CN104376904B - Submarine high voltage cable and manufacturing method thereof - Google Patents

Abstract

The invention belongs to the technical field of cables and particularly relates to a submarine high voltage cable which is formed by a conducting unit, a metal shielding layer, a water-resistant layer, an inner sheath, an armoring layer, an outer sheath and an outer sheath protective layer which are arranged sequentially from inside to outside. The conducting unit is formed by a conductor, an insulation layer, an insulation shielding layer and a conductor protective layer. On one of any cross sections, the circle center of the conductor coincides with the circular center of the insulation layer, the diameter of the insulation layer is 1.5 to 5 times that of the conductor, and the minimum value of the thickness of the insulation layer is 1.5mm. Filling rope groups and reinforcing part groups are distributed outside the inner sheath in an alternating mode and cling to the inner sheath. The outer sheath protective layer is made of polyamide. The insulation layer is made of organosilane crosslinked polyethylene or special materials. The invention further discloses a manufacturing method of the submarine high voltage cable. The submarine high voltage cable mainly has the following advantages of being proper in mechanical performance redundancy, capable of saving resources, high in abrasion resistance, water seepage resistance, sea water resistance and shielding performance and good in high voltage transmission.

Description

Seabed high tension cable and its manufacture method

Technical field

The invention belongs to seabed cable technical field, especially relate to seabed high tension cable and its manufacture method.

Background technology

Earth surface is divided into, by each big land, the vast waters communicating with each other and is referred to as ocean, its gross area of the earth be about 3.6 hundred million square kilometres, account for earth surface amass 71%, approximately equal to the 2.5 of land surface times, world ocean is a huge treasure-house.It has a large amount of things necessary to the mankind and abundant industrial resources.Five main ocean of the earth are the Pacific Ocean, the Atlantic Ocean and the Indian Ocean, the Arctic Ocean, Antarctic Ocean, and major part is with land and sea-floor relief line as boundary.

Develop rapidly with industrial, people increasingly increase to the exploration scale of Yu Haiyang, the value of ocean is also more paid attention to by people, for this, need to lay various submarine cables and be used as infrastructure, in submarine cable, be most commonly used that seabed high tension cable, submarine optical fiber cable, sea floor optoelectronic composite cable.

In prior art, people had carried out research for seabed high tension cable, such as：Publication No. is CN102290135A, entitled：Rated voltage 220kV tri- core photoelectric composite submarine cable, outer drape over one's shoulders layer including be sequentially distributed from outside to inside, armor and inner liner, it is provided with three two biphase circumscribed electric units in described inner liner, described electric unit and described inner liner surrounded three at gap be all filled with multiple fills units, electric unit described in three and all of fills unit all stranded formation main core segments of one extra large cable, the main core of extra large cable after stranded is exceptionally surrounded with gluing strap, in all of fills unit, wherein at least one is light unit, remaining fills unit is gasket for packing, the rated voltage of this kind of cable has reached 220KV.

For another example：Publication No. is CN101807450A, entitled：A kind of sea electric power cable; including the conductor (1) arranging from the inside to the outside, semi-conductive layer (2), insulating barrier (3), cushion (4), lead set (5), inner restrictive coating (6), armor (7) and armouring external protection (8) it is characterised in that：The mixed layer that described inner restrictive coating (6) is in series with insulation two kinds of form head and the tail of inner restrictive coating by semiconductive inner restrictive coating, solves the problems, such as induced potential, and reduces loss, improves the purpose of current-carrying capacity.

Publication No. is CN101807453A, entitled：Power cable for seabed; including the core (1) arranging from the inside to the outside, screen layer (2), insulation (3), insulator screen layer and sheath (4), armouring inner cushion layer (5), armor (6) and armouring external protection (7) it is characterised in that：Described core (1) is made up of steel wire wire and aluminum conductor, and described steel wire wire is located at the center of core (1), and steel wire wire is twisted into, with aluminum conductor, the core (1) that steel-cored aluminium strand structure is formed jointly.The core that it adopts is made up of steel wire wire and aluminum conductor, and described steel wire wire is located at the center of core, and steel wire wire is twisted into, with aluminum conductor, the core that steel-cored aluminium strand structure is formed jointly.Copper be substituted for by aluminum, not only save cost, and electric conductivity is also fully consistent with standard, and steel wire therein twists the blend of aluminum, solves the problems, such as that aluminum conductor tensile strength is not enough again.

However, applicant, is mainly manifested in it is believed that seabed of the prior art high tension cable also has the improved space of structure after repetition test（1）Armor amount of redundancy is excessive, mainly tensile strength aspect, primary concern is that the rounding of cable in prior art, and therefore, the reinforcement that armor adopts, far beyond the tensile strength of demand, causes the waste of resource；（2）The anti-wear performance of external protection, water-impervious, anti-sea water performance are to be improved；（3）Screen layer can be improved further with the set-up mode of insulating barrier, preferably to improve cable performance；（4）The material of insulating barrier needs to be researched and developed further so as to higher stress levels or performance can be reached.

Content of the invention

In order to solve the above problems, the purpose of the present invention is to disclose seabed high tension cable and its manufacture method, and they employ the following technical solutions to realize.

In first embodiment of the present invention, seabed high tension cable is it is characterised in that it is to be made up of the conductive unit 1 setting gradually from inside to outside, metal screen layer 2, water blocking layer 3, inner sheath 5, armor, oversheath 8, oversheath protective layer 9；Described conductive unit 1 be coated on outside conductor by conductor 11, extrusion molding insulating barrier 12, be located at insulation screen 13 outside insulating barrier, the conductor sheath 14 outside extrusion molding is coated on insulation screen is constituted, on arbitrary cross section, the center of circle of conductor is coincided with the center of circle of insulating barrier, and the diameter of insulating barrier is 1.5～5 times of conductor diameter and thickness of insulating layer minima is 1.5mm；Described armor is made up of gasket for packing 6, reinforcement 7, reinforcement 7 is by stiffener 71, the plastic layer 72 that is coated on outside stiffener is constituted, gasket for packing is constituted gasket for packing group with three for one group, reinforcement is constituted reinforcement group with three for one group, gasket for packing group and reinforcement group are alternately distributed outside inner sheath, and gasket for packing group is all close to inner sheath with reinforcement group；The material of described oversheath protective layer is polyamide；The material of described insulating barrier is organosilane crosslinked polyethylene or by weight, is made up of following raw material：High density polyethylene (HDPE)：70～85 parts, ethylene-vinyl acetate copolymer：10～20 parts, ethylene-tetrafluoroethylene copolymer：8～16 parts, magnesium hydroxide：10～15 parts, antioxidant 1010：3～5 parts, strontium titanates：2～4 parts, calcium titanate：2～4 parts, bismuth titanates：2～4 parts, magnesium titanate：2～4 parts, silicon dioxide：3～5 parts, zirconium dioxide：3～5 parts.

