Large-section high-heat-dissipation submarine cable

Abstract

The application provides a submarine cable with large cross section and high heat dissipation, which comprises an inner protective layer, a center component, a plurality of electric units, a plurality of power components and a first heat dissipation component. The inner protective layer is provided with a receiving cavity. The center component is located in the receiving cavity. The plurality of electric units are located in the receiving cavity and surround the center component. The plurality of power components are located in the receiving cavity and correspond to the plurality of electric units. The power components are configured to move the electric units towards or away from the inner protective layer. The first heat dissipation component surrounds the outer periphery of the inner protective layer and is configured to dissipate heat of the electric units contacting the inner protective layer through the inner protective layer.

Description

Technical Field

[0001] This application relates to the field of submarine cable technology, and in particular to a submarine cable with a large cross-section and high heat dissipation performance. Background Technology

[0002] Traditional three-core submarine cables have poor heat dissipation, which can easily lead to heat accumulation in the internal battery structure, affecting the normal operation of the cable. Summary of the Invention

[0003] This application provides a submarine cable with a large cross-section and high heat dissipation performance to solve the problem of poor heat dissipation in submarine cables in the known technology.

[0004] This application provides a large-section, high-heat-dissipation submarine cable, including an inner sheath, a central assembly, multiple electrical units, multiple power components, and a first heat dissipation assembly; the inner sheath has a receiving cavity; the central assembly is located within the receiving cavity; multiple electrical units are located within the receiving cavity and are arranged around the central assembly; multiple power components are located within the receiving cavity and are arranged correspondingly to the multiple electrical units, the power components being configured to move the electrical units toward or away from the inner sheath; the first heat dissipation assembly is arranged around the outer periphery of the inner sheath and is configured to dissipate heat from the electrical units in contact with the inner sheath through the inner sheath.

[0005] In one possible implementation, the power assembly includes a power base, a first support member, and a power member. The power base is connected to the central assembly, the first support member is slidably connected to the power base, and the first support member is configured to support the electrical unit. The power member is configured to provide a driving force for moving the first support member toward one side of the inner sheath.

[0006] In one possible implementation, the power assembly further includes a second support and an elastic member, the second support being located between the electrical unit and the inner protective layer, and the second support being configured to support the electrical unit, one end of the elastic member being elastically connected to the side of the second support away from the electrical unit, and the other end being elastically connected to the inner protective layer.

[0007] In one possible implementation, the second support is thermally coupled to the inner sheath and the electrical unit.

[0008] In one possible implementation, the power member is configured to provide the driving force to the first support member based on the temperature change of the environment in which the power member is located.

[0009] In a possible implementation, the central component comprises a central piece, a second heat dissipation component, and a heat conduction layer, the second heat dissipation component is arranged around the outer periphery of the central piece, the heat conduction layer is arranged around the outer periphery of the second heat dissipation component, the power seat is connected to the heat conduction layer, and the heat conduction layer is thermally coupled with the power seat and the second heat dissipation component.

[0010] In a possible implementation, the power seat is provided with a sliding groove near one side of the first support, the first support is partially and slidably accommodated in the sliding groove, the power seat is provided with a containing cavity, the sliding groove is communicated with the containing cavity, the power component is located in the containing cavity, and the second heat dissipation component is configured to adjust the temperature of the cavity in the containing cavity.

[0011] In a possible implementation, the containing cavity is provided with a phase change liquid, the phase change liquid is configured to be vaporized into a power gas after being heated, and the power gas is configured to push the first support to slide relative to the power seat; the power gas is configured to be liquefied into the phase change liquid after being cooled, and the second heat dissipation component is configured to cool the power seat.

[0012] In a possible implementation, the power component is a bimetallic strip, the bimetallic strip is configured to bend towards one side of the first support after being heated, so as to push the first support to move towards one side of the inner protective layer.

[0013] In a possible implementation, the submarine cable with large cross section and high heat dissipation further comprises an outer protective layer, and the outer protective layer is arranged around the first heat dissipation component.

