CN110690003A - 66kV wind power high-voltage torsion cable and production process thereof - Google Patents

Abstract

The invention discloses a 66kV wind power high-voltage torsion cable and a production process thereof. The cable comprises: a saddle-shaped support filling layer; three arc-shaped gaps are arranged in the center of the cable, and the surface is coated with graphite powder; three main wire cores; In the three arc-shaped gaps of the layer, the surface is coated with graphite powder; three grounded cells are respectively arranged between the two main cores and supported by the filling layer, and the surface is coated with graphite powder; semi-conductive inner protection The layer, the fiber braided layer and the outer sheath are sequentially arranged outside the three main cores. The filling layer of the present invention has an arc-shaped notch, which is interlocked with the shape of the main electric core, which not only enhances the tensile and torsional resistance of the cable, but also has a compact structure, small installation space, and large twisting pitch.

Description

66kV wind power high-voltage torsion cable and its production process

technical field

The invention relates to a cable, in particular to a 66kV wind power high-voltage torsion cable and a production process thereof.

Background technique

At present, the world is keen on sustainable renewable energy, among which wind power plays a pivotal role. The driving force for the development of wind power technology in the future will mainly come from the booming construction of offshore wind farms, and this development trend is irreversible. Offshore wind turbines will gradually develop to large-scale units of more than 10MW, and the support foundation will change from fixed to floating. The scale of offshore wind farms will also continue to develop to large-scale. With the continuous growth of offshore wind power unit capacity, 33kV as the voltage level of the submarine cable in the field has gradually become a bottleneck restricting the design of the submarine cable system. Therefore, some European offshore wind farms are the first to try to increase the voltage level of the submarine cables in the field. The British Blyth Offshore Demonstration Wind Farm under construction is the first offshore wind farm in the world to use 66kV as the voltage level of the submarine cable in the field. Many projects under planning or winning bids will also adopt the 66kV voltage level scheme. According to the forecast of the Danish Wind Energy Consulting Agency, the European market will fully switch to the 66kV voltage level from 2019. However, our domestic high-voltage rubber sheathed cables have large outer diameters and heavy weights, which cannot meet the requirements of high-voltage wind power torsion cables.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the problem that the performance of the existing cables cannot be satisfied, and to provide a 66kV torsion-resistant flexible wind power cable with strong torsion resistance, excellent electrical performance, small outer diameter and light weight, and a production process thereof.

The technical solution for realizing the purpose of the present invention is a 66kV wind power high-voltage torsion cable, which includes: a saddle-shaped support filling layer; three arc-shaped gaps are arranged in the center of the cable, and the surface is coated with graphite powder; three main cores are arranged on the filling layer. In the three arc-shaped gaps, the surface is coated with graphite powder; three grounded battery cores are respectively arranged between the two main cores and supported by the filling layer, and the surface is coated with graphite powder; semiconductive inner protective layer , a fiber braided layer and an outer sheath, which are arranged outside the three main cores in sequence. The filling layer of the present invention has an arc-shaped notch, which is interlocked with the shape of the main electric core, which not only enhances the tensile and torsional resistance of the cable, but also has a compact structure, small outer diameter and low weight of the cable.

Further, the main wire core is the main wire core conductor, the conductive nylon tape, the semiconductive inner shielding layer, the insulating layer and the peelable semiconducting outer shielding layer in sequence from the inside to the outside;

The insulating layer adopts HEPR ultra-clean ethylene-propylene rubber. The ethylene-propylene rubber insulating layer of the invention has high volume resistivity, reduces the thickness while satisfying the insulating property, reduces the outer diameter and weight of the cable, and saves the installation space.

Preferably, the main core conductor is made of five types of tinned copper conductors, tinned copper wires with a single wire diameter of 0.485-0.490mm are twisted into a tinned copper wire bundle with a diameter of 2.5mm, and then 37 strands of tinned copper wire are used. The tow is twisted leftward into the main core conductor according to the arrangement structure of 1+6+12+18, and the twisting pitch from the inside to the outside is 20-22D, 16-18D and 12-14D in turn. The conductor of the present invention adopts layered micro-compression, the cable structure is soft, the conductor is round, the appearance is smooth and the gap is small. It is beneficial to the production of 66kV high voltage cable insulation, can reduce the insulation eccentricity and conductor gap discharge phenomenon, and improve the electrical performance and torsion resistance of the cable.