In second embodiment of the present invention; seabed high tension cable; it is characterized in that it is to be made up of the metal screen layer 2 setting gradually from inside to outside, water blocking layer 3, tack coat 4, inner sheath 5, armor, oversheath 8, oversheath protective layer 9; there is inside metal screen layer the conductive unit 1 of three two biphase circumscribed settings, three conductive units and metal screen layer phase inscribe；Described conductive unit 1 be coated on outside conductor by conductor 11, extrusion molding insulating barrier 12, be located at insulation screen 13 outside insulating barrier, the conductor sheath 14 outside extrusion molding is coated on insulation screen is constituted, on arbitrary cross section, the center of circle of conductor is coincided with the center of circle of insulating barrier, and the diameter of insulating barrier is 1.5～5 times of conductor diameter and thickness of insulating layer minima is 1.5mm；Described armor is made up of gasket for packing 6, reinforcement 7, reinforcement 7 is by stiffener 71, the plastic layer 72 that is coated on outside stiffener is constituted, gasket for packing is constituted gasket for packing group with two for one group, gasket for packing group and reinforcement are alternately distributed outside inner sheath, and gasket for packing group is all close to inner sheath with reinforcement；The material of described oversheath protective layer is polyamide；The material of described insulating barrier is organosilane crosslinked polyethylene or by weight, is made up of following raw material：High density polyethylene (HDPE)：70～85 parts, ethylene-vinyl acetate copolymer：10～20 parts, ethylene-tetrafluoroethylene copolymer：8～16 parts, magnesium hydroxide：10～15 parts, antioxidant 1010：3～5 parts, strontium titanates：2～4 parts, calcium titanate：2～4 parts, bismuth titanates：2～4 parts, magnesium titanate：2～4 parts, silicon dioxide：3～5 parts, zirconium dioxide：3～5 parts.

In 3rd embodiment of the present invention, seabed high tension cable, it is characterized in that it is to be made up of the metal screen layer 2 setting gradually from inside to outside, water blocking layer 3, tack coat 4, inner sheath 5, armor, oversheath 8, there is inside metal screen layer the conductive unit 1 of three two biphase circumscribed settings, three conductive units and metal screen layer phase inscribe；Described conductive unit 1 be coated on outside conductor by conductor 11, extrusion molding insulating barrier 12, be located at insulation screen 13 outside insulating barrier, the conductor sheath 14 outside extrusion molding is coated on insulation screen is constituted, on arbitrary cross section, the center of circle of conductor is coincided with the center of circle of insulating barrier, and the diameter of insulating barrier is 1.5～5 times of conductor diameter and thickness of insulating layer minima is 1.5mm；Described armor is made up of gasket for packing 6, reinforcement 7, and reinforcement 7 is by stiffener 71, the plastic layer 72 that is coated on outside stiffener is constituted, and gasket for packing and reinforcement are alternately distributed outside inner sheath, and gasket for packing is all close to inner sheath with reinforcement；The material of described insulating barrier is organosilane crosslinked polyethylene or by weight, is made up of following raw material：High density polyethylene (HDPE)：70～85 parts, ethylene-vinyl acetate copolymer：10～20 parts, ethylene-tetrafluoroethylene copolymer：8～16 parts, magnesium hydroxide：10～15 parts, antioxidant 1010：3～5 parts, strontium titanates：2～4 parts, calcium titanate：2～4 parts, bismuth titanates：2～4 parts, magnesium titanate：2～4 parts, silicon dioxide：3～5 parts, zirconium dioxide：3～5 parts.

In 4th embodiment of the present invention, seabed high tension cable, it is characterized in that it is to be made up of the metal screen layer 2 setting gradually from inside to outside, water blocking layer 3, tack coat 4, inner sheath 5, armor, oversheath 8, there is inside metal screen layer the conductive unit 1 of three two biphase circumscribed settings, three conductive units and metal screen layer phase inscribe；Described conductive unit 1 be coated on outside conductor by conductor 11, extrusion molding insulating barrier 12, be located at insulation screen 13 outside insulating barrier, the conductor sheath 14 outside extrusion molding is coated on insulation screen is constituted, on arbitrary cross section, the center of circle of conductor is coincided with the center of circle of insulating barrier, and the diameter of insulating barrier is 1.5～5 times of conductor diameter and thickness of insulating layer minima is 1.5mm；Described armor is made up of gasket for packing 6, reinforcement 7, reinforcement 7 is by stiffener 71, the plastic layer 72 that is coated on outside stiffener is constituted, gasket for packing is constituted gasket for packing group with two for one group, gasket for packing group and reinforcement are alternately distributed outside inner sheath, and gasket for packing group is all close to inner sheath with reinforcement；The material of described insulating barrier is organosilane crosslinked polyethylene or by weight, is made up of following raw material：High density polyethylene (HDPE)：70～85 parts, ethylene-vinyl acetate copolymer：10～20 parts, ethylene-tetrafluoroethylene copolymer：8～16 parts, magnesium hydroxide：10～15 parts, antioxidant 1010：3～5 parts, strontium titanates：2～4 parts, calcium titanate：2～4 parts, bismuth titanates：2～4 parts, magnesium titanate：2～4 parts, silicon dioxide：3～5 parts, zirconium dioxide：3～5 parts.

Seabed high tension cable in the present invention first embodiment, it by the following method step be fabricated by：

The first step：The step manufacturing conductive unit：Many copper wires or aluminium wire or many copper wires are first taken to carry out stranded, the conductor of sectional area needed for formation with multiple aluminium wire；Take organosilane crosslinked polyethylene or by weight again, be made up of following raw material：High density polyethylene (HDPE)：70～85 parts, ethylene-vinyl acetate copolymer：10～20 parts, ethylene-tetrafluoroethylene copolymer：8～16 parts, magnesium hydroxide：10～15 parts, antioxidant 1010：3～5 parts, strontium titanates：2～4 parts, calcium titanate：2～4 parts, bismuth titanates：2～4 parts, magnesium titanate：2～4 parts, silicon dioxide：3～5 parts, zirconium dioxide：3～5 parts；Put in insulating barrier extruding machine, in the outer plastic extruding insulated layer of conductor, so that the center of circle of conductor is coincided with the center of circle of insulating barrier, and the diameter of insulating barrier is 1.5～5 times of conductor diameter and thickness of insulating layer minima is 1.5mm；Then form insulation screen outside conductive plasticss extrusion molding being coated on insulating barrier；Then form conductor sheath outside high density polyethylene (HDPE) or medium density polyethylene or polrvinyl chloride or Low Density Polyethylene extrusion molding being coated on insulation screen；

Second step：The step manufacturing metal screen layer：The mode that steel band or aluminium strip or copper strips are in the way of longitudinally coating or spiral is wrapped is taken to coat outside the conductive unit being formed in the first step；When longitudinally coating, there is overlapping overlap joint, lap width is 2～5mm, lap-joint is bondd with PUR, the peel strength minima between lap-joint's steel band or between aluminium strip or between copper strips is 1.6N/mm；When spiral is wrapped, there is between spiral overlapping overlap joint in front and back, lap width is 1～3mm；

3rd step：The step forming water blocking layer：Take that water blocking layer is waterstop or non-woven fabrics or polyester band or aluminium-plastic tape is longitudinally coated on outside the metal screen layer manufacturing in second step, form water blocking layer；

4th step：The step manufacturing inner sheath：Take and form inner sheath outside the water blocking layer that polyethylene or polrvinyl chloride extrusion molding cladding manufacture in the third step；

5th step：The step manufacturing armor：Take outside the inner sheath that pre-manufactured gasket for packing and reinforcement helical coated manufacture in the 4th step, wherein reinforcement by stiffener, the plastic layer that is coated on outside stiffener constitutes, gasket for packing is constituted gasket for packing group with three for one group, reinforcement is constituted reinforcement group with three for one group, gasket for packing group and reinforcement group are alternately distributed outside inner sheath, and gasket for packing group is all close to inner sheath with reinforcement group；The material of stiffener is steel wire or fiberglass reinforced plastics or aramid yarn；The material of plastic layer is polypropylene or linear low density polyethylene or Low Density Polyethylene or high density polyethylene (HDPE)；The diameter of gasket for packing is equal with the diameter of reinforcement；

6th step：The step manufacturing oversheath：By oversheath extruding machine, high density polyethylene (HDPE) or medium density polyethylene extrusion molding are coated on outside the armor that the 5th step is formed, form oversheath；

7th step：The step manufacturing oversheath protective layer：Take polyamide and its extrusion molding is coated on outside the oversheath manufacture in the 6th step, form seabed high tension cable finished product, the thickness of described oversheath protective layer is 1.0～2.0mm.

