CN110690003A - 66kV wind power high-voltage torsion cable and production process thereof - Google Patents
66kV wind power high-voltage torsion cable and production process thereof Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers by extrusion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/28—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances natural or synthetic rubbers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
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Abstract
The invention discloses a 66kV wind power high-voltage torsion cable and a production process thereof, wherein the cable comprises: saddle-shaped supporting filling layers; the cable is positioned in the center and provided with three arc-shaped notches, and graphite powder is coated on the surface of each notch; three main wire cores; the graphite powder is arranged in the three arc-shaped gaps of the filling layer, and the graphite powder is coated on the surface of the filling layer; three grounding electric cores; the two main wire cores are respectively arranged between the two main wire cores and supported by a filling layer, and graphite powder is coated on the surface of the two main wire cores; the semi-conductive inner sheath layer, the fiber yarn weaving layer and the outer sheath are sequentially arranged outside the three main wire cores. The filling layer of the invention is provided with the arc-shaped gap which is mutually embedded with the shape of the main core, thereby not only enhancing the tensile property and the torsion resistance of the cable, but also having compact structure, small occupied space for installation and large twisting pitch.
Description
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
Currently, the world is keen on continuous renewable new energy sources, and wind power generation plays a very important role. The driving force of future wind power technology development mainly comes from the rising offshore wind farm construction, and the development trend is irreversible. The offshore wind power generation unit gradually develops to a large-scale unit with more than 10MW, and the supporting foundation moves from a fixed type to a floating type. The scale of offshore wind farms will continue to grow towards larger scales. With the continuous increase of the capacity of the offshore wind power single unit, the voltage grade of the offshore cable in the field of 33kV gradually becomes a bottleneck for restricting the design of the offshore cable system. Thus, some european offshore wind farms are first attempting to increase the voltage level of the marine cables in the farm. The uk Blyth offshore exemplary wind farm under construction is the first offshore wind farm worldwide with 66kV on-site cable voltage rating, and many projects under planning or already bidding will also employ a 66kV voltage rating scheme. According to the prediction of the denmark wind energy consulting agency, the european market will turn to the 66kV voltage class overall from 2019. However, the domestic high-voltage rubber sleeve cable has large outer diameter and heavy weight and cannot meet the use requirement of the high-voltage wind power torsion cable.
Disclosure of Invention
The invention aims to solve the problem that the performance of the existing cable cannot be met, and provides a 66kV torsion-resistant wind power flexible cable which is strong in torsion resistance, excellent in electrical performance, small in outer diameter and light in weight and a production process thereof.
The technical scheme for realizing the purpose of the invention is that the 66kV wind power high-voltage torsion cable comprises: a saddle-shaped support filling layer; the cable is positioned in the center and provided with three arc-shaped notches, and graphite powder is coated on the surface of each notch; three main wire cores; the graphite powder is arranged in the three arc-shaped gaps of the filling layer, and the graphite powder is coated on the surface of the filling layer; three grounding electric cores; the two main wire cores are respectively arranged between the two main wire cores and supported by a filling layer, and graphite powder is coated on the surface of the two main wire cores; the semi-conductive inner sheath layer, the fiber yarn weaving layer and the outer sheath are sequentially arranged outside the three main wire cores. The filling layer of the invention is provided with the arc-shaped gap which is mutually embedded with the shape of the main core, thereby not only enhancing the tensile property and the torsion resistance of the cable, but also having compact structure, small outer diameter of the cable and light weight.
Further, the main wire core sequentially comprises a main wire core conductor, a conductive nylon belt, a semi-conductive inner shielding layer, an insulating layer and a strippable semi-conductive outer shielding layer from inside to outside;
the insulating layer adopts HEPR ultra-clean ethylene propylene rubber. The ethylene propylene rubber insulating layer has high volume resistivity, and the thickness is reduced while the insulativity is met, so that the outer diameter and the weight of the cable are reduced, and the occupied space for installation is saved.
Preferably, the main core conductor is a five-type tin-plated copper conductor, tin-plated copper wires with the monofilament diameter of 0.485-0.490 mm are stranded into a tin-plated copper wire bundle with the diameter of 2.5mm, then 37 tin-plated copper wire bundles are stranded into the main core conductor in the left direction according to an arrangement structure of 1+6+12+18, and the stranding pitch from inside to outside is 20-22D, 16-18D and 12-14D in sequence. The conductor of the invention adopts layered micro-compression, and the cable has soft structure, round conductor, smooth appearance and small gap. The insulating production of 66kV high-voltage cables is facilitated, the insulating eccentricity and conductor gap discharge phenomena can be reduced, and the electrical property and the torsion resistance of the cables are improved.
