Ferromagnetic material sleeve for anti-icing of alternating current transmission line and anti-icing method

Abstract

The invention discloses a ferromagnetic material sleeve for anti-icing of an alternating-current power transmission line and a deicing method, the sleeve is of an annular split structure with an opening in the axial direction and is formed by splicing two symmetrical semi-ring pieces, the semi-ring pieces are made of iron-nickel alloy materials, and an integrated cylindrical magnetic circuit is formed after the semi-ring pieces are spliced; connecting structures are arranged on the two sides of the axial openings of the semi-ring pieces and used for achieving mutual connection between the two semi-ring pieces in the assembling process. The inner wall of each semi-ring piece is provided with a heat-conducting insulating lining which is used for achieving heat conduction and electric insulation of the sleeve to the power transmission conductor. The ferromagnetic material sleeve has extremely high initial permeability and extremely low coercive force under power frequency, strong coupling and low-loss transmission of a wire magnetic field can be achieved, and the sleeve is not saturated early and can output thermal power under large current. The sleeve can be quickly assembled on an alternating-current power transmission wire to form a closed magnetic circuit under the condition of no power failure, so that magnetic flux is converted into hysteresis heat, and the sleeve is used for preventing icing of a power transmission line.

Description

Technical Field

[0001] This invention relates to the field of anti-icing equipment for power transmission lines, specifically to a ferromagnetic material sleeve and anti-icing method for AC transmission lines. Background Technology

[0002] Ultra-high voltage (UHV) AC transmission lines are the backbone of my country's power grid system, effectively supporting the interconnection and complementarity of power resources between regions through their long-distance, high-capacity transmission capabilities. However, due to the complex geographical environments along these lines, which frequently traverse areas with variable weather conditions such as mountains, rivers, and valleys, these lines face severe climatic challenges, especially in high-altitude and extremely cold regions. Frequent extreme weather events such as snow and freezing rain in winter lead to widespread and severe icing of these lines. Icing not only increases the weight of conductors and places enormous mechanical loads on towers and supporting structures, but in severe cases, it can even cause major accidents such as tower collapse and conductor breakage. Power grid interruptions caused by ice storms not only jeopardize power supply security but can also trigger large-scale blackouts, affecting economic production and residents' lives, resulting in incalculable socio-economic losses. Therefore, improving the reliability of high-voltage overhead transmission lines in complex environments and reducing the risks posed by extreme weather and geographical conditions has become a crucial issue that urgently needs to be addressed in the current power system. This will play a vital role in realizing intelligent disaster prevention for transmission lines and improving the safety, reliability, and stability of the transmission system.

[0003] To reduce energy consumption and maintenance costs, the industry has proposed using the alternating magnetic field generated by the power frequency current of conductors for non-contact electromagnetic heating, aiming to achieve on-site de-icing without changing the line operation mode or interrupting power supply. However, existing solutions using integral or thick-walled solid magnetic sleeves generally face problems such as significant circumferential eddy currents and additional losses, high standby losses under normal conditions, and temperature rise due to ineffective heating under 50Hz operating conditions. Their magnetic circuit parameters are fixed and cannot adaptively adjust the magnetic reluctance and coupling strength according to operating conditions such as line current, ice thickness, and ambient wind speed, making it difficult to simultaneously meet the contradictory requirements of "low losses under normal conditions" and "high power de-icing". In addition, the integral enclosed structure usually requires disassembly of hardware or power outage for construction, resulting in a small on-site assembly window and high operational risks. Under high current or low temperature brittle conditions, premature saturation and local hot spots are prone to occur, which can lead to reliability risks such as material annealing, performance drift, and shortened lifespan. Traditional material approaches, such as grain-oriented silicon steel and ferrite, also face trade-offs: the former struggles to balance initial permeability with low-frequency losses, while the latter suffers from low saturation flux density, high brittleness, and difficulties in magnetostriction and noise control. Long-term exposure to icing winds, salt spray, high humidity, and UV radiation leads to easy degradation of insulation and corrosion protection systems, resulting in high maintenance frequency and overall costs. In application, icing on transmission lines exhibits significant spatiotemporal inhomogeneity, with weak points concentrated near tension / suspension clamps, grading rings, and spacers. Local electric field distortion, reduced corona initiation voltage, and poor water conduction can easily lead to "ice bridging." Simply relying on overall conductor current boosting or mechanical de-icing often results in high energy consumption, unstable efficiency, and strong limitations imposed by terrain and meteorological conditions. Even with external heating elements or anti-icing coatings, engineering problems arise such as additional wind loads, water blockage and icing, coating lifespan, and recoating difficulty. Considering the above factors, current technology lacks a magnetic circuit component that can be quickly assembled without power interruption, effectively suppress eddy current loops and maintain low standby power loss during normal operation, and achieve controllable heat output using a power frequency magnetic field when icing occurs. This component also needs to have high initial permeability, high saturation flux density, low coercivity and low magnetostriction at the material level, combined with an adjustable air gap and a layered insulation structure, to meet multiple constraints such as electrical insulation, safe electric field distribution, weather resistance and corrosion resistance, and long-term mechanical locking.

