Three-core cable metal layer thinning analysis method and related device

Abstract

The invention discloses a three-core cable metal layer thinning analysis method and a related device, and the method comprises the steps: building a short-circuit current distribution model of a three-core cable metal layer parallel path by considering the characteristic that three-phase metal layers share short-circuit current together when a three-core cable is in a single-phase short-circuit fault; single-phase short-circuit fault simulation under different crossing resistance values is carried out based on a short-circuit current distribution model of a three-core cable metal layer parallel path, the short-circuit current distribution condition of a three-core cable under a single-phase short-circuit fault is accurately calculated, and the metal layer thickness design of the three-core cable is optimized according to a short-circuit fault simulation result. The method ensures the reliability and economy of the cable under the condition of short circuit, is favorable for guiding the design optimization of the cable, has an important engineering application value, and solves the problem that the prior art is lack of the method on the basis of ensuring the safety and reliability of the cable under the condition of extreme short circuit. And the technical problem of optimizing the manufacturing cost of the cable and effectively reducing the thickness of the metal layer is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a method for analyzing metal layer thinning of a three-core cable and a related device. Background Art

[0002] Power cables, as the primary medium for transmitting electrical energy in power systems, play a vital role. As power system transmission capacity continues to increase, the magnitude of currents generated during short-circuit faults also increases. Therefore, effectively designing the cable structure and components, particularly their performance under high current conditions, has become a key issue in power cable design.

[0003] During cable design, the thickness of the metal layer is primarily considered to account for the potentially extreme currents that can occur during a short circuit. If the metal layer is too thin, the current can cause severe heating within the metal layer, compromising the insulation and mechanical properties of other cable components. Therefore, the thickness of the metal layer must be closely correlated with the current flowing through it during a short circuit to ensure safe cable operation during a short circuit.

[0004] In the design of a single-core cable, the metal layer of a single core needs to withstand the entire short-circuit current. However, for a three-core cable, since the metal layers of the three cores are in contact with each other and share the short-circuit current, in the event of a single-phase short-circuit fault, the short-circuit current will be shared by the three-phase metal layers, thereby greatly reducing the current borne by each metal layer. This feature makes it possible to optimize and reduce the thickness of the metal layer of a three-core cable compared to a single-core cable during design. In the prior art, no effective method for reducing the thickness of the metal layer is provided for the design of the metal layer of a three-core cable, so as to optimize the manufacturing cost of the cable while ensuring the safety and reliability of the cable under extreme short-circuit conditions. Summary of the Invention

[0005] The present invention provides a three-core cable metal layer thinning analysis method and related devices, which are used to solve the technical problem that the existing technology lacks an effective method for thinning the metal layer thickness that can optimize the cable manufacturing cost while ensuring the safety and reliability of the cable under extreme short-circuit conditions.

[0006] In view of this, a first aspect of the present invention provides a three-core cable metal layer thinning analysis method, comprising:

[0007] Constructing a short-circuit current distribution model for a parallel path of a three-core cable metal layer, the short-circuit current distribution model includes three parallel branches formed by the metal layers of the three-phase cables, the first and second ends of the three parallel branches are respectively connected to a common ground, and a spanning resistor is connected between adjacent branches of the three parallel branches;

[0008] Based on the short-circuit current distribution model, single-phase short-circuit fault simulation is performed under different span resistance values in preset simulation software to obtain short-circuit fault simulation results under different span resistances, wherein the short-circuit fault simulation results include actual short-circuit current values flowing through the three parallel branches;

[0009] The thickness thinning analysis result of the metal layer of the three-core cable is obtained according to the short-circuit fault simulation result.

[0010] Optionally, in the short-circuit current distribution model, each branch is connected in series with four lead alloy sheathed single-phase radial resistors, and the spanning resistor is connected to the front end of each lead alloy sheathed single-phase radial resistor between two adjacent branches.

[0011] Optionally, the single-phase radial resistance of the lead alloy sheath is a theoretically calculated value, and the spanning resistance is an actual measured value of the semi-conductive polyethylene sheath.