[0014] The submarine cable with large cross section and high heat dissipation provided in the application moves the electric unit towards or away from the inner protective layer through the power component, when the submarine cable needs to dissipate heat, the power component pushes the electric unit to move to contact the inner protective layer, and the first heat dissipation component starts to work to dissipate heat of the electric unit, so as to improve the heat dissipation effect of the submarine cable through the active heat dissipation. After the electric unit completes heat dissipation, the power component moves the electric unit to the side away from the inner protective layer, so that the electric unit is no longer in contact with the inner protective layer, and the electric unit and the inner protective layer are in a separated state when heat dissipation is not needed, so that the electric unit is not easily affected by the pressure or the twist in the complex marine environment, and the electric unit is not damaged. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a structural schematic diagram of the submarine cable with large cross section and high heat dissipation provided in the application in an embodiment.

[0016] Figure 2 FIG. 2 is a partial structural schematic diagram of the power component of the submarine cable with large cross section and high heat dissipation provided in the application in an embodiment.

[0017] Figure 3 Structure diagram of the large cross-section high heat dissipation submarine cable in another embodiment of the present application.

[0018] Figure 4 Structure diagram of the center component of the large cross-section high heat dissipation submarine cable in an embodiment of the present application.

[0019] Figure 5 Structure diagram of the first heat dissipation component of the large cross-section high heat dissipation submarine cable in an embodiment of the present application.

[0020] Main element symbol explanation: 100, large cross-section high heat dissipation submarine cable; 10, inner protective layer; 11, accommodating cavity; 12, mounting groove; 20, electric unit; 21, conductor; 22, insulating layer; 30, center component; 31, center piece; 310, center hole; 32, second heat dissipation component; 321, second hot end layer; 322, second electric cooling main body layer; 323, second cold end layer; 33, heat conduction layer; 34, heat conduction extension; 35, gap; 40, power component; 41, power seat; 410, accommodating cavity; 411, protruding part; 412, sliding groove; 42, first support piece; 421, sliding part; 422, support part; 43, second support piece; 44, elastic piece; 45, power piece; 50, first heat dissipation component; 51, first cold end layer; 52, first electric cooling main body layer; 53, first hot end layer; 60, outer protective layer.

[0021] The following detailed description will further describe the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0022] The following description will reference the accompanying drawings so as to provide a thorough understanding of the present application. The drawings shown herein are of example embodiments of the present application. However, the present application can be embodied in many different forms and should not be construed as limited to the example embodiments set forth herein. These example embodiments are provided so that this present application will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art. Like reference numerals refer to like or similar components throughout.

[0023] The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, to the extent that the terms "including", "includes", "having", "has", "a", "an", "one" or "said one" are used in this specification and / or claims, they are intended to be inclusive (meaning that there can be additional items) and / or they are intended to be quantitatively-singular (meaning that there is no additional items). However, it will be understood by those within the art that the application can be practiced without the specific details set forth in the description.

[0024] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. Furthermore, unless expressly defined herein, terms such as those defined in a general dictionary should be interpreted as having the same meaning as they have in the relevant art and in the content of this application, and will not be interpreted as having an idealized or overly formal meaning.

[0025] The specific embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0026] like Figures 1 to 2 As shown, this embodiment provides a large-section, high-heat-dissipation submarine cable 100, including an inner sheath 10, a central component 30, multiple electrical units 20, multiple power components 40, and a first heat dissipation component 50.

[0027] The inner sheath 10 is made of an insulating and thermally conductive material, such as a plastic material with added high thermal conductivity fillers (e.g., boron nitride, alumina, graphene, etc.). The inner sheath 10 is generally a hollow cylindrical structure, and a receiving cavity 11 is provided within the inner sheath 10. The central assembly 30 is located within the receiving cavity 11, and multiple electrical units 20 are located within the receiving cavity 11, arranged around the central assembly 30. Three electrical units 20 are provided, and the three electrical units 20 are evenly spaced around the central axis of the submarine cable. Each electrical unit 20 includes a conductor 21 and an insulating layer 22 surrounding the conductor 21. In addition, the electrical unit 20 also includes a shielding layer, a waterproof layer, and other necessary layers to realize the function of the electrical unit 20.

