Ocean new energy power generation land-sea connecting cable

Abstract

The utility model discloses a kind of land-sea connecting cable for marine new energy power generation, comprising: wire core, first waterproof layer, isolating sleeve, second humidity monitoring unit, second waterproof layer, wire core includes: conductor, first humidity monitoring unit, insulating layer, insulating layer is wrapped inside with first humidity monitoring unit to conductor, first waterproof layer is wrapped outside wire core, isolating sleeve is wrapped outside first waterproof layer, second humidity monitoring unit is wrapped outside isolating sleeve, second waterproof layer is wrapped outside second humidity monitoring unit. Humidity monitoring is carried out at wire core by first humidity monitoring unit, humidity monitoring is carried out between waterproof layer by second humidity monitoring unit, to form composite monitoring structure, can realize early warning to water seepage problem, meanwhile, isolating sleeve enhances the mechanical strength and flame retardance of cable, and waterproof layer is commonly composed multiple protective structure, the reliability, security and service life of cable in harsh marine environment are significantly improved.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and in particular to a land-sea connection cable for marine new energy power generation. Background Technology

[0002] With the continuous growth of global demand for clean energy, the development of marine renewable energy sources (such as offshore wind power, tidal energy, and wave energy) has become an important direction for energy development. Marine renewable energy power generation systems are typically located in sea areas far from land, requiring onshore-sea connection cables to transmit electricity to the terrestrial power grid. However, the marine environment is characterized by high salt spray, high humidity, strong corrosiveness, complex mechanical stresses (such as wave impact and ocean currents), and extreme climatic conditions (such as low temperatures and typhoons), which places extremely high demands on the performance of onshore-sea connection cables.

[0003] Currently, common offshore power cables on the market are prone to corrosion in salt spray environments, affecting their electrical performance. Furthermore, once liquid enters the cable, existing cables cannot effectively monitor this situation. Utility Model Content

[0004] This application provides a land-sea connection cable for marine new energy power generation, which improves the waterproof performance of the cable and enables the detection function of water seepage inside the cable.

[0005] This application provides an embodiment of a land-sea connection cable for marine new energy power generation, comprising: The wire core includes: a conductor, a first humidity monitoring unit, and an insulating layer, wherein the insulating layer encloses the conductor and the first humidity monitoring unit inside the wire core. The first waterproof layer is fitted over the outside of the wire core; An isolation sleeve, fitted over the outside of the first waterproof layer, is used to improve the mechanical and flame-retardant properties of the cable. The second humidity monitoring unit is fitted onto the outside of the isolation sleeve; The second waterproof layer is fitted onto the outside of the second humidity monitoring unit.

[0006] The beneficial effects of the above embodiments are as follows: by using the first humidity monitoring unit to monitor humidity at the core and the second humidity monitoring unit to monitor humidity between the waterproof layers, a composite monitoring structure is formed, which can provide early warning of water seepage problems. At the same time, the isolation sleeve enhances the mechanical strength and flame retardancy of the cable, and together with the waterproof layer, they form a multi-protection structure, which significantly improves the reliability, safety and service life of the cable in harsh marine environments.

[0007] Based on the above embodiments, the embodiments of this application can be further improved as follows: In one embodiment of this application: the conductors are multiple and form a cable core, the cable core further includes: a filler and a wrapping tape, the wrapping tape is wrapped around the outside of the cable core, and the filler is disposed between the wrapping tape and the conductors. The beneficial effect of this step is that by tightly integrating multiple conductors through the filler and wrapping tape, the roundness of the cable core is significantly improved, ensuring that the cable is not easily deformed or damaged under external force, thus improving the mechanical properties of the cable.

[0008] In one embodiment of this application: the first waterproof layer includes: a first sheath and a waterproof longitudinal sleeve, the waterproof longitudinal sleeve being fitted onto the first sheath; the second waterproof layer includes: a second P sheath. The beneficial effect of this step is: improving the waterproof effect through the waterproof layer.

[0009] In one embodiment of this application: the first humidity monitoring unit and the single filament of the conductor form a twisted structure. The beneficial effect of this step is that twisting the first humidity monitoring unit with the single filament of the conductor avoids the problem of an uneven cable cross-section caused by setting up the first humidity monitoring unit alone, thus optimizing the internal structure of the cable.

[0010] In one embodiment of this application, it further includes an armor layer, which is fitted onto the insulating sleeve. The beneficial effect of this step is that it greatly improves the mechanical properties and structural stability of the cable.

[0011] In one embodiment of this application: the second humidity monitoring unit and the metal wire of the armor layer are arranged side by side and wound around the outside of the isolation sleeve. The beneficial effect of this step is that by winding the second humidity monitoring unit and the metal wire of the armor layer side by side around the outside of the isolation sleeve, the problem of an uneven cable cross-section caused by setting up the second humidity monitoring unit alone is avoided, thus optimizing the internal structure of the cable.