Seabed high tension cable in the present invention second embodiment, it by the following method step be fabricated by：

The first step：The step manufacturing conductive unit：Many copper wires or aluminium wire or many copper wires are first taken to carry out stranded, the conductor of sectional area needed for formation with multiple aluminium wire；Take organosilane crosslinked polyethylene or by weight again, be made up of following raw material：High density polyethylene (HDPE)：70～85 parts, ethylene-vinyl acetate copolymer：10～20 parts, ethylene-tetrafluoroethylene copolymer：8～16 parts, magnesium hydroxide：10～15 parts, antioxidant 1010：3～5 parts, strontium titanates：2～4 parts, calcium titanate：2～4 parts, bismuth titanates：2～4 parts, magnesium titanate：2～4 parts, silicon dioxide：3～5 parts, zirconium dioxide：3～5 parts；Put in insulating barrier extruding machine, in the outer plastic extruding insulated layer of conductor, so that the center of circle of conductor is coincided with the center of circle of insulating barrier, and the diameter of insulating barrier is 1.5～5 times of conductor diameter and thickness of insulating layer minima is 1.5mm；Then form insulation screen outside conductive plasticss extrusion molding being coated on insulating barrier；Then form conductor sheath outside high density polyethylene (HDPE) or medium density polyethylene or polrvinyl chloride or Low Density Polyethylene extrusion molding being coated on insulation screen；Above-mentioned steps repeatedly, until form three conductive units；

Second step：The step manufacturing metal screen layer：Take manufacture in the first step three conductive units two biphase circumscribedly stranded or be placed in parallel, conductive unit intertwist body；The mode that steel band or aluminium strip or copper strips are in the way of longitudinally coating or spiral is wrapped is taken to be close to coat outside the conductive unit intertwist body being formed in the first step again；When longitudinally coating, there is overlapping overlap joint, lap width is 2～5mm, lap-joint is bondd with PUR, the peel strength minima between lap-joint's steel band or between aluminium strip or between copper strips is 1.6N/mm；When spiral is wrapped, there is between spiral overlapping overlap joint in front and back, lap width is 1～3mm；

3rd step：The step forming water blocking layer and tack coat：Take that water blocking layer is waterstop or non-woven fabrics or polyester band or aluminium-plastic tape is longitudinally coated on outside the metal screen layer manufacturing in second step, form water blocking layer；Take polypropylene extrusion molding to be coated on outside water blocking layer and form tack coat；

4th step：The step manufacturing inner sheath：Take and form inner sheath outside the tack coat that polyethylene or polrvinyl chloride extrusion molding cladding manufacture in the third step；

5th step：The step manufacturing armor：Take outside the inner sheath that pre-manufactured gasket for packing and reinforcement helical coated manufacture in the 4th step, wherein reinforcement by stiffener, the plastic layer that is coated on outside stiffener constitutes, gasket for packing is constituted gasket for packing group with two for one group, gasket for packing group and reinforcement are alternately distributed outside inner sheath, and gasket for packing group is all close to inner sheath with reinforcement；The material of stiffener is steel wire or fiberglass reinforced plastics or aramid yarn；The material of plastic layer is polypropylene or linear low density polyethylene or Low Density Polyethylene or high density polyethylene (HDPE)；The diameter of gasket for packing is equal with the diameter of reinforcement；

6th step：The step manufacturing oversheath：By oversheath extruding machine, high density polyethylene (HDPE) or medium density polyethylene extrusion molding are coated on outside the armor that the 5th step is formed, form oversheath；

7th step：The step manufacturing oversheath protective layer：Take polyamide and its extrusion molding is coated on outside the oversheath manufacture in the 6th step, form seabed high tension cable finished product, the thickness of described oversheath protective layer is 1.0～2.0mm.

Seabed high tension cable in the present invention the 3rd embodiment, it by the following method step be fabricated by：

The first step：The step manufacturing conductive unit：Many copper wires or aluminium wire or many copper wires are first taken to carry out stranded, the conductor of sectional area needed for formation with multiple aluminium wire；Take organosilane crosslinked polyethylene or by weight again, be made up of following raw material：High density polyethylene (HDPE)：70～85 parts, ethylene-vinyl acetate copolymer：10～20 parts, ethylene-tetrafluoroethylene copolymer：8～16 parts, magnesium hydroxide：10～15 parts, antioxidant 1010：3～5 parts, strontium titanates：2～4 parts, calcium titanate：2～4 parts, bismuth titanates：2～4 parts, magnesium titanate：2～4 parts, silicon dioxide：3～5 parts, zirconium dioxide：3～5 parts；Put in insulating barrier extruding machine, in the outer plastic extruding insulated layer of conductor, so that the center of circle of conductor is coincided with the center of circle of insulating barrier, and the diameter of insulating barrier is 1.5～5 times of conductor diameter and thickness of insulating layer minima is 1.5mm；Then form insulation screen outside conductive plasticss extrusion molding being coated on insulating barrier；Then form conductor sheath outside high density polyethylene (HDPE) or medium density polyethylene or polrvinyl chloride or Low Density Polyethylene extrusion molding being coated on insulation screen；Above-mentioned steps repeatedly, until form three conductive units；

Second step：The step manufacturing metal screen layer：Take manufacture in the first step three conductive units two biphase circumscribedly stranded or be placed in parallel, conductive unit intertwist body；The mode that steel band or aluminium strip or copper strips are in the way of longitudinally coating or spiral is wrapped is taken to be close to coat outside the conductive unit intertwist body being formed in the first step again；When longitudinally coating, there is overlapping overlap joint, lap width is 2～5mm, lap-joint is bondd with PUR, the peel strength minima between lap-joint's steel band or between aluminium strip or between copper strips is 1.6N/mm；When spiral is wrapped, there is between spiral overlapping overlap joint in front and back, lap width is 1～3mm；

3rd step：The step forming water blocking layer and tack coat：Take that water blocking layer is waterstop or non-woven fabrics or polyester band or aluminium-plastic tape is longitudinally coated on outside the metal screen layer manufacturing in second step, form water blocking layer；Take polypropylene extrusion molding to be coated on outside water blocking layer and form tack coat；

4th step：The step manufacturing inner sheath：Take and form inner sheath outside the tack coat that polyethylene or polrvinyl chloride extrusion molding cladding manufacture in the third step；

5th step：The step manufacturing armor：Take outside the inner sheath that pre-manufactured gasket for packing and reinforcement helical coated manufacture in the 4th step, wherein reinforcement by stiffener, the plastic layer that is coated on outside stiffener constitutes, gasket for packing and reinforcement are alternately distributed outside inner sheath, and gasket for packing is all close to inner sheath with reinforcement；The material of stiffener is steel wire or fiberglass reinforced plastics or aramid yarn；The material of plastic layer is polypropylene or linear low density polyethylene or Low Density Polyethylene or high density polyethylene (HDPE)；The diameter of gasket for packing is equal with the diameter of reinforcement；

6th step：The step manufacturing oversheath：By oversheath extruding machine, high density polyethylene (HDPE) or medium density polyethylene extrusion molding are coated on outside the armor that the 5th step is formed, form oversheath；Complete the manufacture of seabed high tension cable finished product.

