Electromagnetic interference protection method and device for the secondary system of GIL in tunnel

Abstract

This application provides an electromagnetic interference (EMI) protection method and apparatus for the secondary system of a gas-insulated barrier (GIL) within a tunnel, relating to the field of electromagnetic compatibility (EMC) technology. The method includes: determining the spatial distribution characteristics of the electromagnetic field within the tunnel based on a pre-constructed electromagnetic field simulation model for the tunnel; then, selecting and implementing multiple preset protection measures based on these characteristics to provide multi-dimensional EMI protection for the secondary system of the GIL within the tunnel; and detecting the induced current in the secondary system after implementing each preset protection measure. Further, based on the induced current, a target protection measure is selected from the preset protection measures corresponding to each dimension, and a comprehensive EMI protection strategy is generated for the secondary system based on the target protection measure. This application can improve the systematicness, adaptability, and long-term stability of EMI protection for the secondary system.

Description

Technical Field

[0001] This application relates to the field of electromagnetic compatibility technology, and particularly to an electromagnetic anti-interference protection method and device for the secondary system of Gas-insulated metal-closed transmission line (GIL) in tunnels. Background Art

[0002] In tunnel engineering, the power-frequency magnetic field generated during the operation of Gas-insulated metal-closed transmission line (GIL) is likely to form a complex coupling effect through metal structures such as metal enclosures and steel bar networks, and thus leak out into the tunnel space. The secondary system installed in the tunnel space and配套 with GIL is extremely sensitive to electromagnetic interference. Therefore, in order to ensure the safe operation of the secondary system, it is necessary to provide electromagnetic anti-interference protection for the secondary system.

[0003] Currently, the existing electromagnetic anti-interference protection for secondary systems mostly adopts single protection measures, such as increasing the distance between the secondary system and GIL, or shielding the secondary system, or enhancing the shell circulation of GIL by using highly conductive materials to offset the leaked magnetic field of GIL.

[0004] However, the existing technology lacks systematic collaborative design, resulting in limited electromagnetic anti-interference protection for secondary systems. Summary of the Invention

[0005] This application provides an electromagnetic anti-interference protection method and device for the secondary system of GIL in tunnels, aiming to solve the technical problem of limited electromagnetic anti-interference protection for the secondary system of GIL in the existing technology.

[0006] In a first aspect, this application provides an electromagnetic anti-interference protection method for the secondary system of GIL in tunnels, including:

[0007] Based on the electromagnetic field simulation model pre-established for the tunnel, determine the spatial distribution characteristics of the electromagnetic field in the tunnel; wherein, the electromagnetic field simulation model is used to simulate the power-frequency magnetic field generated by the Gas-insulated metal-closed transmission line (GIL) in the tunnel;

[0008] Based on the spatial distribution characteristics of the electromagnetic field, select multiple preset protection measures; execute the multiple preset protection measures to provide multi-dimensional electromagnetic anti-interference protection for the secondary system of GIL in the tunnel; wherein, the electromagnetic anti-interference protection in each dimension corresponds to at least one preset protection measure;

[0009] After executing each preset protection measure, detect the induced current of the secondary system; based on the induced current, select the target protection measure from the preset protection measures corresponding to each dimension; based on the target protection measure, generate a comprehensive electromagnetic anti-interference protection strategy for the secondary system.

[0010] In one possible design, the implementation of the multiple preset protective measures includes:

[0011] Based on preset protection dimensions, the multiple preset protection measures are divided to obtain a first-dimensional protection measure set, a second-dimensional protection measure set, and a third-dimensional protection measure set; wherein, the preset protection dimensions include the first protection dimension, the second protection dimension, and the third protection dimension;

[0012] The preset protection measures included in the first dimension protection measure set, the preset protection measures included in the second dimension protection measure set, and the preset protection measures included in the third dimension protection measure set are executed respectively.

[0013] In one possible design, based on the induced current, a target protection measure is selected from preset protection measures corresponding to each dimension, including:

[0014] The induced current is compared with a preset safe induced current threshold, and the induced current that is less than or equal to the preset safe induced current threshold is determined as the target induced current.

[0015] Select the target protection measure corresponding to the target induced current from the first set of protection measures, the second set of protection measures, and the third set of protection measures.

[0016] In one possible design, the method further includes:

[0017] Analyze the preset parameters, protection functions, and preset protection dimensions of each target protection measure, and classify the target protection measures to obtain at least one protection measure class; among them, target protection measures that are under the same preset protection dimension, have the same protection function, but have different preset parameter values ​​are grouped into the same class;

[0018] The target protection measures and their corresponding target induced currents included in the protection measure class are sorted in ascending order to determine the target protection measure corresponding to the target induced current that is ranked first; other target protection measures in the protection measure class except for the target protection measure are deleted.

[0019] In one possible design, the preset protection dimensions include a first protection dimension of interference source protection, a second protection dimension of interference path protection, and a third protection dimension of interference receptor protection.

[0020] In one possible design, based on a pre-constructed electromagnetic field simulation model for the tunnel, the spatial distribution characteristics of the electromagnetic field within the tunnel are determined, including:

[0021] Obtain the associated structural parameters and historical operating parameters of the GIL within the tunnel; based on the associated structural parameters and historical operating parameters, construct an electromagnetic field simulation model for the tunnel;

[0022] Obtain the real-time operating parameters of the GIL; input the real-time operating parameters into the electromagnetic field simulation model, and determine the spatial distribution characteristics of the electromagnetic field in the tunnel output by the electromagnetic field simulation model.

[0023] In one possible design, the associated structural parameters include one or more of the following: the three-phase conductor structural parameters of the GIL, the metal casing structural parameters, and the grounding busbar structural parameters, the reinforcing steel network structural parameters, and the metal support structural parameters associated with the GIL.