[0028] It is understood that in other embodiments, the electrical unit 20 may also be set to two or four or other quantities, and the specific number of electrical units 20 may be selected according to actual needs.

[0029] Multiple power components 40 are located within the receiving cavity 11. Each power component 40 is correspondingly arranged with multiple electrical units 20, meaning there are three power components 40 and three electrical units 20. The power components 40 are positioned relative to the electrical units 20, and are configured to move their corresponding electrical units 20 toward or away from the inner protective layer 10. A first heat dissipation component 50 is arranged around the outer periphery of the inner protective layer 10, and is configured to dissipate heat from the electrical units 20 in contact with the inner protective layer 10 through the inner protective layer 10.

[0030] Thus, the submarine cable 100 with large cross-section and high heat dissipation capacity of the present application, by the power assembly 40, the electric unit 20 is moved towards or away from the inner sheath 10, when the submarine cable needs to dissipate heat, the power assembly 40 pushes the electric unit 20 to move to contact the inner sheath 10, the first heat dissipation assembly 50 starts to work and dissipates heat for the electric unit 20, thereby improving the heat dissipation effect of the submarine cable in an active heat dissipation manner. After the electric unit 20 completes heat dissipation, the power assembly 40 moves the electric unit 20 away from the side of the inner sheath 10, so that the electric unit 20 is no longer in contact with the inner sheath 10. When heat dissipation is not needed, it can be in a separated state with the inner sheath 10, which can avoid the submarine cable in complex marine environment due to pressure or distortion and other problems, which easily acts on the electric unit 20, resulting in damage to the electric unit 20.

[0031] Please combine Figures 1 to 4 In an embodiment, the center assembly 30 includes a center piece 31, a second heat dissipation assembly 32, and a heat conduction layer 33. The second heat dissipation assembly 32 is arranged around the outer periphery of the center piece 31, and the heat conduction layer 33 is arranged around the outer periphery of the second heat dissipation assembly 32.

[0032] The center piece 31 is generally a hollow cylindrical structure, and the center piece 31 has a center hole 310 inside. The center piece 31 can be made of a stainless steel pipe or the like structure. The second heat dissipation assembly 32 is an electric cooling structure, and the power assembly 40 is in contact with the heat conduction layer 33, so that the second heat dissipation assembly 32 can adjust the temperature of the power assembly 40 through the heat conduction layer 33. The second heat dissipation assembly 32 includes a second hot end layer 321, a second electric cooling main body layer 322, and a second cold end layer 323. The second electric cooling main body layer 322 is made of silicon-based material or III-V semiconductor material, which can realize heat transfer based on Peltier effect. When the second electric cooling main body layer 322 is powered on, it can transfer the heat of the second cold end layer 323 to the second hot end layer 321. The second electric cooling main body layer 322 can be externally connected to a power supply assembly through a conductive wire, so as to supply power to the second electric cooling main body layer 322 through the power supply assembly.

[0033] The second hot end layer 321 and the second cold end layer 323 are made of heat-conductive materials such as metal. The second hot end layer 321 is arranged around the outer periphery of the center piece 31. The heat generated by the second hot end layer 321 can be transferred to the gas in the hollow chamber in the center piece 31 through the center piece 31, and then the heat is taken away. In addition, a heat-absorbing material can be arranged in the center piece 31 to absorb the heat received by the center piece 31 from the second hot end layer 321. The second electrically cooled main body layer 322 is arranged around the outer periphery of the second hot end layer 321, and the second cold end layer 323 is arranged around the outer periphery of the second electrically cooled main body layer 322. The heat-conductive layer 33 is arranged around the outer periphery of the second cold end layer 323, and the heat-conductive layer 33 is made of heat-conductive materials such as metal, so that the second cold end layer 323 can cool the power assembly 40 through the heat-conductive layer 33. In addition, the heat-conductive layer 33 covers the second cold end layer 323, so as to avoid the second cold end layer 323 from being damaged by directly contacting the power assembly 40.