[0012] In one embodiment of this application, it further includes an outer sheath, which is fitted onto the second waterproof layer. The beneficial effect of this step is that the outer sheath improves the mechanical and protective properties of the cable. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0014] Figure 1 A schematic diagram of the structure of a land-sea connection cable for marine new energy power generation.

[0015] Among them, 1 is the wire core, 101 is the conductor, 102 is the first humidity monitoring unit, 103 is the insulation layer, 104 is the filler, 105 is the wrapping tape, 2 is the first waterproof layer, 201 is the first sheath, 202 is the waterproof longitudinal wrapping, 3 is the isolation sleeve, 4 is the second humidity monitoring unit, 5 is the second waterproof layer, 501 is the second sheath, 6 is the armor layer, and 7 is the outer sheath. Detailed Implementation

[0016] In this application, unless otherwise expressly specified and limited, the terms used should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. If electrical or electronic equipment is involved, it can also refer to an electrical connection or a communication signal connection, etc. For those skilled in the art, the specific meaning of different terms in this utility model can be understood according to the specific circumstances, and the scope of the specific meaning should be limited to achieving the function of this application.

[0017] In the description of this application, it should be understood that the directional terms or positional relationships described are based on the orientation or positional relationships shown in the accompanying drawings, or based on the orientation or positional relationships in actual use, and are only for the purpose of facilitating the description of the contents 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, and therefore should not be construed as a limitation of this utility model.

[0018] like Figure 1 As shown, a land-sea connection cable for marine new energy power generation includes: a conductor 1, a first waterproof layer 2, an isolation sleeve 3, a second humidity monitoring unit 4, and a second waterproof layer 5. The conductor 1 includes: a conductor 101, a first humidity monitoring unit 102, and an insulation layer 103. The insulation layer 103 houses the conductor 101 and the first humidity monitoring unit 102 on the inner side. The first waterproof layer 2 is housed on the outer side of the conductor 1, and the isolation sleeve 3 is housed on the outer side of the first waterproof layer 2 to improve the mechanical properties and flame retardant properties of the cable. The second humidity monitoring unit 4 is housed on the outer side of the isolation sleeve 3, and the second waterproof layer 5 is housed on the outer side of the second humidity monitoring unit 4.

[0019] Specifically, the conductor is made of aluminum alloy, ensuring good oxidation and corrosion resistance as well as mechanical strength, enabling the cable to operate stably in humid environments. Furthermore, considering the cable's long-term use in harsh marine environments, an anti-corrosion coating is applied to the conductor. Specifically, an 8μm~15μm layer of phosphate-based corrosion inhibitor is sprayed onto the conductor, along with embedded water-blocking powder to prevent moisture from diffusing longitudinally along the conductor.

[0020] Specifically, the insulation uses cross-linked polyethylene insulation and cross-linked ethylene-propylene insulation extrusion to ensure that the cable can operate safely and stably at -40℃ or lower temperatures.

[0021] Specifically, such as Figure 1 As shown, the cable core consists of multiple conductors forming a cable core. The cable core also includes a filler 104 and a wrapping tape 105. The wrapping tape 105 is wound around the outside of the cable core, and the filler 104 is positioned between the wrapping tape 105 and the conductors. By tightly integrating the multiple conductors through the filler and wrapping tape, the roundness of the cable core is significantly improved, ensuring that the cable is not easily deformed or damaged under external forces, thus improving the cable's mechanical properties.

[0022] Specifically, the filler should be a non-hygroscopic filler compatible with the insulation, and the wrapping tape should be halogen-free, low-smoke, and highly flame-retardant glass fiber tape. When filling, it should be ensured that it is tight and without gaps, and the halogen-free, low-smoke, and highly flame-retardant glass fiber tape should be overlapped and wrapped tightly.

[0023] Specifically, such as Figure 1 As shown, the cable also includes an armor layer 6, which is fitted onto an isolation sleeve. The armor layer greatly improves the cable's mechanical properties and structural stability.

[0024] Specifically, the armor layer uses a metal wire structure. To prevent corrosion from moisture or chloride salts, a high-strength strapping should be wrapped around the armor layer for securing it, and a 0.15mm thick vapor-phase rust-preventive tape should be applied as an anti-corrosion layer. Thixotropic water-blocking gel should also be filled between the metal armor layers. When the sheath experiences point or localized damage, the invading moisture can quickly activate the gel's expansion and water-blocking effect, greatly limiting the longitudinal migration distance of the moisture. Furthermore, considering the cable's structural integrity and good flame-retardant performance, a layer of halogen-free, low-smoke, highly flame-retardant fiberglass cloth tape should be wrapped around the anti-corrosion layer.

