Protector configuration method based on cable electromagnetic transient characteristics and related device

Abstract

The invention provides a protector configuration method based on cable electromagnetic transient characteristics and a related device, and belongs to the field of protector configuration. Comprising the following steps: based on the structure and physical parameters of a to-be-configured cable, obtaining series and parallel matrixes in a branch form as a cable conductor parameter matrix; according to the parameter matrix and the line length, determining a transverse voltage drop association relationship between the cable core and the sheath, and calculating sheath current and induced voltage by combining given cable core current and voltage; simulating the to-be-configured cable in a preset overvoltage scene to obtain sheath current and induced voltage simulation values; based on the calculated value and the simulation value, correcting the sheath current and the induced voltage by using a pre-trained neural network model; and determining transient parameters of the cable sheath in the overvoltage scene by using the correction value, and further determining model selection parameters and a connection mode of the protector to complete configuration of the protector. According to the invention, the problem of inaccurate configuration parameters of the existing protector is solved, and the transient overvoltage resistance of the cable is effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of protector configuration technology, specifically relating to a protector configuration method and related apparatus based on the electromagnetic transient characteristics of cables. Background Technology

[0002] In today's ever-advancing power industry, the construction and optimization of power transmission networks have become crucial for ensuring a stable power supply. As an important component of the power transmission network, cables have a profound impact on the reliability and efficiency of the entire power system through their performance and application range.

[0003] Compared to overhead power lines, cable transmission exhibits numerous significant advantages. It possesses strong resistance to severe weather, enabling stable power transmission under complex climatic conditions and significantly improving power supply reliability. Its space-saving characteristics make power deployment more convenient in urban and other areas with limited space, allowing for a wide range of applications. Simultaneously, cable transmission effectively reduces the risk of electric shock, offering higher safety. It also produces less visual pollution and electromagnetic interference, minimizing its environmental impact. Furthermore, it boasts good long-term operational stability and lower maintenance costs, thus finding widespread application in various specialized scenarios.

[0004] However, cables inevitably encounter various faults during actual operation, leading to transient overvoltage problems. Transient overvoltages include several types, such as single-phase grounding faults, overvoltages caused by closing operations, and overvoltages caused by lightning strikes. These overvoltages can cause irreparable damage to cable lines. Although there are currently methods to use sheath protectors to address overvoltages, there are deficiencies in the configuration of these protectors, making it difficult to accurately determine their configuration parameters, thus hindering the effective improvement of the cable line's ability to withstand transient overvoltages. Summary of the Invention

[0005] In view of this, the present invention provides a method and related apparatus for configuring a protector based on the electromagnetic transient characteristics of cables, aiming to determine the configuration parameters of the protector as accurately as possible, and to provide guidance for improving the resistance of cable lines to transient overvoltages.

[0006] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0007] In a first aspect, the present invention provides a method for configuring a protector based on the electromagnetic transient characteristics of a cable, comprising the following steps:

[0008] Based on the structure and physical parameters of the cable to be configured, the series impedance matrix and parallel admittance matrix of the branch form are obtained, and used as the parameter matrix of the cable conductor;

[0009] The lateral voltage drop relationship between the cable core and the sheath is determined based on the parameter matrix and the line length. The lateral voltage drop relationship is then combined with the given cable core current and cable core voltage to obtain the calculated values ​​of the cable sheath current and sheath induced voltage.

[0010] The cable to be configured is simulated under a preset overvoltage scenario to obtain the simulated values ​​of sheath current and sheath induced voltage under each scenario.

[0011] Based on the calculated and simulated values, the corrected sheath current and sheath induced voltage values ​​are obtained using a pre-trained neural network model.

[0012] By using the corrected sheath current and sheath induced voltage values, the sheath transient parameters of the cable under overvoltage scenarios are determined, and the selection parameters of the protector and the protector connection method adapted to each overvoltage scenario are determined based on the sheath transient parameters, thereby completing the protector configuration.

[0013] Furthermore, based on the structure and physical parameters of the cable to be configured, the series impedance matrix and parallel admittance matrix of the branch form are obtained, including:

[0014] Based on the structure and physical parameters of the cable to be configured, the loop current equation is constructed and the capacitance values ​​of the main insulation and the outer insulation are calculated.

[0015] The loop impedance matrix is ​​obtained by calculating the loop self-impedance and mutual impedance based on the loop current equation.

[0016] The loop impedance matrix is ​​transformed by row and column operations to obtain the series impedance matrix in branch form.

[0017] Based on the capacitance values ​​of the main insulation and the external insulation, a loop admittance matrix is ​​constructed and row and column transformations are performed to obtain a parallel admittance matrix in the form of a branch.

[0018] Furthermore, the structural and physical parameters of the cable to be configured include:

[0019] The dimensional parameters, material parameters, and electrical parameters of each layer of the coaxial cable structure; among which, the dimensional parameters include the outer sheath radius of the cable core, the inner sheath radius of the sheath, and the outer sheath radius of the sheath; the material parameters include the relative permittivity of the main insulation material and the relative permittivity of the outer insulation material; the electrical parameters include the impedance per unit length of the outer sheath of the cable core, the reactance per unit length of the main insulation, the impedance per unit length of the inner sheath of the sheath, the mutual impedance per unit length between the inner and outer sheaths of the sheath, the impedance per unit length of the outer sheath of the sheath, the reactance per unit length of the outer insulation, and the ground return impedance.

[0020] Furthermore, based on the parameter matrix and line length, the lateral voltage drop relationship between the cable core and sheath is determined, and the calculated values ​​of sheath current and sheath induced voltage are obtained by combining the given cable core current and cable core voltage, including:

[0021] Obtain the actual line length data of the cable to be configured, and decompose the parameter matrix into the cable core self-impedance matrix, the cable core-sheath mutual impedance matrix, and the sheath self-impedance matrix;

[0022] Using the line length as the voltage drop accumulation coefficient, the lateral voltage drop correlation between the cable core and the sheath is obtained based on the cable core self-impedance matrix, the cable core-sheath mutual impedance matrix, and the sheath self-impedance matrix.

