Eddy current loss calculation method and system for cable support

Abstract

The present invention discloses a method for calculating the eddy current loss of a cable support, comprising obtaining operation data information of a transmission line; performing finite element analysis based on electromagnetic coupling; establishing a physical model of the cable support; performing finite element calculation of the eddy current loss of the cable support based on electromagnetic coupling according to the analysis results and the physical model; performing numerical fitting on the calculation results to obtain the final functional relationship between the eddy current loss of the cable support and the cable current, and completing the eddy current loss calculation of the cable support. The present invention also discloses a system for implementing the eddy current loss calculation method of the cable support. The present invention calculates the eddy current loss of a steel support under different current sizes by a finite element simulation calculation method of electric field-magnetic field multi-physical field coupling, and then completes the calculation of the eddy current loss of the steel support by fitting the numerical fitting algorithm data; therefore, the present invention can not only calculate the eddy current loss of the cable support, but also has high reliability, good accuracy, and is convenient and fast.

Description

Technical Field

[0001] The invention belongs to the field of electrical automation, and in particular relates to a method and system for calculating eddy current loss of a cable support. Background Art

[0002] With the development of economy and technology and the improvement of people's living standards, electricity has become an indispensable secondary energy source in people's production and life, bringing endless convenience to people's production and life. Therefore, ensuring the stable and reliable operation of electricity has become one of the most important tasks of the power system.

[0003] At present, with the rapid development of the power system, the power cable transmission system has also developed rapidly. Cable lines can not only alleviate the shortage of urban land, but also beautify the environment, which meets the requirements of building a green and environmentally friendly power system. At present, cable lines have been widely used in distribution networks and are also becoming popular in transmission networks. Cable tunnels are the main channels for laying cables, and cable racks are used to support the laying of cables. At present, steel racks are the most widely used cable racks, while stainless steel and new composite material cable racks with low magnetic permeability are also widely used.

[0004] High-voltage cables are generally placed on metal brackets. The larger sinusoidal alternating current in the cable will generate an alternating magnetic field around the cable. The alternating magnetic field penetrates into the metal bracket and generates an induced electromotive force in the metal bracket. The metal bracket is composed of a conductive medium. Under the action of the induced electromotive force, the metal bracket will cause an induced current, that is, eddy current. The eddy current generates a magnetic field in the conductive medium. According to Lenz's law, the induced electromotive force and the current generated by it always hinder the change of the magnetic flux intersecting with the loop to weaken the original magnetic field. If the conductive medium is a ferromagnetic material, the alternating magnetic field will also cause hysteresis loss. Affected by the skin effect, the eddy current is mainly distributed on the surface of the conductor. Due to the resistivity of the metal bracket, the eddy current will be consumed in the form of eddy current loss. The operating current of the cable line is generally several hundred amperes, while the operating current of the transmission cable line is thousands of amperes. Therefore, under the action of large currents, the eddy current loss of the metal bracket cannot be ignored. In addition, the eddy current loss of the cable bracket is dissipated in the form of heat energy. If the eddy current loss of the bracket is too large, the cable bracket will produce a higher temperature rise. The long-term heating of the bracket will not only accelerate the aging of the cable insulation, but also be detrimental to the heat dissipation of the cable, which will reduce the current carrying capacity of the cable line.

[0005] With the extensive application of high-voltage, large-section single-core cables, the eddy current loss on the steel cable bracket has gradually attracted the attention of designers, construction and operation and maintenance personnel. Taking a cable of Beijing Power Supply Company as an example, during the inspection, it was found that the temperature of the steel bracket of a 1mm×2500mm220kV cross-linked polyethylene cable in the tunnel was abnormal. The measured temperature reached 60℃, the cable surface temperature was 45℃, and the bracket was 22℃ higher than the tunnel air temperature. The loss on the steel bracket is closely related to the cable current and the distance between the cable and the bracket. When the cable operating current reaches more than 800A, the eddy current loss on a pair of steel cable brackets can reach 4-8W, that is, a pair of brackets is equivalent to the power of a lamp. Although the loss of a single bracket is not large, the cable line is as short as tens of kilometers and as long as thousands of kilometers. In engineering, a pair of cable brackets are generally installed every 4-5m. The number of cable brackets is very large, and the total loss of the brackets is considerable.

