220kV distributed high-voltage submarine cable and manufacturing method thereof

Abstract

The invention discloses a 220kV distributed high-voltage submarine cable and a manufacturing method thereof, and the submarine cable comprises a cable core, a belting layer, a lining layer, an armor layer and an outer protection layer which are sequentially arranged from inside to outside. The cable core comprises a first optical fiber unit arranged in the center and a plurality of insulating wire cores which are uniformly arranged around the first optical fiber unit in the circumferential direction and are tangent to the wrapping tape layer, a second optical fiber unit is arranged between the adjacent insulating wire cores in a tangent mode, and a filling unit is arranged between the second optical fiber unit and the wrapping tape layer; at least four third optical fiber units are evenly embedded in the armor layer in the circumferential direction, and a 5G communication optical fiber, a temperature monitoring optical fiber and a micro-motion monitoring optical fiber are arranged in the first optical fiber unit, the second optical fiber unit and the third optical fiber units respectively. According to the invention, 5G communication and temperature and micro-motion monitoring can be realized, a multifunctional submarine cable is realized, the layout of each optical fiber unit is reasonable, the monitoring precision is improved, and better protection is realized, so that the normal use of the submarine cable is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of submarine cables, and in particular to a 220kV distributed high-voltage submarine cable and a manufacturing method thereof. Background Art

[0002] With the development and utilization of marine resources, the demand for submarine cables is growing. Traditional submarine cables are relatively simple in function and cannot meet the requirements of modern marine engineering for intelligent and multifunctional cables. At present, although some submarine cables have certain monitoring functions, the optical fiber units are often concentrated in the cable core. When the cable core is cabled, a certain space is reserved for placing the optical fiber units. After the cable is cabled, the optical fiber is unevenly distributed, which affects the accuracy of monitoring. At the same time, during production, construction and actual use, the optical fiber is easily broken by external forces, thus affecting the normal use of the entire submarine cable. Summary of the invention

[0003] The purpose of the present invention is to propose a 220kV distributed high-voltage submarine cable and a manufacturing method thereof in view of the shortcomings of the prior art, which can combine 5G communication and temperature and micro-motion monitoring to realize a multifunctional submarine cable, and each optical fiber unit is reasonably laid out, which improves the monitoring accuracy while being better protected, thereby ensuring the normal use of the submarine cable.

[0004] The technical solution to achieve the purpose of the present invention is:

[0005] A 220kV distributed high-voltage submarine cable, comprising a cable core, a tape layer, an inner lining layer, an armor layer and an outer sheath arranged in sequence from the inside to the outside, the cable core comprising a first optical fiber unit arranged in the center and a plurality of insulating wire cores uniformly arranged circumferentially around the first optical fiber unit and all tangentially arranged to the tape layer, a second optical fiber unit is tangentially arranged between adjacent insulating wire cores and a filling unit is arranged between the tape layer, at least four third optical fiber units are uniformly embedded in the armor layer along the circumferential direction, and a 5G communication optical fiber, a temperature monitoring optical fiber and a micro-motion monitoring optical fiber are respectively arranged in the first optical fiber unit, the second optical fiber unit and the third optical fiber unit.

[0006] Furthermore, three insulating cores are provided and are arranged tangent to each other in pairs, so as to form a gap with a triangular structure in the center, and the first optical fiber unit is arranged in the gap and the outer peripheral surface is arranged tangent to the three insulating cores.

[0007] Furthermore, the armor layer includes multiple groups of armor segments evenly distributed along the circumferential direction, the armor segments are composed of multiple galvanized steel wires that are closely arranged along the circumferential direction and coated with asphalt on the surface, and the third optical fiber unit is closely arranged between adjacent armor segments and has an outer diameter that is the same as the outer diameter of the galvanized steel wire.

[0008] Furthermore, the number of the third optical fiber units is six.

[0009] Furthermore, the wavelengths of the 5G communication optical fiber and the temperature monitoring optical fiber are 1550±20nm, the wavelength of the micro-motion monitoring optical fiber is 1625±10nm, and the dynamic range at 20ms is 41dB.