[0023] Substituting the given core current and core voltage into the lateral voltage drop correlation, the sheath current variable is separated by solving the equation, and the numerical result of the sheath current is calculated.

[0024] Based on the numerical results of the sheath current and combined with the correlation of transverse voltage drop, the calculated value of the cable sheath induced voltage is further obtained.

[0025] Furthermore, simulations are performed on the cable to be configured under preset overvoltage scenarios to obtain simulated values ​​of sheath current and sheath induced voltage for each scenario, including:

[0026] Three typical overvoltage scenarios are preset: single-phase ground fault scenario, closing operation overvoltage scenario, and lightning surge intrusion overvoltage scenario.

[0027] Obtain the scenario simulation parameters of the cable to be configured under three typical overvoltage scenarios, and build a simulation model based on the scenario simulation parameters;

[0028] Simulation models under three typical overvoltage scenarios were run, and the sheath current time series data and sheath induced voltage time series data of the simulation output under each scenario were extracted. The feature values ​​were selected as the simulated values ​​of sheath current and sheath induced voltage for each scenario.

[0029] Furthermore, the modified sheath current and sheath induced voltage values ​​are used to determine the sheath transient parameters of the cable under overvoltage scenarios, including:

[0030] For the corrected sheath current and sheath induced voltage values ​​under various scenarios, extract the voltage peak value, current peak value, and maximum power frequency overvoltage value;

[0031] The transient parameters of the sheath are determined based on the peak voltage, peak current, and maximum power frequency overvoltage.

[0032] Furthermore, the selection parameters include rated voltage, initial operating voltage, residual voltage, power frequency withstand voltage, and current capacity.

[0033] Secondly, the present invention provides a protector configuration device based on the electromagnetic transient characteristics of cables, comprising:

[0034] The parameter matrix determination module is used to obtain the series impedance matrix and parallel admittance matrix of the branch form based on the structural and physical parameters of the cable to be configured, and use them as the parameter matrix of the cable conductor.

[0035] The calculation module is used to determine the lateral voltage drop relationship between the cable core and the sheath based on the parameter matrix and the line length, and to combine the lateral voltage drop relationship with the given cable core current and cable core voltage to obtain the calculated values ​​of the cable sheath current and sheath induced voltage.

[0036] The simulation module is used to simulate the cable to be configured under preset overvoltage scenarios to obtain the simulated values ​​of sheath current and sheath induced voltage under each scenario.

[0037] The correction module is used to obtain corrected sheath current and sheath induced voltage values ​​based on calculated and simulated values ​​using a pre-trained neural network model.

[0038] The configuration determination module is used to determine the sheath transient parameters of the cable under overvoltage scenarios by using the corrected sheath current and sheath induced voltage values, and to determine the selection parameters of the protector and the protector connection method adapted to each overvoltage scenario based on the sheath transient parameters, thereby completing the protector configuration.

[0039] Thirdly, the present invention provides a computer device, the device including a processor and a memory:

[0040] The memory is used to store computer programs and send the instructions of the computer programs to the processor;

[0041] The processor executes, according to the instructions of the computer program, a protector configuration method based on the electromagnetic transient characteristics of a cable, as described in the first aspect.

[0042] Fourthly, the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements a protector configuration method based on the electromagnetic transient characteristics of a cable as described in the first aspect.

[0043] In summary, this invention provides a protector configuration method and related apparatus based on the electromagnetic transient characteristics of cables. The method includes: obtaining the series impedance matrix and parallel admittance matrix of the branch form based on the structure and physical parameters of the cable to be configured, and using these as the parameter matrix of the cable conductor; determining the lateral voltage drop correlation between the cable core and sheath based on the parameter matrix and the line length, and combining the lateral voltage drop correlation with the given cable core current and cable core voltage to obtain calculated values ​​of the sheath current and sheath induced voltage; simulating the cable to be configured under preset overvoltage scenarios to obtain simulated values ​​of the sheath current and sheath induced voltage under each scenario; obtaining corrected sheath current and sheath induced voltage values ​​using a pre-trained neural network model based on the calculated and simulated values; determining the sheath transient parameters of the cable under overvoltage scenarios using the corrected sheath current and sheath induced voltage values, and determining the protector selection parameters and protector connection methods suitable for each overvoltage scenario based on the sheath transient parameters, thereby completing the protector configuration. This invention solves the problem of inaccurate configuration parameters of existing protectors by constructing a matrix based on cable structure and physical parameters, calculating and simulating to correct sheath parameters, and then determining the protector selection and connection method, thereby effectively improving the cable's ability to withstand transient overvoltages. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 A flowchart illustrating a protector configuration method based on the electromagnetic transient characteristics of a cable, provided as an embodiment of the present invention;

[0046] Figure 2 A schematic diagram of the distributed admittance current of a single-core terrestrial cable provided in an embodiment of the present invention;

[0047] Figure 3 A typical circuit topology diagram with double-ended grounding provided for embodiments of the present invention;

[0048] Figure 4 This is a three-phase sheath equivalent circuit model diagram provided in an embodiment of the present invention;

[0049] Figure 5 A block diagram of a protection device configuration apparatus based on the electromagnetic transient characteristics of a cable provided in an embodiment of the present invention;

[0050] Figure 6 This is a block diagram of a computer device provided in an embodiment of the present invention. Detailed Implementation

[0051] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0052] The background of this invention will be described in detail below.

[0053] With the continuous development of the power industry, cables have become an indispensable part of modern power transmission networks. Compared with overhead transmission lines, cable transmission has stronger resistance to severe weather and higher reliability; saves ground space and has a wider range of applications; reduces the risk of electric shock and is safer; has less visual pollution, lower electromagnetic interference, and less environmental impact; and has better long-term stability and lower maintenance costs. Therefore, cables are widely used in various special scenarios.

