Self-heating sealing ring for low-temperature high-voltage power equipment and power equipment

Abstract

The invention provides a self-heating sealing ring for low-temperature and high-voltage power equipment and the power equipment, relates to the field of power equipment, and aims to solve the problem that the sealing ring of the power equipment in an alpine region is easy to age and lose efficacy at present. The temperature of the conductor in the sealing ring base body is increased through the electromagnetic induction heating effect, so that heating is conducted from the interior of the sealing ring base body, the temperature difference between the inner ring and the outer ring of the sealing ring is reduced, the overall temperature of the sealing ring is improved, the problems of hardening, cracking, degradation or failure of rubber sealing pieces are solved, and the sealing performance of equipment is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of power equipment, and particularly to a self-heating sealing ring and a power equipment for low-temperature and high-voltage power equipment. Background Art

[0002] At the joints of oil-filled and gas-filled equipment in the power system, rubber seals are generally used. The sealing effect is achieved when the working state of rubber products is in the high elastic state of the material. For the outer shell seals of high-voltage oil and gas insulation equipment, ethylene propylene diene monomer (EPDM) rubber or nitrile rubber is generally used. Due to the poor thermal conductivity of the rubber sealing ring, when the equipment operates in a low-temperature environment, the external temperature of the rubber ring is close to the ambient temperature. The lowest temperature in alpine regions can reach below -50°C, resulting in the hardening and cracking of the commonly used rubber seals at present, and gradually developing into deterioration and failure, leading to the leakage of oil and gas in the equipment, and the mixing of external impurities such as gas and moisture into the equipment, triggering equipment failures or even failures.

[0003] Chinese Patent (Publication No. CN106764162B, Publication Date May 31, 2017) discloses a rubber heating gasket for preventing freezing and blockage of water supply and drainage pipes. The heat-conducting skeleton body includes an insulating board and a heat-conducting copper plate attached to the lower surface of the insulating board. An electric heating wire installation groove surrounding the insulating board is provided on the insulating board, and an electric heating wire is arranged in the electric heating wire installation groove. The conduction of the electric heating wire circuit is controlled by a temperature controller, and heating is carried out according to requirements for pipeline anti-freezing; it is necessary to connect a temperature controller for power supply and heating, and it is necessary to lead out the wire from the heat-conducting skeleton body, which destroys the integrity and integrity of the outside of the heat-conducting skeleton body. The lead-out position is damaged due to the influence of the external environment as a weak point, resulting in poor weather resistance; because it needs to lead out the wire, it can only be installed at the end-to-end position, and it is inconvenient to arrange for the installation position in a narrow space. It depends on the temperature controller to achieve active electric heating and is difficult to be applicable to the working conditions where it is inconvenient to repair and a large number of arrangements are required in the electrical system. Summary of the Invention

[0004] The purpose of the present invention is to provide a self-heating sealing ring and a power equipment for low-temperature and high-voltage power equipment to overcome the defects existing in the prior art. By using the alternating magnetic field around the power equipment, the conductor in the sealing ring matrix heats up by the electromagnetic induction heating effect, so as to heat from the inside of the sealing ring matrix, reduce the temperature difference between the inner and outer circles of the sealing ring, increase the overall temperature of the sealing ring, slow down the hardening, cracking, deterioration or failure problems of rubber seals, and ensure the sealing performance of the equipment.

[0005] The first object of the present invention is to provide a self-heating sealing ring for low-temperature and high-voltage power equipment, and the following scheme is adopted: It includes a sealing ring matrix and a conductor located inside the sealing ring matrix. The conductor is distributed circumferentially along the sealing ring matrix, and a closed conductive loop is formed in the sealing ring matrix for self-heating through electromagnetic induction to heat the sealing ring matrix.

[0006] Further, the conductor is coated with an insulating layer.

[0007] Further, the conductor is distributed circumferentially along the sealing ring matrix and is connected end to end to form a closed ring.

[0008] Further, the conductor is in a spiral shape, and the axis of the spiral conductor coincides with or is concentric with the axis of the sealing ring matrix.

[0009] Further, the conductor is provided with openings, and a closed conductive loop is also formed in the circumferential direction of the openings.

[0010] Further, the conductor is a hollow tubular ring, and the openings are distributed on the ring wall of the hollow ring.

[0011] Further, there are multiple openings, and the openings are circular or polygonal, making the conductor form a hollow structure.