[0024] Secondly, this application provides an electromagnetic interference protection device for the secondary system of a GIL (Gas Inductor Lighting) in a tunnel, comprising:

[0025] The determination module is used to determine the spatial distribution characteristics of the electromagnetic field within the tunnel based on a pre-constructed electromagnetic field simulation model for the tunnel; wherein, the electromagnetic field simulation model is used to simulate the power frequency magnetic field generated by the gas-insulated metal-enclosed transmission line (GIL) within the tunnel;

[0026] The selection module is used to select multiple preset protection measures based on the spatial distribution characteristics of the electromagnetic field;

[0027] The protection module is used to execute the multiple preset protection measures to provide multi-dimensional electromagnetic interference protection for the secondary system of GIL in the tunnel; wherein, the electromagnetic interference protection in each dimension corresponds to at least one preset protection measure.

[0028] The detection module is used to detect the induced current of the secondary system after each preset protection measure is implemented;

[0029] The selection module is also used to select a target protection measure from the preset protection measures corresponding to each dimension based on the induced current;

[0030] The generation module is used to generate a comprehensive electromagnetic interference protection strategy for the secondary system based on the target protection measures.

[0031] In one possible design, the protection module includes:

[0032] The partitioning submodule is used to partition the multiple preset protection measures based on preset protection dimensions to obtain a first-dimensional protection measure set, a second-dimensional protection measure set, and a third-dimensional protection measure set; wherein, the preset protection dimensions include the first protection dimension, the second protection dimension, and the third protection dimension;

[0033] The execution submodule is used to execute the preset protection measures included in the first dimension protection measure set, the preset protection measures included in the second dimension protection measure set, and the preset protection measures included in the third dimension protection measure set, respectively.

[0034] In one possible design, the selection module includes:

[0035] The comparison submodule is used to compare the induced current with a preset safe induced current threshold.

[0036] The determination submodule is used to determine the induced current that is less than or equal to the preset safety induced current threshold as the target induced current;

[0037] The selection submodule is used to select the target protection measure corresponding to the target induced current from the first dimension protection measure set, the second dimension protection measure set, and the third dimension protection measure set.

[0038] In one possible design, the selection module further includes:

[0039] The classification submodule is used to analyze the preset parameters, protection functions, and preset protection dimensions of each target protection measure, and to classify each target protection measure to obtain at least one protection measure class; wherein, target protection measures that are under the same preset protection dimension, have the same protection function, but have different preset parameter values ​​are classified into the same class.

[0040] The sorting submodule is used to sort the target protection measures and corresponding target induced currents included in the protection measure class in ascending order, and determine the target protection measure corresponding to the target induced current ranked first.

[0041] The delete submodule is used to delete other target protection measures in the protection measure class besides the target protection measure.

[0042] In one possible design, the preset protection dimensions include a first protection dimension of interference source protection, a second protection dimension of interference path protection, and a third protection dimension of interference receptor protection.

[0043] In one possible design, the determining module includes:

[0044] The acquisition submodule is used to acquire the associated structural parameters and historical operating parameters of the GIL within the tunnel;

[0045] A submodule is constructed to build an electromagnetic field simulation model for the tunnel based on the associated structural parameters and the historical operating parameters.

[0046] The acquisition submodule is also used to acquire the real-time operating parameters of the GIL;

[0047] The input submodule is used to input the real-time operating parameters into the electromagnetic field simulation model and determine the spatial distribution characteristics of the electromagnetic field in the tunnel output by the electromagnetic field simulation model.

[0048] In one possible design, the associated structural parameters include one or more of the following: the three-phase conductor structural parameters of the GIL, the metal casing structural parameters, and the grounding busbar structural parameters, the reinforcing steel network structural parameters, and the metal support structural parameters associated with the GIL.

[0049] Thirdly, this application provides an electronic device comprising: at least one processor and a memory; the memory storing computer-executable instructions; the at least one processor executing the computer-executable instructions stored in the memory, causing the at least one processor to perform the method described in the first aspect and / or various possible designs of the first aspect.

[0050] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the method described in the first aspect and / or various possible designs of the first aspect.

[0051] Fifthly, embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the method described in the first aspect and / or various possible designs of the first aspect.

[0052] The electromagnetic interference (EMI) protection method and apparatus for the secondary system of a gas-insulated barrier (GIL) in a tunnel provided in this application determine the spatial distribution characteristics of the electromagnetic field within the tunnel based on a pre-constructed electromagnetic field simulation model. The electromagnetic field simulation model simulates the power frequency magnetic field generated by the GIL within the tunnel. Then, based on the spatial distribution characteristics of the electromagnetic field, multiple preset protection measures are selected and executed to provide multi-dimensional EMI protection for the secondary system of the GIL within the tunnel. Each dimension of EMI protection corresponds to at least one preset protection measure. After executing each preset protection measure, the induced current of the secondary system is detected. Further, based on the induced current, a target protection measure is selected from the preset protection measures corresponding to each dimension. Based on the target protection measure, a comprehensive EMI protection strategy is generated for the secondary system. This application constructs a closed-loop optimization mechanism from electromagnetic simulation analysis, protection measure execution, measure effect verification, and comprehensive strategy generation, thereby forming a full-chain protection system for the GIL secondary system. Meanwhile, the generated comprehensive electromagnetic interference protection strategy can cover the three protection dimensions of interference source, interference path and interference receptor, and act on different protection links to form a comprehensive protection for the secondary system, thereby improving the systematicness, adaptability and long-term stability of the electromagnetic interference protection of the secondary system. Attached Figure Description

[0053] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0054] Figure 1 A schematic flowchart illustrating the electromagnetic interference protection method for the secondary system of GIL in a tunnel provided in this embodiment of the application;

[0055] Figure 2 A scenario illustration of the electromagnetic interference protection method for the secondary system of GIL in a tunnel provided in this application embodiment. Figure 1 ;

[0056] Figure 3 A scenario illustration of the electromagnetic interference protection method for the secondary system of GIL in a tunnel provided in this application embodiment. Figure 2 ;

[0057] Figure 4 A scenario illustration of the electromagnetic interference protection method for the secondary system of GIL in a tunnel provided in this application embodiment. Figure 3 ;

[0058] Figure 5 A scenario illustration of the electromagnetic interference protection method for the secondary system of GIL in a tunnel provided in this application embodiment. Figure 4 ;

[0059] Figure 6 A schematic diagram of the electromagnetic interference protection device for the secondary system of GIL in a tunnel provided in an embodiment of this application;

[0060] Figure 7 This is a hardware structure diagram of the electronic device provided in the embodiments of this application.