[0006] Therefore, the calculation of eddy current loss of cable supports can not only help power system personnel to select and develop cable supports, but also help power system personnel to conduct corresponding research. However, the current method of calculating eddy current loss of cable supports generally uses empirical formulas for estimation; although this method is fast, the calculation results are less reliable and are no longer suitable for today's application requirements. Summary of the invention

[0007] One of the purposes of the present invention is to provide a method for calculating the eddy current loss of a cable support which is highly reliable, accurate, convenient and quick.

[0008] A second object of the present invention is to provide a system for implementing the eddy current loss calculation method of the cable support.

[0009] The eddy current loss calculation method of the cable support provided by the present invention comprises the following steps:

[0010] S1. Obtaining the operation data information of the transmission line;

[0011] S2. Performing finite element analysis based on electromagnetic coupling according to the operating data information obtained in step S1;

[0012] S3. Establish a physical model of the cable support according to the operation data information obtained in step S1;

[0013] S4. According to the analysis results obtained in step S2 and the physical model constructed in step S3, a finite element calculation of eddy current loss of the cable support based on electromagnetic coupling is performed;

[0014] S5. Perform numerical fitting on the calculation result obtained in step S4 to obtain the final functional relationship between the eddy current loss of the cable support and the cable current, thereby completing the eddy current loss calculation of the cable support.

[0015] The finite element analysis based on electromagnetic coupling described in step S2 specifically includes the following steps:

[0016] The generation principle of eddy current loss:

[0017] The alternating current flowing through the cable core will form an alternating magnetic field around the cable. The expression of magnetic induction intensity B is: Where μ is the magnetic permeability, H is the magnetic field intensity, I is the cable core current, and r is the distance from the infinitely long straight wire;

[0018] The alternating magnetic field penetrates into the cable support to form a closed magnetic circuit. The induced electromotive force e is

[0019] Under the action of induced electromotive force, an induced current will be generated in the cable support; due to the existence of resistivity, the induced current in the cable support will produce losses; this loss is eddy current loss;

[0020] Eddy current loss calculation principle:

[0021] Assumptions: The cable current is sinusoidal and balanced, the electromagnetic parameters of all objects are linear, and the electromagnetic characteristics of all objects are not affected by the ambient temperature;

[0022] According to Maxwell's equations, the vector magnetic potential A is introduced, and the equation is obtained

[0023]

[0024] For the non-current region without external excitation source, the control equation of the magnetic vector potential is:

[0025]

[0026] Where ▽ is the Hamiltonian operator, J s is the applied current density, ω is the angular frequency of the magnetic field change, and σ is the material conductivity;

[0027] Governing equations and coupling mechanisms of multi-physics fields:

[0028] The governing equation for electromagnetic coupling is:

[0029] ▽·J=0

[0030] ▽ × H = J

[0031] B=▽×A

[0032]

[0033] J=σE+jωD+σV×B+J e

[0034] Where J is the current density; H is the magnetic field intensity; B is the magnetic induction intensity; E is the electric field intensity; D is the electric displacement vector; J e is the source current density; V is the electric potential.

[0035] The physical model of the cable support described in step S3 specifically includes the following steps:

[0036] Construct a simplified cable structure model: The simplified cable structure from inside to outside is conductor, insulation layer, aluminum sheath and outer sheath;

[0037] Determination of cable length: Perform preliminary simulation calculations to determine the length of the cable;

[0038] Establishment of numerical calculation domain: Based on the cable bracket model, simplified cable structure and cable length, a three-dimensional simulation model is established in the finite element software at a ratio of 1:1; the simulation model uses a rectangular air domain to surround the cable and cable bracket; the simulation model includes cable lines, cable brackets and air domains.