[0054] However, cables inevitably encounter faults during operation, leading to transient overvoltages. Transient overvoltages on cable transmission lines include: single-phase grounding faults, overvoltages caused by closing operations, and overvoltages caused by lightning strikes. Overvoltage faults can cause irreversible damage to cable lines. Single-phase grounding faults are relatively common in power systems. If a single-phase grounding fault occurs in a cable, a high overvoltage will be induced at the crossover point, threatening the safe and stable operation of the transmission system. Overvoltages caused by closing operations occur when the line is switched on or when the operating mode is changed. Insufficient arc-extinguishing performance of the circuit breaker leading to arc reignition is the root cause of overvoltages. Transmission cables are generally laid by direct burial in soil, trench laying, or tunnel laying, so cable lines are rarely affected by direct lightning strikes. However, the phenomenon of lightning waves intruding along overhead lines into cables and causing a rise in sheath potential occurs frequently; this is the overvoltage caused by lightning strikes.

[0055] Therefore, it is necessary to install sheath protectors at critical locations in cable lines to prevent high overvoltages induced at cross-connections. Sheath protectors, through their non-linear resistance characteristics, can quickly limit the overvoltage amplitude between the metallic sheath and ground, discharge transient currents caused by lightning or faults, and prevent sheath insulation breakdown or burnout of cross-connections. Their installation requires consideration of parameters such as system voltage level, cable laying method, and lightning activity intensity, with appropriate selection and optimized grounding design to effectively suppress overvoltage damage to the cable sheath and main insulation, ensure the reliability of insulation coordination in the transmission system, and extend cable service life.

[0056] To address the existing problems with line protector configuration, this invention provides a protector configuration and related devices based on the electromagnetic transient characteristics of cables, which will be described in detail below with reference to some embodiments.

[0057] Please see Figure 1 This invention provides a method for configuring a protector based on the electromagnetic transient characteristics of a cable, comprising the following steps:

[0058] S11: Based on the structure and physical parameters of the cable to be configured, obtain the series impedance matrix and parallel admittance matrix of the branch form, and use them as the parameter matrix of the cable conductor.

[0059] It should be noted that structural and physical parameters include basic parameters such as the dimensions of the coaxial cable structure (e.g., core radius, sheath thickness), material properties (e.g., dielectric constant of insulation material), and electrical characteristics (e.g., impedance per unit length, reactance).

[0060] The series impedance matrix is ​​a matrix that describes the series impedance relationship between cable conductors (core and sheath) and reflects the voltage loss characteristics when current flows through it.

[0061] The parallel admittance matrix is ​​a matrix that describes the parallel admittance relationship between conductors and reflects the current shunting characteristics generated by the capacitance and conductance between conductors.

[0062] Branch configuration is a parameter expression that breaks down the overall electrical characteristics of a cable into multiple independent branches (such as core branches and sheath branches), which facilitates circuit analysis.

[0063] This step involves calculating the self-impedance and mutual impedance (reflecting current coupling) between conductors using the cable's structural parameters (such as dimensions) and physical parameters (such as material dielectric constant and conductivity), forming a loop impedance matrix. Then, the loop admittance matrix is ​​calculated using the insulation layer capacitance value. Finally, the loop matrix is ​​transformed into a series impedance matrix and a parallel admittance matrix in branch form through row and column transformations, thus achieving mathematical modeling of the cable's electromagnetic characteristics.

[0064] S12: Determine the lateral voltage drop relationship between the cable core and the sheath based on the parameter matrix and the line length, and combine the lateral voltage drop relationship with the given cable core current and cable core voltage to obtain the calculated values ​​of the cable sheath current and sheath induced voltage.

[0065] It should be noted that the lateral voltage drop correlation is the voltage drop coupling relationship between the cable core and the sheath caused by electromagnetic induction, reflecting the mutual influence of their voltage and current.

[0066] Sheath current is the current induced in the cable sheath under overvoltage conditions, and it is an indicator for assessing the electromagnetic stress that the sheath can withstand.

[0067] Sheath induced voltage is the voltage generated on the sheath through electromagnetic induction when the current in the cable core changes.

[0068] This step can combine the parameter matrix obtained in step S11 and the actual cable length, multiply the impedance and admittance parameters by the length (simulating the cumulative effect of the line), establish the voltage-current coupling equation (lateral voltage drop correlation) between the cable core and the sheath; substitute the known cable core current and voltage (which can be obtained through measurement or preset), solve the equation to obtain the theoretical calculated values ​​of the sheath current and induced voltage, and realize the preliminary quantification of the electromagnetic response of the sheath.

[0069] S13: Simulate the cable to be configured under preset overvoltage scenarios to obtain the simulated values ​​of sheath current and sheath induced voltage under each scenario.

[0070] It should be noted that the preset overvoltage scenario simulates transient overvoltage types that may occur in actual operation, such as single-phase grounding faults, closing operation overvoltages, and lightning surge intrusion.

[0071] The simulation values ​​are the sheath current and induced voltage data output by simulation software when simulating an overvoltage scenario.

[0072] This step involves building a simulation model based on the cable parameter matrix to simulate the occurrence of three typical overvoltage scenarios. The transient electromagnetic equations are solved using simulation software, and the curves of sheath current and induced voltage changing over time (time series data) are output. The peak value, RMS value, and other characteristic values ​​in the curves are extracted as simulation results.

[0073] S14: Based on the calculated and simulated values, the corrected sheath current and sheath induced voltage values ​​are obtained using a pre-trained neural network model.

[0074] It should be noted that pre-trained neural network models are machine learning models trained with a large amount of historical data (such as existing calculated values, simulation values ​​and deviations from actual measured values), which can correct the deviations between theoretical values ​​and simulation values.