[0061] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0062] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application.

[0063] First, the terms used in this application will be explained.

[0064] Secondary system: refers to the overall system of measurement, protection, monitoring, control, and communication devices and their associated lines installed within the tunnel and serving GIL operation. Examples include relay protection units, measurement units, condition monitoring terminals, data acquisition interfaces, communication equipment, and the control cables, signal cables, and low-voltage transmission lines connected to them. The secondary system is the direct protection target of this application.

[0065] Electromagnetic interference protection for the secondary system of GIL (Gas Insulated Linear Irrigation) in tunnels is applicable to GIL-supporting secondary systems in enclosed or semi-enclosed spaces such as underground utility tunnels, river-crossing and sea-crossing tunnels, and long mountain tunnels. In these scenarios, GIL is typically laid continuously along the tunnel axis, and the supporting secondary system includes secondary equipment and secondary cables.

[0066] Secondary equipment includes relay protection units, measurement units, status monitoring terminals, sensor interfaces, and communication links; secondary cables include control cables, signal cables, and low-voltage transmission lines that serve the secondary equipment.

[0067] Due to the long and narrow space of tunnels, high equipment density, and concentrated distribution of metal components, the power frequency magnetic field generated during GIL operation will exhibit significant distribution differences within the confined space, affecting adjacent secondary systems through induction, coupling, and conduction. Especially when the GIL operates under high load for extended periods, or when multiple metal structures are interwoven within the tunnel, the electromagnetic environment in localized areas will deteriorate significantly, reducing the interference immunity margin of the secondary systems. Therefore, to ensure the safe operation of the secondary systems, it is necessary to implement electromagnetic interference protection.

[0068] Currently, existing electromagnetic interference protection measures for secondary systems mostly employ single protective measures. Commonly used protective measures in engineering include increasing the laying distance between the secondary system and the GIL, adding a metal shielding structure to the secondary system, or using highly conductive materials to enhance the circulating current in the GIL's casing to counteract the GIL's leaked magnetic field.

[0069] However, in complex tunnel environments, actual electromagnetic interference is not determined by a single factor, but is related to the conductivity continuity of the tunnel reinforcement network, the spatial distribution of metal supports and cable trays, the connection status of the grounding structure, and the operating conditions of the GIL.

[0070] Existing technologies often treat various protective measures as independent engineering methods, lacking a holistic analysis of complex coupled environments. This leads to the possibility that even if spacing or shielding measures are taken in certain sections of the secondary system, new coupling channels may still be formed due to local metal structures, resulting in concentrated interference.

[0071] It is evident that the lack of systematic and collaborative design in existing technologies results in limited electromagnetic interference protection for secondary systems.

[0072] Starting from the limitations of existing technologies, the inventors first analyzed the physical mechanism of magnetic field leakage during GIL operation, discovering that factors such as the conductivity of the metal casing, flange contact resistance, and grounding busbar layout directly affect the intensity of the leaked magnetic field. Subsequently, by constructing an electromagnetic field simulation model for tunnels, they quantitatively analyzed the impact of each factor on the magnetic field distribution. Based on this, they further proposed a multi-dimensional electromagnetic interference protection strategy, encompassing interference sources, interference paths, and interference receptors. Finally, through layered implementation and dynamic adjustment, they formed a comprehensive electromagnetic interference protection strategy suitable for GIL secondary systems in complex tunnel environments.

[0073] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0074] This application provides an electromagnetic interference protection method for the secondary system of GIL in a tunnel. Figure 1 A schematic flowchart illustrating the electromagnetic interference protection method for the secondary system of GIL in a tunnel provided in this application embodiment is shown below. Figure 1 As shown, the electromagnetic interference protection method for the secondary system of GIL in the tunnel includes:

[0075] S101. Based on the electromagnetic field simulation model pre-built for the tunnel, determine the spatial distribution characteristics of the electromagnetic field within the tunnel.

[0076] Explanatoryly, the electromagnetic field simulation model in this embodiment simulates the power frequency magnetic field generated by the GIL by incorporating the associated structural parameters and operating parameters of the GIL within the tunnel into a built-in analysis framework, and calculates the spatial distribution characteristics of the electromagnetic field of the power frequency magnetic field.

[0077] Among these, the power frequency magnetic field is the main source of interference generated by the GIL (Gas Infrared Tunnel) during operation at its rated frequency, especially in the enclosed or semi-enclosed spaces of ultra-long-distance tunnels. This power frequency magnetic field is affected by the GIL's own conductive structure and its associated conductive structures, resulting in a significant spatial redistribution. The spatial distribution characteristics of the electromagnetic field refer to the distribution state of the electromagnetic field at different locations in the longitudinal, lateral, and vertical directions of the tunnel, including a near-field high-interference region, a mid-field rapid attenuation region, and a far-field low-interference region. For example, the region within 200mm of the GIL is the near-field high-interference region, 200-500mm is the mid-field rapid attenuation region, and above 500mm is the far-field low-interference region.

[0078] In detail, this step relies on the associated structural parameters and historical operating parameters of the GIL to construct an electromagnetic field simulation model for the tunnel. Then, the real-time operating parameters of the GIL are input into the electromagnetic field simulation model, which automatically calculates the spatial distribution characteristics of the electromagnetic field within the tunnel.

[0079] In one possible implementation, the electromagnetic field simulation model can be established using calculation methods such as finite element calculation, field-circuit coupling calculation, or equivalent magnetic circuit, and the conductivity characteristics of the tunnel cross-section, lining structure, and metal auxiliary components can be included in the modeling scope so that the electromagnetic field simulation model can reflect the magnetic field superposition, attenuation, and local concentration effects within the closed tunnel.