[0004] Therefore, there is an urgent need for a split-type ferromagnetic material sleeve structure for AC transmission lines. Through the collaborative design of materials and structure, a balance can be achieved between magnetic-thermal conversion efficiency, assembly accessibility, and full-life reliability, providing a more economical, maintainable, and engineered solution for line icing prevention in cold and humid regions. Summary of the Invention

[0005] The purpose of this invention is to provide a ferromagnetic material sleeve and anti-icing method for AC transmission lines in order to solve the above problems. The ferromagnetic material sleeve can be quickly assembled onto the transmission line to form a closed magnetic circuit under the condition of no power interruption, so as to realize the conversion of magnetic flux into magnetic hysteresis heat. It is used for the prevention and control of icing on AC transmission lines, and is especially suitable for the operation and maintenance of transmission lines in high-altitude and cold areas with icing risk.

[0006] This invention is achieved through the following technical solution: In a first aspect, the present invention provides a ferromagnetic material sleeve for anti-icing of AC transmission lines. The sleeve is an annular split structure with an axial opening, formed by two symmetrical semi-rings. The semi-rings are made of iron-nickel alloy and, when assembled, form an integrated cylindrical magnetic circuit. The semi-rings have connecting structures on both sides of the axial opening, which are used to connect the two semi-rings during assembly. The inner wall of the semi-rings is provided with a thermally conductive and insulating liner, which is used to achieve thermal conductivity and electrical insulation of the sleeve to the transmission conductor.

[0007] As one aspect of the present invention, the connection structure includes a connecting block and a connecting groove disposed on both sides of the axial opening of the semi-ring piece, and the two semi-ring pieces are joined together to form a mortise and tenon structure through the cooperation of the connecting block and the connecting groove.

[0008] As one embodiment of the present invention, the semi-ring is provided with connecting blocks and connecting grooves on the splicing surfaces on both sides of the axis.

[0009] As one aspect of the present invention, the connecting blocks and connecting grooves on the semi-ring are both arranged to extend axially, and at least one set of cooperating connecting blocks and connecting grooves has an axial length that is less than the axial length of the sleeve.

[0010] As one embodiment of the present invention, both the connecting block and the connecting groove are dovetail-shaped structures.

[0011] As one aspect of the present invention, the thermally conductive insulating liner is disposed on the inner wall of the semi-ring by means of bonding or coating.

[0012] As one aspect of the present invention, the nickel content in the iron-nickel alloy is in the range of 45% to 80%.

[0013] As one aspect of the present invention, the semi-ring is made of cold-rolled iron-nickel alloy strip through a winding process.

[0014] As one aspect of the present invention, the thickness of the cold-rolled iron-nickel alloy strip is 0.02-0.05 mm.