[0075] The correction values ​​are the sheath current and induced voltage data that are closer to the actual working conditions, obtained by fusing calculated values ​​and simulated values ​​through a neural network.

[0076] S15: Using the corrected sheath current and sheath induced voltage values, determine the sheath transient parameters of the cable under overvoltage scenarios, and based on the sheath transient parameters, determine the selection parameters of the protector and the protector connection method adapted to each overvoltage scenario, thereby completing the protector configuration.

[0077] It should be noted that the sheath transient parameters are the transient characteristic quantities of sheath current and voltage under overvoltage scenarios.

[0078] Selection parameters are key performance indicators of protectors, such as rated voltage, current capacity, and residual voltage.

[0079] This step can extract sheath transient parameters (such as peak voltage and peak current) from the correction value in step S14, and determine the selection parameters of the protector based on these parameters (such as the rated voltage needing to be greater than the peak transient voltage); at the same time, according to the characteristics of different overvoltage scenarios (such as the high-frequency characteristics of lightning waves and the power frequency component of closing overvoltage), select the appropriate protector connection method, and finally complete the accurate protector configuration.

[0080] This embodiment provides a protector configuration method based on the electromagnetic transient characteristics of cables. This method overcomes the error defects of single methods by integrating theoretical calculations and multi-scenario simulation data and introducing a neural network correction mechanism, effectively improving the calculation accuracy of sheath current and induced voltage. Finally, based on the corrected transient parameters, the method achieves scenario-based adaptation of protector selection and connection mode, enabling the protector to specifically resist different types of transient overvoltages and significantly improving the protection performance of cable lines.

[0081] In one embodiment of the present invention, based on the structure and physical parameters of the cable to be configured, the series impedance matrix and parallel admittance matrix in the form of branches are obtained, including:

[0082] S21: Based on the structure and physical parameters of the cable to be configured, the loop current equation is constructed and the capacitance values ​​of the main insulation and the outer insulation are calculated;

[0083] Taking a coaxial cable structure as an example, a loop current equation reflecting the relationship between conductor current and impedance is constructed, and its expression is:

[0084] (1)

[0085] In the formula, and This represents the voltage between loop 1 and loop 2. This represents the self-impedance of loop 1; This represents the mutual impedance between loop 1 and loop 2; This represents the self-impedance of loop 2. and This represents the current in loop 1 and loop 2. Loop 1 and loop 2 are two independent current loops formed between the cable conductor (core, sheath) and the ground.

[0086] The capacitance calculation formula for a coaxial dielectric is as follows:

[0087] (2)

[0088] In the formula, Indicates the capacitance value. Represents the vacuum permittivity; represents the relative permittivity of the material; r represents the outer radius of the coaxial structure; q represents the inner radius of the coaxial structure. The corresponding capacitance values ​​are calculated by substituting the parameters of the main insulation (between the cable core and sheath) and the outer insulation (between the sheath and ground).

[0089] S22: Calculate the loop self-impedance and mutual impedance based on the loop current equation to obtain the loop impedance matrix.

[0090] Based on the electrical parameters of the cable to be configured, and combined with the physical meaning of self-impedance and mutual impedance in the loop current equation, the following formulas are used to calculate the impedance values:

[0091] (3)

[0092] (4)

[0093] (5)

[0094] In the formula, This indicates the impedance per unit length of the cable core's outer sheath; Indicates the reactance per unit length of the main insulation; This represents the impedance per unit length of the inner skin layer; This indicates the mutual impedance per unit length between the inner and outer skin layers of the protective layer; This indicates the impedance per unit length of the outer skin of the protective layer; Indicates reactance per unit length of external insulation; This indicates the ground return impedance.

[0095] S23: Perform row and column transformations on the loop impedance matrix to obtain the series impedance matrix in branch form.

[0096] After calculating the impedances of each component in the circuit, the impedance matrix in equation (1) is transformed by the row and column transformation shown in equation (6) to obtain the series impedance matrix in branch form as follows:

[0097] (6)

[0098] In the formula, This represents the series impedance matrix.

[0099] S24: Based on the capacitance values ​​of the main insulation and the external insulation, construct the loop admittance matrix and perform row and column transformations to obtain the parallel admittance matrix in the form of branches.

[0100] The calculation of the parallel admittance matrix is ​​simpler. When the parallel admittance is ignored, the capacitance values ​​of the main insulation and the external insulation are calculated separately to obtain the admittance matrix in the form of a loop. By performing the row and column transformation shown in equation (7) on the admittance matrix in the form of a loop, the parallel admittance matrix in the form of a branch is obtained as follows:

[0101] (7)

[0102] In the formula, This is the parallel admittance matrix.

[0103] In this embodiment, based on the structure and physical parameters of the cable to be configured (such as dimensions, material dielectric constant, conductivity, etc.), a loop current equation reflecting the current conduction law of the cable conductor is first constructed using electromagnetic theory. At the same time, the capacitance values ​​of the main insulation (between the cable core and the sheath) and the outer insulation (between the sheath and the ground) are calculated according to the insulation layer size and material dielectric constant. Then, based on the loop current equation, a loop impedance matrix describing the overall impedance characteristics of the loop is constructed by analyzing the impedance generated by the current of the conductor itself (self-impedance) and the impedance generated by the current coupling between different conductors (mutual impedance). Then, through matrix row and column transformation, the impedance relationship at the loop level is transformed into a branch form series impedance matrix that better meets the needs of circuit analysis. Finally, based on the calculated capacitance values ​​of the main and outer insulation, a loop admittance matrix reflecting the current shunting characteristics between loops is constructed. Similarly, a branch form parallel admittance matrix is ​​obtained through row and column transformation. Its function is to transform the complex electromagnetic characteristics of cables into a mathematical and branched parameter matrix, laying the foundation for subsequent accurate calculation of the lateral voltage drop relationship between the cable core and the sheath, and analysis of the electrical response of cables under transient overvoltage. It solves the problem that traditional parameter modeling is difficult to accurately reflect the distributed electromagnetic coupling characteristics of cables.