[0012] Further, the openings are hexagonal holes.

[0013] Further, the conductor and the sealing ring matrix are deformed together to maintain the relative position between the conductor and the sealing ring matrix.

[0014] The second object of the present invention is to provide an electrical equipment using the self-heating sealing ring for low-temperature high-voltage electrical equipment as described in the first object.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are: Aiming at the problem that the sealing rings of electrical equipment in alpine regions are prone to aging and failure at present, by using the alternating magnetic field around the electrical equipment, the conductor in the sealing ring matrix is heated by the effect of electromagnetic induction, so as to heat from the inside of the sealing ring matrix, reduce the temperature difference between the inner and outer circles of the sealing ring, increase the overall temperature of the sealing ring, slow down the hardening, cracking, deterioration or failure of rubber sealing parts, and ensure the sealing performance of the equipment.

[0016] Also aiming at the problems of inconvenient layout and poor weather resistance of existing actively heated seals, the conductor is heated by the effect of electromagnetic induction to realize heating from the inside of the sealing ring matrix. This self-heating method does not require an external power supply and complex temperature control equipment, avoids the problems brought by external wires and temperature controllers in the prior art, avoids the damage to the integrity of the gasket, enables the sealing ring to be applicable to various narrow spaces, and is convenient for installation.

[0017] The conductors are distributed circumferentially along the sealing ring matrix and are connected end to end to form a closed ring, or are in a spiral shape with the axis coinciding or concentric with the axis of the sealing ring matrix. In addition, there are various structural forms such as the conductors being provided with openings and the openings also forming a closed conductive loop circumferentially. This ensures that the conductors can effectively induce an alternating magnetic field to generate heat, and also makes the structure of the conductors more reasonable, adapting to different application scenarios and requirements. The conductors and the sealing ring matrix deform together to maintain the relative positions of the conductors and the sealing ring matrix, so that during the operation of the equipment, even if the sealing ring undergoes certain deformation or external force, the conductors can still work normally and continuously exert the function of self-heating, ensuring the stability and reliability of the sealing ring.

[0018] The openings form a hollow structure, which while ensuring the integrity of the conductive loop, reduces the weight of the sealing ring and the equipment load; the heat generated by the conductors through electromagnetic induction can be more evenly transferred to the sealing ring matrix through the hollow structure, reducing the local temperature difference and improving the overall heating effect, and is also conducive to the uniform distribution of heat; while ensuring the functions of the conductors, the hollow structure reduces the usage amount of conductor materials and lowers the cost. The inside and outside of the hollow structure of the conductors are both filled with the sealing ring matrix, which can occupy the space of the hollow part without affecting the sealing performance, making the whole structure more compact and effectively utilizing the space. The structure in which the conductors and the sealing ring matrix are nested with each other enables the two to work better together during deformation and jointly adapt to various stresses and working condition changes during the operation of the equipment, enhancing the stability and reliability of the entire sealing ring structure.

[0019] The opening shape of the hexagonal holes makes the distribution of the magnetic field inside the conductors more in line with requirements, which is conducive to improving the efficiency of electromagnetic induction, enabling the conductors to generate heat more effectively, and indirectly increasing the heating performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The schematic diagrams in the specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0021] Figure 1 It is a schematic structural diagram of a self-heating sealing ring for low-temperature high-voltage electrical equipment with the conductors in a spiral shape in one or more embodiments of the present invention.

[0022] Figure 2 It is a schematic structural diagram of a self-heating sealing ring for low-temperature high-voltage electrical equipment with the openings being hexagonal holes in one or more embodiments of the present invention.

[0023] Figure 3 It is a schematic comparison diagram of the surface temperatures of the sealing rings under different forms of conductors in one or more embodiments of the present invention.

[0024] Among them, 1. sealing ring matrix; 2. conductor; 3. opening. Detailed implementation mode

[0025] Embodiment 1 In a typical embodiment of the present invention, as Figures 1 - 3 shown, a self-heating sealing ring for low-temperature and high-voltage power equipment is provided.

[0026] In order to improve the damage caused by low temperature to the sealing ring during the operation of power equipment in a cold environment, this embodiment provides a self-heating sealing ring for low-temperature and high-voltage power equipment. By sealing a conductor 2 that can generate eddy currents inside the sealing ring matrix 1, the conductor 2 utilizes the electromagnetic induction heating effect to achieve self-heating under the action of the leakage magnetic field of the power equipment, thereby heating the seal, realizing the self-heating of the entire sealing ring, reducing the temperature difference between the inside and outside of the rubber sealing ring, and increasing the overall temperature of the self-heating sealing ring for low-temperature and high-voltage power equipment.