[0034] It can be understood that in other embodiments, the second electrically cooled main body layer 322 can also be a semiconductor cooling chip. The semiconductor cooling chip is embedded between the second hot end layer 321 and the second cold end layer 323, and the hot end of the semiconductor cooling chip is thermally coupled with the second hot end layer 321, and the cold end of the semiconductor cooling chip is thermally coupled with the second cold end layer 323. The number of semiconductor cooling chips is multiple, and the multiple semiconductor cooling chips are arranged in sequence and at intervals along the extension direction of the submarine cable, so as to improve the uniformity of heat dissipation.

[0035] It can be understood that in other embodiments, the second heat dissipation assembly 32 can be multiple, and the multiple second heat dissipation assemblies 32 are arranged corresponding to the multiple power assemblies 40, that is, the number of second heat dissipation assemblies 32 is three, and the three second heat dissipation assemblies 32 are arranged one by one corresponding to the three power assemblies 40. The multiple second heat dissipation assemblies 32 are arranged in sequence and at intervals around the center piece 31, so as to form the gap 35 between the adjacent two second heat dissipation assemblies 32. The heat-conductive layer 33 is also multiple, and the number of heat-conductive layers 33 is the same as the number of second heat dissipation assemblies 32. The multiple heat-conductive layers 33 are respectively arranged outside the second cold end layer 323 of the corresponding second heat dissipation assembly 32, and any heat-conductive layer 33 does not block the area where the gap 35 is located.

[0036] The outer periphery of the center piece 31 is provided with multiple heat-conductive extensions 34, and the heat-conductive extensions 34 are made of heat-conductive materials. The multiple heat-conductive extensions 34 are connected to the outer periphery of the center piece 31 and are respectively located in each gap 35. One end of the heat-conductive extension 34 is connected and thermally coupled with the center piece 31, and the other end of the heat-conductive extension 34 is in an arc structure and is supported on the inner protective layer 10, so as to support the inner protective layer 10 through the multiple heat-conductive extensions 34 cooperating with the multiple power assemblies 40. The end of the heat-conductive extension 34 away from the center piece 31 is thermally coupled with the inner protective layer 10, so as to dissipate heat of the center piece 31 through the first heat dissipation assembly 50.

[0037] Please combine Figures 1 to 4 In an embodiment, the power assembly 40 includes a power seat 41, a first support 42, and a power piece 45. The power seat 41 is connected to the heat conduction layer 33 of the center assembly 30, the first support 42 is slidably connected to the power seat 41, and the first support 42 is configured to support the electrical unit 20, and the power piece 45 is configured to provide a driving force for the first support 42 to move towards one side of the inner protective layer 10.

[0038] The power seat 41 is generally arc-shaped, and the power seat 41 is arranged on the outer circumferential surface of the heat conduction layer 33 to improve the heat transfer efficiency between the power seat 41 and the heat conduction layer 33, and to improve the stability of the support of the heat conduction layer 33 to the power seat 41. The first support 42 is thermally coupled with the power seat 41 and the electrical unit 20, and can transfer the heat generated by the electrical unit 20 to the power seat 41 through the first support 42.

[0039] Along the radial direction of the submarine cable, the power seat 41 is provided with a protrusion 411 on the side close to the first support 42. The protrusion 411 is provided with a sliding groove 412 on the side away from the power seat 41, and the power seat 41 is provided with a receiving cavity 410, and the sliding groove 412 is in communication with the receiving cavity 410. The first support 42 includes a sliding part 421 and a support part 422. The extension direction of the sliding part 421 is parallel to the radial direction of the submarine cable, one end of the sliding part 421 is slidably received in the sliding groove 412, and the other end of the sliding part 421 is connected to the support part 422. The support part 422 is generally arc-shaped, and the support part 422 is arranged on the outer circumferential surface of the electrical unit 20 to stably support the electrical unit 20 through the support part 422.