Seabed high tension cable in the present invention the 4th embodiment, it by the following method step be fabricated by：

The first step：The step manufacturing conductive unit：Many copper wires or aluminium wire or many copper wires are first taken to carry out stranded, the conductor of sectional area needed for formation with multiple aluminium wire；Take organosilane crosslinked polyethylene or by weight again, be made up of following raw material：High density polyethylene (HDPE)：70～85 parts, ethylene-vinyl acetate copolymer：10～20 parts, ethylene-tetrafluoroethylene copolymer：8～16 parts, magnesium hydroxide：10～15 parts, antioxidant 1010：3～5 parts, strontium titanates：2～4 parts, calcium titanate：2～4 parts, bismuth titanates：2～4 parts, magnesium titanate：2～4 parts, silicon dioxide：3～5 parts, zirconium dioxide：3～5 parts；Put in insulating barrier extruding machine, in the outer plastic extruding insulated layer of conductor, so that the center of circle of conductor is coincided with the center of circle of insulating barrier, and the diameter of insulating barrier is 1.5～5 times of conductor diameter and thickness of insulating layer minima is 1.5mm；Then form insulation screen outside conductive plasticss extrusion molding being coated on insulating barrier；Then form conductor sheath outside high density polyethylene (HDPE) or medium density polyethylene or polrvinyl chloride or Low Density Polyethylene extrusion molding being coated on insulation screen；Above-mentioned steps repeatedly, until form three conductive units；

Second step：The step manufacturing metal screen layer：Take manufacture in the first step three conductive units two biphase circumscribedly stranded or be placed in parallel, conductive unit intertwist body；The mode that steel band or aluminium strip or copper strips are in the way of longitudinally coating or spiral is wrapped is taken to be close to coat outside the conductive unit intertwist body being formed in the first step again；When longitudinally coating, there is overlapping overlap joint, lap width is 2～5mm, lap-joint is bondd with PUR, the peel strength minima between lap-joint's steel band or between aluminium strip or between copper strips is 1.6N/mm；When spiral is wrapped, there is between spiral overlapping overlap joint in front and back, lap width is 1～3mm；

3rd step：The step forming water blocking layer and tack coat：Take that water blocking layer is waterstop or non-woven fabrics or polyester band or aluminium-plastic tape is longitudinally coated on outside the metal screen layer manufacturing in second step, form water blocking layer；Take polypropylene extrusion molding to be coated on outside water blocking layer and form tack coat；

4th step：The step manufacturing inner sheath：Take and form inner sheath outside the tack coat that polyethylene or polrvinyl chloride extrusion molding cladding manufacture in the third step；

5th step：The step manufacturing armor：Take outside the inner sheath that pre-manufactured gasket for packing and reinforcement helical coated manufacture in the 4th step, wherein reinforcement by stiffener, the plastic layer that is coated on outside stiffener constitutes, gasket for packing is constituted gasket for packing group with two for one group, gasket for packing group and reinforcement are alternately distributed outside inner sheath, and gasket for packing group is all close to inner sheath with reinforcement；The material of stiffener is steel wire or fiberglass reinforced plastics or aramid yarn；The material of plastic layer is polypropylene or linear low density polyethylene or Low Density Polyethylene or high density polyethylene (HDPE)；The diameter of gasket for packing is equal with the diameter of reinforcement；

6th step：The step manufacturing oversheath：By oversheath extruding machine, high density polyethylene (HDPE) or medium density polyethylene extrusion molding are coated on outside the armor that the 5th step is formed, form oversheath；Complete the manufacture of seabed high tension cable finished product.

In the present invention, due to reinforcement by stiffener, the plastic layer that is coated on outside stiffener constitutes, therefore, the size of stiffener can carry out appropriate design according to mechanical property requirements, and its outside plastic layer achieves tangent, rounding technology, i.e. armor amount of redundancy can be transferred to properly, and cooperation gasket for packing can be ordered and so that resource is more saved.

In the present invention, oversheath and presumable oversheath protective layer, make product be provided with the anti-wear performance more excellent than prior art, water-impervious, anti-sea water performance.

In the present invention, screen layer is different with of the prior art from the set-up mode of insulating barrier, and in prior art, screen layer is close to conductor, the effect of shielding actually difficult to realize；Therefore, so that the shielding propertiess of cable is substantially improved in the present invention, not only achieve the exclusion of external disturbance, considerably reduce the external impact of conductor itself radiation simultaneously.

In the present invention, due to employing special insulating layer material, and its suitable thickness proportion and concentricity, the insulating properties making cable greatly increase, and through test, the present invention is used for the electric power of transmission 500～1000KV, 1000 meters, 30,000 hours, any punch-through is not had to occur.

The cable making method of the present invention is simple, easily grasp, can be produced using the production equipment that cable production firm commonly uses, therefore, equipment investment is few, more economically practical, makes utilization rate of equipment and installations higher.

Therefore, the present invention has following main beneficial effect：Cable machinery performance redundancy amount is more suitable, resource is more saved, more resistant performance, more can water-impervious, more anti-sea water, shielding propertiess more preferably, more can transmit high voltage.

Brief description

Fig. 1 is the perspective view after one section of stripping of embodiment 1 of the present invention.

Fig. 2 is the cross-sectional structure schematic diagram after Fig. 1 amplification.

Fig. 3 is the perspective view after one section of stripping of embodiment 2 of the present invention.

Fig. 4 is the cross-sectional structure schematic diagram after Fig. 3 amplification.

Fig. 5 is the perspective view after one section of stripping of embodiment 3 of the present invention.

Fig. 6 is the cross-sectional structure schematic diagram after Fig. 5 amplification.

Fig. 7 is the perspective view after one section of stripping of embodiment 4 of the present invention.

Fig. 8 is the cross-sectional structure schematic diagram after Fig. 7 amplification.

Specific embodiment

Embodiment 1

Ask for an interview Fig. 1 and Fig. 2, seabed high tension cable is it is characterised in that it is to be made up of the conductive unit 1 setting gradually from inside to outside, metal screen layer 2, water blocking layer 3, inner sheath 5, armor, oversheath 8, oversheath protective layer 9；Described conductive unit 1 be coated on outside conductor by conductor 11, extrusion molding insulating barrier 12, be located at insulation screen 13 outside insulating barrier, the conductor sheath 14 outside extrusion molding is coated on insulation screen is constituted, on arbitrary cross section, the center of circle of conductor is coincided with the center of circle of insulating barrier, and the diameter of insulating barrier is 1.5～5 times of conductor diameter and thickness of insulating layer minima is 1.5mm；Described armor is made up of gasket for packing 6, reinforcement 7, reinforcement 7 is by stiffener 71, the plastic layer 72 that is coated on outside stiffener is constituted, gasket for packing is constituted gasket for packing group with three for one group, reinforcement is constituted reinforcement group with three for one group, gasket for packing group and reinforcement group are alternately distributed outside inner sheath, and gasket for packing group is all close to inner sheath with reinforcement group；The material of described oversheath protective layer is polyamide；The material of described insulating barrier is organosilane crosslinked polyethylene or by weight, is made up of following raw material：High density polyethylene (HDPE)：70～85 parts, ethylene-vinyl acetate copolymer：10～20 parts, ethylene-tetrafluoroethylene copolymer：8～16 parts, magnesium hydroxide：10～15 parts, antioxidant 1010：3～5 parts, strontium titanates：2～4 parts, calcium titanate：2～4 parts, bismuth titanates：2～4 parts, magnesium titanate：2～4 parts, silicon dioxide：3～5 parts, zirconium dioxide：3～5 parts.

Seabed high tension cable described above, it is characterised in that the material of described metal screen layer is steel band or aluminium strip or copper strips, is in the way of longitudinally coating or the wrapped mode of spiral is coated on outside conductive unit；When longitudinally coating, there is overlapping overlap joint, lap width is 2～5mm, lap-joint is bondd with PUR, the peel strength minima between lap-joint's steel band or between aluminium strip or between copper strips is 1.6N/mm；When spiral is wrapped, there is between spiral overlapping overlap joint in front and back, lap width is 1～3mm.