As a further preference, the fiber filament weaving layer is woven with D1500 polyester filament impregnated with a mixture of resorcinol-formaldehyde resin and latex, the weaving pitch is 80-90 mm, and the weaving density is 25%-30%. After extruding the outer sheath into the vulcanized pipe, the impregnated mixed glue can bond the inner sheath and the outer sheath at the polyester yarn position under high temperature and high pressure, thereby improving the tensile strength and tear resistance of the sheath.

Further, the grounded electric cores are, from inside to outside, a grounding conductor and a grounding core shielding layer in sequence.

Preferably, five types of tinned copper conductors are used for the grounding conductor, and tinned copper wires with a single wire diameter of 0.29-0.30 mm are twisted into a tinned copper wire bundle with a diameter of 3.3 mm, and then 7 strands of tinned copper wires are formed. The bundles are twisted to the left into ground conductors according to the arrangement of 1+6, and the twisting pitch is 16-18D. The ground wire core of this structure maintains the same bending radius and torsional amplitude as the main wire core, which can improve the bending performance and torsional performance of the cable.

Further, the width of each side of the filling layer is at least 2.5mm, which can play a good supporting role.

The present invention also provides a production process of the 66kV wind power high-voltage torsion cable, comprising the following steps:

S1: prepare a filling layer, and coat graphite powder on the outside of the filling layer;

S2: prepare the main wire core, wrap the conductive nylon tape around the main wire core conductor, extrude the semiconductive inner shielding layer, the insulating layer and the strippable semiconducting outer shielding layer, and coat the outside of the main wire core with graphite powder;

S3: Prepare the grounding cell, and coat the graphite powder on the outside of the grounding core shielding layer extruded outside the grounding conductor;

S4: Put the main core into the arc-shaped gap of the filling layer, place the grounding cell in the groove between the main cores to form a cable core, extrude a semi-conductive inner sheath outside the cable core, and then weave fiber filaments layer and finally extrude the outer sheath.

Further, in the step S2, the specific method of extruding the insulating layer is: using 66KV high electrical performance ultra-clean ethylene propylene insulating material HEPR, the 20 ℃ volume resistivity of the insulating material is 3.0*10 ¹⁶ Ω·cm, The production workshop is isolated separately, the feeding system adopts a million-level purification room, the blanking system adopts a gravity automatic blanking system, and an impurity analyzer is equipped at the neck position; before extrusion, a 35kV voltage level cleaning material is used to control the extruder. The fuselage and mold are cleaned three times, and then discharged with 66kV insulating material.

Further, in the step S2, the semi-conductive inner shielding layer, the insulating layer and the peelable semi-conductive outer shielding layer are co-extruded in three layers, and the dimensions of the three-layer co-extrusion die are: the diameter of the inner die is 16.6 mm, and the diameter of the middle die is 18.2 mm. mm, the diameter of the outer die is 39mm, and the diameter of the die sleeve is 40.6mm; the angle difference of the taper angle between the middle die and the outer die is 5 to 10°, and the difference between the taper angle of the inner die and the die sleeve is 5 to 10°, which can greatly increase the inner screen. And the extrusion pressure of the outer screen to ensure the tightness of the inner and outer shielding and insulation.

After adopting the above technical solutions, the present invention has positive effects: (1) the filling layer of the present invention has an arc-shaped notch, which is interlocked with the shape of the main battery core, and the distribution of the main wire core and the ground wire core of the cable is more uniform, not only The tensile and torsional resistance of the cable is enhanced, and the structure is compact, the installation space is small, and the twisting pitch is large.

(2) The ethylene-propylene rubber insulating layer of the present invention has excellent electrical properties, can reduce the insulating thickness while meeting the electrical properties, reduce the outer diameter and weight of the cable, make installation more convenient, and ensure the electrical properties and softness of the cable.

(3) In the present invention, graphite powder is all coated on the surface of the main wire core, the ground wire core and the filling layer, which reduces the transition resistance and controls the transition resistance to be less than 500MΩ.