[0027] As Figure 1 and Figure 2 shown, the self-heating sealing ring for low-temperature and high-voltage power equipment includes a sealing ring matrix 1 and a conductor 2. According to the principle of electromagnetic induction, there is an alternating magnetic field around the power equipment, and the alternating magnetic field generates eddy currents in the conductor 2, causing the conductor 2 to heat up. Generally, the seal is installed at the joint of the equipment housing, and there is a certain density of leakage magnetic field at this position. This embodiment precisely utilizes the electromagnetic induction heating effect to heat up the self-heating sealing ring for low-temperature and high-voltage power equipment. In this embodiment, the "low-temperature" environment refers to the extreme low-temperature environment that the power equipment may face when operating in alpine regions, and the specific temperature range usually can reach below -50°C. "High voltage" means that this embodiment is applicable to the voltage range of high-voltage power equipment. The high-voltage level usually refers to the voltage level above 1000V. In this embodiment, high-voltage power equipment mainly involves voltage levels of 110kV and above (such as 110kV, 220kV, 500kV, etc.), and typical application scenarios include high-voltage power transmission and transformation equipment, GIS (gas-insulated switchgear), etc.

[0028] The hardness of the seal for the high-voltage power equipment is above 60 HA. The cross-sectional diameter of the O-ring seal used is greater than 200 mm, and the cross-sectional area of the corresponding rectangular side of the rectangular seal used is also greater than 200 mm². In this regard, the self-heating seal for low-temperature high-voltage power equipment in this embodiment can be configured as an O-ring seal or a rectangular seal according to requirements, and the cross-sectional dimensions can also meet the requirements of high-voltage power equipment. At the same time, a conductor 2 capable of generating eddy currents is integrally encapsulated in the seal matrix 1, and the conductor 2 forms a closed conductive loop within the seal matrix 1. Since the conductor 2 has resistance, heat will be generated when current passes through. The conductor 2 induces an alternating magnetic field during the operation of the equipment to generate eddy current heating, realizing the self-heating of the entire self-heating seal for low-temperature high-voltage power equipment, reducing the temperature difference inside and outside the seal matrix 1, and raising the temperature of the entire self-heating seal for low-temperature high-voltage power equipment to resist the external low temperature and slow down the deterioration and failure of the seal.

[0029] By increasing the overall temperature of the seal through self-heating, it can effectively slow down the problems of hardening, cracking, deterioration or failure of rubber seals caused by low temperature, maintain the elasticity and flexibility of the rubber, and thus ensure the sealing performance of the equipment, prevent the leakage of oil and gas in the equipment and the mixing of external impurities such as gas and moisture, and avoid causing equipment failures. It does not rely on external heating equipment or temperature controllers, etc., and can generate heat on its own using the alternating magnetic field around the power equipment itself. It is applicable to working conditions where it is inconvenient to repair and a large number of installations are required in the electrical system, and has high adaptability and reliability.

[0030] In one implementation form of this embodiment, the conductor 2 is coated with an insulating layer. In this embodiment, the implanted conductor 2 uses a wire with an insulating layer, and the conductor 2 inside the wire can be a copper core, an aluminum core, a silver core or a gold core. The metal of the conductor 2 inside the wire has good electrical conductivity and can effectively generate electromagnetic induction heating. Among them, the copper core has the advantages of good electrical conductivity, high mechanical strength, strong corrosion resistance, etc., and is a relatively common choice; the aluminum core has the characteristics of light weight and low cost; the silver core and the gold core have better electrical conductivity, but higher costs, and are generally used in special occasions with extremely high performance requirements.

[0031] In addition, in order to ensure the heating effect and meet the sealing performance requirements of the seal, the cross-sectional diameter size of the conductor 2 implanted in the seal matrix 1 is set to 5% - 35% of the minimum cross-sectional diameter of the self-heating seal for low-temperature high-voltage power equipment. If the cross-sectional size of the conductor 2 is too small, the generated heat will be insufficient, and it will be impossible to effectively heat the seal matrix 1, making it difficult to achieve the purpose of preventing the low-temperature deterioration of the rubber seal; if the cross-sectional size is too large, on the one hand, the cost will increase, and on the other hand, it will affect the overall structure and sealing performance of the seal, reduce the elasticity of the seal, and make it difficult to achieve a good sealing effect.