Preferably, the fiber yarn weaving layer is woven by dipping D1500 polyester yarn into a mixed solution of resorcinol-formaldehyde resin and latex, the weaving pitch is 80-90 mm, and the weaving density is 25-30%. After the impregnated mixed glue is extruded out and the outer sheath enters the vulcanizing pipeline, the inner sheath and the outer sheath can be bonded at the position of the polyester yarn at high temperature and high pressure, so that the tensile strength and the tearing resistance of the sheath are improved.
Furthermore, the grounding electric core is sequentially provided with a grounding conductor and a grounding wire core shielding layer from inside to outside.
Preferably, the grounding conductor is a five-type tin-plated copper conductor, tin-plated copper wires with the monofilament diameter of 0.29-0.30 mm are twisted into a tin-plated copper wire bundle with the diameter of 3.3mm, then 7 tin-plated copper wire bundles are twisted into the grounding conductor in the left direction according to an arrangement structure of 1+6, and the twisting pitch is 16-18D. The ground wire core and the main wire core keep the same bending radius and torsion amplitude, and the bending performance and the torsion performance of the cable can be improved.
Furthermore, the width of each side of the filling layer is at least 2.5mm, so that the filling layer can play a good supporting role.
The invention also provides a production process of the 66kV wind power high-voltage torsion cable, which comprises the following steps:
s1: preparing a filling layer, and coating graphite powder outside the filling layer;
s2: preparing a main wire core, wrapping a conductive nylon belt outside a main wire core conductor, extruding a semiconductive inner shielding layer, an insulating layer and a strippable semiconductive outer shielding layer, and coating graphite powder outside the main wire core;
s3: preparing a grounding electric core, and extruding graphite powder outside a grounding conductor to coat the outside of a shielding layer of a grounding wire core;
s4: put into the arc breach department of filling layer with the thread core, place ground connection electric core and form the cable core in the recess between the thread core together, extrude semiconduction inner sheath outside the cable core, weave the cellosilk weaving layer again, extrude the oversheath at last.
Further, in the step S2, the specific method for extruding the insulating layer is as follows: adopts 66KV high-electrical-property ultra-clean ethylene propylene insulating material HEPR, and the volume resistivity of the insulating material at 20 ℃ is 3.0 x 1016Omega cm, the production workshop is isolated independently, the feeding system adopts a million-level purification room, the blanking system adopts a gravity automatic blanking system, and an impurity analyzer is arranged at the position of a machine neck; before extrusion, the machine body and the die of the rubber extruder are cleaned for three times by using a cleaning material with the voltage grade of 35kV, and then a material is discharged by using a 66kV insulating material.
Further, in the step S2, the semiconductive inner shield layer, the insulating layer, and the strippable semiconductive outer shield layer are co-extruded, and the size of the die for co-extrusion of the three layers is: the diameter of the inner die is 16.6mm, the diameter of the middle die is 18.2mm, the diameter of the outer die is 39mm, and the diameter of the die sleeve is 40.6 mm; the angle difference of the taper angles of the middle mold and the outer mold is 5-10 degrees, the angle difference of the taper angles of the inner mold and the mold sleeve is 5-10 degrees, the extrusion pressure of the inner screen and the outer screen can be greatly increased, and the tight combination degree of the inner shield and the outer shield and insulation is ensured.
After the technical scheme is adopted, the invention has the positive effects that: (1) the filling layer is provided with the arc-shaped gap, the arc-shaped gap is mutually clamped and embedded with the main core, the main core and the ground core of the cable are more uniformly distributed, the tensile property and the torsion resistance of the cable are enhanced, the structure is compact, the occupied space for installation is small, and the twisting pitch is large.
(2) The ethylene propylene rubber insulating layer disclosed by the invention has excellent electrical property, can reduce the insulating thickness while meeting the electrical property, so that the outer diameter and the weight of a cable are reduced, the installation is more convenient, and the electrical property and the flexibility of the cable can be ensured.
(3) According to the invention, the graphite powder is coated on the surfaces of the main wire core, the ground wire core and the filling layer, so that the transition resistance is reduced, and the transition resistance is controlled to be below 500 MOmega.