[0010] Furthermore, the insulated wire core includes a water-blocking conductor, a conductor shield, a cross-linked polyethylene insulation, an insulating shield, a semiconductive water-blocking tape, a lead sheath and a semiconductive PE sheath arranged in sequence from the inside to the outside, the water-blocking conductor includes a first copper conductor with a circular cross-section and a multi-layer conductor layer arranged around the first copper conductor, the conductor layer is wrapped with a water-blocking tape, including a plurality of second copper conductors arranged closely along the circumferential direction and with a fan-shaped ring structure in cross-section, and a water-blocking rope is twisted into the gap between adjacent second copper conductors.

[0011] Furthermore, the filling unit is a filling strip of an integral structure, the filling strip is a fan-shaped structure and a circular arc-shaped notch is provided at the tip, and the second optical fiber unit is clamped in the circular arc-shaped notch.

[0012] Furthermore, the inner lining layer and the outer sheath layer are both formed by wrapping PP ropes, the inner lining layer is a single-layer structure, and the outer sheath layer is a double-layer structure.

[0013] Furthermore, the outer layer of the outer protective layer is provided with a warning color tape.

[0014] A method for manufacturing the 220kV distributed high-voltage submarine cable as described above comprises the following steps:

[0015] Step S1: drawing a copper rod with high conductivity according to a designed profile mold, continuously drawing and withdrawing it, and simultaneously twisting it with a water-blocking rope according to design requirements, and wrapping a water-blocking tape between adjacent conductor layers to form a water-blocking conductor;

[0016] Step S2: outside the water-blocking conductor, a three-layer co-extrusion is used to form a conductor shielding layer, a cross-linked polyethylene insulation and an insulation shield at one time, and the prepared wire core is placed in a drying room at 70±5°C for 20-30 days for degassing treatment, and then wrapped with two layers of semi-conductive water-blocking tape. During the wrapping, a polyester ribbon is directly dragged, and a lead sheath and a semi-conductive PE sheath are extruded to form an insulated wire core with a specific color;

[0017] Step S3: With the first optical fiber unit as the center, insulating cores of different colors and filling units with the same number as the insulating cores and pre-installed with the second optical fiber unit are selected to form a cable together, and wrapped with a wrapping tape to form a cable core;

[0018] Step S4: Wrap the cable core with a tape and a PP rope lining layer in turn, then armor it with a galvanized steel wire coated with asphalt, add a third optical fiber unit during armoring to form an armor layer with optical fiber embedded in it, and finally wrap two layers of PP rope, and add a warning ribbon when wrapping the outer layer to wrap them together to form an outer sheath.

[0019] By adopting the above technical solution, the present invention has the following beneficial effects:

[0020] (1) The present invention is provided with three types of optical fiber units, which are used for 5G communication, temperature monitoring and temperature monitoring respectively. Compared with traditional submarine cables, the present invention has more functions and the distribution of optical fiber units is cleverly designed; the first optical fiber unit arranged in the center is protected by an insulating core, and a filling unit is provided to protect the second optical fiber unit; the second optical fiber unit is arranged tangent to the insulating cores on both sides, which can not only limit the position of the second optical fiber unit and improve the stability of the structure, but also more accurately monitor the temperature of the insulating core due to direct contact; the third optical fiber unit is embedded in the armor layer and is also effectively protected, and is arranged close to the outer layer area as a micro-motion monitoring, which has a better effect and realizes a multifunctional submarine cable. Each optical fiber unit is triggered by function and reasonably arranged, which improves the monitoring accuracy and is better protected, thereby ensuring the normal use of the submarine cable.

[0021] (2) The submarine cable of the present invention adopts three insulating cores, and the first optical fiber unit is designed to be tangent to the three insulating cores, so as to achieve position fixation, make the overall structure more stable, and provide all-round protection for the first optical fiber unit.