[0012] Optionally, based on the short-circuit current distribution model, performing single-phase short-circuit fault simulation under different span resistance values in preset simulation software to obtain short-circuit fault simulation results under different span resistances includes:

[0013] Based on the short-circuit current distribution model, single-phase short-circuit fault simulation is performed under different span resistance values in preset simulation software to obtain a first short-circuit fault simulation result;

[0014] Repeatedly adjusting the position of the short-circuit current source in the short-circuit current distribution model, performing single-phase short-circuit fault simulations under different spanning resistance values in preset simulation software, and obtaining a second short-circuit fault simulation result corresponding to each adjustment of the position of the short-circuit current source in the short-circuit current distribution model;

[0015] The first short-circuit fault simulation result and the second short-circuit fault simulation result are fitted into a curve of the short-circuit current on the lead alloy sheath of each phase of the three-core cable versus the distance from the fault point to obtain short-circuit fault simulation results under different spanning resistances.

[0016] Optionally, the preset simulation software is MATLAB.

[0017] Optionally, the short-circuit fault simulation result further includes thermal performance impact and mechanical performance impact on the three-core cable insulation material.

[0018] A second aspect of the present invention provides a three-core cable metal layer thinning analysis device, comprising:

[0019] A circuit modeling unit is used to construct a short-circuit current distribution model of a parallel path of a three-core cable metal layer, wherein the short-circuit current distribution model includes three parallel branches formed by the metal layers of the three-phase cables, the ends of the three parallel branches are respectively connected to a common ground, and a spanning resistor is connected between adjacent branches of the three parallel branches;

[0020] A simulation unit is configured to perform single-phase short-circuit fault simulation under different span resistance values in preset simulation software based on the short-circuit current distribution model, and obtain short-circuit fault simulation results under different span resistance values, wherein the short-circuit fault simulation results include actual short-circuit current values flowing through the three parallel branches;

[0021] A result output unit is used to obtain a thickness thinning analysis result of the metal layer of the three-core cable according to the short-circuit fault simulation result.

[0022] Optionally, in the short-circuit current distribution model, each branch is connected in series with four lead alloy sheathed single-phase radial resistors, and the spanning resistor is connected to the front end of each lead alloy sheathed single-phase radial resistor between two adjacent branches.

[0023] A third aspect of the present invention provides a three-core cable metal layer thinning analysis device, the device comprising a processor and a memory:

[0024] The memory is used to store program code and transmit the program code to the processor;

[0025] The processor is used to execute any one of the three-core cable metal layer thinning analysis methods described in the first aspect according to the instructions in the program code.

[0026] A fourth aspect of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium is used to store program code, and the program code is used to execute the three-core cable metal layer thinning analysis method described in any one of the first aspects.

[0027] From the above technical solutions, it can be seen that the three-core cable metal layer thinning analysis method provided by the present invention has the following advantages:

[0028] The metal layer thinning analysis method provided by the present invention takes into account the characteristic that the three-phase metal layers of the three-core cable share the short-circuit current when a single-phase short-circuit fault occurs in the three-core cable, establishes a short-circuit current distribution model of the parallel paths of the metal layers of the three-core cable, and performs single-phase short-circuit fault simulation under different spanning resistance values based on the short-circuit current distribution model of the parallel paths of the metal layers of the three-core cable. The short-circuit current distribution of the three-core cable under a single-phase short-circuit fault is accurately calculated, and the metal layer thickness design of the three-core cable is optimized according to the short-circuit fault simulation results to ensure the reliability and economy of the cable under short-circuit conditions. This is conducive to guiding the optimization of cable design, has important engineering application value, and solves the technical problem that the existing technology lacks an effective method for thinning the metal layer thickness that can optimize the cable manufacturing cost on the basis of ensuring the safety and reliability of the cable under extreme short-circuit conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A schematic flow chart of a method for analyzing metal layer thinning of a three-core cable provided in an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the cross-sectional structure of an HVAC cable provided in an embodiment of the present invention;