(4) The conductor of the invention adopts layered micro-compression, the cable has soft structure, the directions of the stranded wire and the compound twisted wire are the same, the appearance is smooth, the gap is small, the insulation production of the 66kv high-voltage cable is facilitated, the eccentricity is reduced, the gap discharge phenomenon is reduced, the electrical property of the cable is improved, the conductor intercept is large, and the torsion resistance of the cable can be improved.
(5) The fiber yarn weaving layer is woven by dipping D1500 polyester yarn into the mixed liquid of resorcinol-formaldehyde resin and latex, and the dipped mixed glue can enable the inner protection layer and the outer protection layer to be bonded at the position of the polyester yarn under high temperature and high pressure after extruding the outer protection layer to enter a vulcanization pipeline, so that the tensile strength and the tearing resistance of the protection layer are improved.
(6) The width of each side of the filling layer is at least 2.5mm, and the filling layer can play a good supporting role.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which
Fig. 1 is a schematic view of a cable according to the present invention.
The reference numbers in the drawings are as follows:
a filling layer 100;
a main wire core 200; a main core conductor 210, a conductive nylon tape 220, a semi-conductive inner shield layer 230, an insulating layer 240 and a strippable semi-conductive outer shield layer 250;
a grounding electric core 300; a ground conductor 310, a ground core shielding layer 320;
a semi-conductive inner sheath 400;
a fiber yarn braid 500;
an outer sheath 600.
Detailed Description
(example 1)
In order to make the objects, 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 drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained 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", etc. indicate orientations or positional relationships that are usually placed when the product of the present invention is used, or orientations or positional relationships that are conventionally understood by those skilled in the art, which are used for convenience of description and simplicity of description, but do not indicate or imply that the equipment or element in question must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
In the description of the embodiments of the present invention, it should be further noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention provides a 66kV wind power high-voltage torsion cable, which is used for solving the problem of poor cable performance in the prior art, and in order to solve the problem, the general idea of the invention is as follows:
66kV wind-powered electricity generation high pressure torsion cable includes:
a filling layer 100; the cable is positioned in the center and provided with three arc-shaped notches, and graphite powder is coated on the surface of each notch;
three main wire cores 200; the graphite powder is arranged in three arc-shaped gaps of the filling layer 100, and the graphite powder is coated on the surface of the filling layer;
three grounding cells 300; the two main wire cores 200 are respectively arranged between the two main wire cores and supported by a filling layer 100, and graphite powder is coated on the surface of each main wire core;
the semiconductive inner sheath 400, the fiber yarn woven layer 500 and the outer sheath 600 are sequentially arranged outside the three main wire cores 200.
The filling layer of the invention is provided with the arc-shaped gap which is mutually embedded with the shape of the main core, thereby not only enhancing the tensile property and the torsion resistance of the cable, but also having compact structure, small occupied space for installation and large twisting pitch.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
(example 1)
Referring to fig. 1, the 66kV wind power high voltage torsion cable of the embodiment includes:
a filling layer 100; the cable is saddle-shaped, is positioned in the center of the cable, is provided with three arc-shaped notches, and is coated with graphite powder on the surface; 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, the outer part is semi-vulcanized and extruded with a semiconductive rubber material, wherein the steel wire reinforced core is a galvanized steel core steel wire rope with the monofilament diameter of 0.22-0.26 mm, the twisting direction is the left direction, and the twisting pitch is not more than 16 times of the outer diameter of the central reinforced steel wire rope. The filling layer is provided with the arc-shaped gap, the arc-shaped gap is mutually clamped and embedded with the main core, the main core and the ground core of the cable are more uniformly distributed, the tensile property and the torsion resistance of the cable are enhanced, the structure is compact, the occupied space for installation is small, and the twisting pitch is large. And the central reinforced steel wire rope improves the load bearing capacity of the cable. The cable adopts 3+3 structure, and the external diameter is littleer, light in weight, and bending radius is little, can lay by whole root, has reduced installation cost. The width of each side of the filling layer is 2.5mm at least, and the filling layer can play a good supporting role.