[0039] The finite element calculation of eddy current loss of the cable support based on electromagnetic coupling described in step S4 specifically includes the following steps:

[0040] Boundary conditions were set, three-phase sinusoidal alternating current was applied to the cable, and the eddy current loss density distribution of the cable bracket was calculated through triple finite element iterations.

[0041] The eddy current loss of a pair of cable holders is calculated by performing volume integration on the eddy current loss density of the cable holder. Single and double cable arrangements are set respectively, and the operating current of the cables is changed to obtain the eddy current loss of the cable holders in specific arrangements under different operating current states.

[0042] Step S5 involves performing numerical fitting on the calculation results obtained in step S4 to obtain a final functional relationship between the eddy current loss of the cable support and the cable current. Specifically, a numerical fitting algorithm is used to perform numerical fitting on the calculation results obtained in step S4 to finally obtain a functional relationship between the eddy current loss of the cable support and the cable current in both single cable arrangement and double cable arrangement cases.

[0043] The present invention also discloses a system for realizing the eddy current loss calculation method of the cable support, which specifically includes a data acquisition module, a finite element analysis module, a physical model construction module, a finite element calculation module and an eddy current loss calculation module; the data acquisition module, the finite element analysis module, the physical model construction module, the finite element calculation module and the eddy current loss calculation module are connected in series in sequence; the data acquisition module is used to acquire the operation data information of the transmission line, and upload the data to the finite element analysis module; the finite element analysis module is used to perform finite element analysis based on electromagnetic coupling according to the received data, and upload the data to the physical model construction module; the physical model construction module is used to establish a physical model of the cable support according to the received data, and upload the data to the finite element calculation module; the finite element calculation module is used to perform finite element calculation of the eddy current loss of the cable support based on electromagnetic coupling according to the received data, and upload the data to the eddy current loss calculation module; the eddy current loss calculation module is used to perform numerical fitting on the obtained calculation results according to the received data, obtain the final functional relationship between the eddy current loss of the cable support and the cable current, and complete the eddy current loss calculation of the cable support.

[0044] The eddy current loss calculation method and system of the cable bracket provided by the present invention calculates the eddy current loss of the steel bracket under different current sizes through a finite element simulation calculation method of electric field-magnetic field multi-physical field coupling, and then completes the calculation of the eddy current loss of the steel bracket by fitting the numerical fitting algorithm data; therefore, the present invention can not only calculate the eddy current loss of the cable bracket, but also has high reliability, good accuracy and is convenient and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 The figure is a schematic diagram of the method flow of the present invention.

[0046] Figure 2 The figure is a schematic diagram of the 220kV cable structure of the method of the present invention.

[0047] Figure 3 A simplified schematic diagram of a 220 kV cable structure according to the method of the present invention.

[0048] Figure 4 A schematic diagram of the structure dimensions of a cable support according to an embodiment of the method of the present invention.

[0049] Figure 5 Schematic diagram of a cable support model according to an embodiment of the method of the present invention.

[0050] Figure 6 Schematic diagram of a cable structure model according to an embodiment of the method of the present invention.

[0051] Figure 7 Schematic diagram of a preliminary cable support eddy current loss calculation model for an embodiment of the method of the present invention.

[0052] Figure 8 This is a schematic diagram of the variation of eddy current loss of the bracket with cable length in an embodiment of the method of the present invention.

[0053] Fig. 9 Schematic diagram of a simulation model for calculating eddy current losses of a cable support according to an embodiment of the method of the present invention.

[0054] Fig.10 Schematic diagram of eddy current loss density distribution of an embodiment of the method of the present invention.