(4) The conductor of the present invention adopts layered micro-compression, the cable structure is soft, the strands and the twisting direction are the same, the appearance is smooth and the gap is small, which is conducive to the production of 66kv high-voltage cable insulation, reduces the eccentricity, and reduces the gap discharge phenomenon , Improve the electrical performance of the cable, the conductor intercept can improve the torsion resistance of the cable.

(5) The fiber filament braided layer of the present invention adopts D1500 polyester filament impregnated with the mixed solution of resorcinol-formaldehyde resin and latex and then woven. The inner sheath and the outer sheath can be bonded together at the position of the polyester yarn, thereby improving the tensile strength and tear resistance of the sheath.

(6) The width of each side of the filling layer is at least 2.5mm, which can play a good supporting role.

Description of drawings

In order to make the content of the present invention easier to understand clearly, the present invention will be described in further detail below according to specific embodiments and in conjunction with the accompanying drawings, wherein

Figure 1 is a schematic diagram of the cable of the present invention.

The numbers in the attached drawings are:

filling layer 100;

Main wire core 200; main wire core conductor 210, conductive nylon tape 220, semi-conductive inner shielding layer 230, insulating layer 240 and strippable semi-conductive outer shielding layer 250;

grounding cell 300; grounding conductor 310, grounding core shielding layer 320;

Semi-conductive inner sheath 400;

Fiber filament braided layer 500;

Outer sheath 600.

Detailed ways

(Example 1)

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the embodiments of the present invention, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The azimuth or positional relationship indicated by ” etc. is based on the azimuth or positional relationship shown in the accompanying drawings, or the azimuth or positional relationship that is usually placed when the product of the invention is used, or the azimuth or positional relationship that is commonly understood by those skilled in the art, It is only for the convenience of describing the present invention and simplifying the description, not to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation of the present invention.

In the description of the embodiments of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "arranged", "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed The connection can also be a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal communication of the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

The present invention provides a 66kV wind power high-voltage torsion cable, which is used to solve the problem of poor cable performance in the prior art. In order to solve the above problem, the general idea of the present invention is as follows:

66kV wind power high voltage torsion cable, including:

Filling layer 100; located in the center of the cable, with three arc-shaped gaps, and the surface is coated with graphite powder;

Three main wire cores 200; arranged in the three arc-shaped notches of the filling layer 100, and the surface is coated with graphite powder;

Three grounded battery cores 300; respectively disposed between the two main cores 200, supported by the filling layer 100, and coated with graphite powder on the surface;

The semi-conductive inner sheath 400 , the fiber braided layer 500 and the outer sheath 600 are sequentially arranged outside the three main cores 200 .

The filling layer of the present invention has an arc-shaped notch, which is interlocked with the shape of the main electric core, which not only enhances the tensile and torsional resistance of the cable, but also has a compact structure, small installation space, and large twisting pitch.

In order to better understand the above technical solutions, the above technical solutions will be described in detail below with reference to the accompanying drawings and specific embodiments.

(Example 1)

Referring to Figure 1, the 66kV wind power high-voltage torsion cable of this embodiment includes:

The filling layer 100 is in the shape of a saddle, located in the center of the cable, with three arc-shaped notches, and the surface is coated with graphite powder; the width of each side of the filling layer 100 is at least 2.5mm. The specific structure is that the center is a steel wire reinforced core, and the external semi-vulcanized extruded semi-conductive rubber material is used. The distance should not exceed 16 times the outer diameter of the central reinforcing steel wire rope. The filling layer of the present invention has an arc-shaped gap, which is interlocked with the shape of the main electric core, and the distribution of the main wire core and the ground wire core of the cable is more uniform, which not only enhances the tensile and torsional resistance of the cable, but also has a compact structure and occupies less space for installation. The space is small and the twisting pitch is large at the same time. And there is a central reinforced steel wire rope to improve the load-bearing capacity of the cable. The cable adopts a 3+3 structure, with a smaller outer diameter, light weight, and a small bending radius, which can be laid in one piece, reducing the installation cost. The width of each side of the filling layer is at least 2.5mm, which can play a good supporting role.