Three main wire cores 200; the graphite powder is arranged in three arc-shaped gaps of the filling layer 100, and the graphite powder is coated on the surface of the filling layer; the main wire core 200 comprises a main wire core conductor 210, a conductive nylon tape 220, a semi-conductive inner shielding layer 230, an insulating layer 240 and a strippable semi-conductive outer shielding layer 250 from inside to outside in sequence; the main core conductor 210 is made of five types of tinned copper conductors, tinned copper wires with the monofilament diameter of 0.49-0.50 mm are twisted into tinned copper wire bundles with the diameter of 3.3mm, then 37 tinned copper wire bundles are twisted into the main core conductor 210 in the left direction according to an arrangement structure of 1+6+12+18, and the twisting pitches from inside to outside are 20-22D, 16-18D and 12-14D in sequence. The insulating layer 240 is made of HEPR ultra-clean ethylene propylene rubber, and the volume resistivity of the insulating material at 20 ℃ is 3.0 x 1016Ω·cm。
Three grounding cells 300; the two main wire cores 200 are respectively arranged between the two main wire cores and supported by a filling layer 100, and graphite powder is coated on the surface of each main wire core; the grounding electric core 300 is sequentially provided with a grounding conductor 310 and a ground wire core shielding layer 320 from inside to outside. The grounding conductor 310 is made of five types of tin-plated copper conductors, tin-plated copper wires with the monofilament diameter of 0.29-0.30 mm are twisted into a tin-plated copper wire bundle with the diameter of 3.3mm, then 7 tin-plated copper wire bundles are twisted into the grounding conductor 310 in the left direction according to an arrangement structure of 1+6, and the twisting pitch is 16-18D.
The semiconductive inner sheath 400, the fiber yarn woven layer 500 and the outer sheath 600 are sequentially arranged outside the three main wire cores 200. The fiber yarn weaving layer 500 is woven by dipping D1500 polyester yarn into mixed solution of resorcinol-formaldehyde resin and latex, the weaving pitch is 80-90 mm, and the weaving density is 25-30%.
Particularly, the coated graphite powder is ultra-fine graphite powder, so that the electric conduction effect can be achieved, and the friction force between the wire cores caused by torsion when the cable is used can be reduced. Transition resistance between the main wire core and the ground wire core before not using graphite powder is greater than 1500 omega, and transition resistance is 350 ~ 480 omega after using, and transition resistance is big, and the conductivity is poor between main wire core and the ground wire core, when the main wire core breaks down, can not in time switch on with the ground wire core, can not switch on out fault current, and fault current's accumulation causes the cable to generate heat even the explosion easily.
The production process of the 66kV wind power high-voltage torsion cable comprises the following steps:
s1: preparing a filling layer 100, and coating graphite powder outside the filling layer 100 by adopting a wet process; the filling layer 100 is saddle-shaped, is positioned in the center of the cable, is provided with three arc-shaped gaps, and is coated with graphite powder on the surface; 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, the outer part is semi-vulcanized and extruded with a semiconductive rubber material, wherein the steel wire reinforced core is a galvanized steel core steel wire rope with the monofilament diameter of 0.22-0.26 mm, the twisting direction is the left direction, and the twisting pitch is not more than 16 times of the outer diameter of the central reinforced steel wire rope.
S2: preparing a main wire core 200, wrapping a conductive nylon tape 220 outside a main wire core conductor 210, extruding a semi-conductive inner shielding layer 230, an insulating layer 240 and a strippable semi-conductive outer shielding layer 250, and coating graphite powder outside the main wire core 200 by a dry process.
In particular, the graphite powder may be coated by a dry process or a wet process. The dry process adopts a mode of combining powder brushing and screen leakage to coat powder, the coating thickness is uniform, the powder coating thickness is 0.005-0.01 mm, the powder coating is carried out in a powder box, the graphite powder does not pollute the environment, and the graphite powder is uniformly and firmly attached to the surface of a cable core. In the wet coating technology, acetone added into graphite slurry is harmful to human bodies, and a drying process is also added, so that the dry coating method can improve the production efficiency, but the wet process is suitable for irregular structures.