[0104] In a further embodiment of the present invention, the structural and physical parameters of the cable to be configured include:

[0105] The dimensional parameters, material parameters, and electrical parameters of each layer of the coaxial cable structure; among which, the dimensional parameters include the outer sheath radius of the cable core, the inner sheath radius of the sheath, and the outer sheath radius of the sheath; the material parameters include the relative permittivity of the main insulation material and the relative permittivity of the outer insulation material; the electrical parameters include the impedance per unit length of the outer sheath of the cable core, the reactance per unit length of the main insulation, the impedance per unit length of the inner sheath of the sheath, the mutual impedance per unit length between the inner and outer sheaths of the sheath, the impedance per unit length of the outer sheath of the sheath, the reactance per unit length of the outer insulation, and the ground return impedance.

[0106] In one embodiment of the present invention, the lateral voltage drop relationship between the cable core and the sheath is determined based on the parameter matrix and the line length, and the calculated values ​​of the sheath current and the sheath induced voltage are obtained by combining the given cable core current and cable core voltage, including:

[0107] S31: Obtain the actual line length data of the cable to be configured, and decompose the parameter matrix into the cable core self-impedance matrix, the cable core-sheath mutual impedance matrix, and the sheath self-impedance matrix.

[0108] Obtain the actual laying length data of the cable to be configured (e.g., a 500kV dual-circuit single-core land cable), denoted as L. The cable core self-impedance matrix is ​​denoted as Z. C The submatrix in the corresponding branch matrix only describes the impedance characteristics of the cable core itself, reflecting the voltage drop caused by the cable core current passing through its own impedance; the cable core-sheath mutual impedance matrix is ​​denoted as Z. M The submatrix in the corresponding branch matrix describes the electromagnetic coupling effect between the cable core and the sheath, reflecting the characteristic that the cable core current generates a voltage drop in the sheath through mutual inductance; the sheath self-impedance matrix is ​​denoted as Z. S The submatrix in the corresponding branch matrix only describes the impedance characteristics of the sheath itself, reflecting the voltage drop generated by the sheath current passing through its own impedance.

[0109] Taking a three-phase cable (with core phases a, b, and c, and sheath phases x, y, and z) as an example, the disassembled matrix is ​​a 6th-order matrix.

[0110] S32: Using the line length as the voltage drop accumulation coefficient, based on the cable core self-impedance matrix, the cable core-sheath mutual impedance matrix, and the sheath self-impedance matrix, the lateral voltage drop correlation between the cable core and the sheath is obtained.

[0111] The transverse voltage drop of each conductor can be expressed by equation (8).

[0112] (8)

[0113] In the formula, L represents the line length, and the voltage drop vector on the left side of the equation can be considered as consisting of two parts: the cable core voltage drop vector ΔU. C and the sheath voltage drop vector ΔU S Similarly, the current vector on the right side of the equation can also be considered as consisting of two parts: the cable core current vector I. C and sheath current vector I S This matrix can be decomposed into four third-order submatrices: I C Through the cable core self-impedance matrix Z in the upper left corner C A voltage drop is generated on the cable core, and simultaneously through the cable core-sheath mutual impedance matrix Z in the lower left corner. M A voltage drop is generated on the sheath; the submatrices in the upper right and lower left corners are transposes of each other, and their function is to couple I. S This causes a voltage drop on the sheath; finally, I S Through the sheath self-impedance matrix Z in the lower right corner S A voltage drop occurs on the protective layer.

[0114] Therefore, the transverse voltage drop between the cable core and the sheath can be expressed as follows:

[0115] (9)

[0116] In the formula, for The transpose of .

[0117] S33: Substitute the given core current and core voltage into the lateral voltage drop correlation, solve the equation to separate the sheath current variable, and calculate the numerical result of the sheath current.

[0118] For transmission lines that are actually in operation, their steady-state power flow information is generally known, so the core voltage U can be assumed to be... c and core current I c Since this is a known quantity, we only need to determine the sheath current I. s The induced voltage of the sheath can then be calculated.

[0119] like Figure 2 As shown, Figure 2 A schematic diagram of the distributed admittance current of a single-core land cable is given. Since there is distributed admittance current between the cable core and the sheath, and between the sheath and the ground within a phase, the sheath current Is is not actually a constant, but a variable related to the axial position l. After simplification, equation (10) can be obtained:

[0120] (10)

[0121] in, For voltage drop vector, For mutual impedance matrix, For conductor current vector, It is the self-impedance matrix. The initial system current vector, Let be the admittance matrix. For conductor voltage vector, This is the current vector of the midpoint system.

[0122] From equation (10), we can derive a conclusion: for a single-core land cable direct connection line, the transverse voltage drop of the sheath can be directly calculated in the form of equation (9) using the sheath current value at the midpoint of the line.

[0123] Figure 3 A typical circuit topology with both ends grounded is given. Based on the topology diagram, write the following KVL (Kirchhoff's Voltage Law) equations:

[0124] (11)

[0125] (12)

[0126] (13)

[0127] In the formula, This is the total impedance matrix. The total impedance of the grounding loop. The system's starting resistance, For system terminating resistor, Let the system's initial contact resistance vector be denoted as . The system terminal contact resistance vector, ones(n) represents an n-order square matrix with all elements being 1; diag(β) represents a diagonal matrix with vector β as the main diagonal element.

[0128] Figure 4 The equivalent circuit model of the three-phase sheath is given, and equation (11) can be rewritten as equation (14):

[0129] (14)

[0130] Furthermore, the sheath-to-ground induced current value at a distance l from the beginning of the single-core terrestrial cable can be derived:

[0131] (15)

[0132] S34: Based on the numerical results of the sheath current and combined with the correlation of transverse voltage drop, the calculated value of the cable sheath induced voltage is further obtained.