[0032] The implanted conductor 2 is connected end to end to form a closed loop, allowing the current generated by electromagnetic induction to continuously flow in the conductor 2, thereby generating continuous heat. The conductor 2 is completely enclosed inside the sealing ring matrix 1, which can protect the conductor 2 from being eroded and damaged by the external environment, extend its service life, and at the same time ensure the appearance integrity and sealing performance of the sealing ring.

[0033] It should be noted that the implanted conductor 2 has the characteristic of no displacement during overall deformation. When the compression amount of the rubber ring is 25% - 30%, the implanted conductor 2 does not produce axial and radial displacements. In actual use, the rubber sealing ring will be subjected to a certain compression force and will deform. If the implanted conductor 2 displaces in this case, it may cause a change in the relative position between the conductor 2 and the sealing ring matrix 1, affecting the uniformity of the heating effect, and may even cause problems such as breakage and short circuit of the conductor 2, thereby affecting the performance and service life of the entire sealing ring. Ensuring that the conductor 2 does not displace and enabling the conductor 2 to deform and adapt along with the sealing ring matrix 1 can ensure that under various working conditions, the conductor 2 can stably generate heat and uniformly heat the sealing ring matrix 1, maintaining the sealing performance of the sealing ring.

[0034] In another implementation form of this embodiment, the conductor 2 is distributed circumferentially along the sealing ring matrix 1 and connected end to end to form a closed ring. The conductor 2 implanted in the sealing ring matrix 1 has the same shape as the sealing ring, which helps to evenly utilize the heat generated by electromagnetic induction, enabling the sealing ring matrix 1 to be heated more evenly. The closed ring structure can generate a relatively stable and uniform induced current in the alternating magnetic field, thereby generating relatively consistent heat in the entire circumferential direction, avoiding local overheating or overcooling, and being beneficial to maintaining the consistency of the overall performance of the sealing ring.

[0035] The diameter of the cross-section of the closed ring formed by the conductor 2 is less than 80% of the cross-section diameter of the self-heating sealing ring for low-temperature high-voltage electrical equipment and greater than 30% of the cross-section diameter of the self-heating sealing ring for low-temperature high-voltage electrical equipment, preventing the conductor 2 from being too close to the outer edge and inner edge of the self-heating sealing ring for low-temperature high-voltage electrical equipment, reducing external extrusion or wear, and affecting its performance and safety.

[0036] When the axis of the annular distribution corresponding to the conductor 2 coincides with the axis of the annular distribution corresponding to the self-heating sealing ring for low-temperature high-voltage electrical equipment, the heating uniformity can be ensured, and the temperature change of the self-heating sealing ring for low-temperature high-voltage electrical equipment in the circumferential direction is small. Moreover, it is set that the offset of the axis of the conductor 2 relative to the axis of the self-heating sealing ring for low-temperature high-voltage electrical equipment in the outer diameter direction does not exceed 30%, which reduces the problem that the wrapping thickness of the sealing ring matrix 1 at some positions for the conductor 2 is too small. At the same time, according to the specific equipment structure and magnetic field distribution, the position of the conductor 2 can be finely adjusted to better utilize the magnetic field energy and improve the heating effect. An excessive offset will cause uneven heating inside the sealing ring and affect the sealing performance.

[0037] In another implementation form of this embodiment, as Figure 1 shown, the conductor 2 is in a spiral shape, and the axis of the spiral-shaped conductor 2 coincides with or is concentric with the axis of the sealing ring matrix 1. The design of the spiral-shaped conductor 2 helps to more flexibly adjust the distribution of electromagnetic induction and the mode of heat generation. When the axis of the spiral-shaped conductor 2 coincides with or is concentric with the axis of the sealing ring matrix 1, a relatively uniform magnetic field distribution can be formed inside the sealing ring, and then relatively uniform heat can be generated, which can make the heat transfer more uniformly in both the circumferential and radial directions of the sealing ring. Compared with the simple annular conductor 2, the spiral shape increases the interaction area and path length between the conductor 2 and the magnetic field, which will improve the efficiency of electromagnetic induction and thus more effectively heat the sealing ring matrix 1.