Three main wire cores 200; are arranged in the three arc-shaped notches of the filling layer 100, and the surface is coated with graphite powder; the main wire cores 200 are the main wire core conductor 210, the conductive nylon tape 220, the semiconductive wire from the inside to the outside in sequence The inner shielding layer 230, the insulating layer 240 and the peelable semiconducting outer shielding layer 250; the main core conductor 210 adopts five types of tinned copper conductors, and the single wire diameter of 0.49-0.50mm is twisted into a single diameter It is a 3.3mm tinned copper wire bundle, and then 37 strands of tinned copper wire bundles are twisted leftward into the main core conductor 210 according to the arrangement structure of 1+6+12+18, and the twisting pitch from the inside to the outside is 20 ~22D, 16~18D and 12~14D. The insulating layer 240 is made of HEPR ultra-clean ethylene-propylene rubber, and the volume resistivity of the insulating material at 20° C. is 3.0*10 ¹⁶ Ω·cm.

The three grounding cells 300 are respectively arranged between the two main cores 200 and are supported by the filling layer 100, and the surface is coated with graphite powder; the grounding cells 300 are the grounding conductor 310 and the grounding conductor 310 and the grounding conductor from inside to outside. Wire core shielding layer 320 . The grounding conductor 310 adopts five types of tinned copper conductors, tinned copper wires with a single wire diameter of 0.29-0.30 mm are twisted into a tinned copper wire bundle with a diameter of 3.3 mm, and then 7 strands of tinned copper wire bundles are arranged as follows. The arrangement structure of 1+6 is twisted to the left to form a ground conductor 310, and the twisting pitch is 16-18D.

The semi-conductive inner sheath 400 , the fiber braided layer 500 and the outer sheath 600 are sequentially arranged outside the three main cores 200 . The fiber silk braided layer 500 is braided by D1500 polyester silk impregnated with a mixture of resorcinol-formaldehyde resin and latex, the braiding pitch is 80-90mm, and the braiding density is 25%-30%.

Specifically, the coated graphite powder is ultra-fine graphite powder, which can not only play a conductive role but also reduce the friction between the cores caused by twisting when the cable is in use. The transition resistance between the main wire core and the ground wire core is greater than 1500Ω before the graphite powder is used, and the transition resistance after use is 350~480Ω, the transition resistance is large, and the conduction ability between the main wire core and the ground wire core is poor. When the core fails, it cannot be connected to the ground core in time, and the fault current cannot be conducted out. The accumulation of fault current may easily cause the cable to heat up or even explode.

The production process of 66kV wind power high-voltage torsion cable includes the following steps:

S1: prepare the filling layer 100, and coat the graphite powder on the outside of the filling layer 100 by a wet process; the filling layer 100 is in the shape of a saddle, located in the center of the cable, with three arc-shaped gaps, and the surface is coated with graphite powder; the The width of each side of the filling layer 100 is at least 2.5 mm. The specific structure is that the center is a steel wire reinforced core, and the external semi-vulcanized extruded semi-conductive rubber material is used. The distance should not exceed 16 times the outer diameter of the central reinforcing steel wire rope.

S2: prepare the main wire core 200, wrap the conductive nylon tape 220 around the main wire core conductor 210, extrude the semiconducting inner shielding layer 230, the insulating layer 240 and the peelable semiconducting outer shielding layer 250, and dry the main wire core 200 by a dry process Coated with graphite powder.

Specifically, the graphite powder can be coated by a dry process or a wet process. The dry process adopts the combination of brushing and sifting to coat powder, and the coating thickness is uniform, and the thickness of the powder coating is between 0.005 and 0.01mm. The powder coating is carried out in the powder box, and the graphite powder will not pollute the environment. Firmly attached to the surface of the cable core. In the wet coating technology, the acetone added to the graphite slurry is harmful to the human body, and the drying process needs to be added. Therefore, the dry coating method can improve the production efficiency, but the wet process is suitable for irregular structures.