[0040] The power piece 45 is located in the receiving cavity 410, and the second heat dissipation assembly 32 is configured to adjust the temperature of the cavity in the receiving cavity 410. The second cold end layer 323 of the second heat dissipation assembly 32 is thermally coupled with the power seat 41 through the heat conduction layer 33, so that the temperature of the receiving cavity 410 of the power seat 41 can be reduced through the second heat dissipation assembly 32. The power piece 45 is located in the receiving cavity 410, and based on the temperature change of the environment where the power piece 45 is located, the power piece 45 is configured to provide a driving force to the first support 42, so as to realize the movement of the electrical unit 20 supported by the first support 42 relative to the inner protective layer 10.

[0041] In some embodiments, the three-core submarine cable is in operation, and the temperature of the three electric units 20 exceeds 130℃ due to overload or other conditions, and the area between the three electric units 20 is a temperature accumulation area, and the temperature of the area is even higher than the heat temperature of the electric units 20. The phase change liquid is arranged in the accommodating cavity 410, and the phase change liquid is the power member 45. When the temperature of the three electric units 20 accumulates, the phase change liquid vaporizes to form a power gas after being heated, and the power gas is configured to push the first support 42 to slide relative to the power seat 41. The sliding part 421 is in sliding sealing with the protruding part 411 to ensure the sealing of the accommodating cavity 410, so that the power gas formed after the phase change liquid vaporizes generates a pushing force to move the first support 42 to one side of the inner sheath 10. In addition, the sliding part 421 is a solid structure, and when the phase change liquid is in a liquid state, the length of the sliding part 421 in the sliding groove 412 is less than the depth of the sliding groove 412, so as to ensure that the power gas can smoothly push the sliding part 421 to move in the sliding groove 412.

[0042] The power gas is configured to liquefy to form the phase change liquid after being cooled, and the second heat dissipation assembly 32 is configured to cool the power seat 41. The second heat dissipation assembly 32 cools the power seat 41 until the temperature of the chamber in the power seat 41 is reduced to condense the power gas into liquid.

[0043] The phase change liquid can be water or other liquids. The boiling point of water is 100℃, and when the temperature of the electric unit 20 is higher than 100℃, the water becomes water vapor, and then the pressure in the accommodating cavity 410 increases to push the first support 42 to move. Subsequently, the second heat dissipation assembly 32 can be used to cool the power seat 41, so that the water vapor liquefies into liquid water for recycling. The specific selection of the phase change liquid can be selected according to actual design requirements, as long as the boiling point of the phase change liquid is lower than the maximum heat temperature of the electric unit 20 of the current three-core submarine cable, and the temperature required for the gas generated by the phase change liquid to liquefy can be satisfied by the second heat dissipation assembly 32.

[0044] In other embodiments, the power member 45 is a bimetallic strip, which is configured to bend towards one side of the first support 42 after being heated, and is used to push the first support 42 to move towards one side of the inner sheath 10.

[0045] The bimetallic strip is composed of two metal strips with different materials, and the thermal expansion coefficients of the two metal strips are different. After the bimetallic strip is heated, it will bend due to the difference in expansion. For example, one of the metal strips in the bimetallic strip is made of invar, and the other metal strip is made of brass. The bimetallic strip composed of the two metal strips can bend after exceeding a threshold temperature. The threshold temperature can be 70℃ or 80℃, etc. The threshold temperature can be adjusted according to the material of the bimetallic strip or the thickness of the two metal strips. The threshold temperature of the bimetallic strip can be set according to the maximum temperature of the three-core submarine cable in normal operation.