[0080] It should be understood that the associated structural parameters are used to characterize the structural state of the GIL within the tunnel. Historical operating parameters are used to reflect the load changes and electromagnetic response characteristics of the GIL during past operations. Real-time operating parameters are used to characterize the operating state of the GIL at the current moment and serve as immediate input for updating the electromagnetic field simulation model.

[0081] It should be noted that after receiving real-time operating parameters, the electromagnetic field simulation model recalculates the magnetic induction intensity and magnetic field gradient at each spatial location within the tunnel based on these parameters, and then outputs the spatial distribution characteristics of the electromagnetic field corresponding to the tunnel's axial and lateral positions. These real-time operating parameters can be acquired by an online monitoring system, protection system, or dispatching system; this embodiment does not limit their acquisition.

[0082] In this embodiment, the associated structural parameters may include one or more of the following: the three-phase conductor structural parameters of the GIL, the metal casing structural parameters, and the grounding busbar structural parameters, steel reinforcement network structural parameters, and metal support structural parameters associated with the GIL. Historical operating parameters may include one or more of the following: historical current, historical voltage, load factor, and operating time, etc.

[0083] For the associated structural parameters of the GIL, the explanatory three-phase conductor structural parameters characterize the geometric dimensions, phase arrangement, and axial extension characteristics of the three-phase conductors of the GIL. The metal shell structural parameters characterize the cross-sectional shape, wall thickness, and continuous laying length of the metal shell covering the GIL. The grounding busbar structural parameters characterize the cross-sectional dimensions, routing path, and grounding connection point location of the grounding busbar associated with the GIL. The reinforcing mesh structural parameters characterize the mesh spacing, rebar diameter, and lap splicing method of the reinforcing mesh within the tunnel lining. The metal support structural parameters characterize the installation height, arm length, and fixing spacing of the metal supports bearing the GIL. All of these parameters are used to construct an electromagnetic field simulation model to reflect the influence of different conductive components within the tunnel on the power frequency magnetic field distribution, magnetic flux coupling, and eddy current paths.

[0084] In practical modeling, the structural parameters of the three-phase conductors can be extracted through on-site measurements, design drawings, or building information models. The structural parameters of the metal casing can be obtained from the casing manufacturing specifications and installation records. The structural parameters of the grounding busbar, the reinforcing steel network, and the metal support structure can be parametrically expressed by combining tunnel civil engineering data, grounding construction data, and equipment layout data.

[0085] Within this structural parameter system, the three-phase conductor structural parameters determine the spatial distribution basis of the main magnetic field source, while the metal shell structural parameters affect magnetic field shielding and the induced current loop. The grounding busbar structural parameters influence the stray current discharge path, the steel reinforcement network structural parameters reflect the amplification or weakening effect of the conductive continuum within the tunnel lining on magnetic field non-uniformity, and the metal support structural parameters characterize the additional coupling effect introduced by local metal attachments. By incorporating these structural parameters into the scope of associated structural parameters, a holistic characterization of the GIL (Gas Inductance Liquid) within the tunnel and its surrounding metal environment can be achieved during the model simulation phase. This allows the electromagnetic field simulation model to accurately reflect the strength, distribution range, and location of sensitive areas of the magnetic field in different sections of the tunnel.

[0086] S102. Based on the spatial distribution characteristics of electromagnetic fields, select multiple preset protection measures; implement multiple preset protection measures to provide multi-dimensional electromagnetic interference protection for the secondary system of GIL in the tunnel.

[0087] Among them, the preset protection measures refer to the set of interference suppression measures that are pre-constructed and stored in the protection measures library. This set is organized to address the sources, propagation paths and receptor coupling mechanisms of power frequency magnetic field interference in the secondary system of GIL.

[0088] In detail, the pre-set protective measures include spatial measures to adjust the layout relationship, coupling channel measures to manage the metal structure, and receiver-side measures to modify secondary cables, secondary equipment and grounding structures.

[0089] It should be noted that multi-dimensional electromagnetic interference protection refers to a comprehensive protection approach implemented around different dimensions of interference effects, including but not limited to: interference source proximity dimension, propagation path dimension, structural coupling dimension, grounding loop dimension, and secondary receptor dimension. It should be understood that electromagnetic interference protection in each dimension corresponds to at least one feasible pre-set protection measure, forming a hierarchical and combined interference suppression system.

[0090] In practice, after obtaining the spatial distribution characteristics of the electromagnetic field, the location of the secondary system is first mapped. For example, the location of the relay protection unit cabinet, the location of the measurement cable channel, and the location of the communication cable tray are superimposed with the spatial distribution characteristics of the electromagnetic field to determine the interference zone where the secondary system is currently located. Subsequently, the protection measure library is called up, and based on the interference areas included in the spatial distribution characteristics of the electromagnetic field, as well as the potential coupling enhancement areas formed by the steel reinforcement network and cable trays, several suitable preset protection measures are selected.

[0091] For example, the protective measures library includes, but is not limited to: adjusting the laying distance between secondary cables and GIL, changing the cable tray layout elevation, adjusting the interference area where the low-voltage line is located, shielding the secondary system, adjusting the connection method of the grounding busbar, optimizing the single-point grounding or multi-point grounding structure, cutting off unnecessary metal circulating loops, isolating or reconstructing the connection relationship between the steel reinforcement network and the auxiliary metal parts, using twisted-pair or shielded control cables, setting up equipotential bonding structures at the equipment interface, and providing local shell shielding for sensitive units of the secondary system.

[0092] Furthermore, based on the preset protection dimensions, the selected preset protection measures are divided into a first-dimensional protection measure set, a second-dimensional protection measure set, and a third-dimensional protection measure set. The preset protection dimensions include the first, second, and third protection dimensions.