The specific method of extruding the insulating layer 240 is as follows: using 66KV high electrical performance ultra-clean ethylene propylene insulating material HEPR, the 20 ℃ volume resistivity of the insulating material is 3.0*10 ¹⁶ Ω·cm, the production workshop is isolated separately, and the feeding system adopts millions of First-class purification-level purification room, the blanking system adopts gravity automatic blanking system, and is equipped with an impurity analyzer at the machine neck position to strictly control the cleanliness. Before extrusion, use the cleaning material of 35kV voltage level to clean the body and mold of the extruder three times, and then use 66kV insulating material for discharging to ensure the purity of the insulating layer during the production process. In the step S2, the semi-conductive inner shielding layer 230, the insulating layer 240 and the peelable semi-conductive outer shielding layer 250 are co-extruded in three layers. The dimensions of the three-layer co-extrusion die are: the diameter of the inner die is 16.6 mm, and the diameter of the middle die is 18.2 mm. , the diameter of the outer die is 39mm, and the diameter of the die sleeve is 40.6mm; in order to reduce the eccentricity of the insulation, the inner die is 0.2-0.4mm larger than the outer diameter of the conductor, and before the conductor enters the extrusion rubber, it must pass through the pre-formed guide wheel to straighten the shape of the conductor Roundness; the difference between the cone angle of the middle mold and the outer mold is 5-10°, and the difference between the cone angle of the inner mold and the mold sleeve is 5-10° to ensure the semi-conductive inner shielding layer and the peelable semi-conductive outer shield The layer is tightly bonded to the insulation, increasing the extrusion pressure of the semiconducting inner shield and the peelable semiconducting outer shield.

In this step, the thickness of the semi-conductive nylon tape 220 is 0.12 mm, the width is 40 mm, and the overlap ratio is 20% to 25%. The semi-conductive inner shielding layer 230 is produced by a 90 extruder, and the temperature of the body is 95°C to 105°C. The insulating layer 240 made of ethylene-propylene rubber is produced by a 150 extruder, and the temperature of the body is 90°C to 100°C. The peelable semi-conductive outer shielding layer 250 is produced by a 90 extruder, and the body temperature is 90°C to 100°C. The temperature of the head of the three-layer co-extrusion was set at 100°C to 110°C. The production speed is 6~7m/min, and the air pressure is 7~8bar. The thicknesses of the semiconducting inner shielding layer 230 , the insulating layer 240 and the semiconducting outer shielding layer 250 are monitored in real time by using an on-line monitoring outer diameter eccentricity device. The thickness of the semiconducting inner shield is 0.8mm. The average thickness of the edge layer is 10.5mm, and the thickness of the thinnest point is 9.35mm. The peelable semiconducting outer shield has a thickness of 1.0mm.

S3: preparing the grounding cell 300, extruding the grounding core shielding layer 320 outside the grounding conductor 310, and coating the outside of the grounding cell 300 with graphite powder by dry process;

S4: Put the main wire core 200 into the arc-shaped gap of the filling layer 100, place the grounding cell 300 in the groove between the main wire cores 200 to form a cable core, and extrude a semi-conductive inner core with a thickness of 1 mm outside the cable core The sheath 400 is then braided with the fiber filament braid 500, and finally the outer sheath 600 is extruded. The outer sheath 600 is made of high oil resistance, diesel oil resistance, high flame retardant, salt spray resistance and environmental protection ethylene vinyl acetate mixture that conforms to EM 2 in EN50363-2-1. The nominal thickness is 5mm, and the thinnest point is 4.15mm.

The braiding process of the braided fiber braided layer 500 adopts a 32-spindle braiding machine, the braiding intercept is 80-90mm, the braiding density is 25%-30%, and the braiding speed is 1.5m/min. The cable is mainly used in the axial direction. To withstand the torsional force, in order to mention the radial force range, the braiding angle is controlled at 45°~50°.

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present invention in further detail. It should be understood that the above descriptions are only specific embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

