightning strike data is screened from the candidate lightning strike data based on the target return stroke frequency in the model simulation data; the lightning current threshold probability determination module 340 is configured to determine a candidate lightning current threshold under the corresponding candidate lightning strike type according to each candidate lightning strike simulation model and the line simulation model, and determine a candidate current threshold probability under the corresponding candidate lightning strike type according to the candidate lightning current threshold and the target lightning strike data; wherein, the candidate current threshold probabilities include direct strike current threshold probability, induced current threshold probability, and counterattack current threshold probability;

[0146] The line protection module 350 is configured to determine the abnormal probability of the lightning arrester under the target return stroke frequency according to each candidate current threshold probability, the preset lightning strike event proportion, and the distribution line parameters, and perform safety protection on the distribution lines in the area to be processed according to the abnormal probability of the lightning arrester.

[0147] An embodiment of the present invention provides a safety protection solution for a distribution line. By obtaining the distribution line parameters and candidate lightning strike data of the distribution line in the area to be processed, and constructing a line simulation model according to the distribution line parameters; determining model simulation data according to the candidate lightning strike data, and determining an initial lightning strike simulation model according to the model simulation data and a preset lightning strike simulation waveform; determining candidate lightning strike simulation models corresponding to each candidate lightning strike type according to the initial lightning strike simulation model, the distribution line parameters and the target lightning strike data; wherein, the candidate lightning strike types include direct lightning strike type, induced lightning strike type and back strike type; the target lightning strike data is screened from the candidate lightning strike data based on the target return strike frequency in the model simulation data; determining candidate lightning current thresholds corresponding to the respective candidate lightning strike types according to each candidate lightning strike simulation model and the line simulation model, and determining candidate current threshold probabilities corresponding to the respective candidate lightning strike types according to the candidate lightning current thresholds and the target lightning strike data; wherein, the candidate current threshold probabilities include direct current threshold probability, induced current threshold probability and back strike current threshold probability; determining the abnormal probability of the lightning arrester under the target return strike frequency according to each candidate current threshold probability, the preset lightning strike event proportion and the distribution line parameters, and performing safety protection on the distribution line in the area to be processed according to the abnormal probability of the lightning arrester. In the above solution, by constructing a line simulation model and candidate lightning strike simulation models under different candidate lightning strike types, determining candidate lightning current thresholds under each candidate lightning strike type, determining candidate current threshold probabilities corresponding to the respective candidate lightning strike types according to the candidate lightning current thresholds and the target lightning strike data, and then determining the abnormal probability of the lightning arrester according to the candidate current threshold probabilities, the determination of the failure probability of the lightning arrester under multiple lightning strikes is realized, the accuracy of the determined abnormal probability of the lightning arrester is improved, and further the accuracy of the safety protection of the distribution line in the area to be processed based on the abnormal probability of the lightning arrester is improved, that is, the safety of the distribution line in the area to be processed is improved.

[0148] Optionally, the line protection module 350 includes:

[0149] A line lightning strike count determination unit, configured to obtain the ground flash density in the area to be processed, and determine the line lightning strike count according to the ground flash density and the tower height and ground wire distance in the distribution line parameters;

[0150] A lightning arrester abnormal probability determination unit, configured to determine the abnormal probability of the lightning arrester according to the line lightning strike count, the candidate current threshold probability and the lightning strike event proportion.

[0151] Optionally, the lightning arrester abnormal probability determination unit is specifically configured to:

[0152] Determine the abnormal probability of the first lightning arrester according to the number of lightning strikes on the line, the direct lightning current threshold probability, the backflashover current threshold probability, the preset pole-striking rate, and the proportion of lightning strike events corresponding to the direct lightning type and the backflashover lightning type;

[0153] Determine the abnormal probability of the second lightning arrester according to the number of lightning strikes on the line, the induced current threshold probability, and the proportion of lightning strike events corresponding to the induced lightning type;

[0154] Determine the abnormal probability of the lightning arrester according to the abnormal probability of the first lightning arrester and the abnormal probability of the second lightning arrester.

[0155] Optionally, the current threshold probability determination module 340 includes:

[0156] A lightning strike data quantity determination unit, configured to segment the target lightning strike data based on a preset current amplitude segmentation interval, and determine the quantity of lightning strike data of the target lightning strike data within each candidate current amplitude segmentation interval;

[0157] A reference data determination unit, configured to determine the median value of the lightning current amplitude and the curve change rate according to the quantity of lightning strike data;

[0158] A current threshold probability determination unit, configured to determine the candidate current threshold probability under the corresponding candidate lightning strike type based on a preset current threshold probability determination formula, according to the candidate lightning current threshold, the median value of the lightning current amplitude, and the curve change rate.