[0032] Figure 3 A short-circuit current distribution model for parallel paths of HVAC cable metal layers provided in an embodiment of the present invention;

[0033] Figure 4 A schematic diagram of a cross-resistance provided in an embodiment of the present invention;

[0034] Figure 5 A curve diagram showing the change of the short-circuit current of the fault phase with the distance under different spanning resistances provided in an embodiment of the present invention;

[0035] Figure 6 A graph showing changes in normal phase short-circuit current versus distance under different spanning resistances provided in an embodiment of the present invention;

[0036] Figure 7 This is a schematic structural diagram of a three-core cable metal layer thinning analysis device provided in an embodiment of the present invention;

[0037] Figure 8This is a schematic structural diagram of a three-core cable metal layer thinning analysis device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0039] For easier understanding, see Figure 1 and Figure 2 The present invention provides an embodiment of a three-core cable metal layer thinning analysis method, comprising:

[0040] Step 101: Construct a short-circuit current distribution model for the parallel paths of the three-core cable metal layers. The short-circuit current distribution model includes three parallel branches formed by the metal layers of the three-phase cables. The ends of the three parallel branches are respectively connected to a common ground, and a spanning resistor is connected between adjacent branches of the three parallel branches.

[0041] It should be noted that, in the present invention, Figure 2 The HVAC (High Voltage Alternating Current) three-core submarine cable shown is used for illustration, but is not limited to Figure 2 The HVAC three-core submarine cable shown, Figure 2 The reference numerals in the figure are: conductor 1, inner semi-conductive shielding layer 2, insulating layer 3, outer semi-conductive shielding layer 4, water-blocking layer 5, lead alloy sheath 6, polyethylene core sheath 7, shaped polyethylene filler 8, optical fiber unit 9, adhesive 10, polypropylene yarn armor 11, stainless steel armor 12, polypropylene yarn armor 13. Figure 3 The short-circuit current distribution model of the parallel path of the three-core cable metal layer is shown. In the short-circuit current distribution model, the three parallel branches are the three cable metal layers. The grounding of the left and right lower corners indicates the grounding of the cable metal layer. The middle branch is the fault phase. The short-circuit current at the fault point flows along the left and right of the cable. The current source represents the short-circuit current source. The resistor R1 represents the single-phase radial resistance of the lead alloy sheath (i.e. Figure 2 The equivalent resistance of the lead alloy sheath 6 in the lead alloy sheath), the spanning resistance R2 represents the spanning resistance of the semi-conductive polyethylene sheath between the two phases (i.e. Figure 2 The equivalent resistance of the polyethylene core sheath 7).

[0042] Step 102: Based on the short-circuit current distribution model, single-phase short-circuit fault simulation is performed under different span resistance values in preset simulation software to obtain short-circuit fault simulation results under different span resistances. The short-circuit fault simulation results include actual short-circuit current values flowing through the three parallel branches.

[0043] It should be noted that single-phase short-circuit fault simulations were performed using the pre-installed simulation software MATLAB under different span resistance values. Resistance R1 can be calculated based on the parameters in the attached table, taking the theoretical calculated value. Span resistance R2 is affected by multiple factors. Firstly, it is affected by the resistivity of the semiconductive PE material itself. Secondly, the contact area of the cable's semiconductive PE layer must be considered, as well as the interfacial resistance between the phases. Therefore, span resistance R2 takes the actual measured value of the semiconductive polyethylene sheath 7.