[0046] The bimetallic strip is arranged in the accommodating cavity 410, one end of the bimetallic strip can be connected to the inner wall of the power seat 41 and the heat insulation material is arranged between the two to prevent the heat of the power seat 41 from being easily transferred to the end of the bimetallic strip, the other end of the bimetallic strip is in contact with the power seat 41 and the two are thermally coupled, so that the end is bent by heat and can resist the movement of the sliding part 421.

[0047] Please combine Figures 3 to 5 In an embodiment, the power assembly 40 further comprises a second support 43 and an elastic member 44, the second support 43 is located between the electric unit 20 and the inner sheath 10, and the second support 43 is configured to support the electric unit 20, one end of the elastic member 44 is elastically connected to the side of the second support 43 away from the electric unit 20, and the other end is elastically connected to the inner sheath 10.

[0048] The second support 43 is generally arc-shaped, and the second support 43 can be attached to the inner circumferential surface of the inner sheath 10. The inner circumferential surface of the inner sheath 10 is provided with a mounting groove 12, and the elastic member 44 is a compression spring, one end of the elastic member 44 is located in the mounting groove 12 and connected to the bottom wall of the mounting groove 12, and the other end is connected to the second support 43. When the power assembly 40 is in a non-working state, the second support 43 is spaced apart from the inner sheath 10 to avoid direct contact between the second support 43 supporting the electric unit 20 and the inner sheath 10, so that the electric unit 20 and the inner sheath 10 can be buffered by the elastic member 44 to avoid damage to the electric unit 20 due to excessive force.

[0049] In particular, two elastic members 44 are provided in the same power assembly 40 to improve the stability of the two elastic members 44 supporting the second support 43. In addition, when the elastic member 44 is compressed by the second support 43, the elastic member 44 can be partially or completely accommodated in the mounting groove 12, ensuring that the second support 43 can be tightly attached to the surface of the inner sheath 10, and the second support 43 and the electric unit 20 are also in an attached state. The second support 43 is thermally coupled with the inner sheath 10 and the electric unit 20, thereby improving the heat transfer efficiency between the electric unit 20, the second support 43 and the inner sheath 10.

[0050] In this embodiment, the first heat dissipation assembly 50 comprises a first cold end layer 51, a first electric cooling main body layer 52 and a first hot end layer 53 which are sequentially wrapped around the outer periphery of the inner sheath 10. The structure and working principle of the first heat dissipation assembly 50 are the same as those of the second heat dissipation assembly 32, which will not be described here.

[0051] In this embodiment, the submarine cable 100 with large cross-section and high heat dissipation also comprises a temperature measuring optical fiber arranged in the inner sheath 10 for detecting the ambient temperature in the inner sheath 10.

[0052] When the temperature detected by the temperature measuring fiber is higher than the first temperature (the first temperature can be set as the maximum heat temperature of the submarine cable in normal working state), the second heat dissipation component 32 works to dissipate heat from the electric unit 20, so as to avoid affecting the performance of the submarine cable due to long time in high temperature state.

[0053] When the temperature at the electric unit 20 is higher than the second temperature (the second temperature can be set as the boiling point temperature of the phase change liquid or the threshold temperature of the bimetallic strip), the second temperature is higher than the first temperature, the first support 42 moves towards the inner sheath 10, and then the elastic member 44 is compressed to make the second support 43 adhere to the surface of the inner sheath 10, the first heat dissipation component 50 works, and the second heat dissipation component 32 can also work synchronously to dissipate heat from the electric unit 20 at the same time, so as to quickly cool the electric unit 20 and avoid damaging the submarine cable. When the temperature of the electric unit 20 decreases, the first heat dissipation component 50 and the second heat dissipation component 32 stop working, the elastic member 44 pushes the second support 43 to move towards the center member 31, and then the electric unit 20 is reset.