The 1.66kV wind power high-voltage torsion cable is characterized in that it includes: Filling layer (100); located in the center of the cable, provided with three arc-shaped gaps, and the surface is coated with graphite powder; Three main wire cores (200); arranged in the three arc-shaped notches of the filling layer (100), and the surfaces are coated with graphite powder; Three grounded battery cores (300); respectively disposed between the two main wire cores (200), supported by the filling layer (100), and coated with graphite powder on the surface; The semi-conductive inner sheath (400), the fiber braided layer (500) and the outer sheath (600) are sequentially arranged outside the three main wire cores (200). 2. 66kV wind power high-voltage torsion cable according to claim 1, is characterized in that: The main wire core (200) consists of a main wire core conductor (210), a conductive nylon tape (220), a semiconductive inner shielding layer (230), an insulating layer (240) and a strippable semiconducting outer shielding layer (230) in sequence from the inside to the outside. 250); The insulating layer (240) adopts HEPR ultra-clean ethylene-propylene rubber. 3. 66kV wind power high-voltage torsion cable according to claim 2, is characterized in that: The main core conductor (210) adopts five types of tinned copper conductors, and tinned copper wires with a single wire diameter of 0.485 to 0.490 mm are twisted leftward into a tinned copper wire bundle with a diameter of 2.5 mm, and then 37 strands of tinned copper wire are plated. The tin-copper wire bundles are normally twisted into the main core conductor (210) according to the arrangement structure of 1+6+12+18, and the twisting pitches from the inside to the outside are 20-22D, 16-18D and 12-14D in sequence. 4. 66kV wind power high-voltage torsion cable according to claim 1, is characterized in that: The fiber filament braided layer (500) is woven with D1500 polyester filament impregnated with a mixture of resorcinol-formaldehyde resin and latex, the weaving pitch is 80-90 mm, and the weaving density is 25-30%. 5. 66kV wind power high-voltage torsion cable according to claim 1, is characterized in that: The grounding cell (300) is sequentially composed of a grounding conductor (310) and a grounding core shielding layer (320) from the inside to the outside. 6. 66kV wind power high-voltage torsion cable according to claim 5, is characterized in that: The grounding conductor (310) adopts five types of tinned copper conductors, tinned copper wires with a single wire diameter of 0.390 to 0.395 mm are twisted into a tinned copper wire bundle with a diameter of 3.4 mm, and then seven strands of tinned copper wires are formed. The bundles are twisted leftwardly into a ground conductor (310) according to a 1+6 arrangement, and the twisting pitch is 16-18D. 7. 66kV wind power high-voltage torsion cable according to claim 1, is characterized in that: The width of each side of the filling layer (100) is at least 2.5 mm. 8. the production technology of the 66kV wind power high-voltage torsion cable according to one of claims 1 to 7, is characterized in that comprising the following steps: S1: prepare a filling layer (100), and coat graphite powder on the outside of the filling layer; S2: preparing the main wire core (200), wrapping the conductive nylon tape (220) around the main wire core conductor (210), extruding the semiconducting inner shielding layer (230), the insulating layer (240) and the peelable semiconducting outer shielding layer (250), coating graphite powder on the outside of the main wire core (200); S3: preparing a grounding cell (300), extruding a grounding core shielding layer (320) outside the grounding conductor (310), and coating graphite powder on the outside of the grounding cell (300); S4: Put the main wire core (200) into the arc-shaped gap of the filling layer (100), place the grounding cell (300) in the groove between the main wire cores (200) to form a cable core, and extrude it outside the cable core The semi-conductive inner sheath (400) is produced, the fiber filament braided layer (500) is then woven, and finally the outer sheath (600) is extruded. 9. the production technology of 66kV wind power high-voltage torsion cable according to claim 8, is characterized in that: In the step S2, the specific method of extruding the insulating layer (240) is as follows: using 66KV high-electric performance ultra-clean ethylene-propylene insulating material HEPR, the 20°C volume resistivity of the insulating material is 3.0*10 ¹⁶ Ω·cm, The production workshop is isolated separately, the feeding system adopts a million-level purification room, the blanking system adopts a gravity automatic blanking system, and an impurity analyzer is equipped at the neck position; 35kV ethylene-propylene rubber cleaning material is used before extrusion. The fuselage and die of the extruder were cleaned three times, and then discharged with 66kV insulating material. 10. the production technology of 66kV wind power high-voltage torsion cable according to claim 9, is characterized in that: In the step S2, the semi-conductive inner shielding layer (230), the insulating layer (240) and the peelable semi-conductive outer shielding layer (250) are co-extruded in three layers, and the size of the mold for the three-layer co-extrusion is: the diameter of the inner mold is 16.6 mm , the diameter of the middle mold is 18.2mm, the diameter of the outer mold is 39mm, and the diameter of the mold sleeve is 40.6mm; the difference between the cone angle of the middle mold and the outer mold is 5 to 10°, and the difference of the cone angle between the inner mold and the mold sleeve is 5 to 10°.