The specific method for extruding the insulating layer 240 is as follows: adopts 66KV high-electrical-property ultra-clean ethylene propylene insulating material HEPR, and the volume resistivity of the insulating material at 20 ℃ is 3.0 x 1016Omega cm, the production workshop is isolated independently, the feeding system adopts a million-level purification room, the blanking system adopts a gravity automatic blanking system, and the machine neck is provided with an impurity separatorAnd (5) analyzing the instrument and strictly controlling the cleanliness. Before extrusion, the machine body and the die of the rubber extruder are cleaned for three times by using a cleaning material with the voltage grade of 35kV, and then a material is discharged by using a 66kV insulating material, so that the purity of the insulating layer in the production process is ensured. And in the step S2, co-extruding the semiconductive inner shielding layer 230, the insulating layer 240 and the strippable semiconductive outer shielding layer 250, wherein the size of a die for the co-extrusion of the three layers is as follows: the diameter of the inner die is 16.6mm, the diameter of the middle die is 18.2mm, the diameter of the outer die is 39mm, and the diameter of the die sleeve is 40.6 mm; in order to reduce the insulation eccentricity, the inner die is 0.2-0.4 mm larger than the outer diameter of the conductor, and the conductor passes through a pre-forming guide wheel before entering rubber extrusion so as to straighten the shape roundness of the conductor; the angle difference of the taper angles of the middle die and the outer die is 5-10 degrees, the angle difference of the taper angles of the inner die and the die sleeve is 5-10 degrees, so that the semi-conductive inner shielding layer and the strippable semi-conductive outer shielding layer are tightly combined with insulation, and the extrusion pressure of the semi-conductive inner shielding layer and the strippable semi-conductive outer shielding layer is increased.
In this step, the thickness of the semiconductive nylon belt 220 is 0.12mm, the width thereof is 40mm, and the covering rate is 20-25%. The semi-conductive inner shielding layer 230 is produced by adopting a 90-degree rubber extruding machine, and the temperature of the machine body is 95-105 ℃. An insulating layer 240 made of ethylene propylene rubber is produced by adopting a 150-degree rubber extruding machine, and the temperature of a machine body is 90-100 ℃. The strippable semi-conductive outer shielding layer 250 is produced by a 90-degree rubber extruding machine, and the temperature of the machine body is 90-100 ℃. The time head temperature is set to 100-110 ℃ when the three-layer co-extrusion is carried out. The production speed is 6-7 m/min, and the air pressure is 7-8 bar. The thicknesses of the semiconductive inner shield layer 230, the insulating layer 240 and the semiconductive outer shield layer 250 are monitored in real time by using an online outer diameter eccentricity monitoring device. The thickness of the semiconductive inner shield layer was 0.8 mm. The thickness of the insulating layer was 10.5mm on average, and the thinnest point was 9.35 mm. The thickness of the strippable semiconductive outer shield layer was 1.0 mm.
S3: preparing a grounding electric core 300, extruding a grounding wire core shielding layer 320 outside a grounding conductor 310, and coating graphite powder outside the grounding electric core 300 by a dry process;
s4: the main wire core 200 is placed at the arc-shaped gap of the filling layer 100, the grounding electric core 300 is placed in the groove between the main wire cores 200 to form a cable core together, the semi-conductive inner protection layer 400 with the thickness of 1mm is extruded outside the cable core, the fiber silk weaving layer 500 is woven, and the outer sheath 600 is extruded finally. The outer sheath 600 is made of an environment-friendly ethylene vinyl acetate mixture which is high in engine oil resistance, diesel oil resistance, salt mist resistance and the like and accords with EM 2 in EN50363-2-1, the nominal thickness is 5mm, and the thinnest point is 4.15 mm.
The knitting process of the knitting fiber yarn knitting layer 500 adopts a 32-spindle knitting machine, the knitting intercept is 80-90 mm, the knitting density is 25% -30%, the knitting speed is 1.5m/min, the cable mainly bears the axial bearing torsion force when in use, and the knitting angle is controlled to be 45-50 degrees in order to improve the radial bearing range.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1.66kV wind-powered electricity generation high pressure twists reverse cable, its characterized in that includes:
a filler layer (100); the cable is positioned in the center and provided with three arc-shaped notches, and graphite powder is coated on the surface of each notch;
three main wire cores (200); the graphite powder is arranged in the three arc-shaped gaps of the filling layer (100), and the graphite powder is coated on the surface of the filling layer;
three grounding cells (300); the two main wire cores (200) are respectively arranged between the two main wire cores and supported by a filling layer (100), and graphite powder is coated on the surface of the filling layer;
the semi-conductive inner sheath (400), the fiber silk braid layer (500) and the outer sheath (600) are sequentially arranged outside the three main wire cores (200).