[0093] Illustratively, in this embodiment, the first protection dimension is interference source protection, used to control the power frequency magnetic field generated during GIL operation. The second protection dimension is interference path protection, used to suppress the propagation path of the power frequency magnetic field in tunnel space, metal components, and around secondary cables. The third protection dimension is interference receiver protection, used to protect secondary equipment such as relay protection units, measurement units, and communication links, as well as their connected secondary cables. It is worth noting that the secondary equipment and secondary cables together constitute the secondary system of GIL.

[0094] In a specific example, the first-dimensional protection measures include material and structural optimizations of the GIL and improvements to the grounding system to increase the circulating current amplitude of the GIL enclosure, enhance the enclosure's ability to counteract the leakage magnetic field, and reduce the intensity of the leakage magnetic field at its source. For example, high-conductivity materials are used for critical pipe sections near secondary equipment in the GIL, flange joint contact resistance is controlled, low-impedance grounding busbars are laid along the entire length of the GIL, and multiple grounding points are set up.

[0095] The second-dimensional set of protective measures includes distance-increasing isolation measures, enclosure shielding measures, and location optimization measures to weaken the magnetic field strength penetrating to the secondary system along the propagation path. Examples include laying secondary cables at an optimal distance from the GIL, using shielding sleeves around the secondary cables, and adjusting the horizontal height of the secondary cables relative to the GIL.

[0096] The third-dimensional set of protective measures includes loop area reduction measures and surface anti-corrosion measures to enhance the anti-interference capability and long-term stability of the secondary system at the receiving end. For example, the loop area of ​​the secondary cable can be adjusted by changing the layout of the incoming and outgoing conductors, and surface treatment and application of protective conductive coatings can be performed on electromagnetic contact surfaces such as flange joints and jumper tapes.

[0097] It is evident that interference source protection constrains the side that generates electromagnetic interference, interference path protection constrains the electromagnetic coupling and transmission process, and interference receiver protection constrains the side of the secondary system that is disturbed. Together, these three constitute a layered protection framework for ultra-long-distance tunnel environments, and are applied in a systematic manner to form a multi-level, full-chain protection system from the interference source to the secondary system.

[0098] Next, the preset protective measures included in the first-dimensional protective measure set, the second-dimensional protective measure set, and the third-dimensional protective measure set are executed respectively. In one possible implementation, when executing the preset protective measures, corresponding implementation instructions can be generated for each protective measure set under each dimension, and then executed sequentially according to a preset order, or executed in parallel when the on-site conditions are met, so as to ensure that the protective effects of different dimensions can occur synergistically.

[0099] S103. After implementing each preset protection measure, the induced current of the secondary system is detected; based on the induced current, the target protection measure is selected from the preset protection measures corresponding to each dimension; based on the target protection measure, a comprehensive electromagnetic interference protection strategy is generated for the secondary system.

[0100] In a descriptive sense, induced current refers to the additional current generated in the control loop, measurement loop, communication loop, or equipment grounding branch of a secondary system under the coupling effect of a power frequency magnetic field. Induced current directly reflects the degree of electromagnetic interference experienced by the secondary system and is a core indicator for evaluating the actual suppression effect of various preset protection measures. Target protection measures refer to the measures selected from the preset protection measures included in the protection measure set across various dimensions, after induced current detection and comparison, that meet the predetermined protection requirements or perform optimally under comprehensive evaluation. The comprehensive electromagnetic interference protection strategy refers to the complete protection scheme formed by integrating the selected target protection measures according to sections, objects, and implementation sequence. This strategy guides the final deployment, rectification, and subsequent operation and maintenance verification of the secondary system.

[0101] In practice, after each preset protective measure is implemented, induced current is detected in the secondary system. The detection targets may include secondary cable cores, shielding layers, communication link shielding layers, equipment grounding branches, measurement circuits, and the equivalent interference path at the input of the protection unit. Detection methods may include clamp-on current sensors, Rogowski coils, isolated current sampling units, or high-precision power frequency current monitoring units to collect the effective value, peak value, and fluctuation range of the induced current in the target circuit under different GIL operating conditions.

[0102] To ensure comparability between different preset protection measures, a unified operating condition benchmark is used during testing. For example, data is sampled under the same load current, the same phase sequence conditions, and the same equipment operating conditions. The sampled data is then time-synchronized and filtered to eliminate occasional operating condition disturbances.

[0103] Subsequently, based on the collected induced current, this induced current is compared with a preset safe induced current threshold, and the induced current less than or equal to the preset safe induced current threshold is determined as the target induced current. The preset safe induced current threshold refers to the upper limit of the safe induced current that the secondary system can withstand in the tunnel electromagnetic environment, and its value can be set based on international electromagnetic compatibility standards.

[0104] Thus, the preset protective measures corresponding to the target induced current in the first-dimensional protective measure set, the second-dimensional protective measure set, and the third-dimensional protective measure set are the target protective measures to be selected.

[0105] Understandably, the detected induced current is first screened using a preset safe induced current threshold, and then the corresponding set of protective measures for each dimension is traced back based on the screened target induced current. This makes the invocation of target protective measures no longer dependent on experience judgment, but directly correspond to the actual induced current level.

[0106] It is worth noting that among the selected target protection measures, there may be measures with the same protective function but different parameter values. For example, different distances (200mm, 500mm, 950mm) between the center axis of the secondary cable and the nearest inner conductor of the GIL represent different preset protection strategies. The GIL typically includes three inner conductors: phase A, phase B, and phase C.

[0107] Figure 2 A scenario illustration of the electromagnetic interference protection method for the secondary system of GIL in a tunnel provided in this application embodiment. Figure 1 ,like Figure 2 As shown, the measured induced current amplitude of the secondary cable is 7.90A when the center axis of the secondary cable is 200mm away from the nearest phase inner conductor of the GIL. The induced current amplitude is 0.88A when the center axis of the secondary cable is 500mm away from the nearest phase inner conductor of the GIL. The induced current amplitude is 0.276A when the center axis of the secondary cable is 950mm away from the nearest phase inner conductor of the GIL.