[0015] In a second aspect, the present invention provides an anti-icing method for AC transmission lines based on the ferromagnetic material sleeve described in the first aspect, comprising the following steps: S1. Two semi-ring components are made of iron-nickel alloy material; S2. Under the condition of no power interruption, place the two semi-ring parts on both sides of the conductor, and connect the two semi-ring parts to form a sleeve through the connection structure, thus forming a stable closed magnetic circuit. S3. The sleeve achieves strong coupling with the power frequency magnetic field of the conductor, converting the coupled magnetic flux into magnetic hysteresis heat, which can be transferred to the ice layer to prevent icing of AC transmission lines.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects: The sleeve in this invention is formed by assembling two symmetrical semi-rings, which together constitute an integrated cylindrical magnetic circuit. Connecting structures on both sides of the axial opening of the semi-rings allow for rapid connection between the two semi-rings during assembly. Simultaneously, the inner wall of the semi-rings is lined with a thermally conductive and insulating liner, enabling the sleeve to conduct heat and provide electrical insulation to the transmission line. This split-type sleeve is made of an iron-nickel alloy, which exhibits extremely high initial permeability and extremely low coercivity at power frequency, achieving strong coupling and low-loss transmission of the conductor's magnetic field. This ensures the sleeve does not saturate prematurely under high current while still outputting thermal power. Due to its low magnetostriction coefficient, it exhibits low vibration and noise under AC excitation. This sleeve can be quickly assembled onto AC transmission lines to form a closed magnetic circuit without power interruption, achieving high permeability and low loss, and is used for line icing prevention. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 This is a perspective view of the ferromagnetic material sleeve for anti-icing of AC transmission lines in this invention; Figure 2 This is a schematic diagram of the end of the ferromagnetic material sleeve in this invention; Figure 3 This is a front view of the splicing surface of the semi-ring component of the ferromagnetic material sleeve in this invention; Figure 4 This is a schematic diagram of the ferromagnetic material sleeve being installed on a wire in this invention. Figure 5 This is a flowchart of the anti-icing method for AC transmission lines based on ferromagnetic material sleeves in this invention.

[0018] The attached diagram shows the markings and corresponding component names: 1-Transmission conductor, 2-Sleeve, 3-Half-ring, 4-Connecting block, 5-Connecting groove, 6-Thermal conductive and insulating lining. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0021] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0022] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0024] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0025] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces), unless otherwise explicitly specified.

[0026] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0027] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0028] Please refer to Figures 1 to 5 This application provides a ferromagnetic material sleeve for anti-icing of AC transmission lines. The sleeve 2 is an annular split structure with an axial opening, formed by two symmetrical semi-ring parts 3. The semi-ring parts 3 are made of iron-nickel alloy material and form an integrated cylindrical magnetic circuit after assembly. The semi-ring parts 3 are provided with connecting structures on both sides of the axial opening. The connecting structures are used to realize the mutual connection between the two semi-ring parts 3 during assembly. The inner wall of the semi-ring parts 3 is provided with a thermally conductive and insulating liner 6. The thermally conductive and insulating liner 6 is used to realize the thermal conductivity and electrical insulation of the sleeve 2 to the transmission conductor 1.

[0029] In this application, the sleeve 2 is formed by assembling two symmetrical semi-ring parts 3, which together form an integrated cylindrical magnetic circuit. Connecting structures are provided on both sides of the axial opening of the semi-ring parts 3, allowing for rapid connection between the two semi-ring parts 3 during assembly. Simultaneously, a thermally conductive and insulating liner 6 is provided on the inner wall of the semi-ring parts 3, enabling the sleeve 2 to provide both thermal conductivity and electrical insulation to the transmission conductor 1. This split-type sleeve 2 is made of iron-nickel alloy material, which exhibits extremely high initial permeability and extremely low coercivity at power frequency, enabling strong coupling and low-loss transmission of the conductor's magnetic field. This ensures that the sleeve 2 does not saturate prematurely under high current and can output thermal power. Due to its small magnetostriction coefficient, it exhibits low vibration and noise under AC excitation.

[0030] The sleeve 2 can be quickly assembled onto the AC transmission conductor 1 to form a closed magnetic circuit without power interruption. Utilizing the alternating magnetic field generated by the 50Hz current in the transmission conductor 1, the high initial permeability and low coercivity of the iron-nickel alloy achieve strong coupling, converting magnetic flux into eddy current / hysteresis heat. The heat is efficiently transferred to the ice layer via the thermally conductive insulating liner 6, achieving rapid on-site de-icing and inhibiting re-icing. This solution requires no modification to the connection between the transmission conductor 1 and the fittings, and is suitable for targeted treatment of weak points such as tension / suspension clamps, equalizing rings, and spacers. It can also be used in groups and arrays at 0.2-1.0 m pitches to form a distributed anti-icing system, featuring low energy consumption, easy maintenance, and promising engineering application prospects.