[0159] Optionally, the candidate lightning strike model determination module 330 includes:

[0160] A candidate lightning strike simulation data determination unit, configured to determine candidate lightning strike simulation data under the candidate lightning strike type according to the distribution line parameters and the target lightning strike data;

[0161] A candidate lightning strike simulation model determination unit, configured to determine a candidate lightning strike simulation model under the corresponding candidate lightning strike type according to the candidate lightning strike simulation data and the initial lightning strike simulation model.

[0162] Optionally, if the candidate lightning strike data includes candidate return stroke frequencies, candidate return stroke intervals, and candidate lightning current amplitudes, the initial lightning strike model construction module 320 includes:

[0163] A target return stroke frequency determination unit, configured to determine the frequency proportion of the candidate return stroke frequencies, and determine the target return stroke frequency from the candidate return stroke frequencies according to the frequency proportion;

[0164] A target return stroke interval determination unit, configured to determine the average interval of the candidate return stroke intervals, and determine the target return stroke interval according to the average interval;

[0165] A target lightning current amplitude determining unit, configured to determine a target lightning current amplitude according to the candidate lightning current amplitudes.

[0166] A model simulation data generating unit, configured to generate model simulation data including the target strike frequency, the target strike interval, and the target lightning current amplitude.

[0167] Optionally, the current threshold probability determining module 340 includes:

[0168] A target lightning strike type determining unit, configured to determine a target lightning strike type from the candidate lightning strike types, and use the candidate lightning strike simulation model corresponding to the target lightning strike type as the target lightning strike simulation model.

[0169] A current energy value determining unit, configured to adjust the current lightning current amplitude under the target lightning strike type based on the line simulation model and the target lightning strike simulation model, and determine the corresponding current energy value.

[0170] A target lightning current threshold determining unit, configured to use the corresponding current lightning current amplitude as the target lightning current threshold under the target lightning strike type if the current energy value is greater than a preset energy threshold.

[0171] The safety protection device for a distribution line provided by an embodiment of the present invention can execute the safety protection method for a distribution line provided by any embodiment of the present invention, and has function modules and beneficial effects corresponding to executing the safety protection methods for various distribution lines.

[0172] In the technical solution of the present invention, the collection, storage, use, processing, transmission, provision, and disclosure of distribution line parameters, candidate lightning strike data, ground flash density, etc. comply with the provisions of relevant laws and regulations and do not violate public order and good customs.

[0173] Embodiment 5

[0174] Figure 4 It is a schematic structural diagram of an electronic device for implementing the safety protection method of a distribution line provided by Embodiment 5 of the present invention. The electronic device 410 is intended to represent various forms of digital computers, such as, laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as, personal digital processors, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are only examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0175] As shown Figure 4 in FIG. 406, the electronic device 410 includes at least one processor 411, and a memory communicatively connected to the at least one processor 411, such as a read-only memory (ROM) 412, a random access memory (RAM) 413, etc. The memory stores a computer program executable by the at least one processor. The processor 411 can execute various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 412 or the computer program loaded from the storage unit 418 into the random access memory (RAM) 413. In the RAM 413, various programs and data required for the operation of the electronic device 410 can also be stored. The processor 411, the ROM 412, and the RAM 413 are connected to each other via a bus 414. An input / output (I / O) interface 415 is also connected to the bus 414.

[0176] Multiple components in the electronic device 410 are connected to the I / O interface 415, including: an input unit 416, such as a keyboard, a mouse, etc.; an output unit 417, such as various types of displays, speakers, etc.; a storage unit 418, such as a magnetic disk, an optical disc, etc.; and a communication unit 419, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 419 allows the electronic device 410 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0177] The processor 411 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the processor 411 include but are not limited to a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 411 executes the various methods and processes described above, such as the safety protection method for the power distribution line.

[0178] In some embodiments, the safety protection method for the power distribution line can be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as the storage unit 418. In some embodiments, part or all of the computer program can be loaded and / or installed onto the electronic device 410 via the ROM 412 and / or the communication unit 419. When the computer program is loaded into the RAM 413 and executed by the processor 411, one or more steps of the safety protection method for the power distribution line described above can be executed. Alternatively, in other embodiments, the processor 411 can be configured to execute the safety protection method for the power distribution line in any other appropriate manner (e.g., by means of firmware).