[0022] (3) The present invention uses galvanized steel wire for armoring and asphalt coating, which effectively prevents seawater corrosion and prolongs the service life. At the same time, the outer diameter of the third optical fiber unit is the same as the galvanized steel wire, which not only facilitates the preparation of the armor layer, but also protects the third optical fiber unit through the galvanized steel wire on the left and right sides.

[0023] (4) The third optical fiber unit of the present invention is provided with six pieces, so as to better monitor the micro-movement of the submarine cable and improve the monitoring accuracy.

[0024] (5) Each optical fiber unit of the present invention adopts an optical fiber of a special wavelength, has a long monitoring distance, and can monitor temperature changes, small movements and vibrations, thereby realizing real-time monitoring of temperature changes and small movements and vibrations of various parts of the cable, thereby improving monitoring accuracy.

[0025] (6) The insulated wire core of the present invention adopts cross-linked polyethylene insulation material, which has high insulation performance and anti-water tree performance, and adopts a semi-conductive water-blocking tape and a lead sheath, that is, a combination structure of metal shielding and non-metallic shielding, to reduce electromagnetic interference; at the same time, the water-blocking conductor adopts a copper conductor material with high conductivity to ensure that its quality meets the requirements of high-voltage transmission, and adopts a special wire structure to ensure that the conductor structure is tight, the conductivity is good, and the surface is smooth, thereby ensuring uniform distribution of the electromagnetic field, and additionally provided with a water-blocking tape and a water-blocking rope to achieve excellent water-blocking performance and better adapt to the submarine use environment.

[0026] (7) The present invention adopts an integral structural filling strip with an arc-shaped notch as a filling unit, so that the second optical fiber unit is pre-installed in the filling unit, which facilitates cable preparation and further improves the protection of the optical fiber unit.

[0027] (8) The present invention improves the visibility of the cable in the sea by providing a warning color band so that underwater workers or fishermen can easily identify and avoid causing damage to the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings, wherein:

[0029] Figure 1 It is a schematic diagram of the structure of the present invention.

[0030] The reference numerals in the accompanying drawings are:

[0031] Cable core 1, first optical fiber unit 1-1, insulated core 1-2, water-blocking conductor 1-2-1, conductor shield 1-2-2, cross-linked polyethylene insulation 1-2-3, insulation shield 1-2-4, semi-conductive water-blocking tape 1-2-5, lead sheath 1-2-6, semi-conductive PE sheath 1-2-7, second optical fiber unit 1-3, filling unit 1-4, tape layer 2, lining layer 3, armor layer 4, outer sheath 5, third optical fiber unit 6. DETAILED DESCRIPTION

[0032] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] (Example 1)

[0034] like Figure 1The 220kV distributed high-voltage submarine cable shown comprises a cable core 1, a tape layer 2, an inner lining layer 3, an armor layer 4 and an outer sheath 5 arranged in sequence from the inside to the outside. The cable core 1 comprises a first optical fiber unit 1-1 arranged in the center and a plurality of insulating cores 1-2 uniformly arranged circumferentially around the first optical fiber unit 1-1 and all tangent to the tape layer 2. A second optical fiber unit 1-3 is tangentially arranged between adjacent insulating cores 1-2, and a filling unit 1-4 is arranged between the tape layer 2. At least four third optical fiber units 6 are uniformly embedded in the armor layer 4 along the circumferential direction. The first optical fiber unit 1-1, the second optical fiber unit 1-3 and the third optical fiber unit 6 are respectively provided with 5G communication optical fiber, temperature monitoring optical fiber and micro-motion monitoring optical fiber, which are used for 5G communication, temperature monitoring and temperature monitoring respectively. Compared with traditional submarine cables, it has richer functions. Through the ingenious design of the distribution of the optical fiber units, the insulating core 1-2 is used to protect the first optical fiber unit 1-1 located in the center, and the filling unit 1-4 is provided to protect the second optical fiber unit 1-3; the second optical fiber unit 1-3 is arranged tangent to the insulating cores 1-2 on both sides, which can not only limit the position of the second optical fiber unit 1-3 and improve the stability of the structure, but also more accurately monitor the temperature of the insulating core 1-1 due to direct contact; the third optical fiber unit 6 is embedded in the armor layer 4 and is also effectively protected, and is arranged near the outer layer area as a micro-motion monitoring, which has a better effect and realizes a multifunctional submarine cable. Each optical fiber unit is triggered by function and reasonably arranged to improve the monitoring accuracy while being better protected, thereby ensuring the normal use of the submarine cable.