[0133] Similarly, the sheath-to-ground induced current value at a distance l from the beginning of the single-core land cable can be derived:

[0134] (16)

[0135] This embodiment uses mathematical modeling and circuit analysis to accurately calculate the theoretical values ​​of sheath current and induced voltage, providing reliable basic data for subsequent overvoltage scenario simulation, neural network correction, and final protector configuration, ensuring that the protector parameters match the transient characteristics of the cable.

[0136] In one embodiment of the present invention, the simulation of the cable to be configured under a preset overvoltage scenario is performed to obtain the simulated values ​​of the sheath current and the sheath induced voltage for each scenario, including:

[0137] S41: Three typical overvoltage scenarios are preset: single-phase ground fault scenario, closing operation overvoltage scenario, and lightning surge intrusion overvoltage scenario.

[0138] Single-phase grounding faults are a common type of fault in power systems. During a fault, high overvoltages can be induced at the cable crossover points, threatening system stability. Overvoltages during closing operations occur when lines are switched on or when the operating mode is changed, caused by arc reignition due to insufficient arc extinguishing performance of the circuit breaker. Although the impact of direct lightning strikes is reduced by the cable laying method (direct burial in soil, trench or tunnel laying), lightning surges intruding along overhead lines can still cause the sheath potential to rise.

[0139] S42: Obtain the scenario simulation parameters of the cable to be configured under three typical overvoltage scenarios, and build a simulation model based on the scenario simulation parameters.

[0140] In the event of a single-phase metallic ground fault, the cable's metallic sheath will experience a high-amplitude transient overshoot. After the transient overshoot completely decays, the sheath will transition to the power frequency overvoltage stage. The cable core current Ic passes through the cable core-sheath mutual impedance matrix Z. M An equivalent voltage drop U is generated on the sheath. ss :

[0141] (17)

[0142] In the formula, I gz This represents the faulty phase conductor current. For a three-phase balanced circuit, Z represents the faulty phase conductor current. M The difference between the main diagonal element and the off-diagonal element is very small, Z M All elements in the equation can be approximated as equal values ​​of h. Furthermore, equation (17) can be rewritten as follows:

[0143] (18)

[0144] S43: Run simulation models for three typical overvoltage scenarios, extract the sheath current time series data and sheath induced voltage time series data from the simulation output of each scenario, and select the feature values ​​as the simulated values ​​of sheath current and sheath induced voltage for each scenario.

[0145] Simulation models were launched for the three scenarios respectively. During the simulation, continuous data on the changes of sheath current and sheath induced voltage over time were recorded in real time, forming sheath current time series data (such as the current value every 0.1ms within 0-100ms) and sheath induced voltage time series data. Key feature values ​​were selected from the time series data, including peak sheath current, peak sheath induced voltage (reflecting the maximum impact intensity of transient overvoltage), and maximum power frequency overvoltage (used to determine selection parameters such as the rated voltage of the protector).

[0146] This embodiment is based on common transient overvoltage types in cable operation, and presets three scenarios: single-phase grounding fault, closing operation overvoltage, and lightning surge intrusion. It obtains the basic cable parameters and specific simulation parameters for each scenario, uses simulation software to build a simulation model, runs the model to obtain time series data of sheath current and induced voltage, and selects characteristic values ​​such as peak value and power frequency maximum value as simulation values. Its function is to reproduce the electromagnetic transient response of the cable under actual overvoltage scenarios through simulation and obtain simulation data of sheath parameters.

[0147] In one embodiment of the present invention, the sheath transient parameters of the cable under an overvoltage scenario are determined using the modified sheath current and sheath induced voltage values, including:

[0148] For the corrected sheath current and sheath induced voltage values ​​under various scenarios, extract the voltage peak value, current peak value, and maximum power frequency overvoltage value;

[0149] The transient parameters of the sheath are determined based on the peak voltage, peak current, and maximum power frequency overvoltage.

[0150] This embodiment addresses the sheath current and induced voltage values ​​after neural network correction under three scenarios: single-phase grounding fault, closing operation overvoltage, and lightning surge intrusion. Three key indicators are extracted: first, peak voltage, which is the maximum value in the corrected sheath induced voltage time series, reflecting the maximum impact intensity of the overvoltage scenario on the sheath insulation; second, peak current, which is the maximum value in the corrected sheath current time series, reflecting the transient current limit that the sheath needs to discharge; and third, the maximum power frequency overvoltage, which refers to the stable maximum overvoltage value of the sheath entering the power frequency stage after the instantaneous overshoot decays in the single-phase grounding fault scenario. Subsequently, sheath transient parameters are determined based on these three indicators.

[0151] In one embodiment of the present invention, the selection parameters include rated voltage, initial operating voltage, residual voltage, power frequency withstand voltage, and current carrying capacity. The determination of each selection parameter is described below:

[0152] (1) Rated voltage U r :U r The maximum power frequency overvoltage U of the cable sheath during a short circuit can be obtained. p To determine this, generally we can take U. r =U p / K, where K is the power frequency overvoltage coordination coefficient, which can be taken as 1.1~1.3.

[0153] (2) Initial operating voltage U 1ma :U 1ma It is the starting voltage for the sheath protector to switch from a high-resistance state to a low-resistance state, usually expressed as U. 1ma = U r Value; in addition, the sheath protector should reliably operate when the sheath overvoltage amplitude may exceed the external insulation voltage withstand capability, therefore U 1ma It should be less than the power frequency voltage withstand value of the cable's external insulation.

[0154] (3) Residual pressure U res :U res This characterizes the clamping potential of the sheath protector after it has tripped. Typically, it is 1.4 times U when the protector carries the maximum inrush current. resIts value should be less than the impulse voltage withstand value of the cable's outer insulation.