[0044] The current distribution is mainly determined by the resistance R1 and the crossover resistance R2. The resistance R1 is determined by the parameters, while the crossover resistance R2 is based on actual measurements. Therefore, in the calculation process, different crossover resistance R2 values (respectively taking r1 (large value), r2 (medium value), r3 (small value), i.e. r1>r2>r3) are used for analysis and calculation to obtain the short-circuit current curve of each phase lead alloy sheath of the three-core cable as a function of the distance from the fault point. The results are shown in the figure below. Figure 5 and Figure 6 Specifically, based on the short-circuit current distribution model, a single-phase short-circuit fault simulation is performed under different span resistance values in the preset simulation software to obtain a first short-circuit fault simulation result. Then, the position of the short-circuit current source in the short-circuit current distribution model (i.e., the position of the single-phase short-circuit fault point) is continuously adjusted. Single-phase short-circuit fault simulation is performed under different span resistance values in the preset simulation software to obtain a second short-circuit fault simulation result corresponding to each adjustment of the position of the short-circuit current source in the short-circuit current distribution model. The first and second short-circuit fault simulation results are fitted into a curve of the short-circuit current on the lead alloy sheath of each phase of the three-core cable as a function of the distance from the fault point to obtain the short-circuit fault simulation results under different span resistances.

[0045] In one embodiment, taking into account the thermoplastic characteristics of polypropylene materials and factors such as short-circuit faults that may occur during the actual operation of power cables, the present invention uses cable slices as the research object, and uses the multi-physics field simulation software COMSOL to simulate and calculate the accurate working conditions of the insulation materials at different positions of the cable under a single-phase short-circuit fault. A thermal shock test system is used to accurately simulate the effects of high temperature and thermal stress on the insulation materials under actual working conditions. Finally, a dielectric performance test and evaluation module is used to evaluate the insulation state of the insulation material after thermal shock to obtain the final short-circuit fault simulation results.

[0046] Step 103: Obtain a thickness thinning analysis result of the metal layer of the three-core cable according to the short-circuit fault simulation result.

[0047] Based on Figure 5 and Figure 6 The simulation results shown in the figure show that due to the parallel impedance between the phases, the short-circuit current on the lead alloy sheaths of the two normal phases gradually increases as the distance gradually increases. When the distance approaches infinity, the impedance between the lead alloy sheaths of the three cables approaches 0, the impedance of the lead alloy sheaths of the three cables themselves is equal, and the short-circuit current values on the lead alloy sheaths of the three cables tend to be equal, with each cable sharing 1 / 3 of the short-circuit current. When R2 is smaller, the resistance between the three lines is smaller, and the short-circuit current is more likely to flow from the lead alloy layer of the fault phase to the lead alloy layers of the other two phases. A shorter distance from the fault point can achieve a balanced state, that is, each phase shares 1 / 3 of the short-circuit current. According to the Joule heat calculation formula: , where P is power, I is current, and R is resistance. It can be seen that if the short-circuit current can be reduced by 1 / 3, the resistance of the metal layer can be increased by 9 times if the same calorific value is used as the design standard for the metal layer thickness. The formula for metal resistivity is: , where R is resistance, L is length, and A is cross-sectional area. is the resistivity. Under the condition that the resistivity remains unchanged, according to the above analysis, the cross-sectional area of the conductor can be reduced to 1 / 9 of the original. This also verifies the possibility of thinning the thickness of the metal layer of the three-core cable. Therefore, by analyzing the short-circuit current sharing characteristics of the three-core cable under a single-phase short-circuit fault, the metal layer design of the cable can be significantly optimized. When the short-circuit current is reduced by about 1 / 3, according to the Joule heat calculation formula, it can be deduced that the resistance of the metal layer is allowed to increase to 9 times the original, thereby effectively reducing the requirements for the cross-sectional area of the material. Further combined with the metal resistivity formula, under the premise that the resistivity remains unchanged, the cross-sectional area of the metal layer can be reduced to 1 / 9 of the original accordingly. Therefore, based on the short-circuit current distribution of the metal layer of the three-core cable under a single-phase short-circuit fault, the thickness of the metal layer of the three-core cable can be optimized to effectively save the raw material demand in the cable manufacturing process and reduce the cable manufacturing cost.