[0035] Specifically, in this embodiment, three insulating cores 1-2 are provided and are arranged tangent to each other in pairs, thereby forming a gap with a triangular structure in the center. The first optical fiber unit 1-1 is arranged in the gap and the outer peripheral surface is arranged tangent to the three insulating cores 1-2, thereby achieving fixed position, making the overall structure more stable, and realizing all-round protection of the first optical fiber unit.

[0036] The insulated wire core 1-2 includes a water-blocking conductor 1-2-1, a conductor shield 1-2-2, a cross-linked polyethylene insulation 1-2-3, an insulation shield 1-2-4, a semiconductive water-blocking tape 1-2-5, a lead sheath 1-2-6 and a semiconductive PE sheath 1-2-7, which are arranged from the inside to the outside. The cross-linked polyethylene insulation material is used, which has high insulation performance and anti-water tree performance, and the semiconductive water-blocking tape and the lead sheath are used, that is, a combination structure of metal shielding and non-metal shielding to reduce electromagnetic interference. The water-blocking conductor 1-2-1 includes a first copper conductor with a circular cross-section structure and a multi-layer conductor layer arranged around the first copper conductor. The conductor layer is wrapped with a water-blocking tape, including a plurality of second copper conductors arranged closely along the circumference and having a fan-shaped ring structure in cross section. The gaps between adjacent second copper conductors are twisted with water-blocking ropes. By using a special wire structure for twisting, the conductor structure is ensured to be compact, the conductivity is good, and the surface is smooth, thereby ensuring uniform distribution of the electromagnetic field. Water-blocking tapes and water-blocking ropes are added to achieve excellent water-blocking performance and better adapt to the submarine use environment.

[0037] The semi-conductive water-resistant tape 1-2-5 is wrapped in two layers to achieve uniform electric field and water-blocking effect, and a 10mm wide polyester ribbon is directly dragged between the two layers. The colors of the polyester ribbons in the three insulated cores 1-2 are different, corresponding to the A phase, B phase and C phase of electricity, which is easy to distinguish.

[0038] The filling unit 1-4 is a filling strip of an integral structure. The filling strip is a fan-shaped structure and has an arc-shaped recess at the tip. The second optical fiber unit 1-3 is clamped in the arc-shaped recess, so that the second optical fiber unit 1-3 is pre-installed in the filling unit, which facilitates cable preparation and further improves the protection of the optical fiber unit.

[0039] In order to better monitor the micro-movement of the submarine cable, six third optical fiber units 6 are provided in this embodiment. The armor layer 4 includes six groups of armor segments evenly distributed along the circumference, and the armor segments are composed of a plurality of galvanized steel wires closely arranged along the circumference and coated with asphalt on the surface. The third optical fiber unit 6 is closely arranged between adjacent armor segments and has the same outer diameter as the outer diameter of the galvanized steel wire.