[0108] For the three target protection measures of 200mm, 500mm and 950mm from the nearest inner conductor of the GIL of the secondary cable center axis, their protection functions and the preset protection dimensions are the same, only the values ​​of the distance parameters are different.

[0109] For example, Figure 3 A scenario illustration of the electromagnetic interference protection method for the secondary system of GIL in a tunnel provided in this application embodiment. Figure 2 ,like Figure 3 As shown, with the distance between the central axis of the secondary cable and the nearest phase conductor of the GIL constant, the induced current of the secondary cable without a shield is 1.18A. When the secondary cable uses an aluminum sheath shield, the induced current is 0.646A. Furthermore, when the secondary cable uses a low-carbon steel pipe with a magnetic permeability of 100-1000 as the shield, the induced current further decreases to below 0.06A. It is evident that the three target protection measures—unshielded, aluminum sheathed, and low-carbon steel pipe with a magnetic permeability of 100-1000—only differ in the shielding parameter.

[0110] For example, Figure 4A scenario illustration of the electromagnetic interference protection method for the secondary system of GIL in a tunnel provided in this application embodiment. Figure 3 ,like Figure 4 As shown, with the distance between the central axis of the secondary cable and the nearest inner conductor of the GIL constant, when the height of the secondary cable is the same as that of the inner conductor of the middle phase (B phase) of the GIL (i.e., the height of the secondary cable relative to the inner conductor of the middle phase of the GIL is 0 mm), the induced current of the secondary cable is 1.18 A. When the height of the secondary cable relative to the inner conductor of the middle phase of the GIL is 100 mm, the induced current is 1.5 A. When the height of the secondary cable relative to the inner conductor of the middle phase of the GIL is 600 mm, the induced current is 4.35 A.

[0111] Therefore, this embodiment categorizes each target protection measure by analyzing its preset parameters, protection functions, and the preset protection dimension it belongs to, resulting in at least one protection measure category. It should be understood that target protection measures with the same preset protection dimension and the same protection function, but different preset parameter values, are grouped into the same category.

[0112] In practical implementation, the dimension identifier, function identifier, and parameter identifier of each target protection measure are first extracted, and these three are used as the classification basis to establish a protection measure index table. For multiple target protection measures that are under the same preset protection dimension and have the same protection function, they are mapped to the same protection measure class according to the differences in their preset parameters, so as to compare similar target protection measures in a centralized manner.

[0113] Furthermore, in one possible implementation, for each protection measure category, the target induced current corresponding to each target protection measure is obtained and sorted in ascending order of value. The target protection measure corresponding to the top-ranked target induced current is selected as the retained object, while other similar target protection measures are deleted from the corresponding protection measure category. This ensures that within the same preset protection dimension and under the same protection function, only the target protection measure corresponding to the smallest induced current is retained, thereby reducing duplicate candidates.

[0114] After obtaining the final target protection measures, the target protection measures are integrated according to tunnel sections, equipment types, and construction sequence to generate a comprehensive electromagnetic interference protection strategy.

[0115] In a specific example, the generated comprehensive electromagnetic interference protection strategy also includes three preset protection dimensions: interference source protection, interference path protection, and interference receiver protection. In this example, under the interference source protection dimension, the comprehensive electromagnetic interference protection strategy includes: (1) in key pipe sections near the concentrated area of ​​secondary equipment, using copper-clad aluminum pipe shells (conductivity ≥ 5.8 × 10⁻⁶). 7(2) Grind the flange joint of the GIL and install parallel jumper tape to ensure that the contact resistance is ≤10μΩ. (3) Lay a 70mm cross-sectional area cable along the entire length of the tunnel. 2 The copper grounding busbar is set up with a grounding point every 50m. These grounding points are connected to the metal shell of the GIL through jumper tape to form a multi-point parallel low-resistance circulating channel. Under the interference path protection dimension, the comprehensive electromagnetic interference protection strategy includes: (1) setting the distance between the central axis of the secondary cable and the nearest phase conductor of the GIL to 500~950mm. (2) adjusting the height of the secondary cable to a horizontal position of 600mm relative to the middle phase conductor of the GIL, and ensuring that the relative height deviation between the two is controlled within ±10mm through precise measurement. (3) for secondary cables parallel to the GIL and longer than 50m, all of them are inserted into galvanized steel pipes, low carbon steel pipes or steel armored pipes with a relative permeability of 100~1000, and the two ends of the steel pipes are grounded. Under the interference receiver protection dimension, the comprehensive electromagnetic interference protection strategy includes: (1) using twisted-pair shielded cables for the secondary cable to ensure that the return and return conductors of the secondary cable are tightly twisted. The distance between the outgoing and returning conductors of the secondary cable shall be controlled within 15mm, or the outgoing and returning conductors shall be wrapped in a uniform shielding layer. (2) Remove the surface oxide film from the flange joints and the jumper connection points, and apply tin-plated, silver-plated or conductive paste coatings. The exposed metal surfaces shall be coated with epoxy resin anti-corrosion coatings, and the non-contact outer surfaces shall be coated with salt spray anti-corrosion coatings.

[0116] In summary, Figure 5 A scenario illustration of the electromagnetic interference protection method for the secondary system of GIL in a tunnel provided in this application embodiment. Figure 4 ,like Figure 5 As shown in the embodiment of this application, the electromagnetic interference protection method for the secondary system of a GIL (Gas Inductor Lighting) in a tunnel is based on a pre-constructed electromagnetic field simulation model for the tunnel to determine the spatial distribution characteristics of the electromagnetic field within the tunnel. Then, based on these characteristics, multiple preset protection measures are selected, and these measures are further divided into three preset protection dimensions: interference source protection, interference path protection, and interference receptor protection. The preset protection measures corresponding to each of the three preset protection dimensions are executed to provide multi-dimensional electromagnetic interference protection for the secondary system of the GIL in the tunnel. Further, after executing each preset protection measure, the induced current of the secondary system is detected. Each induced current is compared with a preset safe induced current threshold, and induced currents less than or equal to the preset safe induced current threshold are identified as target induced currents. Then, target protection measures corresponding to the target induced currents are selected from the preset protection measures corresponding to each of the three preset protection dimensions. Finally, based on the selected target protection measures, a comprehensive electromagnetic interference protection strategy is generated for the secondary system.