[0025] Specifically, such as Figure 1 As shown, the cable also includes an outer sheath 7, which is fitted onto the second waterproof layer. The outer sheath improves the cable's mechanical and protective properties.

[0026] Specifically, the outer sheath is made of flame-retardant polyethylene sheath material that is resistant to cold temperatures down to -40℃, salt spray, ultraviolet rays, and mold. To better ensure the cable's resistance to seawater corrosion, this product also has a 0.5mm~1mm layer of 8525BG waterproof coating sprayed on the outer sheath.

[0027] Specifically, such as Figure 1As shown, the first waterproof layer includes: a first sheath 201 and a waterproof longitudinal wrapping 202, the waterproof longitudinal wrapping 202 being fitted onto the first sheath 201; the second waterproof layer includes: a second P sheath. Both the first sheath 201 and the second sheath 201 are made of fiberglass-reinforced PP sheaths, and the waterproof longitudinal wrapping 202 is made of double-sided aluminum-plastic composite tape. The fiberglass-reinforced PP sheath acts as a structural barrier; its high strength, high rigidity, and excellent wear resistance effectively resist external mechanical stress and wear, maintaining the stability of the cable structure dimensions, preventing physical damage, and providing basic moisture protection. The double-sided aluminum-plastic composite tape forms a continuous sealed tube through a longitudinal wrapping heat-sealing process, its dense aluminum layer completely blocking water vapor and gas penetration, fundamentally preventing longitudinal water ingress.

[0028] Specifically, such as Figure 1 As shown, the first humidity monitoring unit and the conductor's single filament form a twisted structure. Twisting the first humidity monitoring unit with the conductor's single filament avoids the problem of an uneven cable cross-section caused by setting up the first humidity monitoring unit alone, thus optimizing the internal structure of the cable.

[0029] Specifically, such as Figure 1 As shown, the second humidity monitoring unit is arranged side-by-side with the metal wires of the armor layer and wound around the outside of the isolation sleeve. By arranging the second humidity monitoring unit and the metal wires of the armor layer side-by-side around the outside of the isolation sleeve, the problem of an uneven cable cross-section caused by a separate second humidity monitoring unit is avoided, thus optimizing the internal structure of the cable.

[0030] Specifically, the humidity monitoring structure in this embodiment mainly functions as follows: ① The first humidity monitoring unit is regarded as a conductor filament, which is twisted together with other wire cores to monitor whether the core conductor of the cable is damp; ② The second humidity monitoring unit is regarded as an armor metal wire, which is wound together with other metal wires outside the isolation sleeve to monitor whether moisture has penetrated into the armor layer after the outer sheath is damaged, so as to realize the humidity monitoring of the key internal structure of the cable.

[0031] Specifically, the humidity monitoring structure is existing technology, and there are two specific implementation methods in this embodiment, which will be described below.

[0032] (1) Implementation method 1 (D-type optical fiber + nanoporous polyimide film) The humidity monitoring unit in this embodiment mainly consists of a nanoporous polyimide film and a single-mode optical fiber. The nanoporous polyimide film is a humidity-sensitive material with high sensitivity to moisture, fast response speed, good stability, and resistance to high and low temperatures. The single-mode optical fiber mainly serves as an optical signal transmission medium. When the cladding of a portion of the fiber is removed, a D-type (side-displaced) optical fiber is formed. At this time, the evanescent field of its exposed core is extremely sensitive to changes in the external refractive index.

[0033] In practice, a section of the optical fiber is first polished using a wheel polishing method to remove all or only a small amount of the cladding. Then, a nanoporous polyimide film, with a thickness in the micrometer range, is uniformly coated onto the polished area of ​​the D-type optical fiber using spin coating or dip-coating methods, forming a micro-sensor for optical fiber humidity. When the humidity at a specific monitoring point (conductor or armor layer) inside the cable increases, water molecules are adsorbed by the nanoporous polyimide film, causing them to expand and change their refractive index. This further alters the refractive index of the evanescent field of the D-type optical fiber relative to the external environment, thereby modulating the phase of the transmitted optical signal (Rayleigh scattered light and backscattered light) in the fiber. This implementation method is often used for humidity monitoring in critical sections of cables.