[0048] The metal layer thinning analysis method provided by the present invention takes into account the characteristic that the three-phase metal layers of the three-core cable share the short-circuit current when a single-phase short-circuit fault occurs in the three-core cable, establishes a short-circuit current distribution model of the parallel paths of the metal layers of the three-core cable, and performs single-phase short-circuit fault simulation under different spanning resistance values based on the short-circuit current distribution model of the parallel paths of the metal layers of the three-core cable. The short-circuit current distribution of the three-core cable under a single-phase short-circuit fault is accurately calculated, and the metal layer thickness design of the three-core cable is optimized according to the short-circuit fault simulation results to ensure the reliability and economy of the cable under short-circuit conditions. This is conducive to guiding the optimization of cable design, has important engineering application value, and solves the technical problem that the existing technology lacks an effective method for thinning the metal layer thickness that can optimize the cable manufacturing cost on the basis of ensuring the safety and reliability of the cable under extreme short-circuit conditions.

[0049] For easier understanding, see Figure 7 The present invention provides an embodiment of a three-core cable metal layer thinning analysis device, comprising:

[0050] A circuit modeling unit is used to construct a short-circuit current distribution model for the parallel paths of the metal layers of the three-core cable. The short-circuit current distribution model includes three parallel branches formed by the metal layers of the three-phase cables. The ends of the three parallel branches are respectively connected to a common ground. A spanning resistor is connected between adjacent branches of the three parallel branches.

[0051] A simulation unit is used to perform single-phase short-circuit fault simulation under different span resistance values in preset simulation software based on a short-circuit current distribution model, and obtain short-circuit fault simulation results under different span resistances. The short-circuit fault simulation results include actual short-circuit current values flowing through the three parallel branches;

[0052] The result output unit is used to obtain the thickness thinning analysis result of the metal layer of the three-core cable according to the short-circuit fault simulation result.

[0053] In one embodiment, in the short-circuit current distribution model, each branch is connected in series with four lead alloy sheathed single-phase radial resistors, and the spanning resistor is connected to the front end of each lead alloy sheathed single-phase radial resistor between two adjacent branches.

[0054] In one embodiment, the single-phase radial resistance of the lead alloy sheath is a theoretically calculated value, and the span resistance is an actual measured value of the semiconductive polyethylene sheath.

[0055] In one embodiment, the simulation unit is specifically configured to:

[0056] Based on the short-circuit current distribution model, single-phase short-circuit fault simulation is performed under different span resistance values in the preset simulation software to obtain the first short-circuit fault simulation result;

[0057] Repeatedly adjusting the position of the short-circuit current source in the short-circuit current distribution model, performing single-phase short-circuit fault simulations under different spanning resistance values in preset simulation software, and obtaining a second short-circuit fault simulation result corresponding to each adjustment of the position of the short-circuit current source in the short-circuit current distribution model;

[0058] The first short-circuit fault simulation results and the second short-circuit fault simulation results are fitted into the short-circuit current variation curve of the lead alloy sheath of each phase of the three-core cable with the distance from the fault point, and the short-circuit fault simulation results under different spanning resistances are obtained.

[0059] In one embodiment, the preset simulation software is MATLAB.

[0060] In one embodiment, the short circuit fault simulation result also includes the thermal performance impact and mechanical performance impact on the three-core cable insulation material.

[0061] An embodiment of the present invention further provides a three-core cable metal layer thinning analysis device, the device comprising a processor and a memory:

[0062] The memory is used to store program code and transmit the program code to the processor;

[0063] The processor is configured to execute any one of the methods for analyzing metal layer thinning of a three-core cable described in the aforementioned embodiments according to the instructions in the program code.

[0064] An embodiment of the present invention further provides a computer-readable storage medium for storing program code, wherein the program code is used to execute any one of the implementations of the three-core cable metal layer thinning analysis method described in the aforementioned embodiments.

[0065] The three-core cable metal layer thinning analysis device, equipment and computer-readable storage medium provided in the embodiments of the present invention are all used to execute the three-core cable metal layer thinning analysis method provided in the present invention. The principles and technical effects achieved are the same as those of the three-core cable metal layer thinning analysis method provided in the present invention, and will not be repeated here.

[0066] The terms "first," "second," and the like in the present invention are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present invention described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions, e.g., a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to these processes, methods, products, or apparatus.