[0031] According to some embodiments of this application, the connection structure includes connecting blocks 4 and connecting grooves 5 disposed on both sides of the axial opening of the semi-ring 3. When the two semi-rings 3 are assembled, they cooperate through the connecting blocks 4 and connecting grooves 5 to form a mortise and tenon structure. In this application, the sleeve 2 is divided into two semi-rings 3 through the axial opening. When installed on the power transmission line 1, the two semi-rings 3 can be accurately and stably connected together to form the entire sleeve 2 through the connection structure.

[0032] To achieve rapid installation and disassembly of the sleeve 2, this application provides connecting blocks 4 and connecting grooves 5 on both sides of the axial opening of the semi-ring 3. When the two semi-rings 3 are assembled, the connecting blocks 4 and connecting grooves 5 cooperate to form a mortise and tenon structure. Under uninterrupted power conditions, the operator uses insulated tools to place the two semi-rings 3 on both sides of the power transmission conductor 1, then aligns the connecting blocks 4 and connecting grooves 5 on the two semi-rings 3 and slides them axially to form a closed ring. This connection structure not only achieves precise positioning of the two semi-rings 3 during installation but also provides self-locking after connection. The entire assembly process does not change the original conductor state, maintains electrical isolation from the conductor, and meets minimum electrical clearance requirements.

[0033] According to some embodiments of this application, the semi-ring 3 is provided with connecting blocks 4 and connecting grooves 5 on the mating surfaces on both sides of the axis. Each semi-ring 3 of this application has two mating surfaces, one of which has a protruding connecting block 4, and the other has a recessed connecting groove 5. When installing the sleeve 2, the connecting block 4 on one semi-ring 3 and the connecting groove 5 on the other semi-ring 3 cooperate to form a mortise and tenon structure. By providing mortise and tenon structures on both mating surfaces, this application can improve the mating accuracy, connection stability, and reliability of the two semi-ring 3.

[0034] According to some embodiments of this application, the connecting block 4 and connecting groove 5 on the semi-ring 3 are both arranged extending axially, and at least one set of cooperating connecting blocks 4 and connecting groove 5 has an axial length less than the axial length of the sleeve 2. In this application, since at least one set of cooperating connecting blocks 4 and connecting groove 5 is not provided along the full axial length of the sleeve 2, that is, one end of the connecting groove 5 does not form a through opening, when the two semi-rings 3 are joined, the connecting groove 5 and connecting block 4 can form a thrust-resistant effect, thereby axially limiting the two semi-rings 3 and aligning the ends of the two semi-rings 3.

[0035] According to some embodiments of this application, both the connecting block 4 and the connecting groove 5 are dovetail-shaped structures. By setting dovetail-shaped connecting blocks 4 and connecting grooves 5 on the mating surfaces of the two semi-ring parts 3, the two semi-ring parts 3 can be precisely positioned during installation, and the two semi-ring parts 3 can achieve self-locking after connection, preventing automatic separation.

[0036] According to some embodiments of this application, the thermally conductive insulating liner 6 is disposed on the inner wall of the semi-ring 3 by bonding or coating. Because the inner wall of the semi-ring 3 is provided with the thermally conductive insulating liner 6, it can serve both thermal conductivity and electrical insulation functions, allowing the sleeve 2 to be assembled onto the AC transmission line 1 without power interruption. Simultaneously, the generated heat can be efficiently transferred to the ice layer via the thermally conductive insulating liner 6, achieving rapid on-site ice melting and inhibiting re-icing.

[0037] According to some embodiments of this application, the nickel content in the iron-nickel alloy ranges from 45% to 80%. By using the above-mentioned nickel content iron-nickel alloy material, it has extremely high initial permeability and extremely low coercivity at power frequency, which can achieve strong coupling and low-loss transmission of the magnetic field of the conductor. This ensures that the sleeve 2 does not saturate prematurely under high current and can output heat power. Due to its small magnetostriction coefficient, it also exhibits low vibration and noise under AC excitation.

[0038] According to some embodiments of this application, the semi-ring 3 is made from cold-rolled iron-nickel alloy strip by a winding process. Of course, the semi-ring 3 can also be manufactured by other processes, such as casting.

[0039] According to some embodiments of this application, the thickness of the cold-rolled iron-nickel alloy strip is 0.02-0.05 mm.