[0040] The first optical fiber unit 1-2, the second optical fiber unit 1-3 and the third optical fiber unit 6 are all designed with a pressure-resistant and waterproof structure, including a high-density polyethylene sheath, a stainless steel metal reinforcement layer and a water-blocking tape layer arranged from the outside to the inside, and the 5G communication optical fiber, the temperature monitoring optical fiber and the micro-motion monitoring optical fiber are respectively arranged in the corresponding water-blocking tape layer, wherein the stainless steel metal layer is composed of hollow circular tubes arranged closely along the circumference, thereby ensuring the waterproof and pressure-resistant performance of the optical fiber unit. The wavelengths of the 5G communication optical fiber and the temperature monitoring optical fiber are both 1550±20nm, and the wavelength of the micro-motion monitoring optical fiber is 1625±10nm, with a dynamic range of 41dB at 20ms, a long monitoring distance, and the ability to monitor temperature changes, micro-movements and vibrations, respectively, to achieve real-time monitoring of temperature changes and micro-movements and vibrations in various parts of the cable. The temperature monitoring optical fiber has a long transmission distance and the signal transmission is not distorted. It uses sensitive optical time domain reflection to inject a light pulse with a wavelength of 1550±20nm from one end of the optical fiber, detect the intensity and pulse phase change of the scattered light from the other end, monitor the temperature change and position of the three phases ABC of the submarine cable, and play an online alarm role. Through six micro-motion monitoring optical fibers, it is used to monitor micro-motions in 6 different directions. A light pulse with a wavelength of 1625±10nm is injected from one end of the optical fiber, and the intensity and pulse phase change of the scattered light are detected from the other end. The micro-motion changes and positions of the submarine cable in 6 different directions are monitored, and the online alarm function is played.

[0041] The inner lining layer 3 and the outer sheath 4 are both wrapped with PP rope. The inner lining layer is a single-layer structure, and the outer sheath is a double-layer structure. The outer layer of the outer sheath is provided with a warning color band to improve the visibility of the cable in the sea so that underwater workers or fishermen can easily identify and avoid damage to the cable.

[0042] The manufacturing method of the 220kV distributed high-voltage submarine cable of this embodiment comprises the following steps:

[0043] Step S1: drawing a copper rod with high conductivity according to a designed profile mold, continuously drawing and withdrawing it, and simultaneously twisting it with a water-blocking rope according to design requirements, and wrapping a water-blocking tape between adjacent conductor layers to form a water-blocking conductor 1-2-1;

[0044] Step S2: outside the water-blocking conductor, three-layer co-extrusion is used to form the conductor shielding layer 1-2-2, the cross-linked polyethylene insulation 1-2-3 and the insulation shielding 1-2-4 at one time, and the prepared wire core is placed in a drying room at 70±5°C for 20-30 days for degassing treatment, and then wrapped with two layers of semi-conductive water-blocking tape 1-2-5. During the wrapping, a polyester ribbon is directly dragged to extrude the lead sheath 1-2-6 and the semi-conductive PE sheath 1-2-7 to make an insulated wire core 1-2 with a specific color;

[0045] Step S3: With the first optical fiber unit 1-1 as the center, select insulating cores 1-2 with different colors and filling units 1-4 with the same number as the insulating cores and pre-installed with second optical fiber units 1-3 to form a cable together, and wrap them with a wrapping tape to form a cable core 1;

[0046] Step S4: Wrap the cable core 1 with a wrapping tape and a PP rope lining layer in sequence, then armor it with a galvanized steel wire coated with asphalt, add the third optical fiber unit 6 during armoring to form an armor layer with optical fiber embedded in it, and finally wrap two layers of PP rope, and add a warning ribbon when wrapping the outer layer to wrap them together to form an outer sheath.

[0047] The micro-motion monitoring scenario of this embodiment:

[0048] Ship navigation scenario: Sailing from a to d is one direction. The ship sails from optical fiber a → optical fiber d. Optical fiber a first senses micro-motion, and the intensity of scattered light and pulse phase change, which can measure the position and micro-motion of a. Then optical fiber b senses micro-motion, and the intensity of scattered light and pulse phase change, which can measure the position and micro-motion of b. Then optical fiber c senses micro-motion, and the intensity of scattered light and pulse phase change, which can measure the position and micro-motion of c. Finally, optical fiber d senses micro-motion, and the intensity of scattered light and pulse phase change, which can measure the position and micro-motion of d. According to the position and micro-motion intensity, it is judged that the ship is from a to d.