[0034] First, the optical frequency domain reflectometer (OFDR) demodulation unit emits a specific frequency laser into the optical fiber integrated inside the cable to excite the signal. During transmission, the laser passes through a D-shaped fiber section coated with a humidity-sensitive material, modulating the refractive index of the evanescent field of the fiber core relative to the outside when the humidity remains unchanged. When the humidity inside the cable changes, the humidity-sensitive film absorbs moisture and expands, changing its refractive index. This causes a change in the refractive index of the evanescent field of the D-shaped fiber relative to the outside, resulting in a specific shift in the phase or spectrum of the corresponding Rayleigh scattered light. Subsequently, the backscattered Rayleigh light carrying this humidity information returns along the optical fiber and is received by the OFDR unit. Finally, the unit converts the optical signal into a spatial distribution function, accurately calculates the humidity value at the D-shaped fiber through model transformation, and locates the abnormal humidity point based on the time-domain reflectometry principle.

[0035] (2) Humidity monitoring implementation method 2 (all-fiber optic cable itself + nanoporous polyimide film) This embodiment uses spin coating or dip-coating to coat a micron-sized porous polyimide film, a humidity-sensitive material, onto the entire optical fiber to form a humidity sensor, enabling continuous humidity measurement along the entire cable. The working principle is as follows: water molecules invade the fiber, the humidity-sensitive film absorbs the water molecules and expands, applying mechanical stress to the optical fiber. The refractive index and length of the fiber change due to this stress, resulting in changes in Rayleigh scattering and backscattering, thus achieving humidity monitoring.

[0036] First, the OFDR host emits a specific wavelength laser into the optical fiber inside the cable to excite the signal. The laser propagates in the optical fiber, modulating the optical signal when the humidity has not changed. When water molecules invade or the humidity inside the cable changes, the humidity-sensitive membrane absorbs the water molecules and expands, generating mechanical stress that acts on the optical fiber, causing a change in the refractive index of the optical fiber and a corresponding phase change in Rayleigh scattering. Subsequently, the backscattered light signal carrying this humidity information returns to the OFDR host. The host demodulates the phase distribution of the entire optical fiber and calculates the absolute humidity value at every point along the length of the optical fiber based on a pre-calibrated mathematical model, achieving continuous and precisely located humidity monitoring along the entire line.

[0037] The features of this type of marine new energy power generation land-sea connection cable are as follows: the first humidity monitoring unit monitors humidity at the core, and the second humidity monitoring unit monitors humidity between the waterproof layers, thus forming a composite monitoring structure. This enables early warning of water leakage problems. At the same time, the isolation sleeve enhances the mechanical strength and flame retardancy of the cable. Together with the waterproof layer, they form a multi-protection structure, which significantly improves the reliability, safety and service life of the cable in harsh marine environments.

[0038] The features of this type of marine new energy power generation land-sea connection cable are as follows: the first humidity monitoring unit monitors humidity at the core, and the second humidity monitoring unit monitors humidity between the waterproof layers, thus forming a composite monitoring structure. This enables early warning of water leakage problems. At the same time, the isolation sleeve enhances the mechanical strength and flame retardancy of the cable. Together with the waterproof layer, they form a multi-protection structure, which significantly improves the reliability, safety and service life of the cable in harsh marine environments.

[0039] The above are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent.

Claims

1. A land-sea connection cable for marine new energy power generation, characterized in that, include: The wire core includes: a conductor, a first humidity monitoring unit, and an insulating layer, wherein the insulating layer encloses the conductor and the first humidity monitoring unit inside the wire core. The first waterproof layer is fitted over the outside of the wire core; An isolation sleeve, fitted over the outside of the first waterproof layer, is used to improve the mechanical and flame-retardant properties of the cable. The second humidity monitoring unit is fitted onto the outside of the isolation sleeve; The second waterproof layer is fitted onto the outside of the second humidity monitoring unit.

2. The marine-electric power generation onshore-offshore connection cable according to claim 1, characterized in that, The cable core consists of multiple wires forming a cable core. The cable core further includes a filler and a wrapping tape. The wrapping tape is wrapped around the outside of the cable core, and the filler is disposed between the wrapping tape and the wire core.

3. The marine-electric power generation onshore-offshore connection cable according to claim 1, characterized in that, The first waterproof layer includes: a first sheath and a waterproof longitudinal sleeve, wherein the waterproof longitudinal sleeve is fitted onto the first sheath; the second waterproof layer includes: a second P sheath.

4. The marine-electric power generation onshore-offshore connection cable according to claim 1, characterized in that, The first humidity monitoring unit and the single filament of the conductor form a twisted structure.

5. The marine-electric power generation onshore-offshore connection cable according to claim 1, characterized in that, Also includes: An armor layer, which is fitted onto the isolation sleeve.

6. The marine new energy power generation onshore-offshore connection cable according to claim 5, characterized in that, The second humidity monitoring unit is arranged side by side with the metal wire of the armor layer and wrapped around the outside of the isolation sleeve.

7. The marine new energy power generation onshore-offshore connection cable according to claim 4, characterized in that, Also includes: An outer sheath, which is fitted onto the second waterproof layer.

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