[0179] The various embodiments of the systems and techniques described above in this specification can be implemented in digital electronic circuitry, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on a chip (SOCs), complex programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include: being implemented in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which may be a special-purpose or general-purpose programmable processor that receives data and instructions from, and transmits data and instructions to, a storage system, at least one input device, and at least one output device.

[0180] The computer programs for implementing the methods of the present invention can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions / operations specified in the flowchart and / or block diagram to be implemented. The computer programs can be executed entirely on the machine, partly on the machine, as a stand-alone software package partly on the machine and partly on a remote machine or entirely on the remote machine or server.

[0181] In the context of the present invention, a computer-readable storage medium can be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer-readable storage medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. Alternatively, the computer-readable storage medium can be a machine-readable signal medium. More specific examples of the machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0182] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device for displaying information to the user (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor); and a keyboard and a pointing device (e.g., a mouse or a trackball) through which the user can provide input to the electronic device. Other kinds of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0183] The systems and techniques described herein can be implemented in a computing system including backend components (e.g., as a data server), or a computing system including middleware components (e.g., an application server), or a computing system including frontend components (e.g., a user computer having a graphical user interface or a web browser through which the user can interact with an implementation of the systems and techniques described herein), or a computing system including any combination of such backend components, middleware components, or frontend components. The components of the system can be interconnected to each other by digital data communication in any form or medium (e.g., a communication network). Examples of communication networks include: local area network (LAN), wide area network (WAN), blockchain network, and the Internet.

[0184] The computing system can include a client and a server. The client and the server are generally far from each other and usually interact through a communication network. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or a cloud host, which is a host product in the cloud computing service system and solves the defects of difficult management and weak business scalability existing in traditional physical hosts and VPS services.

[0185] It should be understood that various forms of the processes shown above can be used, with steps reordered, added, or deleted. For example, the steps recited in the present invention can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved, and no limitation is imposed herein.

[0186] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for protecting power distribution lines, characterized in that: include: Obtaining distribution line parameters and candidate lightning strike data of distribution lines in a to-be-processed area, and constructing a line simulation model according to the distribution line parameters; Determine model simulation data according to the candidate lightning strike data, and determine an initial lightning strike simulation model according to the model simulation data and a preset lightning strike simulation waveform; Determine a candidate lightning strike simulation model corresponding to each candidate lightning strike type according to the initial lightning strike simulation model, the distribution line parameters and the target lightning strike data; wherein the candidate lightning strike types include direct lightning strike type, induced lightning strike type and counter-strike lightning type; the target lightning strike data is obtained by screening from the candidate lightning strike data based on the target counter-strike frequency in the model simulation data; Determine a candidate lightning current threshold value under the corresponding candidate lightning strike type according to each of the candidate lightning strike simulation models and the line simulation model, and determine a candidate current threshold probability under the corresponding candidate lightning strike type according to the candidate lightning current threshold value and the target lightning strike data; wherein the candidate current threshold probability includes a direct current threshold probability, an induced current threshold probability and a counter-strike current threshold probability; According to the probability of each candidate current threshold, the preset proportion of lightning strike events and the distribution line parameters, the abnormal probability of the lightning arrester under the target return stroke frequency is determined, and the distribution lines in the area to be processed are safely protected according to the abnormal probability of the lightning arrester.

2. The method according to claim 1, characterized in that The determining, according to each of the candidate current threshold probabilities, the preset lightning strike event ratio and the distribution line parameters, the arrester abnormality probability under the target return stroke frequency includes: Obtaining the ground-to-ground lightning density in the area to be processed, and determining the number of lightning strikes on the line according to the ground-to-ground lightning density and the tower height and ground wire distance in the distribution line parameters; The abnormal probability of the arrester is determined according to the number of lightning strikes on the line, the candidate current threshold probability and the proportion of lightning strike events.

3. The method according to claim 2, characterized in that The determining the abnormal probability of the arrester according to the number of lightning strikes on the line, the candidate current threshold probability and the proportion of lightning strike events includes: Determine the abnormal probability of the first lightning arrester according to the number of lightning strikes on the line, the direct current threshold probability, the counter-strike current threshold probability, the preset rod striking rate, and the proportion of lightning strike events corresponding to the direct lightning type and the counter-strike lightning type; Determine the abnormal probability of the second lightning arrester according to the number of lightning strikes on the line, the induced current threshold probability and the proportion of lightning strike events corresponding to the induced lightning type; The arrester abnormality probability is determined according to the first arrester abnormality probability and the second arrester abnormality probability.