[0049] Scenario of anchor hooking up the submarine cable: From f to b, it is one direction. The anchor hooks up the submarine cable from the direction of fiber f → fiber b. Fiber f first senses the micro-motion, and the intensity and pulse phase of the scattered light change, which can measure the position and micro-motion of fiber f. Then fiber a senses the micro-motion, and the intensity and pulse phase of the scattered light change, which can measure the position and micro-motion of fiber a. Finally, fiber b senses the micro-motion, and the intensity and pulse phase of the scattered light change, which can measure the position and micro-motion of fiber b. According to the position and micro-motion intensity, it is judged that the anchor hooked up the submarine cable from fiber f to fiber b.

[0050] The submarine cable is exposed and floating on the seabed: it is a multi-directional scene. It may be that when sailing from fiber a → fiber d, fiber a first senses micro-motion, and the intensity and pulse phase of the scattered light change, and the position and micro-motion of a can be measured. Then fiber b senses micro-motion, and the intensity and pulse phase of the scattered light change, and the position and micro-motion of b can be measured. Then fiber c senses micro-motion, and the intensity and pulse phase of the scattered light change, and the position and micro-motion of c can be measured. Finally, fiber d senses micro-motion, and the intensity and pulse phase of the scattered light change, and the position and micro-motion of d can be measured. According to the position and micro-motion intensity, it can be judged that the ship is from a to d. It may also be from f to b, which is one direction. The submarine cable is hooked from fiber f → fiber b. Fiber f first senses micro-motion, and the intensity and pulse phase of the scattered light change, and the position and micro-motion of f can be measured. Then fiber a senses micro-motion, and the intensity and pulse phase of the scattered light change, and the position and micro-motion of a can be measured. Finally, fiber b senses micro-motion, and the intensity and pulse phase of the scattered light change, and the position and micro-motion of b can be measured. According to the position and micro-motion intensity, the direction from fiber f to fiber b can be determined. The submarine cable is floating on the seabed, which is a non-stop cyclic movement, so it can be determined that the submarine cable is floating on the seabed.

[0051] The present invention has a built-in first optical fiber unit with a special wavelength in the center area of ​​the submarine cable, with a wavelength of 1550±20nm, which is used for 5G communication. In the adjacent areas of the A-phase, B-phase and C-phase cores of the submarine cable filling unit, three second optical fiber units with special wavelengths are built-in, with a wavelength of 1550±20nm, which are used to monitor temperature. Between the armor layers, 6 built-in special wavelength optical fiber units are evenly distributed, with a wavelength of 1625±10nm, which are used to monitor micro-movements in 6 different directions. All optical fiber units are waterproofed by wrapping water-blocking tape and have a pressure-resistant packaging structure of stainless steel tubes to ensure their stable operation in the submarine environment. Optical fibers with special wavelengths can monitor temperature and micro-movements, and respectively realize real-time monitoring of temperature changes, small movements and vibrations in various parts of the cable. The whole system has efficient communication capability, precise monitoring function, good electrical insulation, seawater corrosion resistance and mechanical strength. It is suitable for complex submarine environments and provides strong guarantee for the safe operation of marine projects. Through the special micro-motion monitoring optical fiber design, it can quickly identify the damage of submarine cables by ship anchors during the cable laying and use process. At the same time, it can monitor the movement of ocean currents to expose the submarine cable and float on the seabed. It is also suitable for monitoring hidden ships passing through submarine cables.

[0052] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A 220kV distributed high-voltage submarine cable, characterized in that: The cable core comprises a cable core, a tape layer, an inner lining layer, an armor layer and an outer sheath arranged in sequence from the inside to the outside, the cable core comprises a first optical fiber unit arranged in the center and a plurality of insulating cores uniformly arranged circumferentially around the first optical fiber unit and all tangent to the tape layer, a second optical fiber unit is tangently arranged between adjacent insulating cores and a filling unit is arranged between the tape layer, at least four third optical fiber units are uniformly embedded in the armor layer along the circumferential direction, and a 5G communication optical fiber, a temperature monitoring optical fiber and a micro-motion monitoring optical fiber are respectively arranged in the first optical fiber unit, the second optical fiber unit and the third optical fiber unit.