[0155] (4) Power frequency withstand voltage U R The sheath protector needs to be installed in U... R It can withstand the force for 5 seconds without damage. From the power frequency voltage withstand characteristic curve of the gapless ZnO valve plate, it can be seen that at t=5s, U / U r ≈1.15, therefore the power frequency withstand voltage should meet U R >1.15U r .

[0156] (5) Current capacity I m :I m This refers to the maximum pulse current that the sheathing protector can absorb without damage. The current-carrying capacity I of a 500kV sheathing protector. m It should be greater than 21.6 kA.

[0157] Taking a 500kV dual-circuit system as an example, the parameters of the system's protectors are determined.

[0158] For a 500kV double-circuit single-core land cable model, the maximum power frequency overvoltage U of the cable sheath during a short-circuit accident is... p =9kV, taking the power frequency overvoltage coordination factor K=1.2, then the rated voltage U of the sheath protector is... r It should be greater than 7.5kV. Furthermore, the initial operating voltage can be set according to U... 1ma = The value of U should be chosen so that it can reliably operate when the overvoltage amplitude of the sheath may exceed the voltage withstand capability of the external insulation. Based on the structure of the ZB-YJLW02-Z-290 / 500kV 1×2500mm2 high-voltage cable, the 60-minute power frequency withstand voltage of the external insulation can be calculated to be approximately 57.5kV. From the above analysis, it can be seen that U 1mA It should be greater than 10.6kV and less than 57.5kV. At this time, the parameter requirements for the sheath protector of the 500kV double-circuit system are: rated voltage greater than 7.5kV, starting operating voltage between 10.6kV and 57.5kV, residual voltage less than 51.8kV, power frequency withstand voltage greater than 8.625kV, and current carrying capacity greater than 21.6kV.

[0159] Based on the same inventive concept, this application also provides a protector configuration device based on cable electromagnetic transient characteristics for implementing the above-mentioned protector configuration method based on cable electromagnetic transient characteristics. The solution provided by this device is similar to the implementation described in the above-described method. Therefore, the specific limitations in the embodiments of the protector configuration device based on cable electromagnetic transient characteristics provided below can be found in the limitations of the protector configuration method based on cable electromagnetic transient characteristics described above, and will not be repeated here.

[0160] Please see Figure 5 This invention also provides a protector configuration device based on the electromagnetic transient characteristics of cables, comprising:

[0161] The parameter matrix determination module is used to obtain the series impedance matrix and parallel admittance matrix of the branch form based on the structural and physical parameters of the cable to be configured, and use them as the parameter matrix of the cable conductor.

[0162] The calculation module is used to determine the lateral voltage drop relationship between the cable core and the sheath based on the parameter matrix and the line length, and to combine the lateral voltage drop relationship with the given cable core current and cable core voltage to obtain the calculated values ​​of the cable sheath current and sheath induced voltage.

[0163] The simulation module is used to simulate the cable to be configured under preset overvoltage scenarios to obtain the simulated values ​​of sheath current and sheath induced voltage under each scenario.

[0164] The correction module is used to obtain corrected sheath current and sheath induced voltage values ​​based on calculated and simulated values ​​using a pre-trained neural network model.

[0165] The configuration determination module is used to determine the sheath transient parameters of the cable under overvoltage scenarios by using the corrected sheath current and sheath induced voltage values, and to determine the selection parameters of the protector and the protector connection method adapted to each overvoltage scenario based on the sheath transient parameters, thereby completing the protector configuration.

[0166] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the system can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0167] Reference Figure 6 The present invention also provides a computer device, including: a memory and a processor, and a computer program stored in the memory, wherein when the computer program is executed on the processor, it implements the protector configuration method based on the electromagnetic transient characteristics of cables as described in any of the above methods.

[0168] The computer device may be a desktop computer, laptop, handheld computer, or cloud server, etc. This computer device may include, but is not limited to, a processor and memory. Those skilled in the art will understand that... Figure 6 The examples of computer devices are merely examples and do not constitute a limitation on computer devices. They may include more or fewer components than shown in the illustration, or combinations of certain components, or different components. For example, they may also include input / output devices, network access devices, etc.

[0169] The processor referred to can be a Central Processing Unit (CPU), but it can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0170] In some embodiments, the memory may be an internal storage unit of the computer device, such as a hard drive or RAM. In other embodiments, the memory may be an external storage device of the computer device, such as a plug-in hard drive, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card. Furthermore, the memory may include both internal and external storage units of the computer device. The memory is used to store the operating system, applications, boot loader, data, and other programs, such as the program code of the computer program. The memory can also be used to temporarily store data that has been output or will be output.

[0171] This invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the protector configuration method based on the electromagnetic transient characteristics of cables as described in any of the above methods.

[0172] In this embodiment, if the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include at least: any entity or device capable of carrying computer program code to a photographing device / terminal device, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium. Examples include USB flash drives, portable hard drives, magnetic disks, or optical disks. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electrical carrier signals or telecommunication signals.

[0173] This invention provides a computer program product, including a computer program that, when executed by a processor, implements a protector configuration method based on the electromagnetic transient characteristics of cables as described in any of the above methods.

[0174] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0175] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0176] In the embodiments disclosed in this application, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0177] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for configuring a protector based on the electromagnetic transient characteristics of a cable, characterized in that, Includes the following steps: Based on the structure and physical parameters of the cable to be configured, the series impedance matrix and parallel admittance matrix of the branch form are obtained, and used as the parameter matrix of the cable conductor; Based on the parameter matrix and line length, the lateral voltage drop relationship between the cable core and the sheath is determined, and the lateral voltage drop relationship is combined with the given cable core current and cable core voltage to obtain the calculated values ​​of the cable sheath current and sheath induced voltage. The cable to be configured is simulated under a preset overvoltage scenario to obtain the simulated values ​​of sheath current and sheath induced voltage under each scenario. Based on the calculated values ​​and the simulated values, the corrected sheath current and sheath induced voltage values ​​are obtained using a pre-trained neural network model. Using the corrected sheath current and sheath induced voltage values, the sheath transient parameters of the cable under overvoltage scenarios are determined, and the selection parameters of the protector and the protector connection method adapted to each overvoltage scenario are determined based on the sheath transient parameters, thereby completing the protector configuration.