2. The 66kV wind power high-voltage torsion cable according to claim 1, wherein:
the main wire core (200) is sequentially provided with a main wire core conductor (210), a conductive nylon belt (220), a semi-conductive inner shielding layer (230), an insulating layer (240) and a strippable semi-conductive outer shielding layer (250) from inside to outside;
the insulating layer (240) is made of HEPR ultra-clean ethylene propylene rubber.
3. The 66kV wind power high-voltage torsion cable according to claim 2, wherein:
the main core conductor (210) adopts five types of tinned copper conductors, tinned copper wires with the monofilament diameter of 0.485-0.490 mm are twisted into tinned copper wire bundles with the diameter of 2.5mm in the left direction, then 37 tinned copper wire bundles are regularly twisted into the main core conductor (210) according to an arrangement structure of 1+6+12+18, and the twisting pitches from inside to outside are 20-22D, 16-18D and 12-14D in sequence.
4. The 66kV wind power high-voltage torsion cable according to claim 1, wherein:
the fiber yarn weaving layer (500) is woven by dipping D1500 polyester yarn into mixed solution of resorcinol-formaldehyde resin and latex, the weaving pitch is 80-90 mm, and the weaving density is 25-30%.
5. The 66kV wind power high-voltage torsion cable according to claim 1, wherein:
the grounding electric core (300) is sequentially provided with a grounding conductor (310) and a ground wire core shielding layer (320) from inside to outside.
6. The 66kV wind power high-voltage torsion cable according to claim 5, wherein:
the grounding conductor (310) is a five-type tin-plated copper conductor, tin-plated copper wires with the monofilament diameter of 0.390-0.395 mm are stranded into a tin-plated copper wire bundle with the diameter of 3.4mm, then 7 tin-plated copper wire bundles are stranded into the grounding conductor (310) in the left direction according to an arrangement structure of 1+6, and the stranding pitch is 16-18D.
7. The 66kV wind power high-voltage torsion cable according to claim 1, wherein:
the width of each side of the filling layer (100) is at least 2.5 mm.
8. The production process of the 66kV wind power high-voltage torsion cable according to one of claims 1 to 7, characterized by comprising the following steps:
s1: preparing a filling layer (100), and coating graphite powder outside the filling layer;
s2: preparing a main wire core (200), wrapping a conductive nylon belt (220) outside a main wire core conductor (210), extruding a semi-conductive inner shielding layer (230), an insulating layer (240) and a strippable semi-conductive outer shielding layer (250), and coating graphite powder outside the main wire core (200);
s3: preparing a grounding electric core (300), extruding a grounding wire core shielding layer (320) outside a grounding conductor (310), and coating graphite powder outside the grounding electric core (300);
s4: the main wire core (200) is placed at the arc-shaped notch of the filling layer (100), the grounding electric core (300) is placed in the groove between the main wire cores (200) to form a cable core together, the semi-conductive inner protection layer (400) is extruded out of the cable core, the fiber yarn weaving layer (500) is woven, and finally the outer sheath (600) is extruded out.
9. The production process of the 66kV wind power high-voltage torsion cable according to claim 8, characterized in that:
in the step S2, the specific method for extruding the insulating layer (240) is as follows: adopts 66KV high-electrical-property ultra-clean ethylene propylene insulating material HEPR, and the volume resistivity of the insulating material at 20 ℃ is 3.0 x 1016Omega cm, the production workshop is isolated independently, the feeding system adopts a million-level purification room, the blanking system adopts a gravity automatic blanking system, and an impurity analyzer is arranged at the position of a machine neck; before extrusion, the machine body and the die of the rubber extruding machine are cleaned for three times by using an ethylene propylene rubber cleaning material with the voltage grade of 35kV, and then a 66kV insulating material is used for discharging.
10. The production process of the 66kV wind power high-voltage torsion cable according to claim 9, characterized by comprising the following steps:
and in the step S2, the semiconductive inner shielding layer (230), the insulating layer (240) and the strippable semiconductive outer shielding layer (250) are co-extruded, wherein the size of a die for the co-extrusion of the three layers is as follows: the diameter of the inner die is 16.6mm, the diameter of the middle die is 18.2mm, the diameter of the outer die is 39mm, and the diameter of the die sleeve is 40.6 mm; the angle difference of the taper angles of the middle die and the outer die is 5-10 degrees, and the angle difference of the taper angles of the inner die and the die sleeve is 5-10 degrees.
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| CN114664483A (en) * | 2022-03-31 | 2022-06-24 | 远东电缆有限公司 | Medium-voltage movable winding composite cable |
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