2. A 220 kV distributed high voltage submarine cable according to claim 1, characterized in that: The insulating cores are provided with three and are arranged tangent to each other in pairs, so as to form a gap with a triangular structure in the center. The first optical fiber unit is arranged in the gap and its outer peripheral surface is arranged tangent to the three insulating cores.

3. A 220 kV distributed high voltage submarine cable according to claim 1, characterized in that: The armor layer includes multiple groups of armor segments evenly distributed along the circumferential direction, and the armor segments are composed of multiple galvanized steel wires that are closely arranged along the circumferential direction and coated with asphalt on the surface. The third optical fiber unit is closely arranged between adjacent armor segments and has an outer diameter that is the same as the outer diameter of the galvanized steel wire.

4. A 220 kV distributed high voltage submarine cable according to claim 1, characterized in that: There are six third optical fiber units.

5. A 220 kV distributed high voltage submarine cable according to claim 1, characterized in that: The wavelengths of the 5G communication optical fiber and the temperature monitoring optical fiber are 1550±20nm, the wavelength of the micro-motion monitoring optical fiber is 1625±10nm, and the dynamic range at 20ms is 41dB.

6. A 220 kV distributed high voltage submarine cable according to claim 1, characterized in that: The insulated wire core includes a water-blocking conductor, a conductor shield, a cross-linked polyethylene insulation, an insulation shield, a semiconductive water-blocking tape, a lead sheath and a semiconductive PE sheath which are arranged in sequence from the inside to the outside. The water-blocking conductor includes a first copper conductor with a circular cross-section and a multi-layer conductor layer arranged around the first copper conductor. The conductor layer is wrapped with a water-blocking tape, including a plurality of second copper conductors which are closely arranged in the circumferential direction and have a fan-shaped cross-section. A water-blocking rope is twisted into the gap between the adjacent second copper conductors.

7. A 220 kV distributed high voltage submarine cable according to claim 1, characterized in that: The filling unit is a filling strip of an integral structure. The filling strip is a fan-shaped structure and a circular arc notch is arranged at the tip. The second optical fiber unit is clamped in the circular arc notch.

8. A 220 kV distributed high voltage submarine cable according to claim 1, characterized in that: The inner lining layer and the outer sheath layer are both formed by wrapping PP ropes, the inner lining layer is a single-layer structure, and the outer sheath layer is a double-layer structure.

9. A 220 kV distributed high voltage submarine cable according to claim 8, characterized in that: The outer layer of the outer protective layer is provided with a warning color tape.

10. A method for manufacturing a 220 kV distributed high voltage submarine cable according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step S1: drawing a copper rod with high conductivity according to a designed profile mold, continuously drawing and withdrawing it, and simultaneously twisting it with a water-blocking rope according to design requirements, and wrapping a water-blocking tape between adjacent conductor layers to form a water-blocking conductor; Step S2: outside the water-blocking conductor, a three-layer co-extrusion is used to form a conductor shielding layer, a cross-linked polyethylene insulation and an insulation shield at one time, and the prepared wire core is placed in a drying room at 70±5°C for 20-30 days for degassing treatment, and then wrapped with two layers of semi-conductive water-blocking tape. During the wrapping, a polyester ribbon is directly dragged, and a lead sheath and a semi-conductive PE sheath are extruded to form an insulated wire core with a specific color; Step S3: With the first optical fiber unit as the center, insulating cores of different colors and filling units with the same number as the insulating cores and pre-installed with the second optical fiber unit are selected to form a cable together, and wrapped with a wrapping tape to form a cable core; Step S4: Wrap the cable core with a tape and a PP rope lining layer in turn, then armor it with a galvanized steel wire coated with asphalt, add a third optical fiber unit during armoring to form an armor layer with optical fiber embedded in it, and finally wrap two layers of PP rope, and add a warning ribbon when wrapping the outer layer to wrap them together to form an outer sheath.

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