[0055] Fig.11 Schematic diagram of the functional modules of the system of the present invention. DETAILED DESCRIPTION

[0056] like Figure 1 The method flow chart of the method of the present invention is shown as follows: The method for calculating the eddy current loss of the cable support provided by the present invention comprises the following steps:

[0057] S1. Obtaining the operation data information of the transmission line;

[0058] S2. Perform finite element analysis based on electromagnetic coupling according to the operating data information obtained in step S1; specifically comprising the following steps:

[0059] The generation principle of eddy current loss:

[0060] The alternating current flowing through the cable core will form an alternating magnetic field around the cable. The expression of magnetic induction intensity B is: Where μ is the magnetic permeability, H is the magnetic field intensity, I is the cable core current, and r is the distance from the infinitely long straight wire;

[0061] The alternating magnetic field penetrates into the cable support to form a closed magnetic circuit. The induced electromotive force e is

[0062] Under the action of induced electromotive force, an induced current, namely eddy current, will be generated in the cable support; due to the existence of resistivity, the induced current in the cable support will produce loss; this loss is eddy current loss;

[0063] Eddy current loss calculation principle:

[0064] Assumptions: The cable current is sinusoidal and balanced, the electromagnetic parameters of all objects are linear, and the electromagnetic characteristics of all objects are not affected by the ambient temperature;

[0065] According to Maxwell's equations, the vector magnetic potential A is introduced, and the equation is obtained

[0066]

[0067] For the non-current region without external excitation source, the control equation of the magnetic vector potential is:

[0068]

[0069] Where ▽ is the Hamiltonian operator, J s is the applied current density, ω is the angular frequency of the magnetic field change, and σ is the material conductivity;

[0070] The problem of calculating eddy current loss of angle steel cable support can be essentially reduced to solving the above two equations;

[0071] Governing equations and coupling mechanisms of multi-physics fields:

[0072] The governing equation for electromagnetic coupling is:

[0073] ▽·J=0

[0074] ▽ × H = J

[0075] B=▽×A

[0076]

[0077] J=σE+jωD+σV×B+J e

[0078] Where J is the current density; H is the magnetic field intensity; B is the magnetic induction intensity; E is the electric field intensity; D is the electric displacement vector; J e is the source current density; V is the potential;

[0079] In specific implementation, the calculation of eddy current loss of cable support is analyzed from the physical process, which is the result of the mutual coupling of electric field and magnetic field. The alternating current flowing through the cable core generates an alternating magnetic field around the cable, and the alternating magnetic field generates an alternating current inside the steel support, namely eddy current. Due to the existence of the conductivity of the steel support, the eddy current will be consumed in the form of eddy current loss.

[0080] S3. Establishing a physical model of the cable support according to the operation data information obtained in step S1; specifically comprising the following steps:

[0081] Since the structure of the cable bracket is relatively complex and the modeling capability of the finite element software is limited, the present invention uses professional three-dimensional modeling software to model the cable bracket, and then imports it into the finite element software for simulation calculation;

[0082] Taking 220kV cable line as an example, the cable from inside to outside is conductor, inner semi-conductive tape, conductor shielding layer, XLPE insulation layer, insulation shielding layer, semi-conductive water-resistant tape, corrugated aluminum sheath, PVC outer sheath; the cable structure is as follows: Figure 2 As shown;

[0083] In order to simplify the model, it is assumed that the core of the power cable is a current-carrying conductor loaded with source current; the influence of space charge and displacement current is not considered; the magnetic permeability of the medium is considered to be linear; and the influence of harmonics is ignored. Since the materials between the conductor and the aluminum sheath are non-metallic, the conductivity and relative permeability are very small, which has little effect on the calculation of electromagnetic and magnetic fields; in order to reduce the amount of simulation calculation, the cable structure is simplified to a certain extent; when establishing the cable model, the space between the conductor and the aluminum sheath is regarded as an insulating layer; the simplified cable structure is as follows Figure 3 As shown in the figure, a simplified cable structure model is constructed: the simplified cable structure is conductor, insulation layer, aluminum sheath and outer sheath from inside to outside;

[0084] Determination of cable length: In a project, a pair of cable brackets are generally installed every 4 meters. The length of the cables on each bracket is about 4 meters, and the total length is about 8 meters. The length of the cable will affect the alternating magnetic field around the cable bracket. Therefore, the length of the cable will have a certain impact on the size of the bracket's eddy current loss. Perform preliminary simulation calculations to determine the length of the cable.