4. The method according to claim 1, characterized in that The determining, according to the candidate lightning current threshold and the target lightning strike data, the candidate current threshold probability under the corresponding candidate lightning strike type comprises: Based on a preset current amplitude segmentation interval, the target lightning strike data is segmented to determine the number of lightning strike data of the target lightning strike data within each candidate current amplitude segmentation interval; Determining the lightning current amplitude median and the curve change rate according to the amount of lightning strike data; Based on a preset current threshold probability determination formula, the candidate current threshold probability under the corresponding candidate lightning stroke type is determined according to the candidate lightning current threshold, the lightning current amplitude median and the curve change rate.

5. The method according to claim 1, characterized in that The step of determining a candidate lightning strike simulation model corresponding to each candidate lightning strike type according to the initial lightning strike simulation model, the distribution line parameters and the target lightning strike data includes: Determining candidate lightning strike simulation data under the candidate lightning strike type according to the distribution line parameters and the target lightning strike data; A candidate lightning strike simulation model under a corresponding candidate lightning strike type is determined according to the candidate lightning strike simulation data and the initial lightning strike simulation model.

6. The method according to claim 1, characterized in that If the candidate lightning strike data includes a candidate return stroke frequency, a candidate return stroke interval, and a candidate lightning current amplitude, then determining the model simulation data according to the candidate lightning strike data includes: Determine the frequency ratio of the candidate response frequencies, and determine a target response frequency from the candidate response frequencies according to the frequency ratio; Determine an interval average value of the candidate return strike intervals, and determine a target return strike interval based on the interval average value; Determining a target lightning current amplitude according to the candidate lightning current amplitude; Generate model simulation data including the target return stroke frequency, the target return stroke interval and the target lightning current amplitude.

7. The method according to any one of claims 1 to 6, characterized in that The step of determining a candidate lightning current threshold value under a corresponding candidate lightning strike type according to each of the candidate lightning strike simulation models and the line simulation model includes: Determine a target lightning strike type from the candidate lightning strike types, and use the candidate lightning strike simulation model corresponding to the target lightning strike type as the target lightning strike simulation model; Based on the line simulation model and the target lightning strike simulation model, adjusting the current lightning current amplitude under the target lightning strike type, and determining the corresponding current energy value; If the current energy value is greater than the preset energy threshold, the corresponding current lightning current amplitude is used as the target lightning current threshold under the target lightning stroke type.

8. A safety protection device for a power distribution line, characterized in that: include: A line simulation model building module is used to obtain distribution line parameters and candidate lightning strike data of distribution lines in a to-be-processed area, and to build a line simulation model according to the distribution line parameters; An initial lightning strike model building module is used to determine model simulation data according to the candidate lightning strike data, and to determine an initial lightning strike simulation model according to the model simulation data and a preset lightning strike simulation waveform; A candidate lightning strike model determination module is used to determine a candidate lightning strike simulation model corresponding to each candidate lightning strike type according to the initial lightning strike simulation model, the distribution line parameters and the target lightning strike data; wherein the candidate lightning strike types include direct lightning strike type, induced lightning strike type and counter-strike lightning type; the target lightning strike data is obtained by screening from the candidate lightning strike data based on the target counter-strike frequency in the model simulation data; A current threshold probability determination module, used to determine a candidate lightning current threshold under a corresponding candidate lightning strike type according to each of the candidate lightning strike simulation models and the line simulation model, and to determine a candidate current threshold probability under a corresponding candidate lightning strike type according to the candidate lightning current threshold and the target lightning strike data; wherein the candidate current threshold probability includes a direct current threshold probability, an induced current threshold probability, and a strike back current threshold probability; The line protection module is used to determine the arrester abnormality probability under the target return stroke frequency according to the candidate current threshold probability, the preset lightning strike event ratio and the distribution line parameters, and to perform safety protection on the distribution lines in the area to be processed according to the arrester abnormality probability.

9. An electronic device, characterized in that: include: one or more processors; A memory for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement a power distribution line safety protection method as described in any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, a power distribution line safety protection method as described in any one of claims 1 to 7 is implemented.

Images