[0038] Among them, the pitch of the spiral-shaped conductor 2 can be 1 mm - 10 mm, which can make the heat distribute more uniformly inside the sealing ring while ensuring the electromagnetic induction effect. The specific pitch can be optimized and adjusted according to factors such as the size, material of the sealing ring, and parameters of the electromagnetic induction equipment.

[0039] The diameter corresponding to the cross-section of the conductor 2 can be set to 50% to 80% of the cross-section diameter of the self-heating sealing ring for low-temperature high-voltage electrical equipment to ensure the performance of the self-heating sealing ring for low-temperature high-voltage electrical equipment. At the same time, similar to the previous implementation method, the axis position of the implanted conductor 2 coincides with the axis position of the self-heating sealing ring for low-temperature high-voltage electrical equipment, or the axis position of the implanted conductor 2 is offset in the outer diameter direction of the self-heating sealing ring for low-temperature high-voltage electrical equipment by no more than 50%. The coincidence of the axes helps to ensure the heating uniformity. And allowing an offset in the outer diameter direction of the sealing ring of no more than 50% is to adjust the position of the conductor 2 according to the actual magnetic field distribution and equipment structure characteristics in some special cases to better utilize the magnetic field energy and improve the heating efficiency.

[0040] It can be understood that in this embodiment, the axis of the conductor 2 refers to the axis in the direction in which the conductor 2 extends into a loop, and the cross-section of the conductor 2 refers to the cross-section perpendicular to the axis direction of the conductor 2.

[0041] In another implementation form of this embodiment, an opening 3 is provided on the conductor 2, and a closed conductive loop is also formed in the circumferential direction of the opening 3. On the one hand, the opening 3 changes the effective conductive area of the conductor 2, increases the number of formed closed conductive loops, and enhances the local electromagnetic induction effect, thereby generating more heat. On the other hand, the circumferential closed conductive loop ensures the overall electrical conductivity continuity, enabling the electromagnetic induction to proceed continuously and stably, providing a stable heat source for heating the sealing ring matrix 1.

[0042] The conductor 2 forms a hollow tubular ring, and the openings 3 are distributed on the ring wall, optimizing the electromagnetic induction and heating effects. The hollow structure can reduce the weight of the conductor 2, and at the same time change the magnetic field distribution to a certain extent, making the magnetic field more evenly distributed inside and around the ring, which is beneficial to improving the heating uniformity.

[0043] The opening 3 forms a hollow structure, which reduces the weight of the sealing ring while ensuring the integrity of the conductive loop, reducing the equipment load; the heat generated by the conductor 2 through electromagnetic induction can be more evenly transferred to the sealing ring matrix 1 through the hollow structure, reducing the local temperature difference, improving the overall heating effect, and being beneficial to the uniform distribution of heat.

[0044] While ensuring the function of the conductor 2, the hollow structure reduces the material usage of the conductor 2, reducing the cost. The inside and outside of the hollow structure of the conductor 2 are both filled with the sealing ring matrix 1, which can occupy the space of the hollow part without affecting the sealing performance, making the whole structure more compact, effectively utilizing the space. The nested structure of the conductor 2 and the sealing ring matrix 1 enables the two to work better together during deformation, jointly adapting to various stresses and working conditions changes during the operation of the equipment, enhancing the stability and reliability of the entire sealing ring structure.

[0045] The opening 3 is designed to be circular or polygonal, forming a hollow structure, increasing the interaction area between the conductor 2 and the magnetic field, and also changing the distribution form of the magnetic field to meet the heating requirements of the sealing ring.

[0046] As Figure 2 shown, the implanted conductor 2 is a hollow ring, with the overall shape the same as that of the sealing ring. The side length of the hexagonal hole at the hollow position is 1 mm - 10 mm, and the outer diameter of the ring corresponding to the hollow ring structure is 50% to 80% of the outer diameter size of the ring corresponding to the self-heating sealing ring for low-temperature high-voltage electrical equipment. The axis position of the implanted conductor 2 coincides with the axis position of the self-heating sealing ring for low-temperature high-voltage electrical equipment, or the axis position of the implanted conductor 2 deviates no more than 50% towards the outer diameter direction of the self-heating sealing ring for low-temperature high-voltage electrical equipment.

[0047] In another implementation of this embodiment, an opening 3 is formed on the conductor 2 to form a hollow structure. The opening 3 is a rhombic hole, and the side length of the rhombic hole is 1 mm - 10 mm.