[0085] Establishment of numerical calculation domain: Based on the cable bracket model, simplified cable structure and cable length, a three-dimensional simulation model is established in the finite element software at a ratio of 1:1; the simulation model uses a rectangular air domain to surround the cable and cable bracket; the simulation model includes the cable line, cable bracket and air domain;

[0086] S4. According to the analysis results obtained in step S2 and the physical model constructed in step S3, a finite element calculation of eddy current loss of the cable support based on electromagnetic coupling is performed; specifically comprising the following steps:

[0087] Boundary conditions were set, three-phase sinusoidal alternating current was applied to the cable, and the eddy current loss density distribution of the cable bracket was calculated through triple finite element iterations.

[0088] The eddy current loss of a pair of cable brackets is calculated by volume integration of the eddy current loss density of the cable brackets. Single and double cable arrangements are set respectively, and the cable operating current is changed to obtain the eddy current loss of the cable brackets in specific arrangements under different operating current states.

[0089] S5. Perform numerical fitting on the calculation result obtained in step S4 to obtain the final functional relationship between the eddy current loss of the cable support and the cable current, and complete the eddy current loss calculation of the cable support; specifically, adopt a numerical fitting algorithm to perform numerical fitting on the calculation result obtained in step S4, and finally obtain the functional relationship between the eddy current loss of the cable support and the cable current in both single cable arrangement and double cable arrangement.

[0090] The method of the present invention is further described below in conjunction with an embodiment:

[0091] The research object of this embodiment is the cable support of 220kV transmission cable line, taking the typical YJLW02-127 / 220kV cable as an example;

[0092] Physical model establishment:

[0093] Cable support model establishment: The structural dimensions of a 220kV cable line steel support are as follows: Figure 4 As shown; Based on the actual size of the bracket, the bracket model is established in Solidworks as shown Figure 5 As shown;

[0094] Cable model establishment:

[0095] The cable parameters of YJLW02-127 / 220kV cable are shown in Table 1;

[0096] Table 1 Schematic table of power cable parameters

[0097] Cable Model YJLW02-127 / 220kV Conductor diameter / mm 60.0 Inner semi-conductive tape thickness / mm 0.4 Conductor shielding layer thickness / mm 1.8 XLPE insulation thickness / mm 24.0 Insulation shielding layer thickness / mm 1.0 Semi-conductive water hose thickness / mm 10.0 Corrugated aluminum sheath thickness / mm 2.8 Flame retardant PVC outer sheath thickness / mm 5.0 Cable outer diameter / mm 150.0

[0098] In order to reduce the amount of simulation calculation, the area between the conductor and the aluminum sheath is considered as an insulation layer. After simplification, the cable is composed of conductor, insulation layer, aluminum sheath and outer sheath from inside to outside. Based on the cable structure parameters, the cable structure model is established as follows: Figure 6 As shown;

[0099] Determination of cable length:

[0100] Based on the cable bracket and simplified cable structure model, a preliminary cable bracket eddy current loss calculation model is built. Figure 7 As shown;

[0101] A sinusoidal alternating current with an effective value of 1000A is passed through the cable, and the length of the cable is changed. The variation law of the eddy current loss of the bracket with the cable length is obtained as follows: Figure 8 As shown;

[0102] When the cable length is less than 4m, the cable length has a greater impact on the eddy current loss of the cable bracket, but when the cable length is greater than 4m, the cable length has a small impact on the eddy current loss of the bracket; therefore, in order to reduce the amount of simulation calculation, the cable length in the simulation calculation model is determined to be 4m;

[0103] Establishment of numerical calculation domain:

[0104] Import the cable bracket and cable model into COMSOL Multiphysics and build a 3D simulation model at a 1:1 ratio. Eddy current loss simulation calculation model Fig. 9 As shown; among them, Fig. 9 (a) is a single-circuit line model. Fig. 9 (b) is a double-circuit line model;

[0105] Finite element calculation of eddy current loss in cable support based on electromagnetic coupling:

[0106] Calculation of eddy current loss of cable support for single circuit line:

[0107] The cable is laid vertically, with phases A, B, and C from top to bottom. In the simulation, the current of each line is equal, and the phase difference is 120°. Take the typical operating current of 1000A as an example. Through the finite element triple iteration, the eddy current loss density distribution of the cable bracket is obtained as follows: Fig.10 shown.

[0108] By volume integration of the eddy current loss density, it is found that the loss of a single-circuit line support is 13.156W when the operating current is 1000A. By changing the operating current, the loss of a single-circuit line support under different current conditions is shown in Table 2:

[0109] Table 2 Schematic diagram of single-circuit line support losses under different current conditions

[0110] Cable current / A 800 1000 1200 1400 Eddy current loss / W 8.421 13.156 18.945 25.786

[0111] Calculation of eddy current loss of double-circuit line cable support:

[0112] In engineering projects, there is often more than one circuit on the cable support, and there may be double or even multiple circuits. Transmission cable supports generally lay one or two circuits. On the basis of a single circuit, another circuit is added, and other conditions are the same as those of a single circuit. After calculation, the losses of the double circuit support under different current conditions are shown in Table 3:

[0113] Table 3 Schematic diagram of double-circuit line support losses under different current conditions

[0114] Cable current / A 800 1000 1200 1400 Eddy current loss / W 15.982 24.825 35.886 48.844

[0115] Fitting eddy current loss calculation formula:

[0116] Fitting of the calculation formula for eddy current loss of a single-circuit line: Based on the single-circuit line support loss under different current conditions, the data is fitted through a numerical fitting algorithm, and the functional relationship between the single-circuit line support loss and the cable current is obtained as P s =1.31×10 -5 I 2.001 +0.005069;

[0117] Fitting of the calculation formula for double-circuit line eddy current loss: Based on the double-circuit line support loss under different current conditions, the numerical fitting algorithm is used to fit the data, and the functional relationship between the double-circuit line support loss and the cable current is obtained as P d =1.975×10 -5 I 2.031 +0.4179.

[0118] like Fig.11 The figure shows a schematic diagram of the functional modules of the system of the present invention: the system disclosed in the present invention for realizing the eddy current loss calculation method of the cable support specifically includes a data acquisition module, a finite element analysis module, a physical model construction module, a finite element calculation module and an eddy current loss calculation module; the data acquisition module, the finite element analysis module, the physical model construction module, the finite element calculation module and the eddy current loss calculation module are connected in series in sequence; the data acquisition module is used to acquire the operation data information of the transmission line, and upload the data to the finite element analysis module; the finite element analysis module is used to perform finite element analysis based on electromagnetic coupling according to the received data, and upload the data to the physical model construction module; the physical model construction module is used to establish a physical model of the cable support according to the received data, and upload the data to the finite element calculation module; the finite element calculation module is used to perform finite element calculation of the eddy current loss of the cable support based on electromagnetic coupling according to the received data, and upload the data to the eddy current loss calculation module; the eddy current loss calculation module is used to perform numerical fitting on the obtained calculation results according to the received data, obtain the final functional relationship between the eddy current loss of the cable support and the cable current, and complete the eddy current loss calculation of the cable support.