[0054] Please refer to Figure 5 In an embodiment, the submarine cable 100 with large cross section and high heat dissipation performance further comprises an outer sheath 60, and the outer sheath 60 surrounds the first heat dissipation component 50.

[0055] The heat generated by the first hot end layer 53 can be transmitted to the seawater through the outer sheath 60, and then the first hot end layer 53 is cooled.

[0056] The outer sheath 60 comprises a shielding layer, a shielding insulation layer, a copper sleeve layer, an armor layer, an outer sheath, and the like. It can be understood that the outer sheath 60 further comprises a fireproof layer, a waterproof layer, and other necessary components for forming the outer sheath 60. The specific structure of the outer sheath 60 is not limited in the present application, and can be selected according to actual needs.

[0057] In the foregoing, the specific embodiments of the present application are described with reference to the accompanying drawings. However, those skilled in the art can understand that various changes and replacements can be made to the specific embodiments of the present application without departing from the scope of the present application. These changes and replacements are within the scope defined by the present application.

Claims

1. A submarine cable having a large cross section and high heat dissipation, characterized by comprising: The application relates to a large-section high-heat-dissipation submarine cable. The submarine cable comprises an inner protective layer, a receiving cavity arranged in the inner protective layer, a central component arranged in the receiving cavity, a plurality of electric units arranged in the receiving cavity and surrounding the central component, a plurality of power components arranged in the receiving cavity and corresponding to the electric units, a first heat-dissipation component arranged around the outer periphery of the inner protective layer and configured to dissipate heat of the electric units contacting the inner protective layer through the inner protective layer, wherein the power component comprises a first support configured to support the electric unit and a power element configured to provide a driving force for moving the first support to one side of the inner protective layer; the power component further comprises a second support arranged between the electric unit and the inner protective layer and configured to support the electric unit, and an elastic element having one end elastically connected to one side of the second support away from the electric unit and the other end elastically connected to the inner protective layer. The power component comprises a power seat connected to the central component, and the first support is slidably connected to the power seat. The second support is thermally coupled to the inner protective layer and the electric unit. The power element is configured to provide the driving force for the first support based on temperature change of the environment where the power element is located. The central component comprises a central element, a second heat-dissipation component arranged around the outer periphery of the central element, and a heat-conducting layer arranged around the outer periphery of the second heat-dissipation component, wherein the power seat is connected to the heat-conducting layer, and the heat-conducting layer is thermally coupled to the power seat and the second heat-dissipation component. The power seat is provided with a sliding groove on one side close to the first support, the first support is partially and slidably accommodated in the sliding groove, the power seat is provided with a containing cavity, the sliding groove is communicated with the containing cavity, the power element is arranged in the containing cavity, and the second heat-dissipation component is configured to adjust the temperature in the containing cavity.

2. The submarine cable of claim 1, wherein, The containing cavity is provided with a phase-change liquid, the phase-change liquid is configured to be vaporized into power gas after being heated, the power gas is configured to push the first support to slide relative to the power seat, and the power gas is configured to be liquefied into the phase-change liquid after being cooled, and the second heat-dissipation component is configured to cool the power seat.

3. The submarine cable of claim 2, wherein the cable has a large cross section and high heat dissipation. The power element is a bimetallic strip, the bimetallic strip is configured to be bent towards one side of the first support after being heated, and used for pushing the first support to move to one side of the inner protective layer.

4. The submarine cable of claim 2, wherein the cable has a large cross section and high heat dissipation. The large-section high-heat-dissipation submarine cable further comprises an outer protective layer arranged around the first heat-dissipation component.

5. The submarine cable of claim 4, wherein the cable has a large cross section and high heat dissipation. ​ 6. The submarine cable of claim 5, wherein the cable has a large cross section and high heat dissipation. ​ 7. The submarine cable of claim 6, wherein the cable has a large cross section and high heat dissipation. ​ 8. The submarine cable of claim 6, wherein the cable has a large cross section and high heat dissipation. ​ 9. The submarine cable of claim 1, wherein, ​

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