[0048] Simulate the magnetic field intensity at the flange of the 110 kV GIS outdoor equipment, and conduct self-heating effect tests for different forms of implanted conductors 2 under different ambient temperature conditions, as Figure 3 shown.

[0049] Simulate the magnetic field intensity at the flange of the 110 kV GIS outdoor equipment. Under different load working conditions, it is 50 - 200 μT (microtesla), and the test uses 150 μT under rated operating conditions. The compression rate of the self-heating sealing ring for low-temperature and high-voltage power equipment is 25%, and it is compressed using a metal mold. Place the self-heating sealing ring for low-temperature and high-voltage power equipment with different forms of implanted conductors in a variable-temperature environment containing a 150 μT magnetic field, and the temperature change range is from -55°C to 10°C. After each temperature change, keep the temperature and magnetic field stable for 2 h and then test the surface temperature of the sealing ring. The test interval is 5°C, and the test results are as Figure 3 shown.

[0050] The self-heating effect of forming a hollow ring structure by opening hexagonal holes on the conductor 2 is the best. The temperature difference between the surface temperature of the rubber ring and the ambient temperature is 17.2°C. The self-heating effect of forming a hollow ring structure by opening rhombic holes on the conductor 2 is similar to that of the hexagonal hollow ring; the surface temperatures of the self-heating sealing rings implanted with the closed-ring conductor 2 and the spiral-shaped conductor 2 are close, and the self-heating effects are similar.

[0051] Embodiment 2 In another typical implementation manner of the present invention, as Figures 1 - 3 shown, a power equipment is given.

[0052] Among them, the power equipment uses the self-heating sealing ring for low-temperature and high-voltage power equipment as in Embodiment 1.

[0053] Aiming at the problem that the sealing rings of power equipment in alpine regions are prone to aging and failure at present, utilize the alternating magnetic field around the power equipment to heat up the conductor 2 in the sealing ring matrix 1 by the electromagnetic induction heating effect, so as to heat from the inside of the sealing ring matrix 1, reduce the temperature difference between the inner and outer circles of the sealing ring, increase the overall temperature of the sealing ring, slow down the hardening, cracking, deterioration or failure problems of rubber sealing parts, and ensure the sealing performance of the equipment.

[0054] The good effects obtained by the power equipment come from the self-heating sealing ring for low-temperature and high-voltage power equipment, which has been described in Embodiment 1 and will not be elaborated here.

[0055] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A self-heating sealing ring for low-temperature and high-voltage electrical equipment, characterized in that, It includes a sealing ring matrix and a conductor located inside the sealing ring matrix. The conductor is distributed circumferentially along the sealing ring matrix, and a closed conductive loop is formed in the sealing ring matrix for self-heating through electromagnetic induction to heat the sealing ring matrix.

2. The self-heating sealing ring for low-temperature and high-voltage electrical equipment according to claim 1, characterized in that The conductor is coated with an insulating layer.

3. The self-heating sealing ring for low-temperature and high-voltage electrical equipment according to claim 1, wherein The conductor is distributed circumferentially along the sealing ring matrix and is connected end to end to form a closed ring.

4. The self-heating sealing ring for low-temperature and high-voltage electrical equipment according to claim 3, wherein The conductor is in a spiral shape, and the axis of the spiral conductor coincides with or is concentric with the axis of the sealing ring matrix.

5. The self-heating sealing ring for low-temperature high-voltage electrical equipment according to claim 3, wherein Openings are provided on the conductor, and a closed conductive loop is also formed circumferentially in the openings.

6. The self-heating sealing ring for low-temperature and high-voltage electrical equipment according to claim 5, wherein, The conductor is in the shape of a hollow tubular ring, and the openings are distributed on the wall of the hollow ring.

7. The self-heating sealing ring for low-temperature and high-voltage electrical equipment according to claim 6, wherein, A plurality of the openings are provided, and the openings are circular or polygonal, so that the conductor forms a hollow structure.

8. The self-heating sealing ring for low-temperature and high-voltage electrical equipment according to claim 7, wherein The opening is a hexagonal hole.

9. The self-heating sealing ring for low-temperature high-voltage electrical equipment according to claim 3, characterized in that, The conductor and the sealing ring matrix are deformed together to maintain the relative position between the conductor and the sealing ring matrix.

10. An electrical device, characterized in that, Use the self-heating sealing ring for low-temperature high-voltage electrical equipment according to any one of claims 1-9.

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