Claims

1. A method for calculating eddy current loss of a cable support, comprising the following steps: S1. Obtaining the operation data information of the transmission line; S2. Perform finite element analysis based on electromagnetic coupling according to the operating data information obtained in step S1; specifically comprising the following steps: The generation principle of eddy current loss: The alternating current flowing through the cable core will form an alternating magnetic field around the cable. The expression of magnetic induction intensity B is: Where μ is the magnetic permeability, H is the magnetic field intensity, I is the cable core current, and r is the distance from the infinitely long straight wire; The alternating magnetic field penetrates into the cable support to form a closed magnetic circuit. The induced electromotive force e is Under the action of induced electromotive force, an induced current will be generated in the cable support; due to the existence of resistivity, the induced current in the cable support will produce losses; this loss is eddy current loss; Eddy current loss calculation principle: Assumptions: The cable current is sinusoidal and balanced, the electromagnetic parameters of all objects are linear, and the electromagnetic characteristics of all objects are not affected by the ambient temperature; According to Maxwell's equations, the vector magnetic potential A is introduced, and the equation is obtained For the non-current region without external excitation source, the control equation of the magnetic vector potential is: In the formula is the Hamiltonian operator, J s is the applied current density, ω is the angular frequency of the magnetic field change, and σ is the material conductivity; Governing equations and coupling mechanisms of multi-physics fields: The governing equation for electromagnetic coupling is: J=σE+jωD+σV×B+J e Where J is the current density; H is the magnetic field intensity; B is the magnetic induction intensity; E is the electric field intensity; D is the electric displacement vector; J e is the source current density; V is the potential; S3. Establishing a physical model of the cable support according to the operation data information obtained in step S1; specifically comprising the following steps: Construct a simplified cable structure model: The simplified cable structure from inside to outside is conductor, insulation layer, aluminum sheath and outer sheath; Determination of cable length: Perform preliminary simulation calculations to determine the length of the cable; Establishment of numerical calculation domain: Based on the cable bracket model, simplified cable structure and cable length, a three-dimensional simulation model is established in the finite element software at a ratio of 1:1; the simulation model uses a rectangular air domain to surround the cable and cable bracket; the simulation model includes the cable line, cable bracket and air domain; S4. According to the analysis results obtained in step S2 and the physical model constructed in step S3, a finite element calculation of eddy current loss of the cable support based on electromagnetic coupling is performed; specifically comprising the following steps: Boundary conditions were set, three-phase sinusoidal alternating current was applied to the cable, and the eddy current loss density distribution of the cable bracket was calculated through triple finite element iterations. The eddy current loss of a pair of cable brackets is calculated by volume integration of the eddy current loss density of the cable brackets. Single and double cable arrangements are set respectively, and the cable operating current is changed to obtain the eddy current loss of the cable brackets in specific arrangements under different operating current states. S5. Perform numerical fitting on the calculation result obtained in step S4 to obtain the final functional relationship between the eddy current loss of the cable support and the cable current, and complete the eddy current loss calculation of the cable support; specifically, adopt a numerical fitting algorithm to perform numerical fitting on the calculation result obtained in step S4, and finally obtain the functional relationship between the eddy current loss of the cable support and the cable current in both single cable arrangement and double cable arrangement.

2. A system for implementing the eddy current loss calculation method of the cable support according to claim 1, characterized in that Specifically, it includes a data acquisition module, a finite element analysis module, a physical model construction module, a finite element calculation module and an eddy current loss calculation module; the data acquisition module, the finite element analysis module, the physical model construction module, the finite element calculation module and the eddy current loss calculation module are connected in series in sequence; the data acquisition module is used to obtain the operation data information of the transmission line and upload the data to the finite element analysis module; The finite element analysis module is used to perform finite element analysis based on electromagnetic coupling according to the received data, and upload the data to the physical model construction module; the physical model construction module is used to establish a physical model of the cable bracket according to the received data, and upload the data to the finite element calculation module; the finite element calculation module is used to perform finite element calculation of eddy current loss of the cable bracket based on electromagnetic coupling according to the received data, and upload the data to the eddy current loss calculation module; The eddy current loss calculation module is used to perform numerical fitting on the calculation results according to the received data, obtain the final functional relationship between the eddy current loss of the cable support and the cable current, and complete the eddy current loss calculation of the cable support.

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