Embodiment 2

Ask for an interview Fig. 3 and Fig. 4; seabed high tension cable; it is characterized in that it is to be made up of the metal screen layer 2 setting gradually from inside to outside, water blocking layer 3, tack coat 4, inner sheath 5, armor, oversheath 8, oversheath protective layer 9; there is inside metal screen layer the conductive unit 1 of three two biphase circumscribed settings, three conductive units and metal screen layer phase inscribe；Described conductive unit 1 be coated on outside conductor by conductor 11, extrusion molding insulating barrier 12, be located at insulation screen 13 outside insulating barrier, the conductor sheath 14 outside extrusion molding is coated on insulation screen is constituted, on arbitrary cross section, the center of circle of conductor is coincided with the center of circle of insulating barrier, and the diameter of insulating barrier is 1.5～5 times of conductor diameter and thickness of insulating layer minima is 1.5mm；Described armor is made up of gasket for packing 6, reinforcement 7, reinforcement 7 is by stiffener 71, the plastic layer 72 that is coated on outside stiffener is constituted, gasket for packing is constituted gasket for packing group with two for one group, gasket for packing group and reinforcement are alternately distributed outside inner sheath, and gasket for packing group is all close to inner sheath with reinforcement；The material of described oversheath protective layer is polyamide；The material of described insulating barrier is organosilane crosslinked polyethylene or by weight, is made up of following raw material：High density polyethylene (HDPE)：70～85 parts, ethylene-vinyl acetate copolymer：10～20 parts, ethylene-tetrafluoroethylene copolymer：8～16 parts, magnesium hydroxide：10～15 parts, antioxidant 1010：3～5 parts, strontium titanates：2～4 parts, calcium titanate：2～4 parts, bismuth titanates：2～4 parts, magnesium titanate：2～4 parts, silicon dioxide：3～5 parts, zirconium dioxide：3～5 parts.

Embodiment 3

Ask for an interview Fig. 5 and Fig. 6, seabed high tension cable, it is characterized in that it is to be made up of the metal screen layer 2 setting gradually from inside to outside, water blocking layer 3, tack coat 4, inner sheath 5, armor, oversheath 8, there is inside metal screen layer the conductive unit 1 of three two biphase circumscribed settings, three conductive units and metal screen layer phase inscribe；Described conductive unit 1 be coated on outside conductor by conductor 11, extrusion molding insulating barrier 12, be located at insulation screen 13 outside insulating barrier, the conductor sheath 14 outside extrusion molding is coated on insulation screen is constituted, on arbitrary cross section, the center of circle of conductor is coincided with the center of circle of insulating barrier, and the diameter of insulating barrier is 1.5～5 times of conductor diameter and thickness of insulating layer minima is 1.5mm；Described armor is made up of gasket for packing 6, reinforcement 7, and reinforcement 7 is by stiffener 71, the plastic layer 72 that is coated on outside stiffener is constituted, and gasket for packing and reinforcement are alternately distributed outside inner sheath, and gasket for packing is all close to inner sheath with reinforcement；The material of described insulating barrier is organosilane crosslinked polyethylene or by weight, is made up of following raw material：High density polyethylene (HDPE)：70～85 parts, ethylene-vinyl acetate copolymer：10～20 parts, ethylene-tetrafluoroethylene copolymer：8～16 parts, magnesium hydroxide：10～15 parts, antioxidant 1010：3～5 parts, strontium titanates：2～4 parts, calcium titanate：2～4 parts, bismuth titanates：2～4 parts, magnesium titanate：2～4 parts, silicon dioxide：3～5 parts, zirconium dioxide：3～5 parts.

Embodiment 4

Ask for an interview Fig. 7 and Fig. 8, seabed high tension cable, it is characterized in that it is to be made up of the metal screen layer 2 setting gradually from inside to outside, water blocking layer 3, tack coat 4, inner sheath 5, armor, oversheath 8, there is inside metal screen layer the conductive unit 1 of three two biphase circumscribed settings, three conductive units and metal screen layer phase inscribe；Described conductive unit 1 be coated on outside conductor by conductor 11, extrusion molding insulating barrier 12, be located at insulation screen 13 outside insulating barrier, the conductor sheath 14 outside extrusion molding is coated on insulation screen is constituted, on arbitrary cross section, the center of circle of conductor is coincided with the center of circle of insulating barrier, and the diameter of insulating barrier is 1.5～5 times of conductor diameter and thickness of insulating layer minima is 1.5mm；Described armor is made up of gasket for packing 6, reinforcement 7, reinforcement 7 is by stiffener 71, the plastic layer 72 that is coated on outside stiffener is constituted, gasket for packing is constituted gasket for packing group with two for one group, gasket for packing group and reinforcement are alternately distributed outside inner sheath, and gasket for packing group is all close to inner sheath with reinforcement；The material of described insulating barrier is organosilane crosslinked polyethylene or by weight, is made up of following raw material：High density polyethylene (HDPE)：70～85 parts, ethylene-vinyl acetate copolymer：10～20 parts, ethylene-tetrafluoroethylene copolymer：8～16 parts, magnesium hydroxide：10～15 parts, antioxidant 1010：3～5 parts, strontium titanates：2～4 parts, calcium titanate：2～4 parts, bismuth titanates：2～4 parts, magnesium titanate：2～4 parts, silicon dioxide：3～5 parts, zirconium dioxide：3～5 parts.

Seabed high tension cable described in arbitrary embodiment in above-mentioned embodiment 2-4, it is characterized in that the material of described metal screen layer is steel band or aluminium strip or copper strips, it is in the way of longitudinally coating or the wrapped mode of spiral is coated on the overall outside of three conductive units；When longitudinally coating, there is overlapping overlap joint, lap width is 2～5mm, lap-joint is bondd with PUR, the peel strength minima between lap-joint's steel band or between aluminium strip or between copper strips is 1.6N/mm；When spiral is wrapped, there is between spiral overlapping overlap joint in front and back, lap width is 1～3mm.

Seabed high tension cable described in arbitrary embodiment in above-mentioned embodiment 2-4 is it is characterised in that the material of described tack coat is polypropylene.

Seabed high tension cable described in any of the above-described embodiment is it is characterised in that described water blocking layer is waterstop or non-woven fabrics or polyester band or aluminium-plastic tape.

Seabed high tension cable described in any of the above-described embodiment is it is characterised in that described insulation screen is conductive plasticss.

Seabed high tension cable described in any of the above-described embodiment is it is characterised in that the material of described protective cover of conductor is high density polyethylene (HDPE) or medium density polyethylene or polrvinyl chloride or Low Density Polyethylene.

Seabed high tension cable described in any of the above-described embodiment is it is characterised in that the material of main part of described inner sheath is polyethylene or polrvinyl chloride.

Seabed high tension cable described in any of the above-described embodiment is it is characterised in that the material of described oversheath is high density polyethylene (HDPE) or medium density polyethylene.

Seabed high tension cable described in any of the above-described embodiment is it is characterised in that the material of described gasket for packing is polypropylene or linear low density polyethylene or Low Density Polyethylene.

Seabed high tension cable described in any of the above-described embodiment is it is characterised in that the material of described stiffener is steel wire or fiberglass reinforced plastics or aramid yarn.

Seabed high tension cable described in any of the above-described embodiment is it is characterised in that the material of described plastic layer is polypropylene or linear low density polyethylene or Low Density Polyethylene or high density polyethylene (HDPE).