[0117] As can be seen, the electromagnetic interference protection method for the secondary system of GIL in tunnels provided in this application constructs a closed-loop optimization mechanism from electromagnetic simulation analysis, implementation of protection measures, verification of the effectiveness of the measures, to the generation of a comprehensive strategy, thereby forming a full-chain protection system for the GIL secondary system. Simultaneously, the generated comprehensive electromagnetic interference protection strategy covers the three protection dimensions of interference source, interference path, and interference receptor, and acts on different protection links respectively, thus jointly forming comprehensive protection for the secondary system. Therefore, through the comprehensive electromagnetic interference protection strategy, the systematicness, adaptability, and long-term stability of electromagnetic interference protection for the secondary system in tunnel scenarios can be improved.

[0118] Figure 6 This is a schematic diagram of the electromagnetic interference protection device for the secondary system of GIL in a tunnel provided in an embodiment of this application, as shown below. Figure 6 As shown, the electromagnetic interference protection device 60 of the secondary system of GIL in the tunnel includes: a determination module 601, a selection module 602, a protection module 603, a detection module 604, and a generation module 605.

[0119] The determination module 601 is used to determine the spatial distribution characteristics of the electromagnetic field in the tunnel based on the electromagnetic field simulation model pre-constructed for the tunnel; wherein the electromagnetic field simulation model is used to simulate the power frequency magnetic field generated by the gas-insulated metal-enclosed transmission line (GIL) in the tunnel.

[0120] Module 602 is selected to select multiple preset protection measures based on the spatial distribution characteristics of the electromagnetic field;

[0121] The protection module 603 is used to execute multiple preset protection measures to provide multi-dimensional electromagnetic interference protection for the secondary system of GIL in the tunnel; wherein, the electromagnetic interference protection under each dimension corresponds to at least one preset protection measure.

[0122] The detection module 604 is used to detect the induced current of the secondary system after each preset protection measure is implemented;

[0123] The selection module 602 is also used to select a target protection measure from the preset protection measures corresponding to each dimension based on the induced current;

[0124] The generation module 605 is used to generate a comprehensive electromagnetic interference protection strategy for the secondary system based on the target protection measures.

[0125] In one possible design, the protection module 603 includes:

[0126] The submodule 6031 is used to divide multiple preset protection measures based on preset protection dimensions to obtain a first-dimensional protection measure set, a second-dimensional protection measure set, and a third-dimensional protection measure set; wherein, the preset protection dimensions include the first protection dimension, the second protection dimension, and the third protection dimension;

[0127] The execution submodule 6032 is used to execute the preset protection measures included in the first-dimensional protection measure set, the preset protection measures included in the second-dimensional protection measure set, and the preset protection measures included in the third-dimensional protection measure set, respectively.

[0128] In one possible design, module 602 is selected, including:

[0129] Comparison submodule 6021 is used to compare the induced current with a preset safe induced current threshold.

[0130] The determination submodule 6022 is used to determine the induced current that is less than or equal to the preset safety induced current threshold as the target induced current;

[0131] Select submodule 6023 to select the target protection measure corresponding to the target induced current from the first-dimensional protection measure set, the second-dimensional protection measure set, and the third-dimensional protection measure set.

[0132] In one possible design, module 602 also includes:

[0133] The classification submodule 6024 is used to analyze the preset parameters, protection functions, and preset protection dimensions of each target protection measure, and to classify each target protection measure to obtain at least one protection measure class; among them, target protection measures that are under the same preset protection dimension, have the same protection function, but have different preset parameter values ​​are classified into the same class.

[0134] The sorting submodule 6025 is used to sort the target protection measures and corresponding target induced currents included in the protection measures class in ascending order, and determine the target protection measure corresponding to the target induced current ranked first.

[0135] The deletion submodule 6026 is used to delete other target protection measures in the protection measures class besides the target protection measure.

[0136] In one possible design, the preset protection dimensions include the first protection dimension being interference source protection, the second protection dimension being interference path protection, and the third protection dimension being interference receptor protection.

[0137] In one possible design, module 601 is defined as including:

[0138] The acquisition submodule 6011 is used to acquire the associated structural parameters and historical operating parameters of the GIL within the tunnel;

[0139] Submodule 6012 is constructed to build an electromagnetic field simulation model for the tunnel based on associated structural parameters and historical operating parameters.

[0140] The acquisition submodule 6011 is also used to acquire the real-time runtime parameters of the GIL;

[0141] The input submodule 6013 is used to input real-time operating parameters into the electromagnetic field simulation model to determine the spatial distribution characteristics of the electromagnetic field in the tunnel output by the electromagnetic field simulation model.

[0142] In one possible design, the associated structural parameters include one or more of the following: the three-phase conductor structural parameters of the GIL, the metal casing structural parameters, and the grounding busbar structural parameters, the steel reinforcement network structural parameters, and the metal support structural parameters associated with the GIL.

[0143] The electromagnetic interference protection device for the secondary system of GIL in tunnel provided in this application embodiment can be used to implement the electromagnetic interference protection method for the secondary system of GIL in tunnel in any of the above embodiments. Its implementation principle and technical effect are similar, and will not be described again here.

[0144] It should be noted that the division of the various modules in the above device is merely a logical functional division. In actual implementation, they can be fully or partially integrated into a single physical entity, or they can be physically separated. Furthermore, these modules can be implemented entirely in software via processing element calls; they can be fully implemented in hardware; or some modules can be implemented in software via processing element calls, while others are implemented in hardware. Additionally, these modules can be fully or partially integrated together, or implemented independently. The processing element here can be an integrated circuit with signal processing capabilities. During implementation, each step of the above method or each of the above modules can be completed through the integrated logic circuits in the hardware of the processor element or through software instructions.