[0067] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0068] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A three-core cable metal layer thinning analysis method, characterized in that: include: Constructing a short-circuit current distribution model for a parallel path of a three-core cable metal layer, the short-circuit current distribution model includes three parallel branches formed by the metal layers of the three-phase cables, the first and second ends of the three parallel branches are respectively connected to a common ground, and a spanning resistor is connected between adjacent branches of the three parallel branches; Based on the short-circuit current distribution model, single-phase short-circuit fault simulation is performed under different span resistance values in preset simulation software to obtain short-circuit fault simulation results under different span resistances, wherein the short-circuit fault simulation results include actual short-circuit current values flowing through the three parallel branches; The thickness thinning analysis result of the metal layer of the three-core cable is obtained according to the short-circuit fault simulation result.

2. The three-core cable metal layer thinning analysis method according to claim 1, characterized in that: In the short-circuit current distribution model, each branch is connected in series with four lead alloy sheathed single-phase radial resistors, and the spanning resistor is connected to the front end of each lead alloy sheathed single-phase radial resistor between two adjacent branches.

3. The three-core cable metal layer thinning analysis method according to claim 2, characterized in that: The single-phase radial resistance of the lead alloy sheath is a theoretically calculated value, and the spanning resistance is an actual measured value of the semi-conductive polyethylene sheath.

4. The three-core cable metal layer thinning analysis method according to claim 3, characterized in that: The single-phase short-circuit fault simulation under different span resistance values is performed based on the short-circuit current distribution model in preset simulation software to obtain short-circuit fault simulation results under different span resistance values, including: Based on the short-circuit current distribution model, single-phase short-circuit fault simulation is performed under different span resistance values in preset simulation software to obtain a first short-circuit fault simulation result; Repeatedly adjusting the position of the short-circuit current source in the short-circuit current distribution model, performing single-phase short-circuit fault simulations under different spanning resistance values in preset simulation software, and obtaining a second short-circuit fault simulation result corresponding to each adjustment of the position of the short-circuit current source in the short-circuit current distribution model; The first short-circuit fault simulation result and the second short-circuit fault simulation result are fitted into a curve of the short-circuit current on the lead alloy sheath of each phase of the three-core cable versus the distance from the fault point to obtain short-circuit fault simulation results under different spanning resistances.

5. The three-core cable metal layer thinning analysis method according to claim 1, characterized in that: The preset simulation software is MATLAB.

6. The three-core cable metal layer thinning analysis method according to claim 1, characterized in that: The short-circuit fault simulation results also include the thermal performance impact and mechanical performance impact on the three-core cable insulation material.

7. A three-core cable metal layer thinning analysis device, characterized in that: include: A circuit modeling unit is used to construct a short-circuit current distribution model of a parallel path of a three-core cable metal layer, wherein the short-circuit current distribution model includes three parallel branches formed by the metal layers of the three-phase cables, the ends of the three parallel branches are respectively connected to a common ground, and a spanning resistor is connected between adjacent branches of the three parallel branches; A simulation unit is configured to perform single-phase short-circuit fault simulation under different span resistance values in preset simulation software based on the short-circuit current distribution model, and obtain short-circuit fault simulation results under different span resistance values, wherein the short-circuit fault simulation results include actual short-circuit current values flowing through the three parallel branches; A result output unit is used to obtain a thickness thinning analysis result of the metal layer of the three-core cable according to the short-circuit fault simulation result.

8. The three-core cable metal layer thinning analysis device according to claim 7, characterized in that: In the short-circuit current distribution model, each branch is connected in series with four lead alloy sheathed single-phase radial resistors, and the spanning resistor is connected to the front end of each lead alloy sheathed single-phase radial resistor between two adjacent branches.

9. A three-core cable metal layer thinning analysis device, characterized in that: The device includes a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the three-core cable metal layer thinning analysis method according to any one of claims 1-6 according to the instructions in the program code.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium is used to store program code, and the program code is used to execute the three-core cable metal layer thinning analysis method according to any one of claims 1 to 6.

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