Seabed high tension cable in embodiment 1 of the present invention, it by the following method step be fabricated by：

The first step：The step manufacturing conductive unit：Many copper wires or aluminium wire or many copper wires are first taken to carry out stranded, the conductor of sectional area needed for formation with multiple aluminium wire；Take organosilane crosslinked polyethylene or by weight again, be made up of following raw material：High density polyethylene (HDPE)：70～85 parts, ethylene-vinyl acetate copolymer：10～20 parts, ethylene-tetrafluoroethylene copolymer：8～16 parts, magnesium hydroxide：10～15 parts, antioxidant 1010：3～5 parts, strontium titanates：2～4 parts, calcium titanate：2～4 parts, bismuth titanates：2～4 parts, magnesium titanate：2～4 parts, silicon dioxide：3～5 parts, zirconium dioxide：3～5 parts；Put in insulating barrier extruding machine, in the outer plastic extruding insulated layer of conductor, so that the center of circle of conductor is coincided with the center of circle of insulating barrier, and the diameter of insulating barrier is 1.5～5 times of conductor diameter and thickness of insulating layer minima is 1.5mm；Then form insulation screen outside conductive plasticss extrusion molding being coated on insulating barrier；Then form conductor sheath outside high density polyethylene (HDPE) or medium density polyethylene or polrvinyl chloride or Low Density Polyethylene extrusion molding being coated on insulation screen；

Second step：The step manufacturing metal screen layer：The mode that steel band or aluminium strip or copper strips are in the way of longitudinally coating or spiral is wrapped is taken to coat outside the conductive unit being formed in the first step；When longitudinally coating, there is overlapping overlap joint, lap width is 2～5mm, lap-joint is bondd with PUR, the peel strength minima between lap-joint's steel band or between aluminium strip or between copper strips is 1.6N/mm；When spiral is wrapped, there is between spiral overlapping overlap joint in front and back, lap width is 1～3mm；

3rd step：The step forming water blocking layer：Take that water blocking layer is waterstop or non-woven fabrics or polyester band or aluminium-plastic tape is longitudinally coated on outside the metal screen layer manufacturing in second step, form water blocking layer；

4th step：The step manufacturing inner sheath：Take and form inner sheath outside the water blocking layer that polyethylene or polrvinyl chloride extrusion molding cladding manufacture in the third step；

5th step：The step manufacturing armor：Take outside the inner sheath that pre-manufactured gasket for packing and reinforcement helical coated manufacture in the 4th step, wherein reinforcement by stiffener, the plastic layer that is coated on outside stiffener constitutes, gasket for packing is constituted gasket for packing group with three for one group, reinforcement is constituted reinforcement group with three for one group, gasket for packing group and reinforcement group are alternately distributed outside inner sheath, and gasket for packing group is all close to inner sheath with reinforcement group；The material of stiffener is steel wire or fiberglass reinforced plastics or aramid yarn；The material of plastic layer is polypropylene or linear low density polyethylene or Low Density Polyethylene or high density polyethylene (HDPE)；The diameter of gasket for packing is equal with the diameter of reinforcement；

6th step：The step manufacturing oversheath：By oversheath extruding machine, high density polyethylene (HDPE) or medium density polyethylene extrusion molding are coated on outside the armor that the 5th step is formed, form oversheath；

7th step：The step manufacturing oversheath protective layer：Take polyamide and its extrusion molding is coated on outside the oversheath manufacture in the 6th step, form seabed high tension cable finished product, the thickness of described oversheath protective layer is 1.0～2.0mm.

Seabed high tension cable in embodiment 2 of the present invention, it by the following method step be fabricated by：

The first step：The step manufacturing conductive unit：Many copper wires or aluminium wire or many copper wires are first taken to carry out stranded, the conductor of sectional area needed for formation with multiple aluminium wire；Take organosilane crosslinked polyethylene or by weight again, be made up of following raw material：High density polyethylene (HDPE)：70～85 parts, ethylene-vinyl acetate copolymer：10～20 parts, ethylene-tetrafluoroethylene copolymer：8～16 parts, magnesium hydroxide：10～15 parts, antioxidant 1010：3～5 parts, strontium titanates：2～4 parts, calcium titanate：2～4 parts, bismuth titanates：2～4 parts, magnesium titanate：2～4 parts, silicon dioxide：3～5 parts, zirconium dioxide：3～5 parts；Put in insulating barrier extruding machine, in the outer plastic extruding insulated layer of conductor, so that the center of circle of conductor is coincided with the center of circle of insulating barrier, and the diameter of insulating barrier is 1.5～5 times of conductor diameter and thickness of insulating layer minima is 1.5mm；Then form insulation screen outside conductive plasticss extrusion molding being coated on insulating barrier；Then form conductor sheath outside high density polyethylene (HDPE) or medium density polyethylene or polrvinyl chloride or Low Density Polyethylene extrusion molding being coated on insulation screen；Above-mentioned steps repeatedly, until form three conductive units；

Second step：The step manufacturing metal screen layer：Take manufacture in the first step three conductive units two biphase circumscribedly stranded or be placed in parallel, conductive unit intertwist body；The mode that steel band or aluminium strip or copper strips are in the way of longitudinally coating or spiral is wrapped is taken to be close to coat outside the conductive unit intertwist body being formed in the first step again；When longitudinally coating, there is overlapping overlap joint, lap width is 2～5mm, lap-joint is bondd with PUR, the peel strength minima between lap-joint's steel band or between aluminium strip or between copper strips is 1.6N/mm；When spiral is wrapped, there is between spiral overlapping overlap joint in front and back, lap width is 1～3mm；

3rd step：The step forming water blocking layer and tack coat：Take that water blocking layer is waterstop or non-woven fabrics or polyester band or aluminium-plastic tape is longitudinally coated on outside the metal screen layer manufacturing in second step, form water blocking layer；Take polypropylene extrusion molding to be coated on outside water blocking layer and form tack coat；

4th step：The step manufacturing inner sheath：Take and form inner sheath outside the tack coat that polyethylene or polrvinyl chloride extrusion molding cladding manufacture in the third step；

5th step：The step manufacturing armor：Take outside the inner sheath that pre-manufactured gasket for packing and reinforcement helical coated manufacture in the 4th step, wherein reinforcement by stiffener, the plastic layer that is coated on outside stiffener constitutes, gasket for packing is constituted gasket for packing group with two for one group, gasket for packing group and reinforcement are alternately distributed outside inner sheath, and gasket for packing group is all close to inner sheath with reinforcement；The material of stiffener is steel wire or fiberglass reinforced plastics or aramid yarn；The material of plastic layer is polypropylene or linear low density polyethylene or Low Density Polyethylene or high density polyethylene (HDPE)；The diameter of gasket for packing is equal with the diameter of reinforcement；

6th step：The step manufacturing oversheath：By oversheath extruding machine, high density polyethylene (HDPE) or medium density polyethylene extrusion molding are coated on outside the armor that the 5th step is formed, form oversheath；

7th step：The step manufacturing oversheath protective layer：Take polyamide and its extrusion molding is coated on outside the oversheath manufacture in the 6th step, form seabed high tension cable finished product, the thickness of described oversheath protective layer is 1.0～2.0mm.