[0145] Figure 7 A schematic diagram of the structure of the electronic device provided in this application. Figure 7 As shown, the electronic device 70 provided in this embodiment includes at least one processor 701 and a memory 702. Optionally, the electronic device 70 further includes a communication component 703. The processor 701, memory 702, and communication component 703 are connected via a bus 704.

[0146] In the specific implementation process, at least one processor 701 executes computer execution instructions stored in memory 702, causing at least one processor 701 to execute the above-mentioned electromagnetic interference protection method of the secondary system of GIL in the tunnel.

[0147] The specific implementation process of processor 701 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.

[0148] In the above embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.

[0149] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.

[0150] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0151] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the above-described electromagnetic interference protection method for the secondary system of GIL in a tunnel.

[0152] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described electromagnetic interference protection method for the secondary system of GIL in a tunnel.

[0153] The aforementioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.

[0154] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an application-specific integrated circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the device.

[0155] The division of units is merely a logical functional division; 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 coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0156] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0157] In addition, the functional units in the various embodiments of the present invention 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.

[0158] If a function 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, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0159] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0160] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope.

Claims

1. A method for electromagnetic interference protection of a secondary system of a GIL (Gas Inductor Lighting) in a tunnel, characterized in that, include: Based on a pre-constructed electromagnetic field simulation model for the tunnel, the spatial distribution characteristics of the electromagnetic field within the tunnel are determined; wherein, the electromagnetic field simulation model is used to simulate the power frequency magnetic field generated by the gas-insulated metal-enclosed transmission line (GIL) within the tunnel. Based on the spatial distribution characteristics of the electromagnetic field, multiple preset protection measures are selected; the multiple preset protection measures are executed to provide multi-dimensional electromagnetic interference protection for the secondary system of GIL in the tunnel; wherein, the electromagnetic interference protection under each dimension corresponds to at least one preset protection measure. After each preset protection measure is implemented, the induced current of the secondary system is detected; based on the induced current, a target protection measure is selected from the preset protection measures corresponding to each dimension; based on the target protection measure, a comprehensive electromagnetic interference protection strategy is generated for the secondary system.

2. The method according to claim 1, characterized in that, Implementing the aforementioned multiple preset protection measures includes: Based on preset protection dimensions, the multiple preset protection measures are divided to obtain a first-dimensional protection measure set, a second-dimensional protection measure set, and a third-dimensional protection measure set; wherein, the preset protection dimensions include the first protection dimension, the second protection dimension, and the third protection dimension; The preset protection measures included in the first dimension protection measure set, the preset protection measures included in the second dimension protection measure set, and the preset protection measures included in the third dimension protection measure set are executed respectively.

3. The method according to claim 2, characterized in that, Based on the induced current, target protection measures are selected from the preset protection measures corresponding to each dimension, including: The induced current is compared with a preset safe induced current threshold, and the induced current that is less than or equal to the preset safe induced current threshold is determined as the target induced current. Select the target protection measure corresponding to the target induced current from the first set of protection measures, the second set of protection measures, and the third set of protection measures.

4. The method according to claim 3, characterized in that, The method further includes: Analyze the preset parameters, protection functions, and preset protection dimensions of each target protection measure, and classify the target protection measures to obtain at least one protection measure class; among them, target protection measures that are under the same preset protection dimension, have the same protection function, but have different preset parameter values ​​are grouped into the same class; The target protection measures and their corresponding target induced currents included in the protection measure class are sorted in ascending order to determine the target protection measure corresponding to the target induced current that is ranked first; other target protection measures in the protection measure class except for the target protection measure are deleted.

5. The method according to claim 2, characterized in that, The preset protection dimensions include a first protection dimension of interference source protection, a second protection dimension of interference path protection, and a third protection dimension of interference receptor protection.

6. The method according to any one of claims 1 to 5, characterized in that, Based on a pre-constructed electromagnetic field simulation model for the tunnel, the spatial distribution characteristics of the electromagnetic field within the tunnel are determined, including: Obtain the associated structural parameters and historical operating parameters of the GIL within the tunnel; based on the associated structural parameters and the historical operating parameters, construct an electromagnetic field simulation model for the tunnel; Obtain the real-time operating parameters of the GIL; input the real-time operating parameters into the electromagnetic field simulation model, and determine the spatial distribution characteristics of the electromagnetic field in the tunnel output by the electromagnetic field simulation model.

7. The method according to claim 6, characterized in that, The associated structural parameters include one or more of the following: the three-phase conductor structural parameters of the GIL, the metal shell structural parameters, and the grounding busbar structural parameters, steel reinforcement network structural parameters, and metal support structural parameters associated with the GIL.

8. An electromagnetic interference protection device for a secondary system of GIL in a tunnel, characterized in that, include: The determination module is used to determine the spatial distribution characteristics of the electromagnetic field within the tunnel based on a pre-constructed electromagnetic field simulation model for the tunnel; wherein, the electromagnetic field simulation model is used to simulate the power frequency magnetic field generated by the gas-insulated metal-enclosed transmission line (GIL) within the tunnel; The selection module is used to select multiple preset protection measures based on the spatial distribution characteristics of the electromagnetic field; The protection module is used to execute the multiple preset protection measures to provide multi-dimensional electromagnetic interference protection for the secondary system of GIL in the tunnel; wherein, the electromagnetic interference protection in each dimension corresponds to at least one preset protection measure. The detection module is used to detect the induced current of the secondary system after each preset protection measure is implemented; The selection module is also used to select a target protection measure from the preset protection measures corresponding to each dimension based on the induced current; The generation module is used to generate a comprehensive electromagnetic interference protection strategy for the secondary system based on the target protection measures.

9. An electronic device, characterized in that, include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executed instructions; The processor executes the computer execution instructions stored in the memory to implement the electromagnetic interference protection method for the secondary system of GIL in the tunnel as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the electromagnetic interference protection method for the secondary system of the tunnel GIL as described in any one of claims 1 to 7.

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