[0040] This application provides an anti-icing method for AC transmission lines based on the ferromagnetic material sleeve 2 described above, comprising the following steps: S1. Two semi-ring parts 3 are made of iron-nickel alloy material.

[0041] In this application, cold-rolled iron-nickel alloy strip with a nickel content between 45% and 80% is used to form two symmetrical semi-ring parts 3 through a winding process. The iron-nickel alloy has high initial permeability, low coercivity, and low magnetostriction, which can achieve strong coupling and low-loss transmission of the magnetic field of the AC transmission conductor 1 under 50Hz conditions, avoiding early saturation under high current and obtaining controllable thermal power. The thickness of the cold-rolled iron-nickel alloy strip is 0.02 to 0.05 mm. After forming, it is annealed in a protective atmosphere to eliminate stress and restore magnetic properties, providing a stable and mass-producible magnetocaloric conversion basis for the split sleeve 2.

[0042] The surface of the cold-rolled iron-nickel alloy strip is coated with insulating varnish and wound under constant tension and speed conditions on an openable mandrel. Then, it is annealed in a protective atmosphere to eliminate residual stress and restore magnetic properties. After demolding, the inner and outer circles and end faces are finely trimmed, the corners are chamfered and deburred, and a thermally conductive and insulating inner lining is applied. The strip is then balanced according to the design dimensions and magnetic properties and paired to obtain two symmetrical semi-rings with consistent geometry and parameters.

[0043] The connecting structure is machined on both sides of the axial opening of the semi-ring 3. A connecting block 4 is formed on one mating surface of each semi-ring 3, and a connecting groove 5 is formed on the other mating surface. When the sleeve 2 is installed, the connecting block 4 on one semi-ring 3 and the connecting groove 5 on the other semi-ring 3 cooperate to form a mortise and tenon structure, which improves the splicing accuracy, connection stability and reliability of the two semi-ring 3, resists loosening caused by vibration and thermal cycling, and takes into account both repeatability and safety of live installation.

[0044] S2. Under the condition of no power interruption, place the two semi-ring parts 3 on both sides of the conductor respectively, and assemble the two semi-ring parts 3 into a sleeve 2 through the connection structure, and finally form a stable closed magnetic circuit.

[0045] During installation, the two semi-ring components 3 are placed on both sides of the transmission line 1. Using insulated tools, the operator aligns the connecting blocks 4 and connecting grooves 5 on the semi-ring components 3, then smoothly slides them together along the axial direction of the transmission line 1, forming a sleeve 2. This ultimately constitutes a stable closed-loop magnetic circuit and maintains reliable electrical isolation from the transmission line 1. If necessary, non-magnetic air gap shims can be inserted at the mating surface to set the coupling strength.

[0046] After sleeve 2 is assembled, ensure that it meets the design requirements. This forms a continuous, uninterrupted closed magnetic circuit within sleeve 2, minimizing magnetic leakage. The entire assembly process does not change the original state of the wires, maintaining reliable electrical isolation from the wires and meeting the minimum electrical clearance. Once it is confirmed that there are no scratches or foreign objects, it can be put into operation.

[0047] S3 and sleeve 2 achieve strong coupling with the power frequency magnetic field of transmission conductor 1, converting the coupled magnetic flux into magnetic hysteresis heat, which can be transferred to the ice layer to achieve icing prevention of AC transmission lines.

[0048] The power frequency current in a transmission line generates an alternating magnetic field around the conductor. Leveraging the high initial permeability, low coercivity, and low magnetostriction of the iron-nickel alloy, the sleeve 2 can achieve strong coupling with the power frequency magnetic field of the conductor and maintain low losses under normal conditions. When de-icing is required, the coupled magnetic flux is converted into controlled eddy currents / hysteresis heat, achieving a stable heat flux output per unit area without premature saturation. Combined with the thermally conductive insulating liner 6, the generated heat is efficiently transferred to the ice layer and re-icing is reduced, enabling rapid de-icing and anti-re-icing maintenance without power interruption.