Seabed high tension cable in embodiment 3 of the present invention, it by the following method step be fabricated by：

The first step：The step manufacturing conductive unit：Many copper wires or aluminium wire or many copper wires are first taken to carry out stranded, the conductor of sectional area needed for formation with multiple aluminium wire；Take organosilane crosslinked polyethylene or by weight again, be made up of following raw material：High density polyethylene (HDPE)：70～85 parts, ethylene-vinyl acetate copolymer：10～20 parts, ethylene-tetrafluoroethylene copolymer：8～16 parts, magnesium hydroxide：10～15 parts, antioxidant 1010：3～5 parts, strontium titanates：2～4 parts, calcium titanate：2～4 parts, bismuth titanates：2～4 parts, magnesium titanate：2～4 parts, silicon dioxide：3～5 parts, zirconium dioxide：3～5 parts；Put in insulating barrier extruding machine, in the outer plastic extruding insulated layer of conductor, so that the center of circle of conductor is coincided with the center of circle of insulating barrier, and the diameter of insulating barrier is 1.5～5 times of conductor diameter and thickness of insulating layer minima is 1.5mm；Then form insulation screen outside conductive plasticss extrusion molding being coated on insulating barrier；Then form conductor sheath outside high density polyethylene (HDPE) or medium density polyethylene or polrvinyl chloride or Low Density Polyethylene extrusion molding being coated on insulation screen；Above-mentioned steps repeatedly, until form three conductive units；

Second step：The step manufacturing metal screen layer：Take manufacture in the first step three conductive units two biphase circumscribedly stranded or be placed in parallel, conductive unit intertwist body；The mode that steel band or aluminium strip or copper strips are in the way of longitudinally coating or spiral is wrapped is taken to be close to coat outside the conductive unit intertwist body being formed in the first step again；When longitudinally coating, there is overlapping overlap joint, lap width is 2～5mm, lap-joint is bondd with PUR, the peel strength minima between lap-joint's steel band or between aluminium strip or between copper strips is 1.6N/mm；When spiral is wrapped, there is between spiral overlapping overlap joint in front and back, lap width is 1～3mm；

3rd step：The step forming water blocking layer and tack coat：Take that water blocking layer is waterstop or non-woven fabrics or polyester band or aluminium-plastic tape is longitudinally coated on outside the metal screen layer manufacturing in second step, form water blocking layer；Take polypropylene extrusion molding to be coated on outside water blocking layer and form tack coat；

4th step：The step manufacturing inner sheath：Take and form inner sheath outside the tack coat that polyethylene or polrvinyl chloride extrusion molding cladding manufacture in the third step；

5th step：The step manufacturing armor：Take outside the inner sheath that pre-manufactured gasket for packing and reinforcement helical coated manufacture in the 4th step, wherein reinforcement by stiffener, the plastic layer that is coated on outside stiffener constitutes, gasket for packing and reinforcement are alternately distributed outside inner sheath, and gasket for packing is all close to inner sheath with reinforcement；The material of stiffener is steel wire or fiberglass reinforced plastics or aramid yarn；The material of plastic layer is polypropylene or linear low density polyethylene or Low Density Polyethylene or high density polyethylene (HDPE)；The diameter of gasket for packing is equal with the diameter of reinforcement；

6th step：The step manufacturing oversheath：By oversheath extruding machine, high density polyethylene (HDPE) or medium density polyethylene extrusion molding are coated on outside the armor that the 5th step is formed, form oversheath；Complete the manufacture of seabed high tension cable finished product.

Seabed high tension cable in embodiment 4 of the present invention, it by the following method step be fabricated by：

The first step：The step manufacturing conductive unit：Many copper wires or aluminium wire or many copper wires are first taken to carry out stranded, the conductor of sectional area needed for formation with multiple aluminium wire；Take organosilane crosslinked polyethylene or by weight again, be made up of following raw material：High density polyethylene (HDPE)：70～85 parts, ethylene-vinyl acetate copolymer：10～20 parts, ethylene-tetrafluoroethylene copolymer：8～16 parts, magnesium hydroxide：10～15 parts, antioxidant 1010：3～5 parts, strontium titanates：2～4 parts, calcium titanate：2～4 parts, bismuth titanates：2～4 parts, magnesium titanate：2～4 parts, silicon dioxide：3～5 parts, zirconium dioxide：3～5 parts；Put in insulating barrier extruding machine, in the outer plastic extruding insulated layer of conductor, so that the center of circle of conductor is coincided with the center of circle of insulating barrier, and the diameter of insulating barrier is 1.5～5 times of conductor diameter and thickness of insulating layer minima is 1.5mm；Then form insulation screen outside conductive plasticss extrusion molding being coated on insulating barrier；Then form conductor sheath outside high density polyethylene (HDPE) or medium density polyethylene or polrvinyl chloride or Low Density Polyethylene extrusion molding being coated on insulation screen；Above-mentioned steps repeatedly, until form three conductive units；

Second step：The step manufacturing metal screen layer：Take manufacture in the first step three conductive units two biphase circumscribedly stranded or be placed in parallel, conductive unit intertwist body；The mode that steel band or aluminium strip or copper strips are in the way of longitudinally coating or spiral is wrapped is taken to be close to coat outside the conductive unit intertwist body being formed in the first step again；When longitudinally coating, there is overlapping overlap joint, lap width is 2～5mm, lap-joint is bondd with PUR, the peel strength minima between lap-joint's steel band or between aluminium strip or between copper strips is 1.6N/mm；When spiral is wrapped, there is between spiral overlapping overlap joint in front and back, lap width is 1～3mm；

3rd step：The step forming water blocking layer and tack coat：Take that water blocking layer is waterstop or non-woven fabrics or polyester band or aluminium-plastic tape is longitudinally coated on outside the metal screen layer manufacturing in second step, form water blocking layer；Take polypropylene extrusion molding to be coated on outside water blocking layer and form tack coat；

4th step：The step manufacturing inner sheath：Take and form inner sheath outside the tack coat that polyethylene or polrvinyl chloride extrusion molding cladding manufacture in the third step；

5th step：The step manufacturing armor：Take outside the inner sheath that pre-manufactured gasket for packing and reinforcement helical coated manufacture in the 4th step, wherein reinforcement by stiffener, the plastic layer that is coated on outside stiffener constitutes, gasket for packing is constituted gasket for packing group with two for one group, gasket for packing group and reinforcement are alternately distributed outside inner sheath, and gasket for packing group is all close to inner sheath with reinforcement；The material of stiffener is steel wire or fiberglass reinforced plastics or aramid yarn；The material of plastic layer is polypropylene or linear low density polyethylene or Low Density Polyethylene or high density polyethylene (HDPE)；The diameter of gasket for packing is equal with the diameter of reinforcement；

6th step：The step manufacturing oversheath：By oversheath extruding machine, high density polyethylene (HDPE) or medium density polyethylene extrusion molding are coated on outside the armor that the 5th step is formed, form oversheath；Complete the manufacture of seabed high tension cable finished product.

In the present invention, due to reinforcement by stiffener, the plastic layer that is coated on outside stiffener constitutes, therefore, the size of stiffener can carry out appropriate design according to mechanical property requirements, and its outside plastic layer achieves tangent, rounding technology, i.e. armor amount of redundancy can be transferred to properly, and cooperation gasket for packing can be ordered and so that resource is more saved.

In the present invention, oversheath and presumable oversheath protective layer, make product be provided with the anti-wear performance more excellent than prior art, water-impervious, anti-sea water performance.

In the present invention, screen layer is different with of the prior art from the set-up mode of insulating barrier, and in prior art, screen layer is close to conductor, the effect of shielding actually difficult to realize；Therefore, so that the shielding propertiess of cable is substantially improved in the present invention, not only achieve the exclusion of external disturbance, considerably reduce the external impact of conductor itself radiation simultaneously.

In the present invention, due to employing special insulating layer material, and its suitable thickness proportion and concentricity, the insulating properties making cable greatly increase, and through test, the present invention is used for the electric power of transmission 500～1000KV, 1000 meters, 30,000 hours, any punch-through is not had to occur.

Through applicant's repeated tests, find that the optimization formula of insulating barrier is：Insulating layer material by weight, is made up of following raw material：High density polyethylene (HDPE)：80 parts, ethylene-vinyl acetate copolymer：15 parts, ethylene-tetrafluoroethylene copolymer：12 parts, magnesium hydroxide：13 parts, antioxidant 1010：4 parts, strontium titanates：3 parts, calcium titanate：3 parts, bismuth titanates：3 parts, magnesium titanate：3 parts, silicon dioxide：4 parts, zirconium dioxide：4 parts.