2. The protector configuration method based on the electromagnetic transient characteristics of cables according to claim 1, characterized in that, Based on the structure and physical parameters of the cable to be configured, the series impedance matrix and parallel admittance matrix of the branch form are obtained, including: Based on the structure and physical parameters of the cable to be configured, the loop current equation is constructed and the capacitance values ​​of the main insulation and the outer insulation are calculated. Based on the loop current equation, the loop self-impedance and mutual impedance are calculated to obtain the loop impedance matrix; Perform a row and column transformation on the loop impedance matrix to obtain a series impedance matrix in branch form; Based on the capacitance values ​​of the main insulation and the external insulation, a loop admittance matrix is ​​constructed and row and column transformations are performed to obtain a parallel admittance matrix in the form of a branch.

3. The method for configuring a protector based on the electromagnetic transient characteristics of a cable according to claim 2, characterized in that, The structural and physical parameters of the cable to be configured include: The cable coaxial structure includes the dimensional parameters, material parameters, and electrical parameters of each layer; wherein, the dimensional parameters include the outer sheath radius of the cable core, the inner sheath radius of the sheath, and the outer sheath radius of the sheath; the material parameters include the relative permittivity of the main insulation material and the relative permittivity of the outer insulation material; the electrical parameters include the impedance per unit length of the outer sheath of the cable core, the reactance per unit length of the main insulation, the impedance per unit length of the inner sheath of the sheath, the mutual impedance per unit length between the inner and outer sheaths of the sheath, the impedance per unit length of the outer sheath of the sheath, the reactance per unit length of the outer insulation, and the ground return impedance.

4. The method for configuring a protector based on the electromagnetic transient characteristics of a cable according to claim 1, characterized in that, Based on the parameter matrix and line length, the lateral voltage drop relationship between the cable core and sheath is determined, and the calculated values ​​of sheath current and sheath induced voltage are obtained by combining the given cable core current and cable core voltage, including: Obtain the actual line length data of the cable to be configured, and decompose the parameter matrix into the cable core self-impedance matrix, the cable core-sheath mutual impedance matrix, and the sheath self-impedance matrix; Using the line length as the voltage drop accumulation coefficient, and based on the cable core self-impedance matrix, the cable core-sheath mutual impedance matrix, and the sheath self-impedance matrix, the lateral voltage drop correlation between the cable core and the sheath is obtained. Substitute the given core current and core voltage into the lateral voltage drop correlation, solve the equation to separate the sheath current variable, and calculate the numerical result of the sheath current. Based on the numerical results of the sheath current, and combined with the aforementioned lateral voltage drop correlation, the calculated value of the cable's sheath induced voltage is further obtained.

5. The method for configuring a protector based on the electromagnetic transient characteristics of a cable according to claim 1, characterized in that, The cable to be configured is simulated under preset overvoltage scenarios to obtain simulated values ​​of sheath current and sheath induced voltage for each scenario, including: Three typical overvoltage scenarios are preset: single-phase ground fault scenario, closing operation overvoltage scenario, and lightning surge intrusion overvoltage scenario. Obtain the scenario simulation parameters of the cable to be configured under three typical overvoltage scenarios, and construct a simulation model based on the scenario simulation parameters; Simulation models under three typical overvoltage scenarios were run, and the sheath current time series data and sheath induced voltage time series data of the simulation output under each scenario were extracted. The feature values ​​were selected as the simulated values ​​of sheath current and sheath induced voltage for each scenario.

6. The protector configuration method based on the electromagnetic transient characteristics of cables according to claim 5, characterized in that, Determining the sheath transient parameters of the cable under overvoltage scenarios using the corrected sheath current and sheath induced voltage values ​​includes: For the corrected sheath current and sheath induced voltage values ​​in various scenarios, extract the voltage peak value, current peak value, and maximum power frequency overvoltage value; The sheath transient parameters are determined based on the voltage peak, current peak, and maximum power frequency overvoltage.

7. The protector configuration method based on the electromagnetic transient characteristics of cables according to claim 6, characterized in that, The selection parameters include rated voltage, initial operating voltage, residual voltage, power frequency withstand voltage, and current carrying capacity.

8. A protection device configuration apparatus based on the electromagnetic transient characteristics of cables, characterized in that, include: The parameter matrix determination module is used to obtain the series impedance matrix and parallel admittance matrix of the branch form based on the structural and physical parameters of the cable to be configured, and use them as the parameter matrix of the cable conductor. The calculation module is used to determine the lateral voltage drop relationship between the cable core and the sheath based on the parameter matrix and the line length, and to combine the lateral voltage drop relationship with the given cable core current and cable core voltage to obtain the calculated values ​​of the cable sheath current and sheath induced voltage. The simulation module is used to simulate the cable to be configured under preset overvoltage scenarios to obtain the simulated values ​​of sheath current and sheath induced voltage under each scenario. The correction module is used to obtain the corrected sheath current and sheath induced voltage values ​​based on the calculated values ​​and the simulated values ​​using a pre-trained neural network model. The configuration determination module is used to determine the sheath transient parameters of the cable under overvoltage scenarios using the corrected sheath current and sheath induced voltage values, and to determine the selection parameters of the protector and the protector connection method adapted to each overvoltage scenario based on the sheath transient parameters, thereby completing the protector configuration.

9. A computer device, characterized in that, The device includes a processor and a memory: The memory is used to store computer programs and send the instructions of the computer programs to the processor; The processor executes, according to the instructions of the computer program, a protector configuration method based on the electromagnetic transient characteristics of a cable as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements a protector configuration method based on the electromagnetic transient characteristics of a cable as described in any one of claims 1-7.

Images