[0049] The ferromagnetic sleeve 2 described in this application can be quickly assembled onto the outer periphery of conductors or key fittings without power interruption. Utilizing the conductor's power frequency magnetic field, it achieves on-site magnetothermal conversion for rapid de-icing and anti-re-icing maintenance, making it particularly suitable for targeted treatment of "weak points prone to icing," such as tension / suspension clamps, equalizing rings, and spacers. Compared to current-driven de-icing, external electric heating, or simple hydrophobic coating solutions, the sleeve 2 suppresses eddy current loops and has low standby losses under normal conditions. During operation, it concentrates heat and has higher energy efficiency, and requires no changes to the line operation mode or fitting connections, significantly reducing maintenance risks and construction window requirements. Thanks to the high initial permeability, low coercivity, and low magnetostriction of the iron-nickel alloy, the sleeve 2 exhibits good linearity and low noise characteristics even in high-current, low-temperature wind fields. Its modular design facilitates standardized mass production and on-demand expansion, allowing it to function as a single-point emergency de-icing device or be arrayed to form a distributed anti-icing system. It can also be linked with icing monitoring, weather forecasting, and IoT control to achieve on-demand deployment and zoned peak-shifting. Addressing the need to enhance the resilience of transmission lines in high-altitude, cold, humid, and salty sea breeze regions, as well as the demand for energy conservation under the "dual carbon" target, this sleeve 2 has good engineering feasibility and large-scale application prospects. It can form a replicable technical path in the renovation of existing lines and the supporting of new lines, and has broad application prospects and promotion value.

[0050] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A ferromagnetic material sleeve for use in AC power line de-icing, characterized in that, The sleeve is an annular split structure opened in the axial direction, formed by two symmetrical half-ring pieces, which are made of iron-nickel alloy material and form an integrated cylindrical magnetic circuit after splicing; the half-ring pieces are provided with connecting structures on both sides of the axial opening, which are used to realize the mutual connection between the two half-ring pieces during assembly; the inner wall of the half-ring piece is provided with a heat-conducting insulating lining, which is used to realize the heat conduction and electrical insulation of the sleeve to the power transmission conductor.

2. The ferromagnetic sleeve for ice prevention on AC power lines according to claim 1, characterized in that, The connecting structure includes connecting blocks and connecting grooves arranged on both sides of the axial opening of the half-ring piece, and the two half-ring pieces form a mortise and tenon structure by cooperating with the connecting blocks and connecting grooves when spliced.

3. The ferromagnetic sleeve for ice prevention on AC power lines according to claim 2, characterized in that, The half-ring piece is provided with a connecting block and a connecting groove on the splicing surface on both sides of the axis, respectively.

4. The ferromagnetic sleeve for ice prevention on AC power lines according to claim 2, characterized in that, The connecting block and the connecting groove on the half-ring piece are arranged in the axial direction, and the axial length of at least one set of cooperating connecting block and connecting groove is less than the axial length of the sleeve.

5. The ferromagnetic sleeve for ice prevention on AC power lines according to claim 2, characterized in that, The connecting block and the connecting groove are dovetail type structures.

6. The ferromagnetic sleeve for ice prevention on AC power lines of claim 1, wherein, The heat-conducting insulating lining is arranged on the inner wall of the half-ring piece by bonding or coating.

7. The ferromagnetic sleeve for ice prevention on AC power lines of claim 1, wherein, The content of nickel in the iron-nickel alloy is in the range of 45%-80%.

8. The ferromagnetic sleeve for ice prevention on AC power lines of claim 1, wherein, The half-ring piece is made of iron-nickel alloy cold-rolled strip through winding process.

9. The ferromagnetic sleeve for ice prevention on AC power lines according to claim 8, characterized in that, The thickness of the iron-nickel alloy cold-rolled strip is 0.02-0.05 mm.

10. A method of de-icing an AC power line based on a sleeve of ferromagnetic material according to any one of claims 1-9, characterized in that, The method comprises the following steps: S1, two half-ring pieces are made of iron-nickel alloy material; S2, under the condition of not stopping power, the two half-ring pieces are placed on both sides of the conductor, and the two half-ring pieces are spliced to form a sleeve through the connecting structure, finally forming a stable closed magnetic circuit; S3, the sleeve realizes strong coupling to the power frequency magnetic field of the conductor, converts the coupled magnetic flux into hysteresis heat, and the heat can be transferred to the ice layer, realizing the prevention and control of ice coating on AC transmission line.

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