In the application, through test, its major parameter is as follows for insulating barrier：Melt flows mass rate：≤1.8g/10min；Density≤1.06g/cm³；Tensile strength >=21MPa；Break-draw strain >=550%；Resisting environmental stress and cracking F₀/h≥130h；Dielectric strength >=75kV/mm；Specific insulation >=5 × 10¹⁵ρ_v/Ω·m；Dielectric strength ε_r≤2.8.

, through test, its major parameter is as follows for optimization formula：Melt flows mass rate：1.5g/10min；Density≤1.01g/cm³；Tensile strength：25MPa；Break-draw strain：580%；Resisting environmental stress and cracking F₀/h：160h；Dielectric strength：82kV/mm；Specific insulation：5.9×10¹⁵ρ_v/Ω·m；Dielectric strength ε_r：2.6.

Above-mentioned parameter ensure that it has excellent insulating properties and extrusion processing performance, enables the cable of the present invention to transmit the electric power of 500～1000KV.

The cable making method of the present invention is simple, easily grasp, can be produced using the production equipment that cable production firm commonly uses, therefore, equipment investment is few, more economically practical, makes utilization rate of equipment and installations higher.

Therefore, the present invention has following main beneficial effect：Cable machinery performance redundancy amount is more suitable, resource is more saved, more resistant performance, more can water-impervious, more anti-sea water, shielding propertiess more preferably, more can transmit high voltage.

The present invention is not limited to above-mentioned preferred forms it will be appreciated that the design of the present invention can be implemented to use by other various forms, and they also fall within protection scope of the present invention.

Claims (10)

1. seabed high tension cable is it is characterised in that it is to be made up of the conductive unit setting gradually from inside to outside, metal screen layer, water blocking layer, inner sheath, armor, oversheath, oversheath protective layer；Described conductive unit be coated on outside conductor by conductor, extrusion molding insulating barrier, be located at insulation screen outside insulating barrier, the conductor sheath outside extrusion molding is coated on insulation screen is constituted, on arbitrary cross section, the center of circle of conductor is coincided with the center of circle of insulating barrier, and the diameter of insulating barrier is 1.5～5 times of conductor diameter and thickness of insulating layer minima is 1.5mm；Described armor is made up of gasket for packing, reinforcement, reinforcement is by stiffener, the plastic layer that is coated on outside stiffener is constituted, gasket for packing is constituted gasket for packing group with three for one group, reinforcement is constituted reinforcement group with three for one group, gasket for packing group and reinforcement group are alternately distributed outside inner sheath, and gasket for packing group is all close to inner sheath with reinforcement group；The material of described oversheath protective layer is polyamide；Described insulating barrier by weight, is made up of following raw material：High density polyethylene (HDPE)：70～85 parts, ethylene-vinyl acetate copolymer：10～20 parts, ethylene-tetrafluoroethylene copolymer：8～16 parts, magnesium hydroxide：10～15 parts, antioxidant 1010：3～5 parts, strontium titanates：2～4 parts, calcium titanate：2～4 parts, bismuth titanates：2～4 parts, magnesium titanate：2～4 parts, silicon dioxide：3～5 parts, zirconium dioxide：3～5 parts.

2. seabed according to claim 1 high tension cable is it is characterised in that described water blocking layer is waterstop or non-woven fabrics or polyester band or aluminium-plastic tape.

3. the seabed high tension cable according to claim 1 or claim 2 is it is characterised in that described insulation screen is conductive plasticss.

4. seabed according to claim 3 high tension cable is it is characterised in that the material of described conductor sheath is high density polyethylene (HDPE) or medium density polyethylene or polrvinyl chloride or Low Density Polyethylene.

5. seabed according to claim 4 high tension cable is it is characterised in that the material of main part of described inner sheath is polyethylene or polrvinyl chloride.

6. seabed according to claim 5 high tension cable is it is characterised in that the material of described gasket for packing is polypropylene or Low Density Polyethylene.

7. seabed according to claim 6 high tension cable is it is characterised in that the material of described stiffener is steel wire or fiberglass reinforced plastics or aramid yarn.

8. seabed according to claim 7 high tension cable is it is characterised in that the material of described plastic layer is polypropylene or Low Density Polyethylene or high density polyethylene (HDPE).

9. seabed according to claim 8 high tension cable is it is characterised in that the material of described oversheath is high density polyethylene (HDPE) or medium density polyethylene.

10. the manufacture method of seabed high tension cable is it is characterised in that it comprises following methods step：

The first step：The step manufacturing conductive unit：Many copper wires or aluminium wire or many copper wires are first taken to carry out stranded, the conductor of sectional area needed for formation with multiple aluminium wire；Take the material by weight, being made up of following raw material again：High density polyethylene (HDPE)：70～85 parts, ethylene-vinyl acetate copolymer：10～20 parts, ethylene-tetrafluoroethylene copolymer：8～16 parts, magnesium hydroxide：10～15 parts, antioxidant 1010：3～5 parts, strontium titanates：2～4 parts, calcium titanate：2～4 parts, bismuth titanates：2～4 parts, magnesium titanate：2～4 parts, silicon dioxide：3～5 parts, zirconium dioxide：3～5 parts；Put in insulating barrier extruding machine, in the outer plastic extruding insulated layer of conductor, so that the center of circle of conductor is coincided with the center of circle of insulating barrier, and the diameter of insulating barrier is 1.5～5 times of conductor diameter and thickness of insulating layer minima is 1.5mm；Then form insulation screen outside conductive plasticss extrusion molding being coated on insulating barrier；Then form conductor sheath outside high density polyethylene (HDPE) or medium density polyethylene or polrvinyl chloride or Low Density Polyethylene extrusion molding being coated on insulation screen；

Second step：The step manufacturing metal screen layer：The mode that steel band or aluminium strip or copper strips are in the way of longitudinally coating or spiral is wrapped is taken to coat outside the conductive unit being formed in the first step；When longitudinally coating, there is overlapping overlap joint, lap width is 2～5mm, lap-joint is bondd with PUR, the peel strength minima between lap-joint's steel band or between aluminium strip or between copper strips is 1.6N/mm；When spiral is wrapped, there is between spiral overlapping overlap joint in front and back, lap width is 1～3mm；

3rd step：The step forming water blocking layer and tack coat：Take that water blocking layer is waterstop or non-woven fabrics or polyester band or aluminium-plastic tape is longitudinally coated on outside the metal screen layer manufacturing in second step, form water blocking layer；Take polypropylene extrusion molding to be coated on outside water blocking layer and form tack coat；

4th step：The step manufacturing inner sheath：Take and form inner sheath outside the tack coat that polyethylene or polrvinyl chloride extrusion molding cladding manufacture in the third step；

5th step：The step manufacturing armor：Take outside the inner sheath that pre-manufactured gasket for packing and reinforcement helical coated manufacture in the 4th step, wherein reinforcement by stiffener, the plastic layer that is coated on outside stiffener constitutes, gasket for packing is constituted gasket for packing group with three for one group, reinforcement is constituted reinforcement group with three for one group, gasket for packing group and reinforcement group are alternately distributed outside inner sheath, and gasket for packing group is all close to inner sheath with reinforcement group；The material of stiffener is steel wire or fiberglass reinforced plastics or aramid yarn；The material of plastic layer is polypropylene or Low Density Polyethylene or high density polyethylene (HDPE)；The diameter of gasket for packing is equal with the diameter of reinforcement；

6th step：The step manufacturing oversheath：By oversheath extruding machine, high density polyethylene (HDPE) or medium density polyethylene extrusion molding are coated on outside the armor that the 5th step is formed, form oversheath；

7th step：The step manufacturing oversheath protective layer：Take polyamide and its extrusion molding is coated on outside the oversheath manufacture in the 6th step, form seabed high tension cable finished product, the thickness of described oversheath protective layer is 1.0～2.0mm.